Hi Souvik
Also worth checking:
1) If you can ssh passwordless from ict1 to ict2 *and* vice versa.
2) If your /etc/hosts file on *both* machines list ict1 and ict2
and their IP addresses.
3) In case you have a /home directory on each machine (i.e. /home is
not NFS mounted) if your .bashrc files on *both* machines set the PATH
and LD_LIBRARY_PATH to point to the OpenMPI directory.
Gus Correa
Gus Correa wrote:
Hi Souvik
I would guess you only installed OpenMPI only on ict1, not on ict2.
If that is the case you won't have the required OpenMPI libraries
on ict:/usr/local, and the job won't run on ict2.
I am guessing this, because you used a prefix under /usr/local,
which tends to be a "per machine" directory,
not a typical name of an NFS
mounted directory.
Using an NFS mounted directory is another way to make
OpenMPI visible to all nodes.
See this FAQ:
http://www.open-mpi.org/faq/?category=building#where-to-install
I hope this helps,
Gus Correa
---------------------------------------------------------------------
Gustavo Correa
Lamont-Doherty Earth Observatory - Columbia University
Palisades, NY, 10964-8000 - USA
---------------------------------------------------------------------
souvik bhattacherjee wrote:
Dear all,
Myself quite new to Open MPI. Recently, I had installed openmpi-1.3.3
separately on two of my machines ict1 and ict2. These machines are
dual-socket quad-core (Intel Xeon E5410) i.e. each having 8 processors
and are connected by Gigabit ethernet switch. As a prerequisite, I can
ssh between them without a password or passphrase ( I did not supply
the passphrase at all ). Thereafter,
$ cd openmpi-1.3.3
$ mkdir build
$ cd build
$ ../configure --prefix=/usr/local/openmpi-1.3.3/
Then as a root user,
# make all install
Also .bash_profile and .bashrc had the following lines written into them:
PATH=$PATH:/usr/local/openmpi-1.3.3/bin/
LD_LIBRARY_PATH=/usr/local/openmpi-1.3.3/lib/
----------------------------------------------------------------------------------------------------------------------------------------------------------------------
$ cd ../examples/
$ make
$ mpirun -np 2 --host ict1 hello_c
hello_c: error while loading shared libraries: libmpi.so.0: cannot
open shared object file: No suchfile or directory
hello_c: error while loading shared libraries: libmpi.so.0: cannot
open shared object file: No suchfile or directory
$ mpirun --prefix /usr/local/openmpi-1.3.3/ -np 2 --host ict1 hello_c
Hello, world, I am 1 of 2
Hello, world, I am 0 of 2
But the program hangs when ....
$ mpirun --prefix /usr/local/openmpi-1.3.3/ -np 2 --host ict1,ict2
hello_c
This statement does not produce any output. Doing top on either
machines does not show any hello_c running. However, when I press
Ctrl+C the following output appears
^Cmpirun: killing job...
--------------------------------------------------------------------------
mpirun noticed that the job aborted, but has no info as to the process
that caused that situation.
--------------------------------------------------------------------------
--------------------------------------------------------------------------
mpirun was unable to cleanly terminate the daemons on the nodes shown
below. Additional manual cleanup may be required - please refer to
the "orte-clean" tool for assistance.
--------------------------------------------------------------------------
ict2 - daemon did not report back when launched
$
The same thing repeats itself when hello_c is run from ict2. Since,
the program does not produce any error, it becomes difficult to locate
where I might have gone wrong.
Did anyone of you encounter this problem or anything similar ? Any
help would be much appreciated.
Thanks,
--
Souvik
------------------------------------------------------------------------
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