ratatui/benches/sparkline.rs

use criterion::{criterion_group, criterion_main, Bencher, BenchmarkId, Criterion};
use rand::Rng;
use ratatui::{
    buffer::Buffer,
    layout::Rect,
    widgets::{Sparkline, Widget},
};

/// Benchmark for rendering a sparkline.
fn sparkline(c: &mut Criterion) {
    let mut group = c.benchmark_group("sparkline");
    let mut rng = rand::thread_rng();

    for data_count in [64, 256, 2048] {
        let data: Vec<u64> = (0..data_count)
            .map(|_| rng.gen_range(0..data_count))
            .collect();

        // Render a basic sparkline
        group.bench_with_input(
            BenchmarkId::new("render", data_count),
            &Sparkline::default().data(&data),
            render,
        );
    }

    group.finish();
}

/// render the block into a buffer of the given `size`
fn render(bencher: &mut Bencher, sparkline: &Sparkline) {
    let mut buffer = Buffer::empty(Rect::new(0, 0, 200, 50));
    // We use `iter_batched` to clone the value in the setup function.
    // See https://github.com/ratatui-org/ratatui/pull/377.
    bencher.iter_batched(
        || sparkline.clone(),
        |bench_sparkline| {
            bench_sparkline.render(buffer.area, &mut buffer);
        },
        criterion::BatchSize::LargeInput,
    );
}

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