Add CPU/GPU Memcpy in memory folder #2970
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| // For more details, please check https://stackoverflow.com/a/43870188/724872. | ||
| #define UNLIKELY(condition) __builtin_expect(static_cast<bool>(condition), 0) | ||
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| template <typename T> |
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Fix special case of PADDLE_ENFORCE
PADDLE_ENFORCE(condition, "hello world"); // OK, if using old implementation
PADDLE_ENFORCE(condition) // Failed, if using old implementation. But, it's addressed.
gangliao
changed the title
| const void* src, size_t num, | ||
| cudaStream_t stream) { | ||
| platform::GpuMemcpyAsync(dst, src, num, cudaMemcpyHostToDevice, stream); | ||
| } |
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Here, use cudaMemcpyDeviceToHost and cudaMemcpyHostToDevice, cudaMemcpyDeviceToDevice. But the cudaMemcpyKind of cudaMemcpyDefault:
cudaMemcpyDefault = 4
Direction of the transfer is inferred from the pointer values. Requires unified virtual addressing
Can we use cudaMemcpyDefault to simplify code？
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Sounds good. But, how to specialize one function to support both cases: (CPUPlace, GPUPlace),
(GPUPlace, CPUPlace).
One way may achieve that is std::enable_if, but it will dump too many annoying code.
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| //！Get the memory usage of current GPU device. | ||
| void GpuMemoryUsage(size_t& available, size_t& total); | ||
| void GpuMemoryUsage(size_t &available, size_t &total); |
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Here, we should unify the code style
size_t& available, size_t& total;
& and * should close to type.
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I didn't change this. Clang-format takes this job
| platform::CPUPlace src_place, | ||
| const void* src, size_t num, | ||
| cudaStream_t stream) { | ||
| platform::SetDeviceId(dst_place.device); |
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Maybe we should use platform::GPUPlaceGuard here
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I think it's unnecessary to use the guard to implicitly roll back the device id.
For GPU device, it's better to explicitly set device id.
| #ifndef PADDLE_ONLY_CPU | ||
| template <typename DstPlace, typename SrcPlace> | ||
| void Copy(DstPlace, void* dst, SrcPlace, const void* src, size_t num, | ||
| cudaStream_t stream); |
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It would be great to add a comment telling when would users call this second form of Copy.
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Sorry for replying too late due to we are on duty yesterday. Yeah, I will annotate this function. Thanks.
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| template <typename... Args> | ||
| inline void throw_on_error(cudaError_t e, const Args&... args) { | ||
| inline typename std::enable_if<sizeof...(Args) != 0, void>::type throw_on_error( |
| size_t GpuMaxChunkSize(); | ||
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| //! Copy memory from address src to dst asynchronously. | ||
| void GpuMemcpyAsync(void *dst, const void *src, size_t count, |
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Should we move these copying functions into a new source file, say, copy.{h,cc}? I am not sure. Just mention it.
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