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Number of work groups running simultaneously depends on the compiler? Is it not the number of compute units?
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There are two different levels of work-group concurrency:
- Work-groups are pipelined one after another in the same compute unit. Each region between two barriers can be occupied by a different work-group to maximize to maximize pipeline efficiency. The number of work-groups that can be in-flight in the same compute unit is decided by the compiler and is not controllable by the user. This is what I was referring to above.
- Work-groups can also run in parallel in different compute units. Altera recommends having at least three times more work-groups than compute units so that coupled with work-group pipelining, circuit occupancy is maximized.
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