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Rockbox mail archiveSubject: Re: Profiling the codecsRe: Profiling the codecs
From: Tomasz Malesinski <tmal_at_mimuw.edu.pl>
Date: Sun, 4 Feb 2007 20:01:50 +0100 > I notice that on mpa 5.7 and on vorbis a whopping 7.3% of CPU time is > spent in switch_thread. Can you by chance try turning off priority > scheduling and see how that impacts those percentages? That seems like > an awefully high scheduling overhead. I tried switching off HAVE_PRIORITY_SCHEDULING in firmware/export/config.h and it doesn't make a big difference. With mp3 playing, the number of cycles spent in switch_thread decreased from 14.5M to 13.5M. When I slowed down the audio DMA in the emulator, so that the codec thread had to wait once in a while for space in the audio buffer, the number of cycles spent in switch_thread increased to 36M with no priority scheduling and 41M with it. My benchmark is simply the boot process and playing 5s of audio (it happens automaticaly, I play the song instead of calling browse_root in apps/main.c). I haven't traced where most of switch_thread calls come from. -- Tomek MalesinskiReceived on 2007-02-04 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |