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Ifpack2: Fix #12871 #12882
Ifpack2: Fix #12871 #12882
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Cannot Merge Pull Request# 12882: Github Mergeability = unstable; Git Mergeable = True |
This PR fixes #12871 and #12132 using a different approach than the merged PR #12864 that introduces the issue #12871.
In #12864 if a GPU aware MPI is not used, every nonblocking sends and receives use a mirror view on host to do the message passing.
However, this requires new blocking points after a nonblocking receive and before copying the data back to the device view and those points were not included in #12132.
Instead, this PR uses an approach that does not introduce extra blocking points and uses the existing ones encountered before
copy<ToMultiVector>
to copy the data from the host to the device.Similarly, the copy from device to host is done just after
copy<ToBuffer>
.This branch has been tried on Caraway MI210 and the issue of #12871 is gone with this branch.
@trilinos/ifpack2
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