Linux下进程绑定多CPU运行

在服务器上，我们经常会有多个CPU的情况，而此时如果把进程都绑定在一个CPU上，那么对资源太多浪费了，下面的代码就实现了如何将程序绑定在不同的cpu上。传入参数代表绑定第几个cpu（从0开始计算）

//cpu_test.cpp
#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”);
                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)
        {
                printf(“warning: could not set CPU affinity, continuing…\n”);
        }
        while (1)
        {
    usleep(10000);
                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;
}
//g++ cpu_test.cpp -o cpu_test

下载源代码

下面解释一下，里面用到的函数：
首先解释一下一个叫CPU亲和力