Mobile, Graphics, and Gaming forum CL_MEM_USE_HOST_PTR overhead

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CL_MEM_USE_HOST_PTR overhead

Jeff M over 7 years ago

Hi,

I would like to confirm whether CL_MEM_USE_HOST_PTR has extra overhead, such as memory copy, on Mali G72.

According to ARM OpenCL Optimization Guide, using CL_MEM_USE_HOST_PTR is discouraged.

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.100614_0300_00_en/index.html

"8.3.3 Do not create buffers with CL_MEM_USE_HOST_PTR if possible"

Thanks,

Jeff

Top replies

Kévin Petit over 7 years ago +1 verified

Hi Jeff, CL_MEM_USE_HOST_PTR will result in copies being performed during map/unmap operations (unless the host_ptr passed in has been obtained with clSVMAlloc). To create a buffer that wraps memory...