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32873c5f9b
V8 uses a thread pool provided by the host to schedule background tasks for concurrent GC and compiation. Emit trace events to identify the background threads. Ensure that the tracing infrastructure is started before the thread pool is initialized. PR-URL: https://github.com/nodejs/node/pull/20823 Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
30 lines
1.0 KiB
JavaScript
30 lines
1.0 KiB
JavaScript
'use strict';
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const common = require('../common');
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const assert = require('assert');
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const cp = require('child_process');
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const fs = require('fs');
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const CODE =
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'setTimeout(() => { for (var i = 0; i < 100000; i++) { "test" + i } }, 1)';
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const FILE_NAME = 'node_trace.1.log';
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const tmpdir = require('../common/tmpdir');
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tmpdir.refresh();
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process.chdir(tmpdir.path);
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const proc = cp.spawn(process.execPath,
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[ '--trace-events-enabled', '-e', CODE ]);
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proc.once('exit', common.mustCall(() => {
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assert(common.fileExists(FILE_NAME));
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fs.readFile(FILE_NAME, common.mustCall((err, data) => {
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const traces = JSON.parse(data.toString()).traceEvents;
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assert(traces.length > 0);
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assert(traces.some((trace) =>
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trace.cat === '__metadata' && trace.name === 'thread_name' &&
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trace.args.name === 'JavaScriptMainThread'));
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assert(traces.some((trace) =>
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trace.cat === '__metadata' && trace.name === 'thread_name' &&
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trace.args.name === 'BackgroundTaskRunner'));
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}));
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}));
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