CODEWITHSUNDEEP
openclgpunvidiaamd-processor
JRPete
JRPete

Reputation: 3144

Memory allocation Nvidia vs AMD

I know there is a 128MB limit for a single block of GPU memory on AMD GPU's. Is there a similar limit on Nvidia GPU's?

Upvotes: 3

Views: 4073

Answers (2)

Alexander Kojevnikov
Alexander Kojevnikov

Reputation: 17742

On GTX 560 clGetDeviceInfo returns 256MiB for CL_DEVICE_MAX_MEM_ALLOC_SIZE, however I can allocate slightly less than 1GiB. See this thread discussing the issue.

On AMD however this limit is enforced. You can raise it by changing GPU_MAX_HEAP_SIZE and GPU_MAX_ALLOC_SIZE environment variables (see this thread).

Upvotes: 3

Dr. Snoopy
Dr. Snoopy

Reputation: 56397

You can query this information at runtime using clGetDeviceInfo and CL_DEVICE_MAX_MEM_ALLOC_SIZE.

See clGetDeviceInfo Man Page for more information.

Upvotes: 5

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