13 Replies Latest reply on Dec 4, 2008 11:55 AM by jfkong

    simple_matmult sample computes incorrect

    stedon
      running simple_matmult with certain matrix sizes returns a "FAILED" at verify

      Hi,

      we have an issue with simple_matmult program from the samples package which we cannot explain up to now:

      Enabling verification, it turns out, that the results of the matrix-matrix-multiplication by CPU and GPU do not match for certain matrix sizes.

      For example, 64x64 and 128x128 always returns a PASSED, while a y-size of 65 or 129 returns a FAILED. This issue does not only depend on one of the sizes: While any x size with y size of 128 returns a PASSED, for y size of 1024 this is not true.

      Have you any clue, from what this could arise?

       

      Thanks for hints and answers,

      Stefan D.