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Subject: Re: [OMPI users] More newbie question: LD_LIBRARY_PATH
From: Tena Sakai (tsakai_at_[hidden])
Date: 2011-01-12 19:41:26

Thank you, Gus.

I agree with what you say about location of OpenMPI software.
Indeed, /usr/local is nfs-mounted to all cluster nodes, albeit
a bit unfortunate name "local." If/when I have a chance to
Set up machines, I will make local really local to each node.


Tena Sakai

On 1/12/11 4:20 PM, "Gus Correa" <gus_at_[hidden]> wrote:

> Tena Sakai wrote:
>> Hi,
>> On a FAQ page (
>> (under 1. What pre-requisites are necessary for running an Open MPI
>> job?), I see an example
>> of LD_LIBRARY_PATH environment variable:
>> LD_LIBRARY_PATH: /opt/openmpi/lib
>> When I compiled the source, a directory /usr/local/lib/openmpi was
>> generated (with many
>> files in it). Given that, do I set D_LIBRARY_PATH to /usr/local/lib or
>> do I set
>> it to /usr/local/lib/openmpi?
>> Thank you.
>> Tena Sakai
>> tsakai_at_[hidden]
> To /usr/local/lib.
> I would suggest not using the default /usr/local to install OpenMPI,
> since it tends to be really local to the machine where you built OpenMPI.
> This will require that you install OpenMPI on all nodes/machines if
> you want to run programs across a network.
> Instead, a simpler way to get OpenMPI available to all nodes,
> although installing only on one of them (say the head node of your
> cluster) is to do it in a directory that is shared, typically via NFS.
> To do so, use the --prefix=/my/shared/OpenMPI/directory option of
> the configure script.
> There are FAQs about this too.
> Anyway, it may depend on your environment also, whether it is a cluster
> with a private subnet (where my suggestion is typically used),
> a bunch of separate computers on a LAN (where the suggestion won't work
> unless you have a shared NFS directory), or other.
> Gus Correa
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