检测指针是否指向CUDA中的设备或主机 [英] Detection if a pointer is pointing in the device or host in CUDA

问题描述

在CUDA中有任何方法可以知道指针是否指向设备或主机上的内存。

In CUDA are there any way of knowing if the pointer is pointing in memory on the device or the host.

这样做的操作示例可以是： / p>

A made op example of this could be:

int *dev_c, *host_c;
cudaMalloc( (void**)&dev_c, sizeof(int) );
host_c = (int*) malloc(sizeof(int));

我当然可以看看名称，但是有什么办法看广告的指针dev_c和

I can of course look at the name, but are there any way of looking ad the pointer dev_c and host_c and saying, host_c points ad the host and dev_c points ad the device.

推荐答案

开始（我认为）CUDA 4和Fermi GPU。 Nvidia支持 UVA（统一虚拟地址空间）。
功能 cudaPointerGetAttributes 似乎在做什么你要的。注意，我相信它只适用于分配了cudaHostAlloc（而不是c malloc）的主机指针。

Starting (I think) CUDA 4 and Fermi GPUs. Nvidia supports UVA (Unified Virtual Address Space). Function cudaPointerGetAttributes seems to do exactly what you're asking for. Note that I believe it only works for host pointers allocated with cudaHostAlloc (and not c malloc).

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