linux 获取CPU个数详解程序员

    #include<stdio.h> 
    #include<unistd.h> 
 
    int main() 
    { 
    int cpu_num; 
    cpu_num = sysconf(_SC_NPROCESSORS_CONF); 
    printf("_SC_NPROCESSORS_CONF=%d/n",cpu_num); 
 
    cpu_num = sysconf(_SC_NPROCESSORS_ONLN); 
    printf("_SC_NPROCESSORS_ONLN=%d/n",cpu_num); 
 
    return 0; 
    } 
    /* 
    * - _SC_NPROCESSORS_CONF 
    * The number of processors configured. 
    * 
    * - _SC_NPROCESSORS_ONLN 
    * The number of processors currently online (available). 
    */