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test: correct test-worker-eventlooputil
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The active worker check compared the time from sending message till
response arrived from worker with the complete time the worker was
running till it responses to the spin request.

If sending back the message is slow for some reason the test fails.

Adapt the test to compare the time seen inside the worker with the
time read from main thread.

PR-URL: #35891
Fixes: #35844
Refs: #35886
Refs: #35664
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
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Flarna authored and targos committed Nov 4, 2020
1 parent 76ebae4 commit 231af88
Showing 1 changed file with 8 additions and 10 deletions.
18 changes: 8 additions & 10 deletions test/parallel/test-worker-eventlooputil.js
Original file line number Diff line number Diff line change
Expand Up @@ -34,9 +34,10 @@ function workerOnMetricsMsg(msg) {
}

if (msg.cmd === 'spin') {
const elu = eventLoopUtilization();
const t = now();
while (now() - t < msg.dur);
return this.postMessage(eventLoopUtilization());
return this.postMessage(eventLoopUtilization(elu));
}
}

Expand All @@ -50,12 +51,13 @@ let workerELU;
if (eventLoopUtilization().idle <= 0)
return setTimeout(mustCall(r), 5);

mainElu = eventLoopUtilization();

worker = new Worker(__filename, { argv: [ 'iamalive' ] });
metricsCh = new MessageChannel();
worker.postMessage({ metricsCh: metricsCh.port1 }, [ metricsCh.port1 ]);

workerELU = worker.performance.eventLoopUtilization;
mainElu = eventLoopUtilization();
metricsCh.port2.once('message', mustCall(checkWorkerIdle));
metricsCh.port2.postMessage({ cmd: 'elu' });
// Make sure it's still safe to call eventLoopUtilization() after the worker
Expand All @@ -66,15 +68,10 @@ let workerELU;
}));
})();


function checkWorkerIdle(wElu) {
const tmpMainElu = eventLoopUtilization(mainElu);
const perfWorkerElu = workerELU();
const eluDiff = eventLoopUtilization(perfWorkerElu, mainElu);
const tmpMainElu = eventLoopUtilization(mainElu);

assert.strictEqual(idleActive(eluDiff),
(perfWorkerElu.active - mainElu.active) +
(perfWorkerElu.idle - mainElu.idle));
assert.ok(idleActive(wElu) > 0, `${idleActive(wElu)} <= 0`);
assert.ok(idleActive(workerELU(wElu)) > 0,
`${idleActive(workerELU(wElu))} <= 0`);
Expand Down Expand Up @@ -104,8 +101,9 @@ function checkWorkerActive() {
const w2 = workerELU(w);

assert.ok(w2.active >= 50, `${w2.active} < 50`);
assert.ok(idleActive(wElu) > idleActive(w2),
`${idleActive(wElu)} <= ${idleActive(w2)}`);
assert.ok(wElu.active >= 50, `${wElu.active} < 50`);
assert.ok(idleActive(wElu) < idleActive(w2),
`${idleActive(wElu)} >= ${idleActive(w2)}`);

metricsCh.port2.postMessage({ cmd: 'close' });
});
Expand Down

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