Mpiexec release 0.75, InfiniBand support, restart PBS mom, more

[Pete Wyckoff]

Changes from the previous version are quite extensive, as it has been
seven months since the last release.  If any of the following topics
interest you, please give the new version a try.


New communication library:  MPICH on InfiniBand

    InfiniBand is a high-speed interconnect that is becoming popular in
    the message passing world.  The most popular implementation of MPI
    is the one from OSU/CIS based on MPICH and supported in this release
    of mpiexec.

PBS Mom restart

    Add support to reconnect to PBS moms which are restarted during the
    run of a parallel application.  This requires changes to PBS to work
    properly which are included in a new patch to OpenPBS found in this
    mpiexec distribution.
    
    It is a somewhat complex patch which fixes numerous crashes in the
    PBS code itself.  This support is still marked experimental, but
    give it a shot if you are interested in the ability to restart moms
    under running parallel processes.

MPIEXEC_RANK environment variable

    Many users take advantage of the "none" communication library to
    automate system tasks in the context of a PBS job.  There is now an
    environment variable which gives a different number to each task
    similar to the rank in an MPI implementation.  Thanks to Jose Luis
    Gordillo Ruiz and Eduardo Murrieta Leon for the idea and patch.

MPICH/P4 debugging fix

    Process arguments were moved around to allow debugging inside an
    xterm.  This always had worked for the other communication
    libraries.  Try "mpiexec xterm -e gdb --args mycode" to see it in
    action.

MPICH/P4 shmem command-line flag

    In the ongoing saga of the "--with-comm=shared" compile-time flag
    for the MPICH/P4 libmpich.a library itself, this adds a bit more
    flexibility.  Now mpiexec allows runtime specification of the
    shared-memory support of your mpich library.  You will be much
    happier if you compile mpiexec so that it knows if your mpich/p4
    library uses --comm=shmem or not, but this flag is handy in testing,
    or at sites which must support both types.

MPICH/GM GM2 bug fix

    Chris Maestas of Sandia found and fixed a problem when using mpiexec
    with MPICH/GM with the GM2 library.  This GM2 library is a major
    version change from the GM library most use now to drive their
    Myricom devices, and thus not yet widely adopted.


Full changelog and downloads at:  http://www.osc.edu/~pw/mpiexec/
Respond to the list with bug reports, comments, suggestions,
and complaints.

		-- Pete