opencl local memory and workgroup size

961 views Asked by eclipse0922 At 16 October 2024 at 02:06

i am trying to use local memory in my OpenCL kernel.

Following lists are related information.

Device info

GPU: Qualcomm Adreno 420
local memory size: 32768Bytes = 32KB
max work group size: 1024

kernel info A (without local memory usage)

CL_KERNEL_WORK_GROUP_SIZE=1024
CL_KERNEL_LOCAL_MEM_SIZE=0 Bytes

kernel info B (with local memory usage)

CL_KERNEL_WORK_GROUP_SIZE=224
CL_KERNEL_LOCAL_MEM_SIZE=2048 Bytes

Difference between kernel A and B is just usage of local memory. what makes this situation?

if this is register problem, then CL_KERNEL_WORK_GROUP_SIZEof kernel A should be lower than 1024.

I really want to check register usage, but i can't.

I believe that i have enough local memory, global memory.

Please help.

TechQA.