On Jun 16, 2007, at 3:22 AM, Francesco Pietra wrote:
The question is whether, in compiling openmpi,the flag
libnuma is needed or simply useful also in the special
arrangement of the Tyan S2895 Thunder K8WE with two
dual-core opterons and eighth memory modules, two GB
each.
At worst, it is not harmful. At best, it is helpful.
We're still playing / experimenting with the memory affinity controls
and don't have great support for it at the moment. It's ok, but it
will likely mainly end up smoothing your results over repeated runs
rather than result in dramatic performance improvements. Note that
you need to enable processor affinity for OMPI to use memory
affinity. See the FAQ for more information.
If so (being first time to compile a mpi, and being
nonexpert singleuser/administrator) I would be much
obliged for checking the series of commands below (as
superuser) for Linux Debian amd64 etch:
cd /usr/local
bunzip2 openmpi-1.2.2.tar.bz2
tar xvf openmpi-1.2.2.tar
cd /usr/local/openmpi-1.2.2
FC=/opt/intel/cce/9.1.036/bin/ifort; export FC
CC=/opt/intel/cce/9.1.042/bin/icc; export CC
CXX=/opt/intel/cce/9.1.042/bin/icpc; export CXX
./configure --with-libnuma=/full pat to libnuma-dev
0.9.11-4, 0.9.11-3 (not yet installed)
make
make install
This all looks fine. You might always want to set F77 to the same
value as FC. Alternatively, you can run:
./configure CC=/opt/intel/... CXX=/opt/intel/... (etc.)
and not set the variables in the environment. In terms of end
results, the effect is identical between the two techniques. The
only difference is that if you put the CC=... stuff on the configure
command line, which compilers you specifically chose will be recorded
in the config.log file, which can be handy for referring to later and/
or debugging problems.
followed by setting as user in my .bashrc
MPI_HOME=/usr/local; export MPI_HOME
Note that Open MPI does not use the MPI_HOME environment variable.
If you already have /usr/local/bin in your PATH and /usr/local/lib in
your LD_LIBRARY_PATH, you're set.
____
mpi for a computational application that is best
compiled with intel. On my system those intels already
furnish runtime
/opt/intel/fce/9.1.036/lib/libimf.so
/opt/intel/cce/9.1.042/lib/libimf.so
to a QM code (NWChem 5.0) that is built-in
parallelized with TCGMSG.
Thanks
francesco pietra
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