plonky2/benches/transpose.rs

use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion};
use plonky2::field::field_types::Field;
use plonky2::field::goldilocks_field::GoldilocksField;
use plonky2::util::transpose;

fn criterion_benchmark(c: &mut Criterion) {
    type F = GoldilocksField;

    // In practice, for the matrices we care about, each row is associated with a polynomial of
    // degree 2^13, and has been low-degree extended to a length of 2^16.
    const WIDTH: usize = 1 << 16;

    let mut group = c.benchmark_group("transpose");

    // We have matrices with various numbers of polynomials. For example, the witness matrix
    // involves 100+ polynomials.
    for height in [5, 50, 100, 150] {
        group.bench_with_input(BenchmarkId::from_parameter(height), &height, |b, _| {
            let matrix = (0..height).map(|_| F::rand_vec(WIDTH)).collect::<Vec<_>>();
            b.iter(|| transpose(&matrix));
        });
    }
}

criterion_group!(benches, criterion_benchmark);
criterion_main!(benches);