acc_set_device_num && acc_get_device_num例程

void acc_set_device_num( int, acc_device_t );

描述
在指定类型的所有设备中， acc_set_device_num 告诉运行时库环境用哪一个设备。如果 devicenum 的值为负，运行时环境将恢复到编译器自行定义的默认行为。如果第二个
参数是零，选定的设备编号将应用到所有的加速器类型。

int acc_get_device_num( acc_device_t );

描述
acc_get_device_num 例程返回一个与指定类型设备编号相对应的整数，该设备将执行下一个加速器 parallel 区域或 kernels 区域。

setgetdevicenum.c代码

 /* 文件名: setgetdevicenum.c
 * 功能 : 测试函数acc_get_device_num(.)和acc_get_num_devices(.).
 */
 #include<stdio.h>
 #include"openacc.h"
 int main()
 {
 int num = -, cdev;
 int i;
 num = acc_get_num_devices(acc_device_default);
 printf(" nothing set, #device_dafault = %d\n", num);
 num = acc_get_num_devices(acc_device_nvidia);
 printf(" nothing set, #device_nvidia = %d\n", num);
 num = acc_get_num_devices(acc_device_xeonphi);
 printf(" nothing set, #device_xeonphi = %d\n", num);
 cdev = acc_get_device_num(acc_device_xeonphi);
 printf(" nothing set, device_xeonphi = %d\n", cdev);
 acc_set_device_num(, acc_device_default);
 cdev = acc_get_device_num(acc_device_default);
 printf("default 1 set, device_dafault = %d\n", cdev);
 acc_set_device_num(, acc_device_default);
 cdev = acc_get_device_num(acc_device_nvidia);
 printf("default 1 set, device_nvidia = %d\n", cdev);
 acc_set_device_num(, acc_device_nvidia);
 cdev = acc_get_device_num(acc_device_default);
 printf(" nvidia 1 set, device_default = %d\n", cdev);
 acc_set_device_num(, acc_device_nvidia);
 cdev = acc_get_device_num(acc_device_nvidia);
 printf(" nvidia 1 set, device_nvidia = %d\n", cdev);
 num = acc_get_num_devices(acc_device_nvidia);
 for(i = -num; i< *num; i++)
 {
 acc_set_device_num(i, acc_device_nvidia);
 cdev = acc_get_device_num(acc_device_nvidia);
 printf("i =%2d, cdev = %d\n",i, cdev);
 }
 return ;
 }

编译信息