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Subject: Re: [OMPI users] Problem with running openMPI program
From: Ankush Kaul (ankush.rkaul_at_[hidden])
Date: 2009-04-28 13:29:17


Thanks everyone(esp Gus and Jeff) for the support and guidance. We are
almost at the verge of completing our project which could have not been
possible without all u guys.

I would like to know one more thing, what are real life applications that i
can use the cluster for (except mathematical computation)? Can i use if for
my web server, if yes then how?

On Fri, Apr 24, 2009 at 12:01 AM, Jeff Squyres <jsquyres_at_[hidden]> wrote:

> Excellent answer. One addendum -- we had a really nice FAQ entry about
> this kind of stuff on the LAM/MPI web site, which I was horrified to see
> that we had not copied to the Open MPI site. So I copied it over this
> morning. :-)
>
> Have a look at these 3 FAQ (brand new) entries:
>
>
> http://www.open-mpi.org/faq/?category=building#overwrite-pre-installed-ompi
> http://www.open-mpi.org/faq/?category=building#where-to-install
>
> http://www.open-mpi.org/faq/?category=running#do-i-need-a-common-filesystem
>
> Hope that helps.
>
>
>
>
> On Apr 23, 2009, at 10:34 AM, Gus Correa wrote:
>
> Hi Ankush
>>
>> Jeff already sent clarifications about image processing,
>> and the portable API nature of OpenMPI (and other MPI implementations).
>>
>> As for "mpicc: command not found" this is again a problem with your
>> PATH.
>> Remember the "locate" command? :)
>> Find where mpicc is installed, and put that directory on your PATH.
>>
>> In any case, I would suggest that you choose a central NFS mounted
>> file system on your cluster master node, and install OpenMPI there,
>> configuring and building it from source (not from yum).
>> If this directory is mounted on all nodes, the same OpenMPI will be
>> available on all nodes.
>> This will give you a single standard version of OpenMPI across the board.
>>
>> Clustering can become a very confusing and tricky business if you
>> have heterogeneous nodes, with different OS/Linux versions,
>> different MPI versions etc, software installed in different locations
>> on each node, etc, regardless of whether you use mpiselector or
>> you set the PATH variable on each node, or you use environment modules
>> package, or any other technique to setup your environment.
>> Installing less software, rather than more software,
>> and doing so in a standardized homogeneous way across all cluster nodes,
>> will give you a cleaner environment, which is easier to understand,
>> control, upgrade, and update.
>>
>> A relatively simple way to install a homogeneous cluster is
>> to use the Rocks Clusters "rolls" suite,
>> which is free and based on CentOS.
>> It will probably give you some extra work in the beginning,
>> but may be worthwhile in the long run.
>> See this:
>> http://www.rocksclusters.org/wordpress/
>>
>>
>> My two cents.
>>
>> Gus Correa
>> ---------------------------------------------------------------------
>> Gustavo Correa
>> Lamont-Doherty Earth Observatory - Columbia University
>> Palisades, NY, 10964-8000 - USA
>> ---------------------------------------------------------------------
>>
>> Ankush Kaul wrote:
>> > @Gus, Eugene
>> > I read all you mails and even followed the same procedure, it was blas
>> > that was giving the problem.
>> >
>> > Thanks
>> >
>> > I am again stuck on a problem, i connected a new node to my cluster and
>> > installed CentOS 5.2 on it. after that i use yum to install
>> > openmpi,openmpi-libs and openmpi-devel sucessfully.
>> >
>> > But still when i run mpicc command it gives me error :
>> > /bash: mpicc: command not found/
>> >
>> > i found out there is a command *mpi-selector* but dont know hoe to use
>> it.
>> > Is this a new version of openmpi? how do i configure it?
>> >
>> >
>> > ------------------------------------------------------------------------
>> >
>> > _______________________________________________
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>> > users_at_[hidden]
>> > http://www.open-mpi.org/mailman/listinfo.cgi/users
>>
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>
>
> --
> Jeff Squyres
> Cisco Systems
>
>
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