1 unstable release
0.1.0 | Oct 28, 2024 |
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#40 in Profiling
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90KB
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SLoC
Yet Another Benchmarking framework powered by cachegrind
YAB is Yet Another Benchmarking framework powered by cachegrind
from the Valgrind tool suite.
It collects reproducible measurements of Rust code (e.g., the number of executed instructions,
number of L1 and L2/L3 cache hits and RAM accesses), making it possible to use in CI etc.
Features
- Supports newer
cachegrind
versions and customizing thecachegrind
wrapper. - Supports capturing only instruction counts (i.e., not simulating CPU caches).
- Conditionally injects
CACHEGRIND_{START|STOP}_INSTRUMENTATION
macros (available incachegrind
3.22.0+) allowing for more precise measurements. - Supports configurable warm-up (defined in terms of executed instructions) before the capture.
Usage
Define a benchmark binary and include it into your crate manifest:
[dev-dependencies]
yab = "0.1.0"
[[bench]]
name = "your_bench"
harness = false
In the bench source (benches/your_bench.rs
in the example above), define a function with signature fn(&mut yab::Bencher)
and wrap it in the yab::main!
macro:
use yab::Bencher;
fn benchmarks(bencher: &mut Bencher) {
// define your benchmarking code here
}
yab::main!(benchmarks);
Run benchmarks as usual using cargo bench
(or cargo test --bench ...
to test them).
Configuration options
Run cargo bench ... -- --help
to get help on the supported configuration options. Some of the
common options are:
--list
: lists benchmarks without running them.--print
: prints results of the latest run instead of running benchmarks.--jobs N
/-j N
: specifies the number of benchmarks to run in parallel. By default, it's equal to the number of logical CPUs in the system.--verbose
,--quiet
: increases or decreases verbosity of benchmarking output.
Examples
use yab::{black_box, Bencher, BenchmarkId};
/// Suppose we want to benchmark this function
fn fibonacci(n: u64) -> u64 {
match n {
0 | 1 => 1,
n => fibonacci(n - 1) + fibonacci(n - 2),
}
}
fn benchmarks(bencher: &mut Bencher) {
// Benchmark simple functions.
bencher
.bench("fib_short", || fibonacci(black_box(10)))
.bench("fib_long", || fibonacci(black_box(30)));
// It's possible to benchmark parametric functions as well:
for n in [15, 20, 25] {
bencher.bench(
BenchmarkId::new("fib", n),
|| fibonacci(black_box(n)),
);
}
// To account for setup and/or teardown, you may use `bench_with_capture`
bencher.bench_with_capture("fib_capture", |capture| {
// This will not be included into captured stats.
black_box(fibonacci(black_box(30)));
// This will be the only captured segment.
let output = capture.measure(|| fibonacci(black_box(10)));
// This assertion won't be captured either
assert_eq!(output, 55);
});
}
yab::main!(benchmarks);
Here's sample benchmark output:
More verbose output with --verbose
option also showcasing changes to the benchmarked function:
Limitations
cachegrind
has somewhat limited platform support (e.g., doesn't support Windows).cachegrind
uses simplistic / outdated CPU cache simulation to the point that recent versions disable this simulation altogether by default.cachegrind
has limited support when simulating multi-threaded environment.- Even small changes in the benchmarked code can lead to (generally small) divergences in the measured stats.
Alternatives and similar tools
- This crate is heavily inspired by
iai
, the originalcachegrind
-based benchmarking framework for Rust. iai-callgrind
is an extended / reworked fork ofiai
. Compared to it,yab
prefers simplicity to versatility.- Benchmarking APIs are inspired by
criterion
.
License
Licensed under either of Apache License, Version 2.0 or MIT license at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in yab
by you, as defined in the Apache-2.0 license,
shall be dual licensed as above, without any additional terms or conditions.
Dependencies
~3–11MB
~145K SLoC