Revision 846fe60fa6e813437e481877e30d20b248fad74b authored by Roberto Di Cosmo on 28 October 2011, 22:24:05 UTC, committed by Roberto Di Cosmo on 07 November 2011, 20:51:23 UTC
1 parent 2c9e18b
setcore.c
#include <stdio.h>
#include <unistd.h>
//#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <sched.h>
#include <errno.h>
#include <caml/mlvalues.h>
CAMLprim value setcore(value which) {
int numcores = sysconf( _SC_NPROCESSORS_ONLN );
int w = Int_val(which) % numcores; // stay in the space of existing cores
cpu_set_t cpus;
int retcode;
int finished=0;
while (finished==0)
{
CPU_ZERO(&cpus);
CPU_SET (w,&cpus);
fprintf(stderr,"Trying to pin to cpu %d out of %d reported by the system\n",w,numcores);
retcode = sched_setaffinity(getpid(), sizeof(cpu_set_t), &cpus);
if(retcode != 0) {
fprintf(stderr,"Failed pinning to cpu %d, trying %d/2\n",w, w);
w=w/2;
}
else
{ fprintf(stderr,"Succeeded pinning to cpu %d\n",w);
finished=1;
}
}
return Val_unit;
}
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