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bench: use seeded RNG for deterministic benchmark results

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Replace thread_rng() with StdRng::seed_from_u64() to ensure benchmarks
use the same random inputs across runs, eliminating variance from
different random numbers having vastly different primality testing times.
This commit is contained in:
Sylvestre Ledru
2026-02-19 22:04:23 +01:00
parent e1700693ea
commit 3dfc6debc3
1 changed files with 6 additions and 4 deletions
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bench/benches/bench.rs
+6 -4
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@@ -8,6 +8,8 @@ use num_bigint::RandBigInt;
use num_prime::{nt_funcs, RandPrime};
#[cfg(feature = "num-primes")]
use num_primes::{Generator, Verification};
use rand::rngs::StdRng;
use rand::SeedableRng;
#[cfg(target_arch = "x86_64")]
use number_theory::NumberTheory;
@@ -51,7 +53,7 @@ pub fn bench_is_prime(c: &mut Criterion) {
////// 256 bits Bigint /////
let mut rng = rand::thread_rng();
let mut rng = StdRng::seed_from_u64(42);
let numbers: Vec<_> = repeat_with(|| rng.gen_biguint(256)).take(32).collect();
let mut group = c.benchmark_group("primality check (u256)");
@@ -117,7 +119,7 @@ pub fn bench_is_prime(c: &mut Criterion) {
////// 2048 bits Bigint /////
let mut rng = rand::thread_rng();
let mut rng = StdRng::seed_from_u64(123);
let numbers: Vec<_> = repeat_with(|| rng.gen_biguint(2048)).take(8).collect();
let mut group = c.benchmark_group("primality check (u2048)");
@@ -215,7 +217,7 @@ pub fn bench_prime_gen(c: &mut Criterion) {
let mut group = c.benchmark_group("prime generation (256 bits)");
group.sample_size(10).sampling_mode(SamplingMode::Flat);
let mut rng = rand::thread_rng();
let mut rng = StdRng::seed_from_u64(256);
group.bench_function("num-prime (this crate)", |b| {
b.iter(|| -> num_bigint::BigUint { rng.gen_prime(256, None) })
});
@@ -226,7 +228,7 @@ pub fn bench_prime_gen(c: &mut Criterion) {
let mut group = c.benchmark_group("safe prime generation (256 bits)");
group.sample_size(10).sampling_mode(SamplingMode::Flat);
let mut rng = rand::thread_rng();
let mut rng = StdRng::seed_from_u64(512);
group.bench_function("num-prime (this crate)", |b| {
b.iter(|| -> num_bigint::BigUint { rng.gen_safe_prime(256) })
});