CudaMallocPitch and CudaMemcpy

Accelerated Computing CUDA CUDA Programming and Performance
1

Hi,
I am allocating memory for image size 620*480 using CudaMallocPitch with Pitch 640.
Is this means it is allocating (640 * 480) size of memory in GPU ??

Thanks,
TUshar

2

When you use cudaMallocPitch, you don’t get to specify the pitch. The routine itself decides what the pitch will be and returns that in the pitch variable.

If it returned a value of 640, that would mean that the width of the actual allocation is 640 bytes ( and the total allocation size would be that width multiplied by whatever height you requested.)

3

Hi txbob,

Thanks for reply.
I realize my mistake of giving wrong pitch value for source data.
In GPU memory allocation was 640x480 but CPU memory allocation is 620x480 and I m trying to copy 640x480 amount of info from CPU to GPU.

Thanks,
Tushar