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Altera_Forum
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8 years ago

More Work items - More Resource usage?

I have tried increasing work items per work group with number of CU = 1 using the following attribute __attribute__((reqd_work_group_size(BLOCKDIM,BLOCKDIM,1))) in the matrix multiplication ex...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

I have explained this multiple times in different threads, so I will just post some of the existing discussions:

https://www.alteraforum.com/forum/showthread.php?t=56121

https://www.alteraforum.com/forum/showthread.php?t=55522

https://www.alteraforum.com/forum/showthread.php?t=57567

tl;dr: There is no thread-level parallelism in NDRange kernels unless you use SIMD or compute unit replication. Threads are just pipelined and increasing work-group size will hardly affect performance or area usage.