Benchmarking programs in Rust
How is it possible to benchmark programs in Rust? For example, how would I get execution time of program in seconds?
Answer
It might be worth noting 2 years later (to help any future Rust programmers who stumble on this page) that there are now tools to benchmark Rust code as a part of one's test suite.
(From the guide link below) Using the #[bench] attribute, one can use the standard Rust tooling to benchmark methods in their code.
extern crate test;
use test::Bencher;
#[bench]
fn bench_xor_1000_ints(b: &mut Bencher) {
b.iter(|| {
// use `test::black_box` to prevent compiler optimizations from disregarding
// unused values
test::black_box(range(0u, 1000).fold(0, |old, new| old ^ new));
});
}
For the command cargo bench this outputs something like:
running 1 test
test bench_xor_1000_ints ... bench: 375 ns/iter (+/- 148)
test result: ok. 0 passed; 0 failed; 0 ignored; 1 measured
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