turso/parser/benches/parser_benchmark.rs

use criterion::{black_box, criterion_group, criterion_main, BenchmarkId, Criterion};
use pprof::criterion::{Output, PProfProfiler};
use turso_parser::{lexer::Lexer, parser::Parser};

fn bench_parser(criterion: &mut Criterion) {
    let queries = [
        "SELECT 1",
        "SELECT * FROM users LIMIT 1",
        "SELECT first_name, count(1) FROM users GROUP BY first_name HAVING count(1) > 1 ORDER BY count(1)  LIMIT 1",
    ];

    for query in queries.iter() {
        let mut group = criterion.benchmark_group(format!("Parser `{query}`"));
        let qb = query.as_bytes();

        group.bench_function(BenchmarkId::new("limbo_parser_query", ""), |b| {
            b.iter(|| Parser::new(black_box(qb)).next().unwrap());
        });

        group.finish();
    }
}

fn bench_parser_insert_batch(criterion: &mut Criterion) {
    for batch_size in [1, 10, 100] {
        let mut values = String::from("INSERT INTO test VALUES ");
        for i in 0..batch_size {
            if i > 0 {
                values.push(',');
            }
            values.push_str(&format!("({}, '{}')", i, format_args!("value_{i}")));
        }

        let mut group = criterion.benchmark_group(format!("Parser insert batch `{values}`"));
        let qb = values.as_bytes();

        group.bench_function(BenchmarkId::new("limbo_parser_insert_batch", ""), |b| {
            b.iter(|| Parser::new(black_box(qb)).next().unwrap());
        });

        group.finish();
    }
}

fn bench_lexer(criterion: &mut Criterion) {
    let queries = [
        "SELECT 1",
        "SELECT * FROM users LIMIT 1",
        "SELECT first_name, count(1) FROM users GROUP BY first_name HAVING count(1) > 1 ORDER BY count(1)  LIMIT 1",
    ];

    for query in queries.iter() {
        let mut group = criterion.benchmark_group(format!("Lexer `{query}`"));
        let qb = query.as_bytes();

        group.bench_function(BenchmarkId::new("limbo_lexer_query", ""), |b| {
            b.iter(|| {
                for token in Lexer::new(black_box(qb)) {
                    token.unwrap();
                }
            });
        });

        group.finish();
    }
}

criterion_group! {
    name = benches;
    config = Criterion::default().with_profiler(PProfProfiler::new(100, Output::Flamegraph(None)));
    targets = bench_parser, bench_parser_insert_batch, bench_lexer
}
criterion_main!(benches);