telemetry.js - mozsearch

Enable keyboard shortcuts

// Test GC telemetry.

gczeal(0);

gcparam('perZoneGCEnabled', 1);

gcparam('incrementalGCEnabled', 1);

gc();

function runAndGetTelemetry(probe, thunk) {

  startRecordingTelemetry(probe);

  thunk();

  let samples = getTelemetrySamples(probe);

  stopRecordingTelemetry(probe);

  return samples;

function checkTelemetry(probe, expected, thunk) {

  let samples = runAndGetTelemetry(probe, thunk);

  assertEq(samples.length, 1);

  assertEq(samples[0], expected);

function incrementalGC() {

  startgc(1);

  while (gcstate() != 'NotActive') {

    gcslice(10000);

checkTelemetry('GC_IS_COMPARTMENTAL', 0, () => gc());

checkTelemetry('GC_IS_COMPARTMENTAL', 1, () => gc(this));

// By default there are two zones, the one for |this| and this atoms zone.

checkTelemetry('GC_ZONE_COUNT', 2, () => gc());

checkTelemetry('GC_ZONES_COLLECTED', 2, () => gc());

checkTelemetry('GC_ZONES_COLLECTED', 1, () => gc(this));

checkTelemetry('GC_RESET', 0, () => gc());

checkTelemetry('GC_RESET', 0, () => { startgc(1); finishgc(); });

checkTelemetry('GC_RESET', 1, () => { startgc(1); abortgc(); });

checkTelemetry('GC_NON_INCREMENTAL', 1, () => gc());

checkTelemetry('GC_NON_INCREMENTAL', 1, () => { startgc(1); abortgc(); });

checkTelemetry('GC_NON_INCREMENTAL', 0, () => { startgc(1); finishgc(); });

checkTelemetry('GC_NON_INCREMENTAL', 0, () => incrementalGC());

// GC_SLICE_COUNT is not reported for non-incremental GCs.

let samples = runAndGetTelemetry('GC_SLICE_COUNT', () => gc());

assertEq(samples.length, 0);

checkTelemetry('GC_SLICE_COUNT', 2, () => { startgc(1); finishgc(); });