Re: [linux-audio-dev] Pragmatic comparison of approaches to audio engine

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Subject: Re: [linux-audio-dev] Pragmatic comparison of approaches to audio engine
From: Kai Vehmanen (kaiv_AT_wakkanet.fi)
Date: Wed May 16 2001 - 04:04:00 EEST

On Mon, 14 May 2001, Abramo Bagnara wrote:

> Ok, I've finished a new version of ctx.c that complete the picture
> adding multi process approach.

A very quick test run...(2x466):

[ multiprocess - no load ]
|# ./ctx 4 50000 2 467.733
Scheduler set to Round Robin with priority 99...
Cycles per period: 117621.623720
%CPU usage: 18.860379

[ multiprocess - heavy load caused with top+find ]
|# ./ctx 4 50000 2 467.733
Scheduler set to Round Robin with priority 99...
Cycles per period: 185382.758760
%CPU usage: 29.725734

[ singleprocess - heavy load caused with top+find ]
|# ./ctx 4 50000 0 467.733
Scheduler set to Round Robin with priority 99...
Cycles per period: 92924.545520
%CPU usage: 14.900255

[ singleprocess - no load ]
|# ./ctx 4 50000 0 467.733
Scheduler set to Round Robin with priority 99...
Cycles per period: 91563.395720
%CPU usage: 14.681997

... ok, much more thorough testing is needed before making any big
conclusions, but anyway, with this I'd like to emphasize the point that
multiple processes/threads are more fragile under heavy load. 

-- 
 http://www.eca.cx
 Audio software for Linux!

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