flodl 0.7.0

floDl — a flow-graph deep learning framework built on libtorch
Documentation 
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>floDl Training Dashboard</title>
<style>
*{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#0f1117;--card:#1a1d27;--border:#2a2d3a;--text:#e4e6eb;--dim:#8b8fa3;
--accent:#6c8cff;--green:#34d399;--red:#f87171;--yellow:#fbbf24;--purple:#a78bfa;
--cyan:#67e8f9;
/* Tooltip and the SVG card's paper both need to flip with the theme; they were
   the only two places assuming a dark page. */
--tooltip-bg:rgba(26,29,39,0.95);--paper:#fff}
/* Light theme. Values lifted verbatim from flodl.dev
   (`site/assets/css/style.css`), which already declares this palette under the
   same variable names — so the dashboard and the site stay one product rather
   than two takes on a similar idea. */
:root[data-theme="light"]{--bg:#fbfbfc;--card:#ffffff;--border:#dde0e8;
--text:#1a1d27;--dim:#5a5f72;--accent:#3656c7;--green:#0e9968;--red:#c93c3c;
--yellow:#8f5b10;--purple:#6e4ad0;--cyan:#0b7b95;
--tooltip-bg:rgba(26,29,39,0.95);--paper:#fbfbfc}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
background:var(--bg);color:var(--text);padding:0;min-height:100vh}

/* Header */
.header{background:var(--card);border-bottom:1px solid var(--border);padding:16px 24px;
display:flex;flex-direction:column;gap:8px}
.header-row{display:flex;align-items:center;gap:24px;flex-wrap:wrap}
.header h1{font-size:18px;font-weight:600;color:var(--accent);letter-spacing:-0.5px}
.header h1 span{color:var(--dim);font-weight:400}
.hw-info{color:var(--dim);font-size:11px;letter-spacing:0.3px;font-family:monospace}
.stat{display:flex;flex-direction:column;gap:2px}
.stat-label{font-size:10px;text-transform:uppercase;letter-spacing:0.5px;color:var(--dim)}
.stat-value{font-size:16px;font-weight:600;font-variant-numeric:tabular-nums}
.progress-bar{flex:1;min-width:120px;max-width:300px;height:6px;background:var(--border);
border-radius:3px;overflow:hidden}
.progress-fill{height:100%;background:var(--accent);border-radius:3px;transition:width 0.3s}

/* Breadcrumb navigation — one bar for every level, replacing per-device tabs */
.crumbs{background:var(--card);border-bottom:1px solid var(--border);padding:9px 24px;
display:flex;align-items:center;gap:6px;overflow-x:auto;white-space:nowrap;font-size:12px}
.crumb{color:var(--accent);cursor:pointer;padding:3px 8px;border-radius:4px;
transition:background 0.15s;user-select:none}
.crumb:hover{background:rgba(108,140,255,0.12)}
.crumb.here{color:var(--text);font-weight:600;cursor:default}
.crumb.here:hover{background:none}
.crumb-sep{color:var(--dim);opacity:0.6}
.crumb-note{color:var(--dim);margin-left:8px;font-size:11px;font-family:monospace}
.crumb-badge{margin-left:auto;font-size:11px;padding:3px 9px;border-radius:10px;
background:rgba(248,113,113,0.15);color:var(--red);cursor:pointer;display:none}
.crumb-badge.warn{background:rgba(251,191,36,0.15);color:var(--yellow)}
.crumb-badge.on{display:inline-block}
/* Immediate children, one click below the breadcrumb. The children CARD
   compares them; this is the navigation twin — drilling down should not
   require scrolling to a chart first. Hidden at a leaf. */
.kidbar{background:var(--card);border-bottom:1px solid var(--border);
        padding:7px 24px;display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.kidbar-label{color:var(--dim);font-size:11px;text-transform:uppercase;
              letter-spacing:0.5px;margin-right:2px}
.kid{color:var(--accent);cursor:pointer;padding:3px 9px;border-radius:4px;
     font-size:12px;border:1px solid var(--border)}
.kid:hover{background:rgba(108,140,255,0.12)}
.kid.lost{color:var(--dim);text-decoration:line-through}
.kid-note{color:var(--dim);font-size:11px;margin-left:3px}

/* Layout */
.grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;padding:16px 24px}
@media(max-width:900px){.grid{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:16px;overflow:hidden}
.card h2{font-size:13px;text-transform:uppercase;letter-spacing:0.5px;color:var(--dim);margin-bottom:12px;
display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.card h2 .sub{text-transform:none;letter-spacing:0;font-weight:400;opacity:0.8}
.full-width{grid-column:1/-1}
select{background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:4px;
font-size:11px;padding:2px 6px;font-family:inherit}

/* Charts */
canvas{width:100%;height:260px;cursor:crosshair}
.legend{display:flex;flex-wrap:wrap;gap:10px;margin-top:10px}
.legend-item{display:flex;align-items:center;gap:5px;font-size:11px;color:var(--dim);cursor:pointer;
user-select:none;padding:2px 6px;border-radius:4px;transition:opacity 0.2s,background 0.15s}
.legend-item:hover{background:rgba(108,140,255,0.1)}
.legend-item.dimmed{opacity:0.3}
.legend-item.solo{background:rgba(108,140,255,0.15)}
.legend-dot{width:8px;height:8px;border-radius:50%}
.empty{color:var(--dim);font-size:12px;padding:24px 0;text-align:center}

/* Resource bars */
.res-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px}
.res-item{display:flex;flex-direction:column;gap:4px}
.res-label{display:flex;justify-content:space-between;font-size:11px;color:var(--dim);gap:8px}
.res-bar{height:8px;background:var(--border);border-radius:4px;overflow:hidden}
.res-fill{height:100%;border-radius:4px;transition:width 0.5s}
.res-fill.cpu{background:var(--accent)}
.res-fill.ram{background:var(--purple)}
.res-fill.gpu{background:var(--green)}
.res-fill.vram{background:var(--yellow)}

/* Tables (children / log / alerts) */
.scroll-wrap{max-height:300px;overflow:auto;scrollbar-width:thin;scrollbar-color:var(--border) transparent}
.scroll-wrap::-webkit-scrollbar{width:6px;height:6px}
.scroll-wrap::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
table{width:100%;border-collapse:collapse;font-size:12px;font-variant-numeric:tabular-nums}
th{text-align:left;color:var(--dim);font-weight:500;padding:6px 8px;white-space:nowrap;
border-bottom:1px solid var(--border);position:sticky;top:0;background:var(--card);z-index:1}
td{padding:5px 8px;border-bottom:1px solid var(--border);white-space:nowrap}
tr:hover td{background:rgba(108,140,255,0.05)}
tr.drill{cursor:pointer}
tr.drill:hover td{background:rgba(108,140,255,0.12)}
tr.epoch-row td{border-left:2px solid var(--accent)}
tr.epoch-row td:first-child{font-weight:600}
tr.dead td{color:var(--red)}
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.sev-info{color:var(--dim)}
.res-cell{color:var(--dim);font-size:11px}

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:root[data-theme="light"] .theme-toggle .moon{display:inline-block}

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.svg-toggle .arrow{transition:transform 0.2s;font-size:10px}
.svg-toggle.open .arrow{transform:rotate(90deg)}
.svg-container{max-height:0;overflow:hidden;transition:max-height 0.3s ease;background:var(--paper);border-radius:6px;margin-top:8px}
/* A deep model's graph is a tall, narrow ribbon (ResNet-56 renders ~272pt
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<body>

<div class="header">
  <div class="header-row">
    <h1>floDl <span>Training Dashboard</span></h1>
    <div class="status" id="status">
      <div class="status-dot" id="statusDot"></div>
      <span id="statusText">Waiting...</span>
    </div>
    <div class="stat">
      <div class="stat-label">Epoch</div>
      <div class="stat-value" id="epochNum">&mdash;</div>
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    <div class="progress-bar"><div class="progress-fill" id="progressFill"></div></div>
    <div class="stat">
      <div class="stat-label">ETA</div>
      <div class="stat-value" id="etaDisplay">&mdash;</div>
    </div>
    <div class="stat">
      <div class="stat-label">Elapsed</div>
      <div class="stat-value" id="elapsedDisplay">&mdash;</div>
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  <div class="hw-info" id="hwInfo" style="display:none"></div>
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<div class="crumbs" id="crumbs">
  <span class="crumb here">root</span>
  <span class="crumb-badge" id="alertBadge" onclick="scrollToAlerts()"></span>
</div>

<div class="kidbar" id="kidbar" style="display:none"></div>

<div class="grid">
  <div class="card">
    <h2>Metrics <span class="sub" id="metricsScope"></span></h2>
    <canvas id="metricsChart"></canvas>
    <div class="legend" id="metricsLegend"></div>
  </div>

