CODEWITHSUNDEEP
openclgpu
Fresto
Fresto

Reputation: 465

How to maximize use the GPU on OpenCL?

I use OpenCL on AMD Radeon Vega 64. In the task manager i see that GPU using at 7% max. How to maximize use the GPU?

NDRange global(100000);
queue.enqueueNDRangeKernel(kernel, NULL, global));

Upvotes: 0

Views: 154

Answers (2)

Ruyk
Ruyk

Reputation: 795

You can try to manually set the work group size to a value that will increase performance. Typically the defaults are good enough, but sometimes you may want to use clGetKernelWorkGroupInfo to obtain kernel-specific values, such as CL_KERNEL_PREFERRED_WORK_GROUP_SIZE_MULTIPLE. The latter can be used as an indication of what a good custom work group size can be for a given OpenCL kernel.

Upvotes: 0

apetranzilla
apetranzilla

Reputation: 5939

Mostly through trial and error. Depending on your kernel, the easiest way is to simply increase the global work size. You can also attempt to use available info like CL_DEVICE_MAX_COMPUTE_UNITS or CL_DEVICE_MAX_WORK_ITEM_SIZES to programmatically determine the work size, but it's not totally reliable.

Upvotes: 1

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