deno/tests/testdata/workers/bench_round_robin.ts

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// Benchmark measures time it takes to send a message to a group of workers one
// at a time and wait for a response from all of them. Just a general
// throughput and consistency benchmark.
const data = "HTTP/1.1 200 OK\r\nContent-Length: 12\r\n\r\nHello World\n";
const workerCount = 4;
const cmdsPerWorker = 400;
function handleAsyncMsgFromWorker(
promiseTable: Map<number, ReturnType<typeof Promise.withResolvers<string>>>,
msg: { cmdId: number; data: string },
) {
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const promise = promiseTable.get(msg.cmdId);
if (promise === null) {
throw new Error(`Failed to find promise: cmdId: ${msg.cmdId}, msg: ${msg}`);
}
promise?.resolve(data);
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}
async function main() {
const workers: Array<
[Map<number, ReturnType<typeof Promise.withResolvers<string>>>, Worker]
> = [];
for (let i = 1; i <= workerCount; ++i) {
const worker = new Worker(
import.meta.resolve("./bench_worker.ts"),
{ type: "module" },
);
const { promise, resolve } = Promise.withResolvers<void>();
worker.onmessage = (e) => {
if (e.data.cmdId === 0) resolve();
};
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worker.postMessage({ cmdId: 0, action: 2 });
await promise;
workers.push([new Map(), worker]);
}
// assign callback function
for (const [promiseTable, worker] of workers) {
worker.onmessage = (e) => {
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handleAsyncMsgFromWorker(promiseTable, e.data);
};
}
for (const cmdId of Array(cmdsPerWorker).keys()) {
const promises: Array<Promise<string>> = [];
for (const [promiseTable, worker] of workers) {
const deferred = Promise.withResolvers<string>();
promiseTable.set(cmdId, deferred);
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worker.postMessage({ cmdId: cmdId, action: 1, data });
promises.push(deferred.promise);
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}
for (const promise of promises) {
await promise;
}
}
for (const [, worker] of workers) {
const { promise, resolve } = Promise.withResolvers<void>();
worker.onmessage = (e) => {
if (e.data.cmdId === 3) resolve();
};
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worker.postMessage({ action: 3 });
await promise;
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}
console.log("Finished!");
}
main();