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2.31. openmpi

Open MPI, MVAPICH, and MVAPICH2 are all competing implementations of the Message Passing Interface (MPI) standard. MVAPICH implements version 1 of the MPI standard, while Open MPI and MVAPICH2 both implement the later, version 2 of the MPI standard.

mvapich and mvapich2 in Red Hat Enterprise Linux 5 are compiled to support only InfiniBand/iWARP interconnects. Consequently, they will not run over ethernet or other network interconnects. (BZ#466390)
When upgrading openmpi using yum, the following warning may be returned:
```
cannot open `/tmp/openmpi-upgrade-version.*' for reading: No such file or directory
```
```
cannot open `/tmp/openmpi-upgrade-version.*' for reading: No such file or directory
```
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The message is harmless and can be safely ignored. (BZ#463919)
A bug in previous versions of openmpi and lam may prevent you from upgrading these packages. This bug manifests in the following error (when attempting to upgrade openmpi or lam:
```
error: %preun(openmpi-[version]) scriptlet failed, exit status 2
```
```
error: %preun(openmpi-[version]) scriptlet failed, exit status 2
```
Copy to Clipboard Toggle word wrap
As such, you need to manually remove older versions of openmpi and lam in order to install their latest versions. To do so, use the following rpm command:
```
rpm -qa | grep '^openmpi-\|^lam-' | xargs rpm -e --noscripts --allmatches
```
```
rpm -qa | grep '^openmpi-\|^lam-' | xargs rpm -e --noscripts --allmatches
```
Copy to Clipboard Toggle word wrap
(BZ#433841)

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2.31. openmpi

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