  <div class="card">
    <h2>Resources <span class="sub" id="resourceScope"></span></h2>
    <canvas id="resourceChart"></canvas>
    <div class="legend" id="resourceLegend"></div>
    <div class="res-grid" id="resGrid">
      <div class="res-item"><div class="res-label"><span id="cpuLabel">CPU</span><span id="cpuVal">&mdash;</span></div>
        <div class="res-bar"><div class="res-fill cpu" id="cpuBar" style="width:0"></div></div></div>
      <div class="res-item"><div class="res-label"><span id="ramLabel">RAM</span><span id="ramVal">&mdash;</span></div>
        <div class="res-bar"><div class="res-fill ram" id="ramBar" style="width:0"></div></div></div>
      <div class="res-item"><div class="res-label"><span>GPU</span><span id="gpuVal">&mdash;</span></div>
        <div class="res-bar"><div class="res-fill gpu" id="gpuBar" style="width:0"></div></div></div>
      <div class="res-item"><div class="res-label"><span>VRAM</span><span id="vramVal">&mdash;</span></div>
        <div class="res-bar"><div class="res-fill vram" id="vramBar" style="width:0"></div></div></div>
    </div>
  </div>

  <div class="card full-width" id="childrenCard" style="display:none">
    <h2>Children <span class="sub" id="childrenCount"></span>
      <span class="sub">compare</span> <select id="compareMetric" onchange="onCompareChange()"></select></h2>
    <div class="sub" id="childrenNote" style="display:none;margin-bottom:8px"></div>
    <canvas id="childrenChart"></canvas>
    <div class="legend" id="childrenLegend"></div>
    <div class="scroll-wrap" style="margin-top:12px">
      <table>
        <thead><tr id="childrenHeader"></tr></thead>
        <tbody id="childrenBody"></tbody>
      </table>
    </div>
  </div>

  <div class="card full-width">
    <h2>Log <span class="sub" id="logScope"></span></h2>
    <div class="scroll-wrap">
      <table>
        <thead><tr id="logHeader"></tr></thead>
        <tbody id="logBody"></tbody>
      </table>
    </div>
    <div class="empty" id="logEmpty">waiting for the first record...</div>
  </div>

  <div class="card full-width" id="alertsCard" style="display:none">
    <h2>Alerts <span class="sub">whole run, deepest origin path</span></h2>
    <div class="scroll-wrap">
      <table>
        <thead><tr><th>When</th><th>Class</th><th>Origin</th><th>Detail</th><th>Count</th></tr></thead>
        <tbody id="alertsBody"></tbody>
      </table>
    </div>
  </div>

  <div class="card full-width" id="metaCard" style="display:none">
    <details>
      <summary style="cursor:pointer;color:var(--dim);font-size:13px;text-transform:uppercase;letter-spacing:0.5px">Training Configuration</summary>
      <pre id="metaPre" style="margin-top:12px;color:var(--text);font-size:12px;white-space:pre-wrap;word-break:break-word"></pre>
    </details>
  </div>

  <div class="card full-width" id="svgCard" style="display:none">
    <div class="svg-toggle" id="svgToggle" onclick="toggleSvg()">
      <span class="arrow">&#9654;</span>
      <h2 style="margin:0">Graph Architecture</h2>
    </div>
    <div class="svg-container" id="svgContainer"></div>
  </div>
</div>

<div class="tooltip" id="tooltip"></div>

<script>
// ===========================================================================
// floDl monitoring portal
//
// One recursive view over the record stream: every level renders the same way
// (its own metrics + resources plotted, its children compared and drillable,
// its log listing epoch and sub-epoch rows interleaved). Navigation is the
// record `path` — a breadcrumb, not per-device tabs.
//
// Three data owners, no overlap:
//   * `/events`  — the run clock: epoch/total, ETA, elapsed, completion, and
//                  host CPU/RAM (per-host facts that are deliberately not in
//                  the record tree, so they show as gauges only).
//   * `/stream?path=` + `/history?path=` — every level's rows, children and
//                  alerts. The record plane exists in cluster runs.
//   * `/events` again, as a FALLBACK level source when no record plane exists
//                  (single-process runs, and the baked HTML archive): each
//                  epoch becomes a root row, and `gpus[]` becomes one child
//                  per device, so the same renderer covers both.
// ===========================================================================

// Series palettes. The dark ramp ends in pale tints that wash out on white, so
// light gets its own — anchored on flodl.dev's light accents and darkened rather
// than inverted. Twelve either way, same order, so a series keeps its position.
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/// Chart-drawing colours cannot be `var(--…)` — canvas has no CSS cascade. Read
/// them once per render (never per stroke) and let the CSS stay the single
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// `gpu peak` shares the gpu hue at lower saturation: it is the same quantity
// seen a different way (interval max vs interval mean), so it should read as a
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const RES_COLORS={cpu:'#6c8cff',ram:'#a78bfa',gpu:'#34d399',vram:'#fbbf24',
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// Rows retained per node. Bounds the DOM and the chart point count on a long
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// says how many of how many are shown.
const MAX_LOG_ROWS=500;
const HISTORY_N=2048;

// --- Store -----------------------------------------------------------------
// path -> node. Rows are the interleaved cadences (window reports + epoch
// boundaries) in `t` order; `metricKeys` is the union seen at this path.
const NODES=new Map();
// Alert stream, newest first, collapsed per (class, path).
const ALERTS=new Map();
// Wall-clock origin (ms) for the record axis; `null` until the first record.
let T0=null;
// Latches true on the first `node` record — from then on the record plane owns
// every level and the `/events` fallback tree is dropped (different clock).
let recordMode=false;
let META=null;
// Host resources from `/events`: last values only (see the header comment).
let HOST={cpu:null,ram_used:null,ram_total:null,gpu:null,vram_alloc:null,vram_total:null};
// Cumulative epoch time, the `/events` fallback axis (epoch JSON has no `ts`),
// and the epochs already folded into it. `/events` replays its whole history on
// every connect, and EventSource reconnects on its own after any drop — so the
// epoch number, not the running clock, is what makes a row unique.
let legacyT=0;
const legacySeen=new Set();
// Device identity pushed before the first epoch (LIVE_GPU_INIT): dev -> {name, vram_total}.
const GPU_INIT=new Map();

let current=ROOT;
let levelSse=null;
// Set when the current level's stream or history fetch could not be reached,
// so an empty children view can distinguish "not loaded" from "no children".
let levelUnreachable=false;
let rootSse=null;
let compareKey=null;
const soloState={metricsChart:null,resourceChart:null,childrenChart:null};
let startTime=null;
let elapsedTimer=null;
let renderQueued=false;

// How a metric key rolls up over a node's direct children. Mirrors
// `record::core_reduction`; anything else is a user metric, whose declared
// reduction rides the `meta` record (default mean). Shown in an interior
// level's legend, where a metric IS a roll-up — never at a leaf, where it is
// a raw measurement.
const CORE_REDUCTION={throughput:'sum',batch_share:'sum',loss:'mean',
                      data_starve:'max',compute_only_ms:'max'};
function reductionOf(key){
  if(CORE_REDUCTION[key])return CORE_REDUCTION[key];
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  return 'mean';
}

function parentOf(path){
  const i=path.lastIndexOf('/');
  return i<0?null:path.slice(0,i);
}
/// Numeric-aware compare, so `rank2` sorts before `rank10` in every legend and
/// table (plain lexicographic order scrambles a double-digit cohort).
function natCmp(a,b){
  const re=/(\d+)|(\D+)/g;
  const as=String(a).match(re)||[],bs=String(b).match(re)||[];
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    else if(x!==y)return x<y?-1:1;
  }
  return as.length-bs.length;
}
function lastSeg(path){
  const i=path.lastIndexOf('/');
  return i<0?path:path.slice(i+1);
}
function nodeOf(path){
  let n=NODES.get(path);
  if(n)return n;
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     children:new Set(),label:null,device:null,alive:null,isLeaf:null,lastRow:null};
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  // Creating a node creates its ancestors, so a deep `/history` fetch still
  // yields a walkable breadcrumb even if no ancestor record arrived yet.
  const p=parentOf(path);
  if(p)nodeOf(p).children.add(path);
  return n;
}

/// Insert one row, ignoring a repeat. Duplicates are expected by design: the
/// server registers a `/stream` subscriber BEFORE replaying its preamble (a
/// lost record is unrecoverable, a duplicated one is not, since every node
/// record is an absolute snapshot) and the root subscription overlaps the
/// level one. Absolute snapshots are idempotent, but APPENDING one twice
/// would double-plot — so the identity check lives here.
function addRow(path,row){
  const n=nodeOf(path);
  const key=row.ts+'|'+row.tick+'|'+row.epoch1+'|'+(row.ec?1:0);
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  row.key=key;
  n.keys.add(key);
  // Binary insert by `t`: a level's history preamble arrives after the live
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  let lo=0,hi=n.rows.length;
  while(lo<hi){const mid=(lo+hi)>>1;if(n.rows[mid].t<=row.t)lo=mid+1;else hi=mid}
  n.rows.splice(lo,0,row);
  while(n.rows.length>MAX_ROWS){const drop=n.rows.shift();n.keys.delete(drop.key)}
  for(const k in row.metrics)n.metricKeys.add(k);
  for(const k in row.res)n.resKeys.add(k);
  if(!n.lastRow||row.t>=n.lastRow.t)n.lastRow=row;
  return true;
}

