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Chapter 5. Known Issues
The following note applies to the ia64 Architectures:
• Running perftest will fail if different CPU speeds are detected. As such, you should disable CPU
speed scaling before running perftest.
5.25. 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.
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(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
The message is harmless and can be safely ignored.
• 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
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
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5.26. qspice
The Simple Protocol for Independent Computing Environments (SPICE) is a remote display system
built for virtual environments which allows users to view a computing 'desktop' environment not only on
the machine where it is running, but from anywhere on the Internet and from a wide variety of machine
architectures.
• Occasionally, the video compression algorithm used by SPICE starts when the guest is accessing
text instead of video or moving content. This causes the text to appear blurry or difficult to read.
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(BZ#493375)
5.27. systemtap
SystemTap provides an instrumentation infrastructure for systems running the Linux 2.6 kernel. It
allows users to write scripts that probe and trace system events for monitoring and profiling purposes.
SystemTap's framework allows users to investigate and monitor a wide variety of wide variety of kernel
functions, system calls, and other evens that occur in both kernel-space and user-space.
The following are the Known Issues that apply to the systemtap package in Red Hat Enterprise Linux
5.4
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(BZ#463919)
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