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var usage = 'node benchmark/compare.js ' +
'<node-binary1> <node-binary2> ' +
'[--html] [--red|-r] [--green|-g]';
var show = 'both';
var nodes = [];
var html = false;
for (var i = 2; i < process.argv.length; i++) {
var arg = process.argv[i];
switch (arg) {
case '--red': case '-r':
show = show === 'green' ? 'both' : 'red';
break;
case '--green': case '-g':
show = show === 'red' ? 'both' : 'green';
break;
case '--html':
html = true;
break;
case '-h': case '-?': case '--help':
console.log(usage);
process.exit(0);
default:
nodes.push(arg);
break;
}
}
if (!html) {
var start = '';
var green = '\033[1;32m';
var red = '\033[1;31m';
var reset = '\033[m';
var end = '';
} else {
var start = '<pre style="background-color:#333;color:#eee">';
var green = '<span style="background-color:#0f0;color:#000">';
var red = '<span style="background-color:#f00;color:#fff">';
var reset = '</span>';
var end = '</pre>';
}
var runBench = process.env.NODE_BENCH || 'bench';
if (nodes.length !== 2)
return console.error('usage:\n %s', usage);
var spawn = require('child_process').spawn;
var results = {};
var n = 1;
run();
var RUNS = +process.env.NODE_BENCH_RUNS || 1;
var r = RUNS;
function run() {
// Flip back and forth between the two binaries.
if (n === 1) {
n--;
} else {
r--;
if (r === 0)
return compare();
else
n++;
}
if (n === -1)
return compare();
var node = nodes[n];
console.error('running %s', node);
var env = {};
for (var i in process.env)
env[i] = process.env[i];
env.NODE = node;
var child = spawn('make', [runBench], { env: env });
var out = '';
child.stdout.setEncoding('utf8');
child.stdout.on('data', function(c) {
out += c;
});
child.stderr.pipe(process.stderr);
child.on('close', function(code) {
if (code) {
console.error('%s exited with code=%d', node, code);
process.exit(code);
} else {
out.trim().split(/\r?\n/).forEach(function(line) {
line = line.trim();
if (!line)
return;
var s = line.split(':');
var num = +s.pop();
if (!num && num !== 0)
return;
line = s.join(':');
var res = results[line] = results[line] || {};
res[node] = res[node] || [];
res[node].push(num);
});
run();
}
});
}
function compare() {
// each result is an object with {"foo.js arg=bar":12345,...}
// compare each thing, and show which node did the best.
// node[0] is shown in green, node[1] shown in red.
var maxLen = -Infinity;
var util = require('util');
console.log(start);
Object.keys(results).map(function(bench) {
var res = results[bench];
var n0 = avg(res[nodes[0]]);
var n1 = avg(res[nodes[1]]);
var pct = ((n0 - n1) / n1 * 100).toFixed(2);
var g = n0 > n1 ? green : '';
var r = n0 > n1 ? '' : red;
var c = r || g;
if (show === 'green' && !g || show === 'red' && !r)
return;
var r0 = util.format('%s%s: %d%s', g, nodes[0], n0.toPrecision(5), g ? reset : '');
var r1 = util.format('%s%s: %d%s', r, nodes[1], n1.toPrecision(5), r ? reset : '');
var pct = c + pct + '%' + reset;
var l = util.format('%s: %s %s', bench, r0, r1);
maxLen = Math.max(l.length + pct.length, maxLen);
return [l, pct];
}).filter(function(l) {
return l;
}).forEach(function(line) {
var l = line[0];
var pct = line[1];
var dotLen = maxLen - l.length - pct.length + 2;
var dots = ' ' + new Array(Math.max(0, dotLen)).join('.') + ' ';
console.log(l + dots + pct);
});
console.log(end);
}
function avg(list) {
if (list.length >= 3) {
list = list.sort();
var q = Math.floor(list.length / 4) || 1;
list = list.slice(q, -q);
}
return list.reduce(function(a, b) {
return a + b;
}, 0) / list.length;
}
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