deno/bench_util/js_runtime.rs

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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
use bencher::Bencher;
use deno_core::v8;
use deno_core::Extension;
use deno_core::JsRuntime;
use deno_core::PollEventLoopOptions;
use deno_core::RuntimeOptions;
use crate::profiling::is_profiling;
pub fn create_js_runtime(setup: impl FnOnce() -> Vec<Extension>) -> JsRuntime {
JsRuntime::new(RuntimeOptions {
extensions: setup(),
module_loader: None,
..Default::default()
})
}
fn loop_code(iters: u64, src: &str) -> String {
format!(r#"for(let i=0; i < {iters}; i++) {{ {src} }}"#,)
}
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#[derive(Copy, Clone)]
pub struct BenchOptions {
pub benching_inner: u64,
pub profiling_inner: u64,
pub profiling_outer: u64,
}
impl Default for BenchOptions {
fn default() -> Self {
Self {
benching_inner: 1_000,
profiling_inner: 1_000,
profiling_outer: 10_000,
}
}
}
pub fn bench_js_sync(
b: &mut Bencher,
src: &str,
setup: impl FnOnce() -> Vec<Extension>,
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) {
bench_js_sync_with(b, src, setup, Default::default())
}
pub fn bench_js_sync_with(
b: &mut Bencher,
src: &str,
setup: impl FnOnce() -> Vec<Extension>,
opts: BenchOptions,
) {
let mut runtime = create_js_runtime(setup);
let scope = &mut runtime.handle_scope();
// Increase JS iterations if profiling for nicer flamegraphs
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let inner_iters = if is_profiling() {
opts.profiling_inner * opts.profiling_outer
} else {
opts.benching_inner
};
// Looped code
let looped_src = loop_code(inner_iters, src);
let code = v8::String::new(scope, looped_src.as_ref()).unwrap();
let script = v8::Script::compile(scope, code, None).unwrap();
// Run once if profiling, otherwise regular bench loop
if is_profiling() {
script.run(scope).unwrap();
} else {
b.iter(|| {
script.run(scope).unwrap();
});
}
}
pub fn bench_js_async(
b: &mut Bencher,
src: &str,
setup: impl FnOnce() -> Vec<Extension>,
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) {
bench_js_async_with(b, src, setup, Default::default())
}
pub fn bench_js_async_with(
b: &mut Bencher,
src: &str,
setup: impl FnOnce() -> Vec<Extension>,
opts: BenchOptions,
) {
let mut runtime = create_js_runtime(setup);
let tokio_runtime = tokio::runtime::Builder::new_current_thread()
.enable_all()
.build()
.unwrap();
// Looped code
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let inner_iters = if is_profiling() {
opts.profiling_inner
} else {
opts.benching_inner
};
let looped = loop_code(inner_iters, src);
// Get a &'static str by leaking -- this is fine because it's benchmarking code
let src = Box::leak(looped.into_boxed_str());
if is_profiling() {
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for _ in 0..opts.profiling_outer {
tokio_runtime.block_on(inner_async(src, &mut runtime));
}
} else {
b.iter(|| {
tokio_runtime.block_on(inner_async(src, &mut runtime));
});
}
}
async fn inner_async(src: &'static str, runtime: &mut JsRuntime) {
runtime.execute_script("inner_loop", src).unwrap();
runtime
.run_event_loop(PollEventLoopOptions::default())
.await
.unwrap();
}