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Thread: subbuffes + 1.0

  1. #1
    Junior Member
    Join Date
    Feb 2010
    Posts
    5

    subbuffes + 1.0

    Can someone explain to me why the subbuffers routine SUCCEEDS on a 1.0 system for me?

    I have mac osx lion 10.7 and the host system supports 1.1 (so it compiles using the gl subbuffers call) - but it also WORKS on the 1.0 device?

    CL_DEVICE_NAME: GeForce 9400M
    CL_DEVICE_VENDOR: NVIDIA
    CL_DRIVER_VERSION: CLH 1.0
    CL_DEVICE_VERSION: OpenCL 1.0

  2. #2

    Re: subbuffes + 1.0

    That sounds like a bug in the OpenCL implementation. Perhaps filing a bug report on the Khronos bug tracker will help, but since it is Nvidia, there is little hope for that.

  3. #3
    Junior Member
    Join Date
    Feb 2010
    Posts
    5

    Re: subbuffes + 1.0

    Big surprise there.

    however, the book I'm reading says sub-buffers are a software-only facility. So maybe having a 1.1 host is enough to have it suceed on a 1.0 device. Either way I NEED this functionality so I can't complain.

    Though I've found the following list of disastrous bugs in the CL implementation on apple if anyone wants to compare notes

    Old macbook + osx 10.7
    • *GL sharing + PBO writes = nvidia channel exception (kernel fault) = doesn't work.


    retina macbook + 10.8
    • *After awhile, creation of command queue fails for GPU with invalid_value. Have to reboot to fix.
      *Passing arguments to clBuildProgram and THEN using it again for a separate program with a NULL options parameter returns a random error and fails to build the program, usually with out of host memory (I have 16 gb of ram). I must then use empty string for build options instead.
      */Sometimes/ using non-normalized image reads on a CPU context results in invalid instruction. I haven't been able to reproduce this lately.
      *If you get a linker error that you're calling a function that doesn't exist (such as atan2f), you'll need to reboot to build the program even after fixing the error.

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