On a cluster I am using I am having a problem with ssh connections as part of impi/mpirun about 0.1-0.2% of the time; what happens is that they fail to launch and become zombie's (ps shows "[ssh] <defunct>"). Since fiddling through all the options within mpirun can be hard (particularly for impi which is rather fast), I found (after a comment from someone on the openssh list) a useful hack. I am providing it here as it is a nice way around things, and might be useful to others in the future.
The "trick" is to add --bootstrap-exec ~/bin/hssh or similar to the mpirun line in $WIENROOT/parallel_options, then create the executable ~/bin/hssh with something similar to: #!/bin/bash a=`echo $@ | sed -e 's/-q/-v/'` ssh $a The above allows me to turn verbose output on in the ssh command since impi insists on setting -q (quiet). For other cases something similar can be done. -- Professor Laurence Marks Department of Materials Science and Engineering Northwestern University www.numis.northwestern.edu 1-847-491-3996 "Research is to see what everybody else has seen, and to think what nobody else has thought" Albert Szent-Gyorgi _______________________________________________ Wien mailing list [email protected] http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien SEARCH the MAILING-LIST at: http://www.mail-archive.com/[email protected]/index.html
