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Altera_Forum's avatar
Altera_Forum
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11 years ago

Elongate pipeline voluntarily

Hi peeps, Suppose I have a global memory access which, according to profiling, stalls the pipeline very often. Well, first of all, is there a way to know for how many cycles is the pipelin...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

The problem is even though the kernel will issue these accesses in rapidly they most likely will not be coalesced unless spot0-spot6 are packed together. As a result you will end up with a subpar memory access pattern and then read data will most likely return spuratically that causes the stalling to occur. If data doesn't flow into the kernel as large blocks then the pipeline will stall because it's dependent on that data.