// --- Ingest: record plane --------------------------------------------------
function ingestRecord(rec){
  if(!rec||typeof rec!=='object')return;
  if(rec.kind==='meta'){META=rec;return}
  if(rec.kind==='event'){ingestAlert(rec);return}
  if(rec.kind!=='node')return;
  if(!recordMode)latchRecordMode();
  if(T0===null)T0=rec.ts||0;
  const n=nodeOf(rec.path);
  // Node identity is last-known-wins: `label` rides the epoch record only, so
  // a window report must not blank it.
  if(rec.label!=null)n.label=rec.label;
  if(rec.device!=null)n.device=rec.device;
  // A leaf carries `alive` as a bool; an interior node as a live-child count.
  if(typeof rec.alive==='boolean'){n.isLeaf=true;n.alive=rec.alive}
  else if(rec.alive!=null){n.isLeaf=false;n.aliveCount=rec.alive;n.childCount=rec.children}
  addRow(rec.path,{
    t:((rec.ts||0)-T0)/1000,
    ts:rec.ts||0,
    epoch1:rec.epoch!=null?rec.epoch+1:null,   // records carry a 0-based epoch
    tick:rec.tick!=null?rec.tick:null,
    ec:rec.epoch_complete===true,
    metrics:rec.metrics||{},
    res:rec.res||{},
    work:rec.work!=null?rec.work:null,
  });
  scheduleRender();
}

/// Drop the `/events` fallback tree on the first record. The two sources put
/// rows on different clocks (cumulative epoch duration vs the producer's
/// wall-clock `ts`), so keeping both would plot one series against two axes.
/// Nothing is lost: the level's `/history` preamble re-supplies the past.
function latchRecordMode(){
  recordMode=true;
  NODES.clear();
  T0=null;
  const wasDeep=current!==ROOT;
  current=ROOT;
  if(levelSse){levelSse.close();levelSse=null}
  // A fallback-tree path (`root/gpu0`) does not exist in the record tree, so
  // send the viewer back to root rather than leaving them on a dead level.
  if(wasDeep)location.hash='#path='+encodeURIComponent(ROOT);
}

/// Alerts collapse per (class, path). Stream `count` is an INCREMENT (the
/// occurrences the record represents), so the running total is their sum.
function ingestAlert(rec){
  const key=rec.class+'|'+rec.path;
  const cur=ALERTS.get(key);
  const add=rec.count!=null?rec.count:1;
  if(cur&&cur.ts>=rec.ts){cur.total+=add}
  else ALERTS.set(key,{class:rec.class,path:rec.path,sev:rec.sev,detail:rec.detail,
                       ts:rec.ts,total:(cur?cur.total:0)+add});
  scheduleRender();
}

// --- Ingest: `/events` epoch feed -----------------------------------------
function ingestEpoch(d){
  updateHeader(d);
  const r=d.resources||{};
  HOST={cpu:r.cpu!=null?r.cpu:null,
        ram_used:r.ram_used!=null?r.ram_used:null,
        ram_total:r.ram_total!=null?r.ram_total:null,
        gpu:r.gpu!=null?r.gpu:null,
        vram_alloc:r.vram_alloc!=null?r.vram_alloc:null,
        vram_total:r.vram_total!=null?r.vram_total:null};
  for(const g of d.gpus||[]){
    if(g.dev==null)continue;
    const cur=GPU_INIT.get(g.dev)||{};
    GPU_INIT.set(g.dev,{name:g.name||cur.name,vram_total:g.vram_total!=null?g.vram_total:cur.vram_total});
  }
  // The record plane owns the levels once it exists; this feed stays the run
  // clock and the host gauges, and contributes no rows (they would duplicate
  // the epoch records at the same paths).
  if(!recordMode)ingestEpochAsLevels(d,r);
  scheduleRender();
}

/// Fallback tree for a run with no record plane: the epoch becomes a root row,
/// and `gpus[]` becomes one child per device. Mirrors the record plane's own
/// tiering rule — a lone device collapses into root rather than adding a level
/// that repeats it.
function ingestEpochAsLevels(d,r){
  // A replayed epoch is already on the axis; re-adding it would both duplicate
  // the row and push every later epoch further along a clock that only ever
  // grows. The header still tracks the replay (it is absolute, not cumulative).
  if(legacySeen.has(d.epoch))return;
  legacySeen.add(d.epoch);
  legacyT+=d.duration||0;
  const gpus=d.gpus||[];
  const tiered=gpus.length>=2;
  const rootRes={};
  if(r.cpu!=null)rootRes.cpu=r.cpu;
  if(r.ram_used!=null)rootRes.ram_used=r.ram_used;
  if(r.ram_total!=null)rootRes.ram_total=r.ram_total;
  if(r.gpu!=null)rootRes.gpu_util=r.gpu;
  if(r.vram_alloc!=null)rootRes.vram_alloc=r.vram_alloc;
  if(r.vram_total!=null)rootRes.vram_total=r.vram_total;
  addRow(ROOT,{t:legacyT,ts:Math.round(legacyT*1000),epoch1:d.epoch,tick:null,ec:true,
               metrics:cleanMetrics(d.metrics),res:rootRes,work:null});
  const rootNode=nodeOf(ROOT);
  if(!tiered)rootNode.isLeaf=gpus.length<=1;
  if(!tiered)return;
  rootNode.isLeaf=false;
  for(const g of gpus){
    if(g.dev==null)continue;
    // `gpu<dev>` names what the epoch feed actually reports: a GPU-shaped
    // entry at index `dev`. In a live single-process run that is a physical
    // device; in a cluster run's baked archive it is a rank (the feed rewrites
    // `dev` to the global rank and puts `host:lr=.. gr=..` in the name, which
    // then shows in the legend).
    const path=ROOT+'/gpu'+g.dev;
    const kid=nodeOf(path);
    kid.isLeaf=true;
    kid.alive=true;
    kid.device=g.dev;
    const init=GPU_INIT.get(g.dev)||{};
    if(init.name)kid.label=shortGpuName(init.name);
    const metrics={};
    if(g.throughput!=null)metrics.throughput=g.throughput;
    if(g.chunk!=null)metrics.batch_share=g.chunk;
    const res={};
    if(g.util!=null)res.gpu_util=g.util;
    if(g.vram_alloc!=null)res.vram_alloc=g.vram_alloc;
    const vt=g.vram_total!=null?g.vram_total:init.vram_total;
    if(vt!=null)res.vram_total=vt;
    addRow(path,{t:legacyT,ts:Math.round(legacyT*1000),epoch1:d.epoch,tick:null,ec:true,
                 metrics,res,work:null});
  }
}

/// `/events` writes `null` for a non-finite metric (absent != zero); drop the
/// key rather than carrying a null into a series.
function cleanMetrics(m){
  const out={};
  for(const k in m||{})if(m[k]!=null)out[k]=m[k];
  return out;
}

function markComplete(msg){
  document.getElementById('statusDot').classList.add('done');
  document.getElementById('statusText').textContent=msg||'Complete';
  if(elapsedTimer){clearInterval(elapsedTimer);elapsedTimer=null}
}

// --- Navigation ------------------------------------------------------------
function pathFromHash(){
  const h=(location.hash||'').replace(/^#/,'');
  if(!h)return ROOT;
  const m=/^path=(.*)$/.exec(h);
  return m?decodeURIComponent(m[1]):ROOT;
}
function navigate(path){
  // Route through the hash so a level is linkable and Back works.
  const target='#path='+encodeURIComponent(path);
  if(location.hash===target)setLevel(path);
  else location.hash=target;
}
function setLevel(path){
  current=path||ROOT;
  nodeOf(current);
  subscribeLevel(current);
  render();
}
window.addEventListener('hashchange',()=>setLevel(pathFromHash()));

function renderCrumbs(){
  const el=document.getElementById('crumbs');
  const badge=document.getElementById('alertBadge');
  const segs=current.split('/');
  let html='';
  for(let i=0;i<segs.length;i++){
    const p=segs.slice(0,i+1).join('/');
    const here=i===segs.length-1;
    if(i>0)html+='<span class="crumb-sep">/</span>';
    html+='<span class="crumb'+(here?' here':'')+'" data-path="'+esc(p)+'">'+esc(segs[i])+'</span>';
  }
  const n=NODES.get(current);
  const note=[];
  if(n&&n.label)note.push(n.label);
  if(n&&n.device!=null)note.push('dev '+n.device);
  if(n&&n.isLeaf===false&&n.childCount!=null)note.push(n.aliveCount+'/'+n.childCount+' alive');
  if(n&&n.isLeaf===true&&n.alive===false)note.push('LOST');
  if(note.length)html+='<span class="crumb-note">'+esc(note.join(' · '))+'</span>';
  el.innerHTML=html;
  el.appendChild(badge);
  el.querySelectorAll('.crumb:not(.here)').forEach(c=>{
    c.onclick=()=>navigate(c.dataset.path);
  });
  renderKidBar();
}

// Immediate children as navigation chips, directly under the breadcrumb.
// The children card already compares them and is clickable, but it sits below
// the charts — drilling down should not mean scrolling to a chart first. The
// breadcrumb walks UP, this walks DOWN, and together they make every adjacent
// level reachable without scrolling.
//
// Only LOADED children can be linked (a level is fetched when opened), so when
// the node declares more than arrived we say so rather than quietly showing a
// short list — the same absent≠zero honesty the children card uses.
function renderKidBar(){
  const bar=document.getElementById('kidbar');
  const node=NODES.get(current);
  const kids=node?childPaths(node):[];
  if(!kids.length){bar.style.display='none';bar.innerHTML='';return}
  let html='<span class="kidbar-label">in here</span>';
  for(const p of kids){
    const k=NODES.get(p);
    const lost=k&&k.isLeaf===true&&k.alive===false;
    const seg=p.split('/').pop();
    html+='<span class="kid'+(lost?' lost':'')+'" data-path="'+esc(p)+'" title="'+esc(p)+'">'
        +esc(seg)+(k&&k.label?' <span class="kid-note">'+esc(k.label)+'</span>':'')+'</span>';
  }
  const declared=node.childCount;
  if(declared!=null&&declared>kids.length){
    html+='<span class="kid-note">'+(declared-kids.length)+' more not loaded</span>';
  }
  bar.innerHTML=html;
  bar.style.display='flex';
  bar.querySelectorAll('.kid').forEach(c=>{c.onclick=()=>navigate(c.dataset.path)});
}

