You can try this code .. let me know if u find any issues with it....
/* bind - simple command-line tool to set CPU
* affinity of a given task
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <sched.h>
int main(int argc, char *argv[])
{
cpu_set_t new_mask;
cpu_set_t cur_mask;
unsigned int len = sizeof(new_mask);
pid_t pid;
if (argc != 3) {
fprintf(stderr,
"usage: %s [pid] [cpu_mask]\n",
argv[0]);
return -1;
}
pid = atol(argv[1]);
if (sched_getaffinity(pid, len,
&cur_mask) < 0) {
perror("sched_getaffinity");
return -1;
}
printf("pid %d's %08lx\n",
pid, cur_mask);
CPU_ZERO(&new_mask);
CPU_SET(atoi(argv[2]), &new_mask);
if (sched_setaffinity(pid, len, &new_mask)) {
perror("sched_setaffinity");
return -1;
}
if (sched_getaffinity(pid, len,
&cur_mask) < 0) {
perror("sched_getaffinity");
return -1;
}
printf(" pid %d's new affinity: %08lx\n",
pid, cur_mask);
return 0;
}
-Vinit
On Fri, Jul 31, 2009 at 1:42 AM, Vipul Jain <vipulsj@xxxxxxxxx> wrote:
Hi All,
I am trying to compile the cpu affinity tool written by Robert love present at the below link:
http://www.linuxjournal.com/files/linuxjournal.com/linuxjournal/articles/067/6799/6799l1.html
But if I try to compile the program its giving me following error:
vipul@ubuntu:~/linux$ cc -o bind bind.c
bind.c: In function `main':
bind.c:29: warning: passing arg 3 of `sched_getaffinity' from incompatible pointer type
bind.c:37: warning: passing arg 3 of `sched_setaffinity' from incompatible pointer type
bind.c:42: warning: passing arg 3 of `sched_getaffinity' from incompatible pointer type
I am not sure why? (looking at his explanation and code things look perfect).
http://www.linuxjournal.com/files/linuxjournal.com/linuxjournal/articles/067/6799
Also, Second thing he mentions sched_get/setaffinity takes three args but after doing the cscope
in kernel source I found that its taking 2 args only.
[cut from kernel/sched.c]
long sched_getaffinity(pid_t pid, struct cpumask *mask)
I was wondering if any body could please help me with this issue, would like to run this tool and
set/check cpu affinity.
Regards,
Vipul.
