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Thread: read_imagef : CL_RGBA vs CL_R

  1. #1

    read_imagef : CL_RGBA vs CL_R


    Is it normal that reading a RGBA+FLOAT image is much slower than reading a R+FLOAT?
    In my case, it's about 3 times slower. I understand that in the first case I read 4 floats while I read only 1 float for the second case.
    I expected to have a slight increase in reading time but not that much...



  2. #2
    Senior Member
    Join Date
    Oct 2012
    Did you had a look at the coalescing memory accesses? there will be 3 times less memory accesses when all acceces are coalesced, isn't it?

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