| 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; } 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. QUOTE: 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
| |