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Subject: Re: [OMPI users] Open MPI and env. variables (LD_LIBRARY_PATH and PATH) - complete and utter Open MPI / Linux noob
From: Tomislav Maric (tomislav.maric_at_[hidden])
Date: 2009-08-06 14:43:51

Hi Jeff,

thank you very much for your reply! :)

the problem wasn't only in the OMPI libs and bins, it was in other
binaries as well: OpenFOAM simulation suite is also installed locally so
  a short PATH could't be informative enough.

Actually, I know that the environment is exactly the same, because I'm
running liveDVDs with a sole purpose of setting up a NOW and running

Therefore, --prefix and /full/path/mpirun gave me the ability to find
orted and similar stuff needed for OMPI, but failed to give me the
linkage :) to OpenFOAM binaries and libs. That's why my solver
complained that it coulnd't link the .so libraries.

I'm not quite sure how secure is my solution, it seems a bit radical,
but I have tried everything, even sending vars with -x option but gave
up because there's like 50 of them. I would have to cat the -x arguments
from a file or smth. :)


Jeff Squyres wrote:
> Sorry for not replying earlier -- travel to the MPI Forum last week
> put me waaaay behind on my INBOX. :-(
> I don't think you want to "printenv > ~/.ssh/environment" -- you don't/
> can't know for sure that the remote environment should be exactly the
> same as your local environment.
> Instead, you might want to use OMPI's built-in "set the PATH /
> LD_LIBRARY_PATH remotely" functionality. Use the full path name to
> mpirun, like:
> /opt/openmpi/bin/mpirun ...
> And that should tell mpirun to set the PATH and LD_LIBRARY_PATH
> remotely. Note that this functionality assumes that Open MPI is
> installed in exactly the same filesystem location on the node where
> mpirun is invoked and the back-end compute nodes.
> FWIW, you can also use the --prefix argument to mpirun; the "/opt/
> openmpi/bin/mpirun ..." behavior is a shortcut for that same behavior
> (we emulated the idea of using the full pathname to mpirun from HP MPI).
> Additionally, you can force Open MPI to use the --prefix behavior by
> default if you configure/build Open MPI with the --enable-mpirun-
> prefix-by-default configure switch.
> Hope that helps!
> On Aug 3, 2009, at 7:35 AM, Tomislav Maric wrote:
>> Thank you Dominik for all your help!!
>> I've solved the problem: execute : printenv > ~/.ssh/environment
>> edit /etc/ssh/sshd_config and set PermitUserEnvironment to "yes" and
>> check that UseLogin is set to "no"
>> scp hostname ~/.ssh/environment user_at_hostname:~/.ssh/environment
>> edit sshd_config on the other host and set the same things.
>> Works like a charm!
>> Tomislav
>> Dominik Táborský wrote:
>>> I'm sorry, I can't help you with NFS. I have never had it on my
>>> network.
>>> Good luck anyway... :)
>>> Tomislav Maric píše v Ne 02. 08. 2009 v 20:18 +0200:
>>>> Dominik Táborský wrote:
>>>>> Okay, now it's getting more confusing since I just found out that
>>>>> it
>>>>> somehow stopped working for me!
>>>>> Anyway, let's find a solution.
>>>>> I found out that there is difference between
>>>>> ssh node1 echo $PATH
>>>>> and
>>>>> ssh node1 'echo $PATH'
>>>>> These command give you different output. 'man ssh' states that it
>>>>> sets
>>>>> its own PATH variable right before the user logs in but after the
>>>>> connection is established. This variable is set during compilation.
>>>>> I am using dropbear as SSH2 server so I won't be able to guide
>>>>> you if
>>>>> you're using OpenSSH as a server, but the manpages should be
>>>>> sufficient.
>>>>> Look into man ssh and man ssh_config. You should create files
>>>>> ~/.ssh/rc
>>>>> OR ~/.ssh/config OR ~/.ssh/environment. Setting it up in one of
>>>>> these
>>>>> files should be enough.
>>>>> I will probably recompile dropbear with new default PATH.
>>>>> Anyway, I am sure it used to work for me and I have no idea why it
>>>>> stopped.
>>>>> If you'd need more help, just ask :-)
>>>>> Dr. Eddy
>>>> Thank you very much!! I'm also finding out about those files and I'm
>>>> using OpenSSH. I'll try and configure it to work. The weirdest
>>>> thing is
>>>> that people who use Ubuntu on OpenFOAM forum just had to comment a
>>>> line
>>>> in .bashrc that returns if the bash is run in non-interactive mode.
>>>> I just don't get it. Let me ask you just one thing, before the
>>>> next 5-6
>>>> hours of fighting with config files:
>>>> what about NFS?
>>>> What if I export the directory? On OMPI pages is written that nfs
>>>> simplifies things. I'm noob in networking so I don't know if this
>>>> would
>>>> benefit me.
>>>> If I edit ~/.ssh/environment then I have to manually set
>>>> and there are dozens of variables to set. I think I'll try the rc
>>>> file
>>>> first.
>>>> Thank you again!
>>>> Best regards,
>>>> Tomislav
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