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ba4847e879
This commit adds support for trace-event tracing to Node.js. It provides a mechanism to centralize tracing information generated by V8, Node core, and userspace code. It includes: - A trace writer responsible for serializing traces and cycling the output files so that no individual file becomes to large. - A buffer for aggregating traces to allow for batched flushes. - An agent which initializes the tracing controller and ensures that trace serialization is done on a separate thread. - A set of macros for generating trace events. - Tests and documentation. Author: Raymond Kang <raymondksi@gmail.com> Author: Kelvin Jin <kelvinjin@google.com> Author: Matthew Loring <mattloring@google.com> Author: Jason Ginchereau <jasongin@microsoft.com> PR-URL: https://github.com/nodejs/node/pull/9304 Reviewed-By: Trevor Norris <trev.norris@gmail.com> Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com> Reviewed-By: Josh Gavant <josh.gavant@outlook.com>
36 lines
1.2 KiB
JavaScript
36 lines
1.2 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 = 'for (var i = 0; i < 100000; i++) { "test" + i }';
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const FILE_NAME = 'node_trace.1.log';
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common.refreshTmpDir();
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process.chdir(common.tmpDir);
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const proc_no_categories = cp.spawn(process.execPath,
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[ '--trace-events-enabled', '--trace-event-categories', '""', '-e', CODE ]);
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proc_no_categories.once('exit', common.mustCall(() => {
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assert(!common.fileExists(FILE_NAME));
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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, (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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// Values that should be present on all runs to approximate correctness.
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assert(traces.some((trace) => { return trace.pid === proc.pid; }));
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assert(traces.some((trace) => { return trace.cat === 'v8'; }));
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assert(traces.some((trace) => {
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return trace.name === 'V8.ScriptCompiler';
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}));
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});
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}));
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}));
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