On Jul 12, 2011, at 2:34 PM, Paul Kapinos wrote: > Hi OpenMPI folks, > > Using the version 1.4.3 of OpenMPI, I wanna to wrap the 'ssh' calls, which > are made from the OpenMPIs 'mpiexec'. For this purpose, at least two ways > seem to be possible for me: > > 1. let the wrapper have the name 'ssh' and paste the path where it is into > the PATH envvar *before* the path to real ssh > > Q1: Would this work?
Probably - but I wouldn't recommend it > > 2. use MCA parameters described in > http://www.open-mpi.org/faq/?category=rsh#rsh-not-ssh > to bend the call to my wrapper, e.g. > export OMPI_MCA_plm_rsh_agent=WrapPer > export OMPI_MCA_orte_rsh_agent=WrapPer > > the oddly thing is, that the OMPI_MCA_orte_rsh_agent envvar seem not to have > any effect, whereas OMPI_MCA_plm_rsh_agent works. > Why I believe so? orte_rsh_agent doesn't exist in the 1.4 series :-) Only plm_rsh_agent is available in 1.4. "ompi_info --param orte all" and "ompi_info --param plm rsh" will confirm that fact. > > Because "strace -f mpiexec ..." says still trying for opening 'ssh' if > OMPI_MCA_orte_rsh_agent is set, and correctly trying to open the 'WrapPer' > iff OMPI_MCA_plm_rsh_agent is set. > > Q2: Is the supposed non-functionality of OMPI_MCA_orte_rsh_agent a bug, or do > I have just misunderstood something? > > Best wishes, > Paul > > P.S. reproducing: just set the envvars and do 'strace -f mpiexec ...' > > example: > > export OMPI_MCA_plm_rsh_agent=WrapPer > ---> look'n for 'WrapPer'; > stat64("/opt/lsf/8.0/linux2.6-glibc2.3-x86_64/bin/WrapPer", 0xffff8324) = -1 > ENOENT (No such file or directory) > > export OMPI_MCA_orte_rsh_agent=WrapPer > (do not forget to unset OMPI_MCA_plm_rsh_agent :o) > ---> still looking for 'ssh' > stat64("/opt/lsf/8.0/linux2.6-glibc2.3-x86_64/bin/ssh", 0xffff8324) = -1 > ENOENT (No such file or directory) > > ===> OMPI_MCA_orte_rsh_agent does not work?! > > -- > Dipl.-Inform. Paul Kapinos - High Performance Computing, > RWTH Aachen University, Center for Computing and Communication > Seffenter Weg 23, D 52074 Aachen (Germany) > Tel: +49 241/80-24915 > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
