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torch.js
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torch.js
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#!/usr/bin/env node
// Copyright (c) 2015 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
'use strict';
/* global process, console */
/* eslint-disable no-console, no-process-exit */
var util = require('util');
var stackvis = require('stackvis');
var _ = require('underscore');
var aggregation = require('../lib/aggregation');
var NodeProfiler = require('../lib/node_profiler');
var StackVisAdaptor = require('../lib/stackvis_adaptor');
var Bunyan = require('bunyan');
var VALID_OUTPUT_FORMATS = ['text', 'flame', 'raw'];
var MAX_TIME_SECONDS = 30;
var log = new Bunyan({
'name': 'torch',
'stream': process.stderr
});
// Pretty reasonable... maybe. Not configurable for safety
var MAXACTIONS = 10000;
function die(msg) {
console.error(msg);
process.exit(1);
}
function pidExists(pid) {
// jscs:disable disallowKeywords
try {
process.kill(pid, 0);
} catch (e) {
return false;
}
// jscs:enable disallowKeywords
return true;
}
function usage() {
console.error('Usage: torch <pid> <text|flame|raw> <duration (s)>');
console.error('\ttext: textual flame graph.');
console.error('\tflame: html flame graph.');
console.error('\traw: format suitable for input to FlameGraph tools.');
process.exit(1);
}
function parseArgs(argv) {
if (argv.length !== 5) {
usage();
}
var pid = parseInt(argv[2], 10);
if (_.isNaN(pid)) {
die('Pid must be an integer');
}
var outputFormat = argv[3];
if (!_.contains(VALID_OUTPUT_FORMATS, outputFormat)) {
die('Output format must be "flame," "raw," or "text"');
}
var durationSeconds = parseInt(argv[4], 10);
if (_.isNaN(durationSeconds)) {
die('Duration must be an integer');
}
if (durationSeconds > MAX_TIME_SECONDS) {
die(util.format('Sample for max %ds (for safety).', MAX_TIME_SECONDS));
}
return {
pid: pid,
outputFormat: outputFormat,
durationSeconds: durationSeconds
};
}
function outputText(stacks) {
stacks.forEach(function reverse(stack) {
stack.reverse();
});
console.log(aggregation.aggregate(stacks).display());
}
function outputFlameGraph(stacks) {
/* eslint-disable new-cap */
var reader = new stackvis.readerLookup('dtrace');
var writer = new stackvis.writerLookup('flamegraph-d3');
/* eslint-enable new-cap */
var adaptor = new StackVisAdaptor(stacks);
stackvis.pipeStacks(log, adaptor, reader, writer,
process.stdout, function nop() {});
adaptor.resume();
}
function outputDTraceText(stacks) {
var adaptor = new StackVisAdaptor(stacks);
adaptor.on('data', function outputData(data) {
console.log(data.toString());
});
adaptor.resume();
}
function main() {
var args = parseArgs(process.argv);
if (!pidExists(args.pid)) {
die(util.format('Process %d does not exist.', args.pid));
}
console.error(util.format('Sampling %d for %ds, outputting %s.\n',
args.pid, args.durationSeconds, args.outputFormat));
var profiler = new NodeProfiler(console);
var time = args.durationSeconds * 1000;
profiler.profile(args.pid, time, MAXACTIONS, function done(err, stacks) {
if (err) {
return die('Exiting due to profiling failure.', err);
}
if (args.outputFormat === 'flame') {
outputFlameGraph(stacks);
} else if (args.outputFormat === 'raw') {
outputDTraceText(stacks);
} else {
outputText(stacks);
}
});
}
if (require.main === module) {
process.nextTick(main);
} else {
module.exports = {
parseArgs: parseArgs,
pidExists: pidExists
};
}