How can I profile my Android app?

I need to find where the bottlenecks are in my Android app.

What profiling tools or techniques can I use?

Answers


You can use Traceview. It is far from ideal, but works. This article describes how to use it.


DDMS is the best for Android. By default it get included with the ADT plugin.

This document with detailed example should help you to deal with DDMS.


For memory Analysis, try Eclipse MAT


It depends what're you going to test.

In case you develop applications for Android you should try out the TimingLogger class. Take a look at this article describing the usage of the TimingLogger helper class.

A very good tool is JMeter and there is a plugin for Android as well.

if you don't want to use external tools, but a very standard way, to measure elapsed time, you must use System.nanoTime(). You shouldn't use currentTimeMillis, because it measures wall-clock time ans, as no computer's clock is perfect (them all occasionally needs to be corrected) there's a process that runs and continually issues small corrections to the system clock. Not to mention the leap second correction.

Although currentTimeMillis is often used, it's still incorrect to measure elapsed time and timing. Anyhow, as the invocation takes some time, you should not expect to correctly time very very small intervals. But that shouldn't be an issue working with Android.

I'll show you an example:

long startTime = System.nanoTime();

// run/call the method

long endTime = System.nanoTime();
long diff = endTime - startTime ;
System.out.println("Elapsed milliseconds: " + diff /1000000);

You could have a look at this free library as well: http://jetm.void.fm/ .

You can also find tutorial for JMeter as well.


Another tool recommended in http://developer.android.com/training/articles/perf-tips.html is Caliper: https://code.google.com/p/caliper/. (I haven't used it, so I don't know much about it.)


Need Your Help

tmux: hangs and do not load, and do not respond to any option command

linux tmux

I have installed tmux from source on my localspace in Fedora. It was working nicely so far. But suddenly can not run it anymore, when run tmux, it just halts. Tried different command options like ls-

Weighted random selection with and without replacement

python algorithm random random-sample

Recently I needed to do weighted random selection of elements from a list, both with and without replacement. While there are well known and good algorithms for unweighted selection, and some for