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GPU result has number of walkers dependency and doesn't match CPU result #1054
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This seems to be a Volta V100 specific issue. I don't have this problem compiling and running the same simulation on GTX1080. Need help from someone with experience of Volta V100. |
Something does seem to be up with Volta: Compare "Volta-GCC-CUDA-Release" with "GCC-CUDA-Release". |
GCC-CUDA-Release runs on a Kepler. This is printed on one on the ~third line of output. Updated: Something happened between 7-8 August |
To keep this updated: the current belief is that this has hit some kind of edge case (bug) or is a newly surfaced problem on Volta or with recent CUDAs (bug). For whatever reason, our current tests don't show the same problem. @PDoakORNL will try to chase down. |
Some recent fixes in legacy CUDA probably addressed this issue. Open a new issue if needed. |
Details in the post here.
https://groups.google.com/forum/#!topic/qmcpack/eOE1eIXAgaE
Not 100% sure whether it is a problem for my build. ctest results here in the post
https://groups.google.com/forum/#!topic/qmcpack/1QzNQoceNHs
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