// --- Subscriptions ---------------------------------------------------------
// Two record subscriptions, on purpose:
//   * `rootSse` is pinned for the whole session. `/stream` scopes NODE records
//     to the level and its direct children, but EVENT records to the whole
//     subtree — so a root subscription is the one place that sees every alert,
//     whatever level the viewer is on. It is also the alert lane's only
//     consumer: alert counts are increments and cannot be deduplicated by
//     identity, so exactly one subscription may feed them.
//   * `levelSse` follows navigation, and is skipped at root (already covered).
function subscribeRoot(){
  rootSse=new EventSource('/stream?path='+encodeURIComponent(ROOT));
  rootSse.addEventListener('record',e=>{try{ingestRecord(JSON.parse(e.data))}catch(err){}});
}
function subscribeLevel(path){
  if(levelSse){levelSse.close();levelSse=null}
  levelUnreachable=false;
  if(path===ROOT||!rootSse)return;
  const enc=encodeURIComponent(path);
  levelSse=new EventSource('/stream?path='+enc);
  levelSse.addEventListener('record',e=>{
    try{
      const rec=JSON.parse(e.data);
      // The pinned root subscription owns the alert lane.
      if(rec.kind!=='event')ingestRecord(rec);
    }catch(err){}
  });
  // A level's records are fetched when you open it, so once the run's server
  // is gone a level never visited while live has nothing to show. Remember
  // that the reach failed so the children view can say so rather than render
  // as an empty node (see `renderChildren`).
  levelSse.addEventListener('error',()=>{levelUnreachable=true;scheduleRender()});
  // Subscribe first, then backfill: the same duplicate-over-loss ordering the
  // server uses for its own preamble, and `addRow` absorbs the overlap.
  fetch('/history?path='+enc+'&n='+HISTORY_N)
    .then(r=>r.ok?r.json():[])
    .then(rows=>{for(const r of rows)if(r.kind!=='event')ingestRecord(r)})
    .catch(()=>{levelUnreachable=true;scheduleRender()});
}

// --- Header ----------------------------------------------------------------
function updateHeader(d){
  if(!startTime&&d.duration!=null)startTime=Date.now()-(d.epoch*d.duration*1000);
  document.getElementById('epochNum').textContent=d.epoch+'/'+d.total;
  document.getElementById('progressFill').style.width=(d.epoch/d.total*100)+'%';
  document.getElementById('statusDot').classList.remove('done');
  document.getElementById('statusText').textContent='Training';
  if(d.eta!=null)document.getElementById('etaDisplay').textContent=fmtDur(d.eta);
  updateElapsed();
}
function updateElapsed(){
  if(!startTime)return;
  document.getElementById('elapsedDisplay').textContent=fmtDur((Date.now()-startTime)/1000);
}

// --- Series helpers --------------------------------------------------------
function seriesOf(node,group,key){
  const out=[];
  for(const r of node.rows){const v=r[group][key];if(v!=null)out.push({t:r.t,v,row:r})}
  return out;
}
/// Percentage series from a used/total pair; absent either side means absent.
function pctSeries(node,usedKey,totalKey){
  const out=[];
  for(const r of node.rows){
    const u=r.res[usedKey],tt=r.res[totalKey];
    if(u!=null&&tt)out.push({t:r.t,v:u/tt*100,row:r});
  }
  return out;
}
function epochMarks(node){
  const out=[];
  for(const r of node.rows)if(r.ec&&r.epoch1!=null)out.push({t:r.t,label:'e'+r.epoch1});
  return out;
}
function metricKeys(node){
  return Array.from(node.metricKeys).sort();
}
function lastOf(series){
  return series.length?series[series.length-1].v:null;
}

// --- Render ----------------------------------------------------------------
function scheduleRender(){
  if(renderQueued)return;
  renderQueued=true;
  requestAnimationFrame(()=>{renderQueued=false;render()});
}
/// The level a card is describing. Shared because `drawMetrics` re-sets the
/// metrics one on its own (a legend click redraws that chart WITHOUT going
/// through `render`), and the two must not drift.
function scopeLabel(){return current===ROOT?'run total':lastSeg(current)}
function render(){
  renderCrumbs();
  const scope=scopeLabel();
  document.getElementById('metricsScope').textContent=scope;
  document.getElementById('resourceScope').textContent=scope;
  const total=nodeOf(current).rows.length;
  document.getElementById('logScope').textContent=
    (recordMode?'epoch + sub-epoch rows, newest first':'epoch rows, newest first')+
    (total>MAX_LOG_ROWS?' — showing newest '+MAX_LOG_ROWS+' of '+total:'');
  renderHardware();
  drawMetrics();
  drawResources();
  renderChildren();
  renderLog();
  renderAlerts();
  // Run-scoped cards describe the whole run, not a level.
  const atRoot=current===ROOT;
  for(const id of ['metaCard','svgCard']){
    const el=document.getElementById(id);
    if(el.dataset.have==='1')el.style.display=atRoot?'block':'none';
  }
}

function drawMetrics(){
  const node=nodeOf(current);
  const keys=metricKeys(node);
  const series={},labels={};
  // Level-aware legend: at an interior node every metric is a work-weighted
  // roll-up over the direct children, so the legend names the reduction. At a
  // leaf it is a raw measurement and the bare key is the honest label.
  const interior=node.isLeaf===false;
  for(const k of keys){
    series[k]=seriesOf(node,'metrics',k);
    labels[k]=interior?k+' ('+reductionOf(k)+')':k;
  }
  const solo=soloState.metricsChart;
  // The only chart with mixed units on one canvas — loss, throughput,
  // batch_share and compute_only_ms span five orders of magnitude, so a shared
  // axis shows the milliseconds and flattens everything else. Each curve gets
  // the full height instead; click one in the legend for its true axis.
  drawChart('metricsChart',series,COLORS,{
    marks:epochMarks(node),
    yFmt:solo?fmtForKey(solo):null,
    normalize:true,
    labels,
  });
  updateLegend('metricsLegend',keys,COLORS,'metricsChart',drawMetrics,labels);
  // Say so, rather than letting a 0-100% axis imply the metrics ARE
  // percentages. Sets the WHOLE label rather than appending: a legend click
  // redraws this chart without going through `render`, so an append would
  // stack up across toggles.
  const scopeEl=document.getElementById('metricsScope');
  if(scopeEl){
    const scaling=!solo&&keys.length>1;
    scopeEl.textContent=scopeLabel()+
      (scaling?' · each curve scaled to its own range, click one for real values':'');
  }
}

function drawResources(){
  const node=nodeOf(current);
  const solo=soloState.resourceChart;
  const names=[],series={},colors=[];
  const add=(name,s,color)=>{if(s.length){names.push(name);series[name]=s;colors.push(color)}};
  add('gpu',seriesOf(node,'res','gpu_util'),RES_COLORS.gpu);
  // Each point is an INTERVAL, not an instant: `gpu` is the mean over the
  // window, `gpu peak` the max. Both matter and neither implies the other —
  // a device pegged for most of a window between two idle syncs has a modest
  // mean and a peak of 100, and reporting only one of them is how a busy GPU
  // came to look idle. Absent on archives written before peaks existed, and
  // `add` skips empty series, so those pages simply keep one gpu line.
  add('gpu peak',seriesOf(node,'res','gpu_util_max'),RES_COLORS.gpuPeak);
  add('vram',pctSeries(node,'vram_alloc','vram_total'),RES_COLORS.vram);
  // cpu / ram exist only where the level's own rows carry them (the `/events`
  // fallback root). They are per-host facts outside the record tree, so in a
  // cluster run they appear as gauges only, never as a curve on an axis they
  // do not share.
  add('cpu',seriesOf(node,'res','cpu'),RES_COLORS.cpu);
  add('ram',pctSeries(node,'ram_used','ram_total'),RES_COLORS.ram);

  const vramTotal=lastResValue(node,'vram_total');
  let drawn=series,drawColors=colors,pct=true,yFmt=null,ref=null;
  if(solo==='vram'&&vramTotal){
    // Solo VRAM: absolute bytes against the physical limit.
    drawn={vram:seriesOf(node,'res','vram_alloc')};drawColors=[RES_COLORS.vram];pct=false;
    yFmt=fmtBytes;ref={value:vramTotal,dotted:false,color:THEME.ref,label:'Physical VRAM'};
  }else if(solo==='ram'){
    drawn={ram:seriesOf(node,'res','ram_used')};drawColors=[RES_COLORS.ram];pct=false;yFmt=fmtBytes;
  }else if(solo==='gpu'||solo==='cpu'||solo==='gpu peak'){
    // Colour comes from the parallel `names`/`colors` arrays rather than
    // `RES_COLORS[solo]`: a series' DISPLAY name need not be a palette key
    // (`gpu peak` isn't), and indexing the palette by display name silently
    // yields undefined instead of failing.
    drawn={};drawn[solo]=series[solo]||[];
    drawColors=[colors[names.indexOf(solo)]];yFmt=pctFmt;
  }else if(names.includes('vram')&&vramTotal){
    ref={value:100,dotted:true,color:THEME.refDim,label:'VRAM limit'};
  }
  // Whatever branch ran, the drawn key set is named exactly as the legend is,
  // so `soloState` alone drives the filtering inside drawChart.
  drawChart('resourceChart',drawn,drawColors,{
    percent:pct,yFmt:yFmt||(pct?pctFmt:null),refLine:ref,marks:epochMarks(node),
  });
  updateLegend('resourceLegend',names,colors,'resourceChart',drawResources,
               {cpu:'CPU',gpu:'GPU (mean)',ram:'RAM',vram:'VRAM','gpu peak':'GPU (peak)'});
  updateGauges(node);
}

function lastResValue(node,key){
  for(let i=node.rows.length-1;i>=0;i--){const v=node.rows[i].res[key];if(v!=null)return v}
  return null;
}

