全局功能和设备功能之间的区别 [英] Difference between global and device functions

问题描述

谁能描述 __ global __ 和 __ device __ 之间的区别？

Can anyone describe the differences between __global__ and __device__ ?

何时应使用 __ device __ ，何时应使用 __ global __ ？。

When should I use __device__, and when to use __global__?.

推荐答案

全局函数也称为内核。是您可以使用CUDA内核调用语义（<<< ...>> ）从主机端调用的函数。

Global functions are also called "kernels". It's the functions that you may call from the host side using CUDA kernel call semantics (<<<...>>>).

只能从其他设备或全局功能调用设备功能。 __ device __ 函数不能从主机代码中调用。

Device functions can only be called from other device or global functions. __device__ functions cannot be called from host code.

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