让机器所有的cpu核打满

让机器所有的cpu核打满

       下面的程序可以将一个机器所有的cpu核打满：

       

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#define __USE_GNU
#include <sched.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <pthread.h>

void thread_func(int n)
{
    cpu_set_t mask;
    CPU_ZERO(&mask);
    CPU_SET(n,&mask);
    if (sched_setaffinity(0, sizeof(mask), &mask) == -1)
    {
       printf("warning: could not set CPU affinity, continuing...\n");
    }
    nice(-1);
    int pid[1];
    struct sched_param p[1];
    struct sched_param para;
    para.sched_priority = 23;
    sched_setscheduler(0, SCHED_FIFO, ¶);
    printf("Parent pid is %d policy is %d, prio:%d\n", getpid(), sched_getscheduler(0), para.sched_priority);
    while(1)
    {
    }
}

int main(int argc, char *argv[])
{
    int i = 0;
    pthread_t id[24];
    for (i = 0; i <=23 ; i++)
    {
        int ret;
        ret = pthread_create(&id[i], NULL, (void*)thread_func, i);
        if (ret != 0)
        {
            printf("Create pthread error!\n");
            return -1;
        }
    }
    // pthread_join
    for (i = 0; i <=23 ; i++)
    {
        pthread_join(id[i], NULL);
    }
    return 0;
}