[android-developers] Re: System.gc() causing slowdown from the second start of Activity

In fact, traceview seems to report IDENTICAL times absolutely too,
which is strange, because if I use SystemClock.uptimeMillis() for
measurent, then I get higher values. And REALITY shows too that
methods take more time. But traceview reports contain same absolute
values --- I guess because traceview already reduces FPS, so the
results are not credible as absolute values. And as percents, they are
the same.

On Jul 22, 7:29 pm, Tamás Kovács <falcon.firebre...@gmail.com> wrote:
> Do you mean TraceView?
>
> I tried with Debug.startAllocCounting, Debug.startMethodTracking(...),
> made a lot of reports, but the result is the same:
>
> practically same % spent in all methods. Just everything is slower in
> absolute time during the GLSurfaceView rendering.
>
> For example, the GL effects I use take more time, but the distribution
> of method times is exactly the same. To be brief, everything is
> slower, proportionally.
>
> Memory allocation is fine, no leak, no increase in heap...
>
> On Jul 22, 7:17 pm, RichardC <richard.crit...@googlemail.com> wrote:
>
>
>
>
>
>
>
> > Run the profiler.
>
> > On Sunday, July 22, 2012 5:41:55 PM UTC+1, Tamás Kovács wrote:
>
> > > I know that System.gc() is needless and discouraged, and I don't try
> > > to suggest otherwise, but the point is that it shouldn't cause issues
> > > either (i.e. it should be useless at most).
>
> > > If I add the following code to my Activity.onPause(), then my
> > > application will be slow after the second start of the activity:
>
> > > if (isFinishing()) {
> > >     System.gc();
> > > }
>
> > > I.e. the framerate in my GLSurfaceView will be reduced by 50%. If I
> > > remove the System.gc() call, everything is totally fine, no matter how
> > > many times I start the activity again (i.e. start it again after it
> > > was finished()).
>
> > > The relevant source codes here:
>
> > >http://stackoverflow.com/questions/11601914/system-gc-causing-slowdow...
>
> > > Please help! GC is discouraged but shouldn't mess up the View/Layout
> > > destroying system of Android.

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