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if (window.jstestdriver) {
jstd = jstestdriver;
dump = bind(jstd.console, jstd.console.log);
}
function time(fn) {
var count = 1,
targetTime = 500,
start = new Date().getTime(),
stop = start + targetTime,
elapsed,
end,
iterations,
pad = angularFilter.number;
// do one iteration to guess how long it will take
fn();
while((end=new Date().getTime()) < stop ){
// how much time has elapsed since we started the test
elapsed = (end-start) || 1;
// guess how many more iterations we need before we reach
// the time limit. We do this so that we spend most of our
// time in tight loop
iterations = Math.ceil(
// how much more time we need
(targetTime - elapsed)
/
2 // to prevent overrun guess low
/
// this is how much the cost is so far per iteration
(elapsed / count)
);
count += iterations;
while(iterations--) {
fn();
}
}
elapsed = end - start;
return {
count: count,
total: elapsed,
time: elapsed / count,
name: fn.name,
msg: '' + pad(elapsed / count, 3)
+ ' ms [ ' + pad(1 / elapsed * count * 1000, 0) + ' ops/sec ] '
+ '(' + elapsed + ' ms/' + count + ')'
};
}
function perf() {
var log = [],
summary = [],
i,
baseline,
pad = angularFilter.number;
for (i = 0; i < arguments.length; i++) {
var fn = arguments[i];
var info = time(fn);
if (baseline === undefined) baseline = info.time;
summary.push(info.name + ': ' + pad(baseline / info.time, 2) + ' X');
log.push('\n ' + info.name + ': ' + info.msg);
}
log.unshift(summary.join(' - '));
dump(log.join(' '));
}
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