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;
}