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// Flags: --expose-gc
'use strict';
const common = require('../common');
const assert = require('assert');
const {
PerformanceObserver,
constants
} = require('perf_hooks');
const {
NODE_PERFORMANCE_GC_MAJOR,
NODE_PERFORMANCE_GC_MINOR,
NODE_PERFORMANCE_GC_INCREMENTAL,
NODE_PERFORMANCE_GC_WEAKCB
} = constants;
const kinds = [
NODE_PERFORMANCE_GC_MAJOR,
NODE_PERFORMANCE_GC_MINOR,
NODE_PERFORMANCE_GC_INCREMENTAL,
NODE_PERFORMANCE_GC_WEAKCB
];
// Adding an observer should force at least one gc to appear
{
const obs = new PerformanceObserver(common.mustCallAtLeast((list) => {
const entry = list.getEntries()[0];
assert(entry);
assert.strictEqual(entry.name, 'gc');
assert.strictEqual(entry.entryType, 'gc');
assert(kinds.includes(entry.kind));
assert.strictEqual(typeof entry.startTime, 'number');
assert.strictEqual(typeof entry.duration, 'number');
obs.disconnect();
}));
obs.observe({ entryTypes: ['gc'] });
global.gc();
// Keep the event loop alive to witness the GC async callback happen.
setImmediate(() => setImmediate(() => 0));
}
// GC should not keep the event loop alive
{
let didCall = false;
process.on('beforeExit', () => {
assert(!didCall);
didCall = true;
global.gc();
});
}