[MPlayer-users] does debug compile affect performance?
D Richard Felker III
dalias at aerifal.cx
Mon Sep 8 20:37:38 CEST 2003
On Mon, Sep 08, 2003 at 05:56:10PM +0400, Vladimir Mosgalin wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> On Sun, 7 Sep 2003, D Richard Felker III wrote:
> DRFI>> No. Debug information generates larger binary, but it's separated
> DRFI>> inside the binary file, and when you don't run debugger, it isn't loaded
> DRFI>> at all. In linux, when you run some file, its code isn't just loaded to
> DRFI>> memory; instead, kernel mmaps it. And when no one access debug code,
> DRFI>> kernel doesn't even touch it.
> DRFI>Have you confirmed this in practice? From my experience, programs
> DRFI>compiled with -g always have significantly larger RSS...
> Well, I don't think I looked at RSS, but I can tell you for sure that
> even multimedia programs or games that use all free cpu time run with no
> slowdown at all when compiled with -g; I tested this several times.
> Never checked mplayer, though, but results should be the same. But I
> don't know how exactly MP_DEBUG and -DDEBUG will affect preformance,
> there may be a reason in testing that...
If RSS is bigger, it affects performance by making your system swap!!!
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