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Journeyman III

simple_matmult sample computes incorrect

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


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.

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