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Thread: Maximum private memory?

  1. #1
    Junior Member
    Join Date
    Oct 2009

    Maximum private memory?

    I'm wondering how I can find out the size limits of __private memory.
    I can already query the device for maximum __local and __global memory,
    but I cannot seem to find what parts are split into private memory.

    I need to know because I want to load some sets of data from global
    memory (each thread loads a different data set), and then each of my
    threads will search it's own data set. Because each thread is independent
    from each other, I cannot use a common __local memory to store it in.
    (I already filled this space actually )

    So I need to know how big *chunks* I can load from __global to
    __private memory without causing problems. I understand this is
    probably specific to what hardware I am using, so I am looking
    for some way of calculating this amount.

  2. #2
    Senior Member
    Join Date
    Jul 2009
    Northern Europe

    Re: Maximum private memory?

    Unfortunately this is very architecture-dependent as you guessed. In the case of Nvidia architectures I believe the more private memory you use, the less register file you have available, which means a smaller maximum workgroup size, and, hence, less parallelism. This implies a tradeoff between private memory usage and number of work-items running in parallel.

  3. #3
    Junior Member
    Join Date
    Oct 2009

    Re: Maximum private memory?

    Well Ok I guess I will have to simply test this then .

    Copying some data from global to private and searching it
    Searching it directly in global.

    Will report what I find

    (Btw I use Tesla 1060 on linux 64 if it is of any help to you)

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