Hi Ryan
Another thing:
Have you checked if the mpiexec you call is really the one from your
Open-MPI installation?
Try 'which mpiexec' to find out.
Jody
On Tue, Aug 12, 2008 at 9:36 AM, jody <jody....@gmail.com> wrote:
> Hi Ryan
>
> The message "Lamnodes Failed!" seems to indicate that you still have a
> LAM/MPI installation somewhere.
> You should get rid of that first.
>
> Jody
>
> On Tue, Aug 12, 2008 at 9:00 AM, Rayne <lancer6...@yahoo.com> wrote:
>> Hi, thanks for your reply.
>>
>> I did what you said, set up the password-less ssh, nfs etc, and put the IP
>> address of the server in the default hostfile (in my PC only, the default
>> hostfile in the server does not contain any IP addresses). Then I installed
>> Open MPI in the server under the same directory as my PC, e.g.
>> /usr/lib/openmpi/1.2.5-gcc/
>> All my MPI programs and executables, e.g. a.out are in the shared folder.
>> However, I have trouble running the MPI programs.
>>
>> After compiling my MPI program on my PC, I tried to run it via "mpiexec -n 2
>> ./a.out". However, I get the error message
>>
>> "Failed to find or execute the following executable:
>> Host: (the name of the server)
>> Executable: ./a.out
>>
>> Cannot continue"
>>
>> Then when I tried to run the MPI program on my server after compiling, I get
>> the error:
>>
>> "Lamnodes Failed!
>> Check if you had booted lam before calling mpiexec else use -machinefile to
>> pass host file to mpiexec"
>>
>> I'm guessing that because the server cannot run the MPI program, I can't run
>> the program on my PC as well. Is there some other configurations I missed
>> when using Open MPI on my server?
>>
>> Thank you.
>>
>> Regards,
>> Rayne
>>
>> --- On Tue, 12/8/08, Joshua Bernstein <jbernst...@penguincomputing.com>
>> wrote:
>>
>>> From: Joshua Bernstein <jbernst...@penguincomputing.com>
>>> Subject: Re: [OMPI users] Setting up Open MPI to run on multiple servers
>>> To: lancer6...@yahoo.com, "Open MPI Users" <us...@open-mpi.org>
>>> Date: Tuesday, 12 August, 2008, 8:34 AM
>>> Rayne wrote:
>>> > Hi all,
>>> > I am trying to set up Open MPI to run on multiple
>>> servers, but as I
>>> > have very little experience in networking, I'm
>>> getting confused by the
>>> > info on open-mpi.org, with the .rhosts, rsh, ssh etc.
>>> >
>>> > Basically what I have now is a PC with Open MPI
>>> installed. I want to
>>> > connect it to, say, 10 servers, so I can run MPI
>>> programs on all 11
>>> > nodes. From what I've read, I think I need to
>>> install Open MPI on the
>>> > 10 servers too, and there must be a shared directory
>>> where I keep all
>>> > the MPI programs I've written, so all nodes can
>>> access them.
>>> >
>>> > Then I need to create a machine file on my local PC (I
>>> found a default
>>> > hostfile "openmpi-default-hostfile" in
>>> {prefix}/etc/. Can I use that
>>> > instead so I need not have "-machinefile
>>> machine" with every mpiexec?)
>>> > with the list of the 10 servers. I'm assuming I
>>> need to put down the
>>> > IP addresses of the 10 servers in this file. I've
>>> also read that the
>>> > 10 servers also need to each have a .rhosts file that
>>> tells them the
>>> > machine (i.e. my local PC) and user from which the
>>> programs may be
>>> > launched from. Is this right?
>>> >
>>> > There is also the rsh/ssh configuration, which I find
>>> the most
>>> > confusing. How do I know whether I'm using rsh or
>>> ssh? Is following
>>> > the instructions on
>>> http://www.open-mpi.org/faq/?category=rsh under
>>> > "3: How can I make ssh not ask me for a
>>> password?" sufficient? Does
>>> > this mean that when I'm using the 10 servers to
>>> run the MPI program,
>>> > I'm login to them via ssh? Is this necessary in
>>> every case?
>>> >
>>> > Is doing all of the above all it takes to run MPI
>>> programs on all 11
>>> > nodes, or is there something else I missed?
>>>
>>> More or less. Though the first step is to setup
>>> password-less SSH
>>> between all 11 machines. I'd completely skip the use of
>>> RSH as its very
>>> insecure and shouldn't be used in non-dedicated
>>> cluster, and even
>>> then... You should basically setup SSH so a user can SSH
>>> from one node
>>> to another without specify a password or entering in any
>>> other information.
>>>
>>> Then, the next is to setup NFS. NFS provides you with a way
>>> to share a
>>> directory on one computer, to many other computers avoiding
>>> the hassel
>>> of having to copy all your MPI programs to all of the
>>> nodes. This is
>>> generally as easy as configuring /etc/exports, and then
>>> just mounting
>>> the directory on the other computers. Be Sure you mount the
>>> directories
>>> in the same place on every node though.
>>>
>>> Lastly, give your MPI programs a shot. While you don't
>>> need to have a
>>> hostlist, because you can specify the hostname (or IPs). on
>>> the mpirun
>>> command line. But you your case its likely a good idea.
>>>
>>> Hope that gets you started...
>>>
>>> -Joshua Bernstein
>>> Software Engineer
>>> Penguin Computing
>>
>>
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