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ThreadTime

vector::cpu_time

Struct ThreadTime 

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pub struct ThreadTime(/* private fields */);
Expand description

An opaque snapshot of thread CPU time.

On Linux and macOS this uses CLOCK_THREAD_CPUTIME_ID, which measures only the time the calling thread was actually scheduled on a CPU (true CPU time, excluding preemption and context switches to other threads/processes).

On Windows this uses GetThreadTimes, which provides the same guarantee with 100ns granularity.

On other platforms thread CPU time is unavailable; ThreadTime is a no-op that always reports zero elapsed time. The per-component CPU metric is omitted on those platforms (see register_counter) rather than emitted with misleading wall-clock or zero values.

§Usage

Call ThreadTime::now immediately before the work to measure, then call ThreadTime::elapsed immediately after:

ⓘ
let t0 = ThreadTime::now();
do_work();
let cpu_time = t0.elapsed();

§Correctness for sync transforms

This measurement is accurate for crate::transforms::SyncTransform because transform_all is synchronous and non-yielding: between the two measurement points the worker thread runs only transform code, with no .await points that could interleave other tokio tasks.

Implementations§

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impl ThreadTime

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pub fn now() -> Self

Captures the current thread CPU time.

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pub fn elapsed(&self) -> Duration

Returns the CPU time elapsed since this snapshot was taken.

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