What is this warning and how can I fix it?
warning: ‘cudaError_t cudaMemcpyToArray(cudaArray_t, size_t, size_t, const void*, size_t, cudaMemcpyKind)’ is deprecated [-Wdeprecated-declarations]
Why am I getting a warning about cudaMemcpyToArray(...) being deprecated?
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1 Answers
Deprecated means it is not recommended for use, and the support for it may be dropped in the very next CUDA release.
A description of what to do about it is given here.
For a typical usage where you are copying an entire allocation from host to device, and the source (host) allocation is a flat (unpitched) allocation of width w elements by height h rows, perhaps something like this:
cudaMemcpyToArray(dst, 0, 0, src, h*w*sizeof(src[0]), cudaMemcpyHostToDevice)
You would replace it with:
cudaMemcpy2DToArray(dst, 0, 0, src, w*sizeof(src[0]) , w*sizeof(src[0]), h, cudaMemcpyHostToDevice);
The replacement API (cudaMemcpy2DToArray) is documented here.
Note that in the example that I have given, if you have no sense of a "2D" allocation consisting of rows and columns, but instead have a single flat allocation of (let's say) w elements, you can simply set h=1 in the formulation above.
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