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'use strict';
const common = require('../common');
const assert = require('assert');
const util = require('util');
const { Worker } = require('worker_threads');
let numWorkers = +process.env.JOBS || require('os').cpus().length;
if (numWorkers > 20) {
// Cap the number of workers at 20 (as an even divisor of 60 used as
// the total number of workers started) otherwise the test fails on
// machines with high core counts.
numWorkers = 20;
}
// Verify that a Worker's memory isn't kept in memory after the thread finishes.
function run(n, done) {
console.log(`run() called with n=${n} (numWorkers=${numWorkers})`);
if (n <= 0)
return done();
const worker = new Worker(
'require(\'worker_threads\').parentPort.postMessage(2 + 2)',
{ eval: true });
worker.on('message', common.mustCall((value) => {
assert.strictEqual(value, 4);
}));
worker.on('exit', common.mustCall(() => {
run(n - 1, done);
}));
}
const startStats = process.memoryUsage();
let finished = 0;
for (let i = 0; i < numWorkers; ++i) {
run(60 / numWorkers, () => {
console.log(`done() called (finished=${finished})`);
if (++finished === numWorkers) {
const finishStats = process.memoryUsage();
// A typical value for this ratio would be ~1.15.
// 5 as a upper limit is generous, but the main point is that we
// don't have the memory of 50 Isolates/Node.js environments just lying
// around somewhere.
assert.ok(finishStats.rss / startStats.rss < 5,
'Unexpected memory overhead: ' +
util.inspect([startStats, finishStats]));
}
});
}