/// Gauges are last-known values. GPU / VRAM follow the level (drilling into a
/// rank shows that rank's card); CPU / RAM come from the run feed, whose scope
/// is the cohort in a cluster run and the host in a single-process one.
function updateGauges(node){
  const cohort=recordMode;
  document.getElementById('cpuLabel').textContent=cohort?'CPU (cohort mean)':'CPU';
  document.getElementById('ramLabel').textContent=cohort?'RAM (cohort)':'RAM';
  setBar('cpu',HOST.cpu,pctFmt);
  if(HOST.ram_used!=null&&HOST.ram_total){
    document.getElementById('ramBar').style.width=(HOST.ram_used/HOST.ram_total*100)+'%';
    document.getElementById('ramVal').textContent=fmtBytes(HOST.ram_used)+' / '+fmtBytes(HOST.ram_total);
  }
  const util=lastResValue(node,'gpu_util');
  setBar('gpu',util!=null?util:(current===ROOT?HOST.gpu:null),pctFmt);
  const alloc=lastResValue(node,'vram_alloc');
  const total=lastResValue(node,'vram_total');
  const useAlloc=alloc!=null?alloc:(current===ROOT?HOST.vram_alloc:null);
  const useTotal=total!=null?total:(current===ROOT?HOST.vram_total:null);
  if(useAlloc!=null){
    const t=useTotal||0;
    const p=t>0?Math.min(useAlloc/t*100,100):0;
    const spill=t>0&&useAlloc>t?useAlloc-t:0;
    const bar=document.getElementById('vramBar');
    bar.style.width=p+'%';
    bar.style.background=spill>0?'var(--red)':'var(--yellow)';
    document.getElementById('vramVal').textContent=fmtBytes(useAlloc)+(t>0?' / '+fmtBytes(t):'');
  }
}
function setBar(id,val,fmt){
  if(val==null)return;
  document.getElementById(id+'Bar').style.width=Math.min(val,100)+'%';
  document.getElementById(id+'Val').textContent=fmt(val);
}

// --- Children --------------------------------------------------------------
function childPaths(node){
  return Array.from(node.children).sort(natCmp);
}
function renderChildren(){
  const node=nodeOf(current);
  const kids=childPaths(node);
  const card=document.getElementById('childrenCard');
  const note=document.getElementById('childrenNote');
  if(!kids.length){
    // A node that declares children but has none loaded is not a childless
    // node — the level was never fetched. Saying so beats hiding the card and
    // letting it read as "this rank has nothing under it".
    const declared=node.childCount;
    if(declared>0){
      card.style.display='block';
      note.style.display='block';
      note.textContent=levelUnreachable
        ? declared+' children reported, none loaded — the dashboard server is not answering. '+
          'A level is fetched when you open it, so one never opened while the run was live '+
          'has no data once the run ends.'
        : declared+' children reported, waiting for their records…';
      document.getElementById('childrenCount').textContent=declared;
      document.getElementById('childrenHeader').innerHTML='';
      document.getElementById('childrenBody').innerHTML='';
      drawChart('childrenChart',{},[],{});
      updateLegend('childrenLegend',[],[],'childrenChart',renderChildren,{});
      return;
    }
    card.style.display='none';return;
  }
  card.style.display='block';
  note.style.display='none';

  // Level-aware legend: the child's own path segment, plus its label (the GPU
  // model the producer attached) when there is one.
  const labels={},keySet=new Set(),resSet=new Set();
  for(const p of kids){
    const k=NODES.get(p);
    labels[p]=childLegend(p);
    if(k)for(const m of k.metricKeys)keySet.add(m);
    if(k)for(const m of k.resKeys)resSet.add(m);
  }
  const metricCols=Array.from(keySet).sort();
  const options=metricCols.slice();
  if(resSet.has('gpu_util'))options.push('gpu_util');
  if(resSet.has('vram_alloc'))options.push('vram_alloc');
  syncCompareOptions(options);

  const series={},colors=[],names=[];
  const isRes=compareKey==='gpu_util'||compareKey==='vram_alloc';
  kids.forEach((p,i)=>{
    const k=NODES.get(p);
    if(!k)return;
    const s=isRes?seriesOf(k,'res',compareKey):seriesOf(k,'metrics',compareKey);
    if(!s.length)return;
    names.push(p);series[p]=s;colors.push(COLORS[i%COLORS.length]);
  });
  drawChart('childrenChart',series,colors,{
    marks:epochMarks(node),yFmt:fmtForKey(compareKey),labels,
  });
  updateLegend('childrenLegend',names,colors,'childrenChart',renderChildren,labels);

  const alive=kids.filter(p=>NODES.get(p)&&NODES.get(p).alive!==false).length;
  document.getElementById('childrenCount').textContent=
    kids.length+(alive!==kids.length?' ('+alive+' alive)':'');

  const cols=['node','dev','work'].concat(metricCols).concat(['gpu','vram']);
  const hdr=document.getElementById('childrenHeader');
  hdr.innerHTML=cols.map(c=>'<th>'+esc(c)+'</th>').join('');
  const body=document.getElementById('childrenBody');
  body.innerHTML='';
  for(const p of kids){
    const k=NODES.get(p);
    const last=k&&k.lastRow;
    const tr=document.createElement('tr');
    tr.className='drill'+(k&&k.alive===false?' dead':'');
    let html='<td class="node-cell">'+esc(lastSeg(p))+
             (k&&k.label?'<span class="lbl">'+esc(k.label)+'</span>':'')+'</td>';
    html+='<td>'+(k&&k.device!=null?k.device:'—')+'</td>';
    html+='<td>'+(last&&last.work!=null?fmtVal(last.work):'—')+'</td>';
    for(const key of metricCols){
      const v=lastMetric(k,key);
      html+='<td>'+(v!=null?fmtForKey(key)(v):'—')+'</td>';
    }
    const u=k?lastResValue(k,'gpu_util'):null;
    html+='<td>'+(u!=null?pctFmt(u):'—')+'</td>';
    const a=k?lastResValue(k,'vram_alloc'):null;
    html+='<td>'+(a!=null?fmtBytes(a):'—')+'</td>';
    tr.innerHTML=html;
    tr.onclick=()=>navigate(p);
    body.appendChild(tr);
  }
}
function childLegend(path){
  const k=NODES.get(path);
  const seg=lastSeg(path);
  return k&&k.label?seg+' · '+k.label:seg;
}
function lastMetric(node,key){
  if(!node)return null;
  for(let i=node.rows.length-1;i>=0;i--){const v=node.rows[i].metrics[key];if(v!=null)return v}
  return null;
}
function syncCompareOptions(options){
  const sel=document.getElementById('compareMetric');
  const want=options.join('|');
  if(sel.dataset.opts!==want){
    sel.dataset.opts=want;
    sel.innerHTML=options.map(o=>'<option value="'+esc(o)+'">'+esc(o)+'</option>').join('');
  }
  if(!compareKey||!options.includes(compareKey)){
    compareKey=['loss','throughput','batch_share'].find(k=>options.includes(k))||options[0]||null;
  }
  if(compareKey)sel.value=compareKey;
}
function onCompareChange(){
  compareKey=document.getElementById('compareMetric').value;
  soloState.childrenChart=null;
  renderChildren();
}

