Struct TraceJitConfig 

pub struct TraceJitConfig {
    pub trace_threshold: u32,
    pub block_threshold: u32,
    pub max_side_exits: u32,
    pub max_inline_recursion: usize,
    pub max_trace_chain: usize,
    pub max_trace_len: usize,
}

Tunable thresholds for the tracing JIT.

All hot/threshold/cap values are surfaced here so callers can adjust the JIT for their workload without recompiling fusevm. Defaults match the constants used through phase 9; aggressive workloads (very hot short loops) might want lower thresholds, while cold-start workloads (script that runs once) might want higher thresholds to avoid spending compile time on traces that won’t pay off.

Apply via JitCompiler::set_config(...) — affects subsequent calls from the current thread.

Fields

trace_threshold: u32

Backedges through a loop header before recording arms.

block_threshold: u32

Whole-chunk invocations before the block JIT compiles a chunk. Below this, try_run_block returns None and the caller falls back to the interpreter — avoiding compile cost for one-shot chunks. Defaults to 1 (compile on the 2nd invocation) so re-run-heavy workloads reach native code fast; raise it for cold-start scripts that run once, or override per-process with FUSEVM_JIT_BLOCK_THRESHOLD.

max_side_exits: u32

Mid-trace side-exits before the trace is auto-blacklisted.

max_inline_recursion: usize

Maximum self-recursive levels the recorder will inline.

max_trace_chain: usize

Maximum chained side traces dispatched per backward-branch hop.

max_trace_len: usize

Maximum recorded ops in a single trace before recording aborts.

Implementations

impl TraceJitConfig

pub const fn defaults() -> Self

Defaults matching the phase-1-through-9 constants, except block_threshold which defaults to 1 (compile on the 2nd invocation) to favor re-run-heavy workloads. Per-process env overrides (FUSEVM_JIT_BLOCK_THRESHOLD / FUSEVM_JIT_TRACE_THRESHOLD) are applied on top of these when a thread first touches the JIT.

Trait Implementations

impl Clone for TraceJitConfig

fn clone(&self) -> TraceJitConfig

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for TraceJitConfig

impl Debug for TraceJitConfig

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for TraceJitConfig

fn default() -> Self

Returns the “default value” for a type.