I got it. The answer I was looking for was: lam deamons are
not in use anymore. mpirun does everything byitself as soon
as all the path variables are set up correctly. However, what
are the openIB and uDAPL warnings good for? E.g:
"
libibverbs: Fatal: couldn't read uverbs ABI version.
--
[0,1,1]: OpenIB on host neutrino was unable to find any HCAs.
Another transport will be used instead, although this may result in
lower performance.
--
--
[0,1,1]: uDAPL on host neutrino was unable to find any NICs.
Another transport will be used instead, although this may result in
lower performance.
--
"
Yours, Justus
On Mar 8, 2008, at 4:40 PM, Reuti wrote:
Am 08.03.2008 um 12:26 schrieb Justus Schwabedal:
I thought LAM/MPI is being merged into openmpi. I think, Im not
sure how the implementations are related. I think lam is just a
runtime for which now openmpi delivers some support. If not so, I
dont understand. However orte is another runtime right? I thought I
can switch between those using something like mpi-selector-menu. I
think Im lost. How can I use openmpi to run a distributed system
efficiently? I dont want to fall back on old LAM/MPI since I want
to be modern :o)
Yours, J
You can't mix different MPI implementations. If you compiled your
program with LAM/MPI, you must use their mpirun. There is no binary
interface defined for MPI, so that you could change the to be used
MPI implementation just on the fly from one run to the next. If you
want to change to Open MPI, you have to recompile your program and
use Open MPI's mpirun.
To your test-run: you specified to use two processes, but not where
to start them. Hence you must provide something like a machine file.
In LAM/MPI you could try:
mpirun C hello.x
(again: this only works in LAM/MPI).
In a distributed environment it's must common to use a queuing sytem
to select free nodes most efficiently for you. E.g. SGE ( http://
gridengine.sunsource.net/ ) or Torque ( http://
www.clusterresources.com/pages/products/torque-resource-manager.php )
and to start the jobs under their supervision.
-- Reuti
Original-Nachricht
Datum: Fri, 7 Mar 2008 13:19:16 -0500
Von: Jeff Squyres
An: Open MPI Users
Betreff: Re: [OMPI users] Problem: openmpi using lam
On Mar 7, 2008, at 11:31 AM, Justus Schwabedal wrote:
I need advise to get openmpi to work using lam.
I think you're slightly confused -- LAM/MPI and Open MPI are two
different software projects that implement the same standard (MPI).
This list is for supporting Open MPI. Another list
(http://www.lam-mpi.org/mailman/listinfo.cgi/lam
) is available for supporting LAM/MPI. You might want to refer to
the
"Getting Help" page on the LAM/MPI site
(http://www.lam-mpi.org/using/support/
). I suspect that your problem has to do with your hostfile, and
you
should check the LAM/MPI user's guide for the answer.
But be aware that LAM/MPI is in maintenance mode -- it is being
deprecated in favor of Open MPI. See the announcement at the top of
LAM/MPI's home page.
Good luck.
For testing I installed it on two machines running opensuse10.3
(both atholon 64) connected via ethernet. I then try to run a test
script "hello.x" with the following commands:
jus@cusp:~/Code/Spielwiese/Mpi> make hello
mpicc hello.c -o hello.x
jus@cusp:~/Code/Spielwiese/Mpi> lamboot mfile
LAM 7.1.4/MPI 2 C++/ROMIO - Indiana University
Enter passphrase for key '/cusp/jus/.ssh/id_rsa':
Enter passphrase for key '/cusp/jus/.ssh/id_rsa':
jus@cusp:~/Code/Spielwiese/Mpi> lamnodes
n0 cusp:1:origin,this_node
n1 neutrino.stat.physik.uni-potsdam.de:1:
jus@cusp:~/Code/Spielwiese/Mpi> mpirun -np 2 hello.x
Process 0 on cusp out of 2
Process 1 on cusp out of 2
The jobs are thus wrapped only on the node "cusp", not on both. I
have no clue why this is.
Thanks, Justus
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