是否将cudaGetSymbolAddress和cudaMemcpyToSymbol与全局内存一起使用? [英] Appropriate usage of cudaGetSymbolAddress and cudaMemcpyToSymbol with global memory?

问题描述

我对 CUDA 相当陌生，并且熟悉 cudaMalloc 和 cudaMemcpy 的常规用法以及 cudaMemcpyToSymbol 复制到常量存储器.

I am fairly new to CUDA and am familiar with the normal usage of cudaMalloc and cudaMemcpy and also with cudaMemcpyToSymbol for copying to constant memory.

但是，我刚刚得到了一些代码，这些代码经常使用 cudaGetSymbolAddress 和 cudaMemcpyToSymbol 复制到全局内存中，我不确定为什么他们选择了代替 cudaMalloc / cudaMemcpy 来执行此操作.

However, I have just been given some code which makes frequent use of cudaGetSymbolAddress and cudaMemcpyToSymbol to copy to global memory and I'm not sure why they have chosen to do this instead of cudaMalloc/cudaMemcpy.

有人能够解释使用 cudaGetSymbolAddress 和 cudaMemcpyToSymbol 何时合适吗?

Would somebody be able to explain when it is advantageous and appropriate to use cudaGetSymbolAddress and cudaMemcpyToSymbol?

谢谢！

推荐答案

使用 cudaMalloc 动态分配全局内存时，要使用的正确复制API是 cudaMemcpy .

When global memory is allocated dynamically using cudaMalloc, then the correct copying API to use is cudaMemcpy.

分配了全局内存后，静态地:

__device__  int my_data[DSIZE];

然后正确使用的API是 cudaMemcpyToSymbol 或 cudaMemcpyFromSymbol

then the correct API to use is cudaMemcpyToSymbol or cudaMemcpyFromSymbol

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