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ee1c940709
The test-util feature flag is only intended to be used with tests. However, it is possible to enable it in release mode accidentally. This patch reduces the overhead of `Instant::now()` when the `test-util` feature flag is enabled but `time::pause()` is not called. The optimization is implemented by adding a static atomic flag that tracks if `time::pause()` has ever been called. In `Instant::now()`, the atomic flag is first checked before the thread-local and mutex are accessed.
26 lines
628 B
Rust
26 lines
628 B
Rust
//! Benchmark spawning a task onto the basic and threaded Tokio executors.
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//! This essentially measure the time to enqueue a task in the local and remote
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//! case.
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#[macro_use]
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extern crate bencher;
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use bencher::{black_box, Bencher};
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fn time_now_current_thread(bench: &mut Bencher) {
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let rt = tokio::runtime::Builder::new_current_thread()
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.enable_time()
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.build()
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.unwrap();
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bench.iter(|| {
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rt.block_on(async {
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black_box(tokio::time::Instant::now());
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})
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})
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}
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bencher::benchmark_group!(time_now, time_now_current_thread,);
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bencher::benchmark_main!(time_now);
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