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memorycudatexture2d

cuda 2D layered tex size: too large?

Following if the code to initiate a 3D array in cuda with size being width = 809; hight = 127; and number of layers = 2160;

cudaArray *sinor;
    cudaExtent volumeSize = make_cudaExtent(809, 127, 2160);
const cudaChannelFormatDesc channelDesc = cudaCreateChannelDesc<float>();
gpuErrchk(cudaMalloc3DArray(&sinor, &channelDesc, volumeSize, cudaArrayLayered));

last line returns error "invalid argument" error. Is that because my number of layer is too large? I tried 1940, and it was fine. If I cannot do such a large number of layers, what is the work around here ? Thanks alot.

Solution

  • You can find the texture layer depth limit on the documentation here. As you inferred, the depth limit for layered textures and surfaces is 2048.

    As was suggested in comments, your only real workaround here is to split your data over multiple texture objects and select between the objects based on index within the virtual combined textures.