How to use sched_getaffinity and sched_setaffinity in Linux from C?
affinity, c, linux, process, schedule
Solution
To use sched_setaffinity to make the current process run on core 7 you do this:
cpu_set_t my_set; /* Define your cpu_set bit mask. */
CPU_ZERO(&my_set); /* Initialize it all to 0, i.e. no CPUs selected. */
CPU_SET(7, &my_set); /* set the bit that represents core 7. */
sched_setaffinity(0, sizeof(cpu_set_t), &my_set); /* Set affinity of tihs process to */
/* the defined mask, i.e. only 7. */
See http://linux.die.net/man/2/sched_setaffinity & http://www.gnu.org/software/libc/manual/html_node/CPU-Affinity.html for more info.
Problem
I am trying to: Run 16 copies concurrently with processor pinning (2 copies per core) Run 8 copies concurrently with processor pinning (2 copies per core) and flipping processor core to the furthest core after certain function say function 1 finishes. The problem I am facing is how to select the farthest processor. Some friends suggested to use sched_getaffinity and sched_setaffinity but I count not find any good examples.