/**
* Exercises change detection in a loop and then prints the average amount of
* time in milliseconds how long a single round of change detection takes for
* the current state of the UI. It runs a minimum of 5 rounds for a minimum
* of 500 milliseconds.
*
* Optionally, a user may pass a `config` parameter containing a map of
* options. Supported options are:
*
* `record` (boolean) - causes the profiler to record a CPU profile while
* it exercises the change detector. Example:
*
* ```
* ng.profiler.timeChangeDetection({record: true})
* ```
*/
timeChangeDetection(config) {
var record = isPresent(config) && config['record'];
var profileName = 'Change Detection';
// Profiler is not available in Android browsers, nor in IE 9 without dev tools opened
var isProfilerAvailable = isPresent(window.console.profile);
if (record && isProfilerAvailable) {
window.console.profile(profileName);
}
var start = DOM.performanceNow();
var numTicks = 0;
while (numTicks < 5 || (DOM.performanceNow() - start) < 500) {
this.appRef.tick();
numTicks++;
}
var end = DOM.performanceNow();
if (record && isProfilerAvailable) {
// need to cast to <any> because type checker thinks there's no argument
// while in fact there is:
//
// https://developer.mozilla.org/en-US/docs/Web/API/Console/profileEnd
window.console.profileEnd(profileName);
}
var msPerTick = (end - start) / numTicks;
window.console.log(`ran ${numTicks} change detection cycles`);
window.console.log(`${NumberWrapper.toFixed(msPerTick, 2)} ms per check`);
return new ChangeDetectionPerfRecord(msPerTick, numTicks);
}
return function() {
window.console.profile(name + ' w GC');
var duration = 0;
var count = 0;
while(count++ < 150) {
gc();
var start = window.performance.now();
create();
duration += window.performance.now() - start;
destroy();
}
window.console.profileEnd(name + ' w GC');
window.console.log(`Iterations: ${count}; time: ${duration / count} ms / iteration`);
window.console.profile(name + ' w/o GC');
duration = 0;
count = 0;
while(count++ < 150) {
var start = window.performance.now();
create();
duration += window.performance.now() - start;
destroy();
}
window.console.profileEnd(name + ' w/o GC');
window.console.log(`Iterations: ${count}; time: ${duration / count} ms / iteration`);
};
export function windowProfileEnd(name) {
window.console.profileEnd(name);
}
export function microBenchmark(name, iterationCount, callback) {
var durationName = `${name}/${iterationCount}`;
window.console.time(durationName);
callback();
window.console.timeEnd(durationName);
}