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Type: Posts; User: naroqueen

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    Re: creating objects in shared memory

    Thanks a lot david.garcia and wonwoolee :)
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    Re: OpenCL semaphores again and again...

    Thanks daa but unfortunately this code is not working as discussed in this thread: http://www.khronos.org/message_boards/viewtopic.php?f=28&t=3378 and many similar threads :(
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    OpenCL semaphores again and again...

    Hello,
    I couldn't find any way to implement something like semaphores with OpenCL due to the problem of limited GPU resources and lack of anything like OS threads scheduling on the GPU.
    Then what...
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    Re: Invalid command queue / access violation

    I could find a small tip, I tried putting conditions on all the indexes that might cause out of bounds error or cause an infinite loop, the error disappeared so far :)
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    Re: Invalid command queue / access violation

    I have a very similar problem, I get an Invalid command queue error when I try to put a value in an array in the global memory. If I comment this line, the kernel works very well! I checked that the...
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    atomics for shared memory variables?

    Hi all,

    I haven't posted in the Message Boards for a while! However I'd like to thank you for all the help you did to me in all my previous questions!

    My question is about atomics, could I...
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    Re: maximum pinned memory

    sorry for bothering you again birmat but I'll need also to know what Nvidia card you are using please...
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    Re: maximum pinned memory

    Thanks a lot birmat for your reply! that's really useful information that sounds like very reasonable... but still using pinned memory in my application doesn't improve the performance, on the...
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    Re: Mapped and Direct modes

    Thanks David but unfortunately they are not replying too :(
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    Re: Mapped and Direct modes

    any help? I'm sorry if my question is not clear as I am really confused and some how a OpenCL beginner...
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    Mapped and Direct modes

    Hi all,
    I need to asked about the oclBandwidthtest example, please, I have some parts that I don't understand in it... First, what is the difference between Direct and Mapped modes? and where can I...
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    Re: maximum pinned memory

    Thanks a lot David for your help always! I could overcome the problem of crashing by increasing the GPU timeout value...
    But I'm really astonished about the pinned memory behavior because I measure...
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    calling kernel from another kernel

    Hi,
    could I call & execute a kernel function from another kernel function?
    my GPU code does some computation on some input data and in the middle of the computations, it needs to compare the input...
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    creating objects in shared memory

    Hi all,
    I need to create an array in shared memory so that it could be accessed by all my program threads and they could perform computations on it or search for some value in it...
    how can I do...
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    Re: Reading file in OpenCL program

    Thanks for the reply :)
    of course this was a mistake BUT still it behaves the same... but I tried working with ifstream instead of wifstream so it worked correctly and the reading time became almost...
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    maximum pinned memory

    Hi,
    I have a small question about allocating and mapping buffers in pinned memory; is there maximum pinned memory size? how to know it? sometimes I keep increasing the size of my pinned memory...
  17. Re: passing an array of char* to kernel function

    Thanks very much for the reply but if it is not supported, how can I debug my opencl code on cpu? is there any way to do this with my Nvidia drive or the only way is to install ATI drive which...
  18. Thread: speed factor

    by naroqueen
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    speed factor

    Hi,
    I'd like to ask a small question, is the speed up factor bounded above by the number of cores in a GPU?
    I mean if I implemented an algorithm sequentially and run it on CPU then implemented it...
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    Re: Reading file in OpenCL program

    sorry, forgot to mention that the file I'm testing upon is written in Arabic..
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    Re: Reading file in OpenCL program

    Can't anybody help me check why this strange behavior happens?!!
    I made a small test to check if the problem is in my code: I copied one of the NVIDIA opencl samples and emptied the code written in...
  21. Re: passing an array of char* to kernel function

    Hi Andrew I know it has been a long time since I sent my last message in this thread but I have a small question related to your last message that I'd be grateful if you could answer...

    I need to...
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    Reading file in OpenCL program

    Hi,
    I have a very weird problem in an OpenCL project, in my program I read a text file at the host and load its contents to memory in order to start processing on it further, (this happens at the...
  23. Re: passing an array of char* to kernel function

    Thanks very much for the valuable advice :)
  24. Re: passing an array of char* to kernel function

    I don't know how to thank you Andrew for the detailed explanation... this made things much more clear.... by the way I tried implementing your idea of the character buffer and working on indices...
  25. Re: passing an array of char* to kernel function

    Thanks a lot Mr. David & Mr. Andrew for your help! I got your idea and I'll try implementing it but I tried another idea too (it might be less practical than yours, most probably I'll go for yours,...
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