float* src;
cudaError_t err = cudaMalloc((void**)&src, totalsize*sizeof(float));
// totalsize 是 512*512*354
// 这里总是分配不成功，err = cudaErrorMemoryAllocation，是太大了么
查了下API，确实是这个原因
cudaErrorMemoryAllocation = 2 The API call failed because it was
unable to allocate enough memory to perform the requested operation.Read more at:
http://docs.nvidia.com/cuda/cuda-runtime-api/index.html#ixzz3ullrrFke
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如果数据过大，是一个三维的数据，有什么办法可以解决么