I'm no expert on the preload-binary option - but I would suspect that
is the case given your observations.
That option was created to support checkpoint/restart, not for what
you are attempting to do. Like I said, you -should- be able to use it
for that purpose, but I expect you may hit a few quirks like this
along the way.
On Nov 11, 2009, at 9:16 AM, Qing Pang wrote:
Thank you very much for your help! I believe I do have password-less
ssh set up, at least from master node to client node (desktop ->
laptop in my case). If I type >ssh node1 on my desktop terminal, I
am able to get to the laptop node without being asked for password.
And as I mentioned, if I copy the example executable from desktop to
the laptop node using scp, then I am able to run it from desktop
using both nodes.
Back to the preload-binary problem - I am asked for the password of
my master node - the node I am working on - not the remote client
node. Do you mean that I should set up password-less ssh in both
direction? Does the client node need to access master node through
password-less ssh to make the preload-binary option work?
Ralph Castain Wrote:
It -should- work, but you need password-less ssh setup. See our FAQ
for how to do that, if you are unfamiliar with it.
On Nov 10, 2009, at 2:02 PM, Qing Pang wrote:
I'm having problem getting the mpirun "preload-binary" option to work.
I'm using ubutu8.10 with openmpi 1.3.3, nodes connected with
Ethernet cable.
If I copy the executable to client nodes using scp, then do mpirun,
everything works.
But I really want to avoid the copying, so I tried the -preload-
binary option.
When I typed the command on my master node as below (gordon-desktop
is my master node, and gordon-laptop is the client node):
--------------------------------------------------------------------------
gordon_at_gordon-desktop:~/Desktop/openmpi-1.3.3/examples$ mpirun
-machinefile machine.linux -np 2 --preload-binary $(pwd)/hello_c.out
--------------------------------------------------------------------------
I got the following:
gordon_at_gordon-desktop's password: (I entered my password here,
why am I asked for the password? I am working under this account
anyway)
WARNING: Remote peer ([[18118,0],1]) failed to preload a file.
Exit Status: 256
Local File: /tmp/openmpi-sessions-gordon_at_gordon-
laptop_0/18118/0/hello_c.out
Remote File: /home/gordon/Desktop/openmpi-1.3.3/examples/hello_c.out
Command:
scp gordon-desktop:/home/gordon/Desktop/openmpi-1.3.3/examples/
hello_c.out
/tmp/openmpi-sessions-gordon_at_gordon-laptop_0/18118/0/hello_c.out
Will continue attempting to launch the process(es).
--------------------------------------------------------------------------
--------------------------------------------------------------------------
mpirun was unable to launch the specified application as it could
not access
or execute an executable:
Executable: /home/gordon/Desktop/openmpi-1.3.3/examples/hello_c.out
Node: node1
while attempting to start process rank 1.
--------------------------------------------------------------------------
Had anyone succeeded with the 'preload-binary' option with the
similar settings? I assume this mpirun option should work when
compiling openmpi with default options? Anything I need to set?
--qing
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