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    SubjectRe: Interacting with coherent memory on external devices
    On Wed, 22 Apr 2015, Paul E. McKenney wrote:

    > Agreed, the use case that Jerome is thinking of differs from yours.
    > You would not (and should not) tolerate things like page faults because
    > it would destroy your worst-case response times. I believe that Jerome
    > is more interested in throughput with minimal change to existing code.

    As far as I know Jerome is talkeing about HPC loads and high performance
    GPU processing. This is the same use case.

    > Let's suppose that you and Jerome were using GPGPU hardware that had
    > 32,768 hardware threads. You would want very close to 100% of the full
    > throughput out of the hardware with pretty much zero unnecessary latency.
    > In contrast, Jerome might be OK with (say) 20,000 threads worth of
    > throughput with the occasional latency hiccup.
    >
    > And yes, support for both use cases is needed.

    What you are proposing for High Performacne Computing is reducing the
    performance these guys trying to get. You cannot sell someone a Volkswagen
    if he needs the Ferrari.



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