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debug multi-GPU SYCL nstream

Open jeffhammond opened this issue 5 years ago • 1 comments

There may be a bug in multi-GPU SYCL nstream as reported in https://github.com/illuhad/hipSYCL/pull/399

@illuhad

jeffhammond avatar Dec 04 '20 16:12 jeffhammond

Yes, details here:

the value of ls as defined here: https://github.com/ParRes/Kernels/blob/eff76d7a6bb216e93f5cdf837cedc490b73553e7/Cxx11/nstream-multigpu-dpcpp.cc#L162

is used as start offsets of the local buffers, e.g. https://github.com/ParRes/Kernels/blob/eff76d7a6bb216e93f5cdf837cedc490b73553e7/Cxx11/nstream-multigpu-dpcpp.cc#L184

this does not look correct to me as I believe you would need to sum all the local lengths of all preceding GPUs to get the correct start offset.

illuhad avatar Dec 04 '20 16:12 illuhad