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
- #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)
- {
- 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;
- }
复制代码
下面是在两个终端分别执行了./cpu 0 ./cpu 2 后得到的结果. 效果比较明显.
Cpu0 : 5.3%us, 5.3%sy, 0.0%ni, 87.4%id, 0.0%wa, 0.0%hi, 2.0%si, 0.0%st
Cpu1 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu2 : 5.0%us, 12.2%sy, 0.0%ni, 82.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu3 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu4 : 0.0%us, 0.0%sy, 0.0%ni, 99.7%id, 0.3%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu5 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu6 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu7 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st |