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#!/usr/bin/env node
/**
* Compare the performance of any two tagged versions of async. Can also
* compare any tag with what is in the current working directory.
*
* Usage:
*
* perf/benchmark.js 0.9.2 0.9.0
*
* Compare version 0.9.0 with version 0.9.2
*
* perf/benchmark.js 0.6.0
*
* Compare version 0.6.0 with the current working version
*
* perf/benchmark.js
*
* Compare the current working version with the latest tagged version.
*/
var _ = require("lodash");
var Benchmark = require("benchmark");
var benchOptions = {defer: true, minSamples: 1, maxTime: 2};
var exec = require("child_process").exec;
var fs = require("fs");
var path = require("path");
var mkdirp = require("mkdirp");
var async = require("../");
var suiteConfigs = require("./suites");
var version0 = process.argv[2] || require("../package.json").version;
var version1 = process.argv[3] || "current";
var versionNames = [version0, version1];
var versions;
var wins = {};
var totalTime = {};
totalTime[version0] = wins[version0] = 0;
totalTime[version1] = wins[version1] = 0;
console.log("Comparing " + version0 + " with " + version1);
console.log("--------------------------------------");
async.eachSeries(versionNames, cloneVersion, function (err) {
versions = versionNames.map(requireVersion);
var suites = suiteConfigs
.map(setDefaultOptions)
.reduce(handleMultipleArgs, [])
.map(setName)
.map(createSuite);
async.eachSeries(suites, runSuite, function () {
var totalTime0 = Math.round(totalTime[version0]);
var totalTime1 = Math.round(totalTime[version1]);
var wins0 = Math.round(wins[version0]);
var wins1 = Math.round(wins[version1]);
if ( Math.abs((totalTime0 / totalTime1) - 1) < 0.01) {
// if < 1% difference, we're likely within the margins of error
console.log("Both versions are about equal " +
"(" + totalTime0 + "ms total vs. " + totalTime1 + "ms total)");
} else if (totalTime0 < totalTime1) {
console.log(version0 + " faster overall " +
"(" + totalTime0 + "ms total vs. " + totalTime1 + "ms total)");
} else if (totalTime1 < totalTime0) {
console.log(version1 + " faster overall " +
"(" + totalTime1 + "ms total vs. " + totalTime0 + "ms total)");
}
if (wins0 > wins1) {
console.log(version0 + " won more benchmarks " +
"(" + wins0 + " vs. " + wins1 + ")");
} else if (wins1 > wins0) {
console.log(version1 + " won more benchmarks " +
"(" + wins1 + " vs. " + wins0 + ")");
} else {
console.log("Both versions won the same number of benchmarks " +
"(" + wins0 + " vs. " + wins1 + ")");
}
});
});
function runSuite(suite, callback) {
suite.on("complete", function () {
callback();
}).run({async: true});
}
function setDefaultOptions(suiteConfig) {
suiteConfig.args = suiteConfig.args || [[]];
suiteConfig.setup = suiteConfig.setup || function () {};
return suiteConfig;
}
function handleMultipleArgs(list, suiteConfig) {
return list.concat(suiteConfig.args.map(function (args) {
return _.defaults({args: args}, suiteConfig);
}));
}
function setName(suiteConfig) {
suiteConfig.name = suiteConfig.name + "(" + suiteConfig.args.join(",") + ")";
return suiteConfig;
}
function createSuite(suiteConfig) {
var suite = new Benchmark.Suite();
var args = suiteConfig.args;
function addBench(version, versionName) {
var name = suiteConfig.name + " " + versionName;
suite.add(name, function (deferred) {
suiteConfig.fn(version, function () {
deferred.resolve();
});
}, _.extend({
versionName: versionName,
setup: _.partial.apply(null, [suiteConfig.setup].concat(args))
}, benchOptions));
}
addBench(versions[0], versionNames[0]);
addBench(versions[1], versionNames[1]);
return suite.on('cycle', function(event) {
var mean = event.target.stats.mean * 1000;
console.log(event.target + ", " + mean.toFixed(1) + "ms per sample");
var version = event.target.options.versionName;
totalTime[version] += mean;
})
.on('complete', function() {
var fastest = this.filter('fastest');
if (fastest.length === 2) {
console.log("Tie");
} else {
var winner = fastest[0].options.versionName;
console.log(winner + ' is faster');
wins[winner]++;
}
console.log("--------------------------------------");
});
}
function requireVersion(tag) {
if (tag === "current") {
return async;
}
return require("./versions/" + tag + "/");
}
function cloneVersion(tag, callback) {
if (tag === "current") return callback();
var versionDir = __dirname + "/versions/" + tag;
mkdirp.sync(versionDir);
fs.open(versionDir + "/package.json", "r", function (err, handle) {
if (!err) {
// version has already been cloned
fs.close(handle);
return callback();
}
var repoPath = path.join(__dirname, "..");
var cmd = "git clone --branch " + tag + " " + repoPath + " " + versionDir;
exec(cmd, function (err, stdout, stderr) {
if (err) {
throw err;
}
callback();
});
});
}
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