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Altera_Forum's avatar
Altera_Forum
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8 years ago

Kernel Report Occupancy

Hi mates!

Im struggling to understand what the occupancy means.. for my understanding its the amount of time spent by the kernel doing a memory access. Is it right?

So if my occupancy its 100% it says that im doing to much accesses?

Cumps

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    8 years ago

    Occupancy refers to what percentage of the profiled time the kernel pipeline is full with no "bubbles". 100% occupancy is good because it means that every stage of the pipeline is always active during the profiled time period. See the best practices guide for details on this.

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    8 years ago

    --- Quote Start ---

    Occupancy refers to what percentage of the profiled time the kernel pipeline is full with no "bubbles". 100% occupancy is good because it means that every stage of the pipeline is always active during the profiled time period. See the best practices guide for details on this.

    --- Quote End ---

    I saw the definition on the Best Practices Guide, but if i have a low percentage occupancy on a load operation is because of the memory latency / contention?

    for example

    # pragma unroll N

    for ...

    aux ^= a[z*16 +j]; //occupancy 25%