From b96c0a5d892c9280148d8bbe186526157cda4a9f Mon Sep 17 00:00:00 2001 From: "Christoph J. Scherr" Date: Wed, 10 Jan 2024 16:53:47 +0100 Subject: [PATCH] simple benchmarks --- Cargo.lock | 636 +++++++++++++++++- Cargo.toml | 6 +- members/bench-criterion/src/main.rs | 26 - .../Cargo.toml | 10 +- members/criterion_ex/benches/my_benchmark.rs | 9 + members/criterion_ex/src/lib.rs | 8 + members/revsqrt/Cargo.toml | 11 + members/revsqrt/benches/rsqrt-bench.rs | 11 + members/revsqrt/src/lib.rs | 20 + 9 files changed, 705 insertions(+), 32 deletions(-) delete mode 100644 members/bench-criterion/src/main.rs rename members/{bench-criterion => criterion_ex}/Cargo.toml (56%) create mode 100644 members/criterion_ex/benches/my_benchmark.rs create mode 100644 members/criterion_ex/src/lib.rs create mode 100644 members/revsqrt/Cargo.toml create mode 100644 members/revsqrt/benches/rsqrt-bench.rs create mode 100644 members/revsqrt/src/lib.rs diff --git a/Cargo.lock b/Cargo.lock index acb6567..9a0b3ec 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -3,9 +3,643 @@ version = 3 [[package]] -name = 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b/Cargo.toml @@ -1,12 +1,12 @@ [workspace] publish = false members = [ - ".", - "members/bench-criterion", + ".", "members/criterion_ex", + "members/revsqrt", ] default-members = [ ".", - "members/bench-criterion", + "members/revsqrt", ] [package] diff --git a/members/bench-criterion/src/main.rs b/members/bench-criterion/src/main.rs deleted file mode 100644 index f1fe01c..0000000 --- a/members/bench-criterion/src/main.rs +++ /dev/null @@ -1,26 +0,0 @@ -fn main() { - let n: f32 = std::env::args().collect::>()[1] - .parse::() - .expect("bad input number"); - println!("rsqrt:\t\t{}", inverse_sqrt(n)); - println!("f_rsqrt:\t{}", fast_inverse_sqrt(n)); -} - -fn inverse_sqrt(n: f32) -> f32 { - 1f32 / n.sqrt() -} - -union MixedIntFloat { - f: f32, - i: u32, -} - -/// see https://en.wikipedia.org/wiki/Fast_inverse_square_root -fn fast_inverse_sqrt(n: f32) -> f32 { - let mut conv: MixedIntFloat = MixedIntFloat { f: n }; - unsafe { - conv.i = 0x5f3759df - (conv.i >> 1); - conv.f *= 1.5f32 - (n* 0.5f32 * conv.f * conv.f); - conv.f - } -} diff --git a/members/bench-criterion/Cargo.toml b/members/criterion_ex/Cargo.toml similarity index 56% rename from members/bench-criterion/Cargo.toml rename to members/criterion_ex/Cargo.toml index 568036e..72ce45e 100644 --- a/members/bench-criterion/Cargo.toml +++ b/members/criterion_ex/Cargo.toml @@ -1,8 +1,14 @@ [package] -name = "bench-criterion" +name = "criterion_ex" version = "0.1.0" edition = "2021" # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html -[dependencies] +[dev-dependencies] +criterion = "0.5" + +[[bench]] +name = "my_benchmark" +harness = false + diff --git a/members/criterion_ex/benches/my_benchmark.rs b/members/criterion_ex/benches/my_benchmark.rs new file mode 100644 index 0000000..261a7f3 --- /dev/null +++ b/members/criterion_ex/benches/my_benchmark.rs @@ -0,0 +1,9 @@ +use criterion::{black_box, criterion_group, criterion_main, Criterion}; +use criterion_ex::fibonacci; + +pub fn criterion_benchmark(c: &mut Criterion) { + c.bench_function("fib 20", |b| b.iter(|| fibonacci(black_box(20)))); +} + +criterion_group!(benches, criterion_benchmark); +criterion_main!(benches); diff --git a/members/criterion_ex/src/lib.rs b/members/criterion_ex/src/lib.rs new file mode 100644 index 0000000..0472deb --- /dev/null +++ b/members/criterion_ex/src/lib.rs @@ -0,0 +1,8 @@ +#[inline] +pub fn fibonacci(n: u64) -> u64 { + match n { + 0 => 1, + 1 => 1, + n => fibonacci(n-1) + fibonacci(n-2), + } +} diff --git a/members/revsqrt/Cargo.toml b/members/revsqrt/Cargo.toml new file mode 100644 index 0000000..792bb08 --- /dev/null +++ b/members/revsqrt/Cargo.toml @@ -0,0 +1,11 @@ +[package] +name = "revsqrt" +version = "0.1.0" +edition = "2021" + +[dev-dependencies] +criterion = "0.5.1" + +[[bench]] +name = "rsqrt-bench" +harness = false # disable standard harness diff --git a/members/revsqrt/benches/rsqrt-bench.rs b/members/revsqrt/benches/rsqrt-bench.rs new file mode 100644 index 0000000..6f81e90 --- /dev/null +++ b/members/revsqrt/benches/rsqrt-bench.rs @@ -0,0 +1,11 @@ +#![allow(unused)] +use criterion::{black_box, criterion_group, criterion_main, Criterion, BenchmarkId}; +use revsqrt::{inverse_sqrt, fast_inverse_sqrt}; +const SIZE: f32 = 1337.1337; +pub fn criterion_benchmark(c: &mut Criterion) { + c.bench_with_input(BenchmarkId::new("regular rsqrt", SIZE),&SIZE, |b, &s| b.iter(|| inverse_sqrt(s))); + c.bench_with_input(BenchmarkId::new("fast rsqrt", SIZE),&SIZE, |b, &s| b.iter(|| fast_inverse_sqrt(s))); +} + +criterion_group!(benches, criterion_benchmark); +criterion_main!(benches); diff --git a/members/revsqrt/src/lib.rs b/members/revsqrt/src/lib.rs new file mode 100644 index 0000000..43d77f2 --- /dev/null +++ b/members/revsqrt/src/lib.rs @@ -0,0 +1,20 @@ +#[inline] +pub fn inverse_sqrt(n: f32) -> f32 { + 1f32 / n.sqrt() +} + +union MixedIntFloat { + f: f32, + i: u32, +} + +/// see https://en.wikipedia.org/wiki/Fast_inverse_square_root +#[inline] +pub fn fast_inverse_sqrt(n: f32) -> f32 { + let mut conv: MixedIntFloat = MixedIntFloat { f: n }; + unsafe { + conv.i = 0x5f3759df - (conv.i >> 1); + conv.f *= 1.5f32 - (n * 0.5f32 * conv.f * conv.f); + conv.f + } +}