// --- Log -------------------------------------------------------------------
function renderLog(){
  const node=nodeOf(current);
  const keys=metricKeys(node);
  const empty=document.getElementById('logEmpty');
  const header=document.getElementById('logHeader');
  const body=document.getElementById('logBody');
  if(!node.rows.length){
    empty.style.display='block';header.innerHTML='';body.innerHTML='';return;
  }
  empty.style.display='none';
  const cols=['t','epoch'];
  if(recordMode)cols.push('window','work');
  const cells=cols.concat(keys).concat(['res']);
  header.innerHTML=cells.map(c=>'<th>'+esc(c)+'</th>').join('');
  const stop=Math.max(0,node.rows.length-MAX_LOG_ROWS);
  let html='';
  for(let i=node.rows.length-1;i>=stop;i--){
    const r=node.rows[i];
    let tds='<td>'+fmtDur(r.t)+'</td>';
    tds+='<td>'+(r.epoch1!=null?r.epoch1:'—')+'</td>';
    if(recordMode){
      tds+='<td>'+(r.tick!=null?r.tick:'—')+'</td>';
      // `work` is a per-record interval quantity whose unit differs by cadence
      // (steps for a window, batch share for an epoch), so it is a column and
      // never a curve.
      tds+='<td>'+(r.work!=null?fmtVal(r.work):'—')+'</td>';
    }
    for(const k of keys){
      const v=r.metrics[k];
      tds+='<td>'+(v!=null?fmtForKey(k)(v):'—')+'</td>';
    }
    tds+='<td class="res-cell">'+esc(resSummary(r.res))+'</td>';
    html+='<tr class="'+(r.ec?'epoch-row':'')+'">'+tds+'</tr>';
  }
  body.innerHTML=html;
}
function resSummary(res){
  const out=[];
  if(res.cpu!=null)out.push('CPU:'+res.cpu.toFixed(0)+'%');
  if(res.gpu_util!=null)out.push('GPU:'+res.gpu_util.toFixed(0)+'%');
  if(res.vram_alloc!=null){
    const t=res.vram_total;
    out.push('VRAM:'+fmtBytes(res.vram_alloc)+(t?'/'+fmtBytes(t):''));
  }
  if(res.ram_used!=null&&res.ram_total)out.push('RAM:'+fmtBytes(res.ram_used));
  return out.join(' ');
}

// --- Alerts ----------------------------------------------------------------
function renderAlerts(){
  const card=document.getElementById('alertsCard');
  const badge=document.getElementById('alertBadge');
  const list=Array.from(ALERTS.values()).sort((a,b)=>b.ts-a.ts);
  if(!list.length){card.style.display='none';badge.classList.remove('on');return}
  card.style.display='block';
  const critical=list.filter(a=>a.sev==='critical').length;
  badge.classList.add('on');
  badge.classList.toggle('warn',critical===0);
  badge.textContent=critical>0?critical+' critical':list.length+' alert'+(list.length>1?'s':'');
  const body=document.getElementById('alertsBody');
  body.innerHTML='';
  for(const a of list){
    const tr=document.createElement('tr');
    let html='<td class="res-cell">'+esc(fmtClock(a.ts))+'</td>';
    html+='<td class="sev-'+esc(a.sev)+'">'+esc(a.class)+'</td>';
    html+='<td class="node-cell">'+esc(a.path)+'</td>';
    html+='<td class="res-cell">'+esc(a.detail||'')+'</td>';
    html+='<td>'+a.total+'</td>';
    tr.innerHTML=html;
    // The origin path is a real node in the tree, so an alert is a jump to it.
    if(NODES.has(a.path)||a.path===ROOT){
      tr.className='drill';
      tr.onclick=()=>navigate(a.path);
    }
    body.appendChild(tr);
  }
}
function scrollToAlerts(){
  const card=document.getElementById('alertsCard');
  if(card.style.display!=='none')card.scrollIntoView({behavior:'smooth',block:'center'});
}

// --- Chart engine ----------------------------------------------------------
// Series are `{name: [{t, v}]}` on a shared elapsed-seconds axis — the only
// axis the two cadences have in common. Epoch boundaries become the x labels
// (`e3`), so the chart still reads in epochs while staying metric in time.
function drawChart(canvasId,series,colors,opts){
  opts=opts||{};
  const canvas=document.getElementById(canvasId);
  if(!canvas)return;
  const ctx=canvas.getContext('2d');
  const dpr=window.devicePixelRatio||1;
  const rect=canvas.getBoundingClientRect();
  canvas.width=Math.max(1,rect.width*dpr);canvas.height=Math.max(1,rect.height*dpr);
  ctx.scale(dpr,dpr);
  const W=rect.width,H=rect.height;
  const M={top:10,right:12,bottom:24,left:opts.yFmt?70:52};
  const pw=W-M.left-M.right,ph=H-M.top-M.bottom;
  ctx.clearRect(0,0,W,H);

  const allNames=Object.keys(series);
  const solo=soloState[canvasId];
  const visible=allNames.filter(n=>!solo||n===solo);
  // Independent per-series scaling, for charts that opt in.
  //
  // Mixed-unit series share no meaningful axis: loss ~5, throughput ~0.05 and
  // compute_only_ms ~1e5 on one linear scale means the milliseconds saturate it
  // and every other curve is a flat line on the floor. Giving each series the
  // full height shows all four shapes at once, which is the view you actually
  // want when everything is displayed.
  //
  // Opt-in per chart, because it is WRONG where a shared scale is real: the
  // resource chart's series are all percentages, and the children chart
  // compares ONE metric across children — normalising either would destroy a
  // comparison the reader is relying on.
  //
  // Soloing a series drops back to its true axis, so exact magnitudes are
  // always one click away, and the tooltip reports raw values in every mode.
  const scaled=!!opts.normalize&&!solo&&visible.length>1;
  let minT=Infinity,maxT=-Infinity,minV=Infinity,maxV=-Infinity;
  for(const n of allNames)for(const p of series[n]){
    if(p.t<minT)minT=p.t;if(p.t>maxT)maxT=p.t;
  }
  // Per-series extents, only needed in scaled mode.
  const range={};
  if(scaled)for(const n of visible){
    let lo=Infinity,hi=-Infinity;
    for(const p of series[n]){if(p.v<lo)lo=p.v;if(p.v>hi)hi=p.v}
    // A series that never varies would divide by zero; widening it parks the
    // flat line mid-height rather than stretching noise across the canvas.
    if(!isFinite(lo)){lo=0;hi=1}
    if(lo===hi){lo-=1;hi+=1}
    range[n]=[lo,hi];
  }
  for(const n of visible)for(const p of series[n]){
    if(p.v<minV)minV=p.v;if(p.v>maxV)maxV=p.v;
  }
  if(!isFinite(minT)){
    ctx.fillStyle=THEME.dim;ctx.font='12px -apple-system,sans-serif';ctx.textAlign='center';
    ctx.fillText('no data yet',W/2,H/2);
    canvas._layout=null;
    return;
  }
  if(!isFinite(minV)){minV=0;maxV=1}
  if(minV===maxV){minV-=1;maxV+=1}
  if(opts.percent){minV=Math.min(0,minV);maxV=Math.max(100,maxV)}
  if(opts.refLine!=null&&!scaled){minV=Math.min(minV,opts.refLine.value);maxV=Math.max(maxV,opts.refLine.value)}
  // In scaled mode the axis is a fraction of each series' own range, so the
  // shared 0..1 is the axis and the 5% padding belongs to no series.
  if(scaled){minV=0;maxV=1}
  else{const pad=(maxV-minV)*0.05;minV-=pad;maxV+=pad}
  // Byte scales can never be negative: padding under a large reference line
  // would otherwise render nonsense "-200 MB" gridlines.
  if(opts.yFmt===fmtBytes)minV=Math.max(0,minV);
  const span=Math.max(1e-9,maxT-minT);
  const xScale=t=>M.left+((t-minT)/span)*pw;
  const yScale=v=>M.top+ph-(v-minV)/(maxV-minV)*ph;
  // Series-aware placement: in scaled mode each series maps its OWN range onto
  // the full height; otherwise every series shares the axis above.
  const yOf=(n,v)=>{
    if(!scaled)return yScale(v);
    const r=range[n];
    if(!r)return yScale(v);
    return M.top+ph-((v-r[0])/(r[1]-r[0]))*ph;
  };

  const yLabel=opts.yFmt||fmtVal;
  ctx.strokeStyle=THEME.grid;ctx.lineWidth=1;
  for(let i=0;i<=4;i++){
    const v=minV+(maxV-minV)*i/4;
    const y=yScale(v);
    ctx.beginPath();ctx.moveTo(M.left,y);ctx.lineTo(W-M.right,y);ctx.stroke();
    ctx.fillStyle=THEME.dim;ctx.font='10px -apple-system,sans-serif';ctx.textAlign='right';
    // Absolute values would be a lie when each curve has its own range: label
    // the axis as the fraction of a series' own span that it is.
    ctx.fillText(scaled?Math.round(i/4*100)+'%':yLabel(v),M.left-6,y+3);
  }

  // X axis: epoch boundaries when we have them, plain elapsed otherwise.
  const marks=(opts.marks||[]).filter(m=>m.t>=minT&&m.t<=maxT);
  ctx.textAlign='center';ctx.font='10px -apple-system,sans-serif';
  if(marks.length){
    const step=Math.max(1,Math.ceil(marks.length/8));
    for(let i=0;i<marks.length;i+=step){
      const m=marks[i],x=xScale(m.t);
      ctx.strokeStyle='rgba(108,140,255,0.13)';
      ctx.beginPath();ctx.moveTo(x,M.top);ctx.lineTo(x,M.top+ph);ctx.stroke();
      ctx.fillStyle=THEME.dim;ctx.fillText(m.label,x,H-M.bottom+14);
    }
  }else{
    for(let i=0;i<=4;i++){
      const t=minT+span*i/4;
      ctx.fillStyle=THEME.dim;ctx.fillText(fmtDur(t),xScale(t),H-M.bottom+14);
    }
  }

