[android-developers] Re: General lag issues with real-time games

There's nothing in what you describe to suggest it's the GC in other
processes.

GC is just a component of what happens in a process -- and it's always
a side-effect of the process doing other things.

You're probably right in that it's other processes, but wrong to pin
it specifically on the GC.

It's possible, however, for the GC to happen in a bigger chunk than
the series of short executions that eventually trigger it. So the GC
may contribute to the minimum size of a lag. Even then, it's not
useful to focus on GC as the cause, as neither you nor your users have
any control over the GC behavior of someone else's application.

On Mar 13, 7:44 pm, markusn82 <markus...@gmail.com> wrote:
> I developed and published a game about two months ago. Since then,
> I've received several negative comments about input lag in the game.
> Before releasing the game, I already took several measures to
> hopefully prevent lag from occurring:
>
> 1) Game is almost entirely written in native code
> 2) After initialization, my process never invokes the GC during
> gameplay (no GC executions from my process show up in the log)
> 3) Average FPS is generally > 30 fps
> 4) I tested the game on both a Motorola Milestone and an HTC Magic and
> I don't experience any noticeable input lag (except perhaps when the
> GC is executed by other processes)
>
> My guess is that the lag that users are experiencing is a result of
> the GC being invoked by another process. Has anyone been able to
> address this issue? Specifically, have any game developers been able
> to achieve a completely lag-free game and thus avoid negative ratings
> that drag down your app?
>
> The only other suspicious thing I've noticed is the following lines
> showing up in my log any time a SoundPool clip is played:
>
> D/AudioHardwareMot( 1054): AudioMgr:AudioStreamOutMot::standby called
> D/AudioHardwareMot( 1054): AudioMgr:Output 0xb538 entering standby
> D/AudioHardwareMot( 1054): AudioMgr:Closing stereo device
> D/AudioHardwareMot( 1054): AudioMgr:Output 0xb538 exiting standby
>
> Any ideas or suggestions?
>
> Thanks

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