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How to force placement of memory buffer in Windows?

Question asked by lolliedieb on Oct 4, 2020
Latest reply on Oct 9, 2020 by dipak

Hello,

 

2nd question today, but more or less unrelated to the first one.
I have an application, that needs to use almost the complete memory that the GPU offers (up to 5 MByte). The driver reports (via CL_DEVICE_GLOBAL_MEM_SIZE and CL_DEVICE_GLOBAL_FREE_MEMORY_AMD ) that enough memory is available and also the application obeys the wish not to exceed CL_DEVICE_MAX_MEM_ALLOC_SIZE. The total memory is split into two or three buffers, not necessarily the same size.

 

Still running the card in Linux it works fine, while in Windows 10 I see the driver starts to swap out memory to the host system once I try to touch the last ~256 MByte - and this slows down the execution extremely.

 

In both cases the GPU does no graphics out - this is done via an other device.

 

Question: is there any undocumented environment variable or other trigger to turn of GPU memory virtualization completely so it forces the buffer to be placed on device?

 

Thanks very much

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