  // A reference line is a value on a shared axis; in scaled mode there is no
  // shared axis for it to sit on, so it is omitted rather than drawn somewhere
  // arbitrary. (No opted-in chart uses one today; this keeps it honest if one
  // ever does.)
  if(opts.refLine!=null&&!scaled){
    const ry=yScale(opts.refLine.value);
    if(ry>=M.top&&ry<=M.top+ph){
      ctx.save();
      ctx.strokeStyle=opts.refLine.color||THEME.dim;
      ctx.lineWidth=1.5;
      if(opts.refLine.dotted)ctx.setLineDash([6,4]);
      ctx.beginPath();ctx.moveTo(M.left,ry);ctx.lineTo(W-M.right,ry);ctx.stroke();
      ctx.setLineDash([]);
      if(opts.refLine.label){
        ctx.fillStyle=opts.refLine.color||THEME.dim;
        ctx.font='9px -apple-system,sans-serif';ctx.textAlign='right';
        ctx.fillText(opts.refLine.label,W-M.right,ry-4);
      }
      ctx.restore();
    }
  }

  allNames.forEach((n,si)=>{
    if(solo&&solo!==n)return;
    const pts=series[n];
    if(!pts.length)return;
    const color=colors[si%colors.length]||COLORS[si%COLORS.length];
    ctx.strokeStyle=color;ctx.lineWidth=solo?3:2;ctx.beginPath();
    pts.forEach((p,i)=>{
      const x=xScale(p.t),y=yOf(n,p.v);
      if(i===0)ctx.moveTo(x,y);else ctx.lineTo(x,y);
    });
    ctx.stroke();
    const last=pts[pts.length-1];
    ctx.fillStyle=color;ctx.beginPath();
    ctx.arc(xScale(last.t),yOf(n,last.v),3,0,Math.PI*2);ctx.fill();
  });

  canvas._layout={xScale,minT,maxT,series,names:allNames,colors,solo,
                  yFmt:yLabel,labels:opts.labels||null};
}

function updateLegend(id,names,colors,chartId,redrawFn,labels){
  const el=document.getElementById(id);
  const want=names.join('|');
  if(el.dataset.names!==want){
    el.dataset.names=want;
    el.innerHTML='';
    names.forEach((n,i)=>{
      const item=document.createElement('div');
      item.className='legend-item';
      item.dataset.name=n;
      const dot=document.createElement('div');
      dot.className='legend-dot';
      dot.style.background=colors[i%colors.length]||COLORS[i%COLORS.length];
      item.appendChild(dot);
      item.appendChild(document.createTextNode((labels&&labels[n])||n));
      item.addEventListener('click',()=>{
        soloState[chartId]=soloState[chartId]===n?null:n;
        redrawFn();
      });
      el.appendChild(item);
    });
  }
  const solo=soloState[chartId];
  Array.from(el.children).forEach(item=>{
    const n=item.dataset.name;
    item.classList.toggle('solo',solo===n);
    item.classList.toggle('dimmed',solo!==null&&solo!==n);
  });
}

// --- Tooltip ---------------------------------------------------------------
['metricsChart','resourceChart','childrenChart'].forEach(id=>{
  const canvas=document.getElementById(id);
  if(!canvas)return;
  canvas.addEventListener('mousemove',e=>{
    const L=canvas._layout;
    const tip=document.getElementById('tooltip');
    if(!L){tip.style.display='none';return}
    const rect=canvas.getBoundingClientRect();
    const mx=e.clientX-rect.left;
    // Nearest point in x across the visible series.
    let best=Infinity,bestRow=null,bestT=null;
    for(const n of L.names){
      if(L.solo&&L.solo!==n)continue;
      for(const p of L.series[n]){
        const d=Math.abs(L.xScale(p.t)-mx);
        if(d<best){best=d;bestRow=p.row||null;bestT=p.t}
      }
    }
    if(best>30||bestT==null){tip.style.display='none';return}
    let html='<b>'+rowTitle(bestRow,bestT)+'</b>';
    const fmt=L.yFmt||fmtVal;
    for(const n of L.names){
      if(L.solo&&L.solo!==n)continue;
      // Match by the same instant, so a series that did not report at this
      // point stays absent instead of showing a neighbour's value.
      const p=L.series[n].find(q=>q.t===bestT);
      if(!p)continue;
      const c=L.colors[L.names.indexOf(n)%L.colors.length]||COLORS[0];
      const name=(L.labels&&L.labels[n])||n;
      html+='<br><span style="color:'+c+'">&#9632;</span> '+esc(name)+': '+fmt(p.v);
    }
    tip.innerHTML=html;tip.style.display='block';
    let tx=e.clientX+14,ty=e.clientY-10;
    if(tx+tip.offsetWidth>window.innerWidth)tx=e.clientX-tip.offsetWidth-14;
    if(ty+tip.offsetHeight>window.innerHeight)ty=e.clientY-tip.offsetHeight-10;
    tip.style.left=tx+'px';tip.style.top=ty+'px';
  });
  canvas.addEventListener('mouseleave',()=>{document.getElementById('tooltip').style.display='none'});
});
function rowTitle(row,t){
  const bits=[];
  if(row&&row.epoch1!=null)bits.push('epoch '+row.epoch1);
  if(row&&row.tick!=null)bits.push('window '+row.tick);
  bits.push(fmtDur(t));
  return esc(bits.join(' · '));
}

// --- Label / metadata / graph ---------------------------------------------
function applyLabelHash(label,hash){
  const h1=document.querySelector('.header h1');
  if(!h1)return;
  const short=hash?hash.substring(0,8):null;
  if(label&&short)h1.innerHTML='floDl <span>'+esc(label)+' ['+esc(short)+']</span>';
  else if(short)h1.innerHTML='floDl <span>['+esc(short)+']</span>';
  if(label||short)document.title='floDl'+(label?' - '+label:'')+(short?' ['+short+']':'');
}
function showMeta(meta){
  if(!meta)return;
  const card=document.getElementById('metaCard'),pre=document.getElementById('metaPre');
  if(!card||!pre)return;
  try{pre.textContent=typeof meta==='string'?meta:JSON.stringify(meta,null,2)}
  catch(e){pre.textContent=String(meta)}
  card.dataset.have='1';
  card.style.display=current===ROOT?'block':'none';
}
// The producer composes one cohort-wide hardware string
// (`host: <cpu> | gr=N lr=M: <gpu> | host2: <cpu> | …` in cluster mode, plain
// `<cpu> | <gpu> …` single-process). Kept verbatim as the source of truth and
// scoped per level by `hwForLevel` below.
let HARDWARE=null;
function showHardware(hw){
  if(!hw)return;
  HARDWARE=hw;
  renderHardware();
}
/// Is this segment of the hardware string a rank's GPU entry?
function isGpuSeg(s){return /^gr=\d+\s+lr=\d+:/.test(s)}
/// Host name a `host: <cpu>` segment describes, or null.
function hostOfSeg(s){const m=s.match(/^([^:]+):\s*(.*)$/);return m&&!isGpuSeg(s)?m[1]:null}
/// Does the record tree carry a host tier (`root/<host>/<rank>`)? A single-host
/// cohort collapses to `root/<rank>`, so depth is the discriminator.
function hasHostTier(){
  for(const p of NODES.keys())if(p.split('/').length>=3)return true;
  return false;
}
/// Level-scoped hardware line.
///
/// The GPUs a level owns fall straight out of the record plane's depth-1
/// scoping, so this needs no extra wire data: a rank carries its own `label`,
/// a host's GPUs are its direct children's labels, and root's direct children
/// are hosts, which carry none — which is exactly why root reads as CPU-only.
/// A cohort-wide GPU list at every level was claiming a rank owns three GPUs.
function hwForLevel(){
  if(!HARDWARE)return null;
  const segs=HARDWARE.split(' | ').map(s=>s.trim()).filter(Boolean);
  // `recordMode` only flips on the FIRST record, but `/events` delivers the
  // hardware string before that — so gating purely on it painted the whole
  // cohort inventory for a beat and then collapsed to the level's scope, which
  // reads as losing information rather than as scoping. The string says which
  // it is: the cluster form carries `gr=N lr=M:` GPU markers. When it does,
  // scope from the first paint; the single-process form has no levels to scope
  // to and keeps its verbatim passthrough whether or not records ever arrive.
  const clustered=segs.some(isGpuSeg);
  if(!recordMode&&!clustered)return HARDWARE;
  // CPU side: the host this level sits on, or every host at root. The
  // single-process form carries no `gr=` markers and no host prefixes, so its
  // GPU segments would otherwise read as CPUs — there, only the first segment
  // is the CPU and the rest are GPUs the record plane will re-derive.
  const host=current===ROOT?null:current.split('/')[1];
  // An unattributed string (single-process form) describes ONE box. That is the
  // right answer at every level of a single-host run, but on a cohort with a
  // host tier it would claim the controller's CPU at a remote rank's level — so
  // there, show it at root only and omit rather than assert. Reachable when a
  // rank never shipped its hardware (died early, or an archive built before it
  // arrived); the GPU side still resolves from the per-node labels.
  const cpus=clustered
    ? segs.filter(s=>!isGpuSeg(s))
          .filter(s=>{const h=hostOfSeg(s);return !host||!h||h===host})
    : (current===ROOT||!hasHostTier()?segs.slice(0,1):[]);
  // GPU side: this node's own label at a leaf, its children's at an interior.
  const node=nodeOf(current);
  const gpus=[];
  if(node.label)gpus.push(node.label);
  else for(const p of childPaths(node)){const k=NODES.get(p);if(k&&k.label)gpus.push(k.label)}
  const counted=[];
  for(const g of gpus){
    const last=counted[counted.length-1];
    if(last&&last.name===g)last.n++;else counted.push({name:g,n:1});
  }
  return cpus.concat(counted.map(c=>c.n>1?c.n+'x '+c.name:c.name)).join(' | ');
}
function renderHardware(){
  const el=document.getElementById('hwInfo');
  if(!el)return;
  const line=hwForLevel();
  if(!line){el.style.display='none';return}
  el.textContent=line;el.style.display='block';
}
// Opened height is capped to most of the viewport: a deep model's graph is
// taller than any screen, so the card scrolls internally instead of pushing
// every other card thousands of pixels down the page.
function svgOpenHeight(c){return Math.min(c.scrollHeight,Math.round(window.innerHeight*0.7))}
function showSvg(svg){
  const card=document.getElementById('svgCard'),c=document.getElementById('svgContainer');
  card.dataset.have='1';
  card.style.display=current===ROOT?'block':'none';
  c.innerHTML=svg;
  if(document.getElementById('svgToggle').classList.contains('open')){
    c.style.overflowY='auto';
    c.style.maxHeight=svgOpenHeight(c)+'px';
  }
}
function toggleSvg(){
  const t=document.getElementById('svgToggle'),c=document.getElementById('svgContainer');
  const opening=!t.classList.contains('open');
  t.classList.toggle('open');
  // Hidden while collapsing so the scrollbar doesn't flicker on the way out.
  c.style.overflowY=opening?'auto':'hidden';
  c.style.maxHeight=opening?svgOpenHeight(c)+'px':'0';
}
function seedGpuInit(list){
  for(const g of list||[]){
    if(g.dev==null)continue;
    GPU_INIT.set(g.dev,{name:g.name,vram_total:g.vram_total});
  }
}

