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ZIH
hpcsupport
hpc-compendium
Commits
6b678a16
Commit
6b678a16
authored
2 years ago
by
Danny Marc Rotscher
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Mpi errors
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doc.zih.tu-dresden.de/docs/jobs_and_resources/mpi_issues.md
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@@ -34,8 +34,8 @@ UCX.
The function
`MPI_Win_allocate`
is a one-sided MPI call that allocates memory and returns a window
object for RDMA operations (ref.
[
man page
](
https://www.open-mpi.org/doc/v3.0/man3/MPI_Win_allocate.3.php
)
).
> Using MPI_Win_allocate rather than separate MPI_Alloc_mem + MPI_Win_create may allow the MPI
implementation to optimize the memory allocation.
> (Using advanced MPI)
> Using MPI_Win_allocate rather than separate MPI_Alloc_mem + MPI_Win_create may allow the MPI
>
implementation to optimize the memory allocation.
(Using advanced MPI)
It was observed for at least for the
`OpenMPI/4.0.5`
module that using
`MPI_Win_Allocate`
instead of
`MPI_Alloc_mem`
in conjunction with
`MPI_Win_create`
leads to segmentation faults in the calling
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