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[v12.x backport] worker: add eventLoopUtilization() #37165

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Merged
richardlau merged 2 commits into from
Mar 16, 2021
Merged

[v12.x backport] worker: add eventLoopUtilization() #37165

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eec7542
worker: add eventLoopUtilization()
trevnorris Oct 14, 2020
d7a4ccd
test: correct test-worker-eventlooputil
Flarna Oct 31, 2020
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test: correct test-worker-eventlooputil 
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>

Backport-PR-URL: #37165
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@Flarna @richardlau
Flarna authored and richardlau committed Mar 16, 2021
commit d7a4ccdf098f3a4f233d1c514fff0db3ddf0285a
1 change: 1 addition & 0 deletions test/parallel/test-bootstrap-modules.js
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,7 @@ if (!common.isMainThread) {
expectedModules.add('Internal Binding messaging');
expectedModules.add('Internal Binding symbols');
expectedModules.add('Internal Binding worker');
expectedModules.add('Internal Binding performance');
expectedModules.add('NativeModule _stream_duplex');
expectedModules.add('NativeModule _stream_passthrough');
expectedModules.add('NativeModule _stream_readable');
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18 changes: 8 additions & 10 deletions test/parallel/test-worker-eventlooputil.js
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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