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FsdpMemoryAnalyzer

trustformers_optim::fsdp

Struct FsdpMemoryAnalyzer

pub struct FsdpMemoryAnalyzer;

Expand description

Memory analyzer for FSDP configurations.

Provides estimates of peak per-rank memory and ratio vs DDP baseline.

Implementations§

impl FsdpMemoryAnalyzer

pub fn peak_memory(config: &FsdpConfig, total_params: usize) -> usize

Estimate peak memory per rank in bytes.

Assumes f32 (4 bytes/param) and Adam optimizer (2× param bytes for m and v). Uses FullShard accounting by default:

param_bytes / world_size + grad_bytes / world_size + opt_bytes / world_size

pub fn memory_vs_ddp_ratio(world_size: usize) -> f32

Ratio of per-rank memory vs DDP (no sharding) baseline.

Returns a value in (0.0, 1.0] where 1.0 means same as DDP and 1/world_size means maximum reduction from FullShard.

Auto Trait Implementations§

impl Freeze for FsdpMemoryAnalyzer

impl RefUnwindSafe for FsdpMemoryAnalyzer

impl Send for FsdpMemoryAnalyzer

impl Sync for FsdpMemoryAnalyzer

impl Unpin for FsdpMemoryAnalyzer

impl UnsafeUnpin for FsdpMemoryAnalyzer

impl UnwindSafe for FsdpMemoryAnalyzer

Blanket Implementations§

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