Re: Timer implementation (time sharing)

real = sum( for all processes, p ){ user(p) + sys(p) };
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Modern computer systems are "time share" systems so the one process you timed isn't the only process getting CPU time. In fact, in the "for all processes", you need to include "the idle 'process'".

- tye

Comment on Re: Timer implementation (time sharing) Download Code

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Re^2: Timer implementation (time sharing) by betterworld (Curate) on Sep 16, 2008 at 12:41 UTC
If you sum over all processes, you'll have to divide the result by the number of CPUs :)	[reply]
Re^2: Timer implementation (time sharing) by bash (Scribe) on Sep 16, 2008 at 02:44 UTC
Oh... i think that i understand now. You want to say, that if my application is sleeping on some kind of I/O system calls then Real Time will be Sys+Real+Sleep_Time?	[reply]