Hi Jody,
The node names are exactly the same. I wanted to avoid updating the
version because I'm not the system administrator, and it could take
some time before it gets done. If it's likely to fix the problem
though I'll try it. I'm assuming that I don't have to do something
analogous to the old "lamboot" command to initialise Open MPI on all
the nodes. I've seen no documentation anywhere that says I should.
Cheers,
Hugh
On 28 Apr 2009, at 15:28, jody wrote:
Hi Hugh
Again, just to make sure, are the hostnames in your host file well-
known?
I.e. when you say you can do
ssh nodename uptime
do you use exactly the same nodename in your host file?
(I'm trying to eliminate all non-Open-MPI error sources,
because with your setup it should basically work.)
One more point to consider is to update to Open-MPI 1.3.
I don't think your OPen-MPI version is the cause of your trouble,
but there have been quite some changes since v1.2.5
Jody
On Tue, Apr 28, 2009 at 3:22 PM, Hugh Dickinson
<h.j.dickin...@durham.ac.uk> wrote:
Hi Jody,
Indeed, all the nodes are running the same version of Open MPI.
Perhaps I
was incorrect to describe the cluster as heterogeneous. In fact,
all the
nodes run the same operating system (Scientific Linux 5.2), it's
only the
hardware that's different and even then they're all i386 or i686.
I'm also
attaching the output of ompi_info --all as I've seen it's
suggested in the
mailing list instructions.
Cheers,
Hugh
Hi Hugh
Just to make sure:
You have installed Open-MPI on all your nodes?
Same version everywhere?
Jody
On Tue, Apr 28, 2009 at 12:57 PM, Hugh Dickinson
<h.j.dickinson_at_[hidden]> wrote:
Hi all,
First of all let me make it perfectly clear that I'm a complete
beginner
as
far as MPI is concerned, so this may well be a trivial problem!
I've tried to set up Open MPI to use SSH to communicate between
nodes on a
heterogeneous cluster. I've set up passwordless SSH and it seems
to be
working fine. For example by hand I can do:
ssh nodename uptime
and it returns the appropriate information for each node.
I then tried running a non-MPI program on all the nodes at the
same time:
mpirun -np 10 --hostfile hostfile uptime
Where hostfile is a list of the 10 cluster node names with
slots=1 after
each one i.e
nodename1 slots=1
nodename2 slots=2
etc...
Nothing happens! The process just seems to hang. If I interrupt the
process
with Ctrl-C I get:
"
mpirun: killing job...
[gamma2.phyastcl.dur.ac.uk:18124] [0,0,0] ORTE_ERROR_LOG: Timeout
in file
base/pls_base_orted_cmds.c at line 275
[gamma2.phyastcl.dur.ac.uk:18124] [0,0,0] ORTE_ERROR_LOG: Timeout
in file
pls_rsh_module.c at line 1166
--------------------------------------------------------------------
------
WARNING: mpirun has exited before it received notification that all
started processes had terminated. You should double check and
ensure
that there are no runaway processes still executing.
--------------------------------------------------------------------
------
"
If, instead of using the hostfile, I specify on the command line
the host
from which I'm running mpirun, e.g.:
mpirun -np 1 --host nodename uptime
then it works (i.e. if it doesn't need to communicate with other
nodes).
Do
I need to tell Open MPI it should be using SSH to communicate? If
so, how
do
I do this? To be honest I think it's trying to do so, because
before I set
up passwordless SSH it challenged me for lots of passwords.
I'm running Open MPI 1.2.5 installed with Scientific Linux 5.2.
Let me
reiterate, it's very likely that I've done something stupid, so all
suggestions are welcome.
Cheers,
Hugh
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