10 Replies Latest reply on Jun 5, 2014 8:49 PM by mrrvlad

    Why does increasing the number of kernel arguments impacts performance ?

    sayantandatta

      GPU: 7970

      OS: Kubuntu 12.04 x64

      Driver: Catlyst 13.4

       

      Hi,

       

      I know this sounds crazy but it is actually true. Increasing the number of kernel arguments beyond a certain number causes the performance to drop. In one of my kernels if I move from 6 to 7 kernel arguments performance drops by 30% even though I don't do any computation with the the new kernel argument. I can't reduce the number of arguments by assembling them into a struct because all of them are dynamic arrays of variable length. Is there a way to avoid this problem ?

       

      Regards,

      Sayantan