Linux 操作系统下CPU多核心的绑定

现在多CPU的趋势越来越大了. 有时候为了更好地操作机器, 需要将某个进程绑定到具体的CPU上去. 下面给出了一个进程绑定到具体的CPU上去的一个例子.

cpu.c

[CODE]
#include<stdlib.h>
#include<stdio.h>
#include<sys/types.h>
#include<sys/sysinfo.h>
#include<unistd.h>

#define __USE_GNU
#include<sched.h>
#include<ctype.h>
#include<string.h>

int main(int argc, char* argv[])
{
        int num = sysconf(_SC_NPROCESSORS_CONF);
        int created_thread = 0;
        int myid;
        int i;
        int j = 0;

        cpu_set_t mask;
        cpu_set_t get;

        if (argc != 2)
        {
                printf("usage : ./cpu num\n");　　//输入要绑定的CPU序号
                exit(1);
        }

        myid = atoi(argv[1]);

        printf("system has %i processor(s). \n", num);

        CPU_ZERO(&mask);
        CPU_SET(myid, &mask);

        if (sched_setaffinity(0, sizeof(mask), &mask) == -1)　　//绑定到CPU
        {
                printf("warning: could not set CPU affinity, continuing...\n");
        }
        while (1)
        {

                CPU_ZERO(&get);
                if (sched_getaffinity(0, sizeof(get), &get) == -1)
                {
                        printf("warning: cound not get cpu affinity, continuing...\n");
                }
                for (i = 0; i < num; i++)
                {
                        if (CPU_ISSET(i, &get))
                        {
                                printf("this process %d is running processor : %d\n",getpid(), i);
                        }
                }
        }
        return 0;
}