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denoland-deno/ext/node/benchmarks/child_process_ipc.mjs

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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { fork } from "node:child_process";
import process from "node:process";
import { setImmediate } from "node:timers";
if (process.env.CHILD) {
const len = +process.env.CHILD;
const msg = ".".repeat(len);
let waiting = false;
const send = () => {
while (
process.send(msg, undefined, undefined, (_e) => {
if (waiting) {
waiting = false;
setImmediate(send);
}
})
);
// Wait: backlog of unsent messages exceeds threshold
// once the message is sent, the callback will be called
// and we'll resume
waiting = true;
};
send();
} else {
function main(dur, len) {
const p = new Promise((resolve) => {
const start = performance.now();
const options = {
__proto__: null,
"stdio": ["inherit", "inherit", "inherit", "ipc"],
"env": { "CHILD": len.toString() },
};
const path = new URL("child_process_ipc.mjs", import.meta.url).pathname;
const child = fork(
path,
options,
);
let bytes = 0;
let total = 0;
child.on("message", (msg) => {
bytes += msg.length;
total += 1;
});
setTimeout(() => {
child.kill();
const end = performance.now();
const mb = bytes / 1024 / 1024;
const sec = (end - start) / 1000;
const mbps = mb / sec;
console.log(`${len} bytes: ${mbps.toFixed(2)} MB/s`);
console.log(`${total} messages`);
resolve();
}, dur * 1000);
});
return p;
}
const len = [
64,
256,
1024,
4096,
16384,
65536,
65536 << 4,
65536 << 6 - 1,
];
for (const l of len) {
await main(5, l);
}
}