tanq

Different methods to create a memory buffer

Discussion created by tanq on Nov 9, 2010
Latest reply on Nov 22, 2010 by iya
What is the most effective

OpenCL specification give choise of 3 methods of createing memory buffer. I wonder which of them will work faster.

Methods:

1. call clCreateBuffer(), then clEnqueueWriteBuffer(), then run kernel

2. call clCreateBuffer() with CL_MEM_USE_HOST_PTR flag

3.  call clCreateBuffer(), then Map buffer, then manually write data to it, then unmap and run kernel

 

What alignment required from host memory pointer in methods 1 and 2? I suppose it will significantly influence data transfer speed

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