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#!/usr/bin/env node
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 args = require("yargs")
.usage("Usage: $0 [options] [tag1] [tag2]")
.describe("g", "run only benchmarks whose names match this regex")
.alias("g", "grep")
.default("g", ".*")
.describe("i", "skip benchmarks whose names match this regex")
.alias("g", "reject")
.default("i", "^$")
.help('h')
.alias('h', 'help')
.example('$0 0.9.2 0.9.0', 'Compare v0.9.2 with v0.9.0')
.example('$0 0.9.2', 'Compare v0.9.2 with the current working version')
.example('$0', 'Compare the latest tag with the current working version')
.example('$0 -g each', 'only run the each(), eachLimit() and eachSeries() benchmarks')
.example('')
.argv;
var grep = new RegExp(args.g, "i");
var reject = new RegExp(args.i, "i");
var version0 = args._[0] || require("../package.json").version;
var version1 = args._[1] || "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)
.filter(matchesGrep)
.filter(doesNotMatch)
.map(createSuite);
async.eachSeries(suites, runSuite, function () {
var totalTime0 = +totalTime[version0].toPrecision(3);
var totalTime1 = +totalTime[version1].toPrecision(3);
var wins0 = wins[version0];
var wins1 = 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 matchesGrep(suiteConfig) {
return !!grep.exec(suiteConfig.name);
}
function doesNotMatch(suiteConfig) {
return !reject.exec(suiteConfig.name);
}
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.toPrecision(2)) + "ms per run");
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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