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simple benchmarks

This commit is contained in:
Christoph J. Scherr 2024-01-10 16:53:47 +01:00
parent 0fd04c359c
commit b96c0a5d89
Signed by: cscherrNT
GPG Key ID: 8E2B45BC51A27EA7
9 changed files with 705 additions and 32 deletions
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@ -3,9 +3,643 @@
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checksum = "3d6fa32db2bc4a2f5abeacf2b69f7992cd09dca97498da74a151a3132c26befd"
[[package]]
name = "windows_x86_64_gnullvm"
version = "0.52.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1a657e1e9d3f514745a572a6846d3c7aa7dbe1658c056ed9c3344c4109a6949e"
[[package]]
name = "windows_x86_64_msvc"
version = "0.52.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "dff9641d1cd4be8d1a070daf9e3773c5f67e78b4d9d42263020c057706765c04"

6
Cargo.toml
View File

@ -1,12 +1,12 @@
[workspace]
publish = false
members = [
".",
"members/bench-criterion",
".", "members/criterion_ex",
"members/revsqrt",
]
default-members = [
".",
"members/bench-criterion",
"members/revsqrt",
]
[package]

26
members/bench-criterion/src/main.rs
View File

@ -1,26 +0,0 @@
fn main() {
let n: f32 = std::env::args().collect::<Vec<String>>()[1]
.parse::<f32>()
.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
}
}

10
members/bench-criterion/Cargo.toml → members/criterion_ex/Cargo.toml
View File

@ -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

9
members/criterion_ex/benches/my_benchmark.rs Normal file
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@ -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);

8
members/criterion_ex/src/lib.rs Normal file
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@ -0,0 +1,8 @@
#[inline]
pub fn fibonacci(n: u64) -> u64 {
match n {
0 => 1,
1 => 1,
n => fibonacci(n-1) + fibonacci(n-2),
}
}

11
members/revsqrt/Cargo.toml Normal file
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@ -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

11
members/revsqrt/benches/rsqrt-bench.rs Normal file
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@ -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);

20
members/revsqrt/src/lib.rs Normal file
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@ -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
}
}