CPU Usage profiling

Support
2

Hi Alex,

you can do profiling using the method tracing functionality in ART.

You can add the following code snippet to the beginning of your app, and it will create a sampling based trace of the first 10 seconds of your app’s runtime. Obviously, you can put the start and stop calls where it makes the most sense for you.

        List<NSURL> l = (List<NSURL>) NSFileManager.defaultManager().
                URLsForDirectoryInDomains(
                        NSSearchPathDirectory.DocumentDirectory,
                        NSSearchPathDomainMask.UserDomainMask);
        NSURL docDirURL = l.get(0); // Error handling is for cowards :)
        String fsPath = docDirURL.fileSystemRepresentation();
        System.out.println("Trace log path: " + fsPath);
        Debug.startMethodTracingSampling(fsPath + "/MOE-sampling.trace", 0, 100);
        new Timer().schedule(new TimerTask() {
            @Override
            public void run() {
                Debug.stopMethodTracing();
            }
        }, 10000);

The resulting trace file can be opened from the Android Device Monitor (included in Android Studio): https://developer.android.com/studio/profile/traceview.html

Best Regards,
Gergely

1 Like