Is it possible to limit the number of iterations that Criterion performs?

Question

I am developing some benchmarks for a crate using criterion (cargo bench). I would like to temporarily limit the amount of iterations until I finish the code.

I know measurements may not be precise, but this is just temporary. Is this possible?

Answer 1

It is possible.

Look at the Criterion Benchmark. There you can find methods relevant to you, specifically measurement_time .

Digging deeper, you can find how to use them here:

fn bench(c: &mut Criterion) {
    // Setup (construct data, allocate memory, etc)
    c.bench(
        "routines",
        Benchmark::new("routine_1", |b| b.iter(|| routine_1()))
            .with_function("routine_2", |b| b.iter(|| routine_2()))
            .measurement_time(Duration::from_millis(1000))
    );
}

criterion_group!(benches, bench);
criterion_main!(benches);

Where measurement_time(Duration::from_millis(1000)) is the droid you're looking for. This effectively dropped the number of iterations for my specific function by 80%.