linux-kernel - Re: Question about setting affinity in 2.4

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Message-Id: <1171891986.3531.34.camel@laptopd505.fenrus.org>
Date:	Mon, 19 Feb 2007 14:33:06 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Phy Prabab <phyprabab@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Question about setting affinity in 2.4

On Sun, 2007-02-18 at 18:02 -0800, Phy Prabab wrote:
> Hello everyone,
> 
> I am trying to set affinity on a program to make sure I can get the
> best use of the cache as possible and to eliminate as much noise as
> possible with running my program.  I have tried unsuccessfully to set
> affinity using sched_set/getaffinity and the CPU_SET macros.  In
> particular, I can not seem to get the process to use affinity I
> specify as in:
> 
> int main () {
>   cpu_set_t mask;
>   cpu_set_t setmask;
>   long long x;
>   double foo;
>   printf("Mask set to %08lx\n", sched_getaffinity(0, &mask));

       int sched_setaffinity(pid_t pid, unsigned int cpusetsize,
                             cpu_set_t *mask);


sched_setaffinity takes 3 not 2 parameters.



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