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/*
* This is a simple addition to allow for higher resolution timers.
* It can be used to track time for both synchronous or asynchronous
* calls. For synchronous calls pass a callback function like so:
*
* var timer = require('./_bench_timer');
*
* timer('myTest', function() {
* for (var i = 0; i < 1e6; i++)
* // ... run something here
* }
* });
*
* For asynchronous timers just pass the name. Then run it again with
* the same name to finish it:
*
* timer('checkAsync');
* setTimeout(function() {
* timer('checkAsync');
* }, 300);
*
* When this happens all currently queued benchmarks will be paused
* until the asynchronous benchmark has completed.
*
* If the benchmark has been run with --expose_gc then the garbage
* collector will be run between each test.
*
* The setTimeout delay can also be changed by passing a value to
* timer.delay.
*/
var store = {};
var order = [];
var maxLength = 0;
var processing = false;
var asyncQueue = 0;
var GCd = typeof gc !== 'function' ? false : true;
function timer(name, fn) {
if (maxLength < name.length)
maxLength = name.length;
if (!fn) {
processing = false;
if (!store[name]) {
asyncQueue++;
store[name] = process.hrtime();
return;
}
displayTime(name, process.hrtime(store[name]));
asyncQueue--;
} else {
store[name] = fn;
order.push(name);
}
if (!processing && asyncQueue <= 0) {
processing = true;
setTimeout(run, timer.delay);
}
}
timer.delay = 100;
function run() {
if (asyncQueue > 0 || order.length <= 0)
return;
if (GCd) gc();
setTimeout(function() {
var name = order.shift();
var fn = store[name];
var ini = process.hrtime();
fn();
ini = process.hrtime(ini);
displayTime(name, ini);
run();
}, timer.delay);
}
function displayTime(name, ini) {
name += ': ';
while (name.length < maxLength + 2)
name += ' ';
console.log(name + '%s \u00b5s',
(~~((ini[0] * 1e6) + (ini[1] / 1e3)))
.toString().replace(/(\d)(?=(\d\d\d)+(?!\d))/g, "$1,"));
}
module.exports = timer;
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