// --- Formatters ------------------------------------------------------------
function fmtDur(s){
  if(s==null)return '—';
  if(s<1)return Math.round(s*1000)+'ms';
  if(s<60){const w=Math.floor(s);const f=Math.floor((s-w)*10);return f>0?w+'.'+f+'s':w+'s'}
  const h=Math.floor(s/3600),m=Math.floor(s%3600/60),sec=Math.floor(s%60);
  if(h>0)return h+'h '+String(m).padStart(2,'0')+'m';
  return m+'m '+String(sec).padStart(2,'0')+'s';
}
function fmtBytes(b){
  const GB=1073741824,MB=1048576;
  if(b>=GB)return(b/GB).toFixed(1)+' GB';
  if(b>=MB)return Math.round(b/MB)+' MB';
  return Math.round(b/1024)+' KB';
}
function fmtVal(v){
  if(v==null)return '—';
  if(Math.abs(v)<0.001&&v!==0)return v.toExponential(2);
  if(Math.abs(v)>=1000)return v.toFixed(1);
  return v.toFixed(4);
}
function pctFmt(v){return v.toFixed(0)+'%'}
/// Unit by key name: the record schema names resources and shares explicitly,
/// so the axis formatter follows from the key rather than from a per-chart flag.
function fmtForKey(k){
  if(k==null)return fmtVal;
  if(k==='cpu'||k==='gpu_util')return pctFmt;
  if(k==='batch_share')return v=>(v*100).toFixed(1)+'%';
  if(k.indexOf('vram')===0||k.indexOf('ram_')===0)return fmtBytes;
  if(k.indexOf('_ms')>0)return v=>fmtDur(v/1000);
  return fmtVal;
}
function fmtClock(ms){
  if(!ms)return '—';
  const d=new Date(ms);
  return String(d.getHours()).padStart(2,'0')+':'+String(d.getMinutes()).padStart(2,'0')+
         ':'+String(d.getSeconds()).padStart(2,'0');
}
function esc(s){
  return String(s==null?'':s).replace(/&/g,'&amp;').replace(/</g,'&lt;')
    .replace(/>/g,'&gt;').replace(/"/g,'&quot;');
}
function shortGpuName(name){
  return String(name||'').replace(/^NVIDIA\s+/i,'').replace(/GeForce\s+/i,'');
}

// --- Boot ------------------------------------------------------------------
// Injected constants first: they carry identity and device names the very
// first record / epoch then builds on.
if(typeof ARCHIVE_LABEL!=='undefined'||typeof ARCHIVE_HASH!=='undefined'){
  applyLabelHash(typeof ARCHIVE_LABEL!=='undefined'?ARCHIVE_LABEL:null,
                 typeof ARCHIVE_HASH!=='undefined'?ARCHIVE_HASH:null);
}
if(typeof LIVE_LABEL!=='undefined'||typeof LIVE_HASH!=='undefined'){
  applyLabelHash(typeof LIVE_LABEL!=='undefined'?LIVE_LABEL:null,
                 typeof LIVE_HASH!=='undefined'?LIVE_HASH:null);
}
if(typeof ARCHIVE_HARDWARE!=='undefined')showHardware(ARCHIVE_HARDWARE);
if(typeof LIVE_HARDWARE!=='undefined')showHardware(LIVE_HARDWARE);
if(typeof ARCHIVE_META!=='undefined'&&ARCHIVE_META!==null)showMeta(ARCHIVE_META);
if(typeof LIVE_META!=='undefined'&&LIVE_META!==null)showMeta(LIVE_META);
if(typeof ARCHIVE_GPU_INIT!=='undefined'&&ARCHIVE_GPU_INIT!==null)seedGpuInit(ARCHIVE_GPU_INIT);
if(typeof LIVE_GPU_INIT!=='undefined'&&LIVE_GPU_INIT!==null)seedGpuInit(LIVE_GPU_INIT);

current=pathFromHash();

// ARCHIVE_DATA is injected by monitor.save_html(): replay it instead of
// connecting. The baked archive carries epochs, so it lands on the same
// `/events` fallback path a single-process live run uses.
if(typeof ARCHIVE_DATA!=='undefined'){
  // A baked record plane makes the saved page the PORTAL rather than the
  // epoch-feed fallback: real levels, both cadences interleaved, the `meta`
  // reduction declarations. Enter record mode BEFORE replaying the epoch feed
  // so that feed contributes only the run clock and the host gauges — exactly
  // the division of labour it has live, since the record plane owns levels.
  //
  // Deliberately not via `latchRecordMode()`: that exists to abandon the
  // fallback tree *mid-run* and sends a deep-linked viewer back to root. Every
  // level is baked here, so a `#path=` link into a saved page must keep working.
  const archRecords=(typeof ARCHIVE_RECORDS!=='undefined'&&Array.isArray(ARCHIVE_RECORDS))
    ?ARCHIVE_RECORDS:[];
  if(archRecords.length)recordMode=true;

  let archiveErr=null,done=0;
  for(let i=0;i<ARCHIVE_DATA.length;i++){
    try{ingestEpoch(ARCHIVE_DATA[i]);done++}
    catch(e){archiveErr=e;console.error('ingestEpoch failed at index '+i+':',e);break}
  }
  for(let i=0;i<archRecords.length;i++){
    try{ingestRecord(archRecords[i])}
    catch(e){
      archiveErr=archiveErr||e;
      console.error('ingestRecord failed at index '+i+':',e);
      break;
    }
  }
  try{render()}catch(e){console.error('render:',e);archiveErr=archiveErr||e}
  // Wall-clock elapsed is meaningless in an archive: sum the epoch durations.
  document.getElementById('elapsedDisplay').textContent=
    fmtDur(ARCHIVE_DATA.reduce((s,d)=>s+(d.duration||0),0));
  markComplete(archiveErr?'Archive error - see console':
    (typeof ARCHIVE_COMPLETE!=='undefined'?ARCHIVE_COMPLETE:'Complete'));
  if(typeof ARCHIVE_SVG==='string'){try{showSvg(ARCHIVE_SVG)}catch(e){console.error('showSvg:',e)}}
  requestAnimationFrame(()=>{try{render()}catch(e){console.error('rAF render:',e)}});
  if(archiveErr){
    const d=document.createElement('div');
    d.style.cssText='position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:#1a1d27;color:#f87171;padding:24px;border-radius:8px;border:1px solid #f87171;z-index:999;font-family:monospace;max-width:80%;white-space:pre-wrap';
    d.textContent='Archive replay error at epoch '+(done+1)+':\n'+archiveErr.message+
      '\n\nCheck browser console (F12) for details.\nProcessed '+done+'/'+ARCHIVE_DATA.length+' epochs.';
    document.body.appendChild(d);
  }
}else{
  const es=new EventSource('/events');
  es.addEventListener('epoch',e=>{try{ingestEpoch(JSON.parse(e.data))}catch(err){}});
  es.addEventListener('complete',()=>markComplete());
  subscribeRoot();
  setLevel(current);
  if(!elapsedTimer)elapsedTimer=setInterval(updateElapsed,1000);
  fetch('/graph.svg').then(r=>{if(r.ok)return r.text();throw 0}).then(showSvg).catch(()=>{});
}

window.addEventListener('resize',()=>scheduleRender());
</script>
</body>
</html>