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Altera_Forum
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11 years ago

processing element and work items

Hi there, I have a general question here. If I compile a kernel with BLOCK_SIZE=32, SIMD_WORK_ITEM=2, 2-D work groups. The kernels has attributes as: __attribute((reqd_work_group_size(BLOC...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

Number of work-items that will launched will be 16*32.

That is because the compiler will vectorize the work-items on the local_id(0) dimension; each work-item will do the work of two work-items. Hence, half the number of work-items on this dimension will be launched.