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Subject: Re: [OMPI users] Can't start program across network
From: Raymond Wan (rwan_at_[hidden])
Date: 2009-03-13 21:12:20

Hi Jeff,

Jeff Squyres wrote:
> On Mar 13, 2009, at 6:17 AM, Raymond Wan wrote:
>> What doesn't work is:
>> [On Y] mpirun --host Y,Z --np 2 uname -a
>> [On Y] mpirun --host X,Y,Z --np 3 uname -a
>> ...and similarly for machine Z. I can confirm that from any of the 3
> Do you see "rsh" or "ssh" in the output of "ps -eadf" when mpirun is
> hanging, perchance? If you, what happens if you copy-n-paste those
> command lines and run them manually?

No, I don't see either rsh or ssh when mpirun is hanging. Is that odd? Something I'm doing wrong?

I only see an mpirun command and an orted command.

rwan 22800 22761 0 09:52 pts/2 00:00:00 mpirun --host X,Y,Z --np 3 sleep 1000
rwan 22804 1 0 09:52 ? 00:00:00 orted --bootproxy 1 --name 0.0.2 --num_procs 4 --vpid_start 0 --nodename Y --universe rwan_at_Y:default-universe-22800 --nsreplica "0.0.0;tcp://Y:36889" --gprreplica "0.0.0;tcp://Y:36889" --set-sid

Actually, when I run the above mpirun command, I don't see "sleep" running locally on machine Y, either. However, if I did this:

mpirun --host Y --np 3 sleep 1000

I see 3 instances of "sleep" when I do ps -aedf. Does mpirun try to "ssh" all networked machines first before it starts the program (even if one of those instances will run locally?). Perhaps unrelated...but when I am on Y and I do an rsh to Z, I get a "No route to host". I asked the sysadmin about it (I'm not the sysadmin of Y or Z) and he doesn't know why but as we should be using ssh anyway, he isn't going to address the problem (unless it is a side-effect of my mpirun problem). I only presume rsh hasn't been set up properly; ssh works fine, though.

Thank you!