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Subject: Re: [OMPI users] Running simple MPI program
From: jody (jody.xha_at_[hidden])
Date: 2010-10-23 11:13:25


Hi Brandon
Does it work if you try this:
  mpirun -np 2 hostfile hosts.txt ilk

(see http://www.open-mpi.org/faq/?category=running#simple-spmd-run)

jody

On Sat, Oct 23, 2010 at 4:07 PM, Brandon Fulcher <minguo_at_[hidden]> wrote:
> Thank you for the response!
>
> The code runs on my own machine as well.  Both machines, in fact.  And I did
> not build MPI but installed the package from the ubuntu repositories.
>
> The problem occurs when I try to run a job using two machines or simply try
> to run it on a slave from the master.
>
> the actual command I have run along with the output is below:
>
> mpirun -hostfile hosts.txt ilk
> --------------------------------------------------------------------------
> mpirun noticed that the job aborted, but has no info as to the process
> that caused that situation.
> --------------------------------------------------------------------------
>
> where hosts.txt contains:
> 192.168.0.2 cpu=2
> 192.168.0.6 cpu=1
>
>
> If it matters the same output is given if I define a remote host in the
> command such as (if I am on 192.168.0.2)
> mpirun  -host 192.168.0.6 ilk
>
> Now if I run it locally, the job succeeds.  This works from either cpu.
> mpirun  ilk
>
>
> Thanks in advance.
>
> On Fri, Oct 22, 2010 at 11:59 PM, David Zhang <solarbikedz_at_[hidden]> wrote:
>>
>> since you said you're new to MPI, what command did you use to run the 2
>> processes?
>>
>> On Fri, Oct 22, 2010 at 9:58 PM, David Zhang <solarbikedz_at_[hidden]>
>> wrote:
>>>
>>> your code works on mine machine. could be they way you build mpi.
>>>
>>> On Fri, Oct 22, 2010 at 7:26 PM, Brandon Fulcher <minguo_at_[hidden]>
>>> wrote:
>>>>
>>>> Hi, I am completely new to MPI and am having trouble running a job
>>>> between two  cpus.
>>>>
>>>> The same thing happens no matter what MPI job I try to run, but here is
>>>> a simple 'hello world' style program I am trying to run.
>>>>
>>>> #include <mpi.h>
>>>> #include <stdio.h>
>>>>
>>>> int main(int argc, char **argv)
>>>> {
>>>>   int *buf, i, rank, nints, len;
>>>>   char hostname[256];
>>>>
>>>>   MPI_Init(&argc,&argv);
>>>>   MPI_Comm_rank(MPI_COMM_WORLD, &rank);
>>>>   gethostname(hostname,255);
>>>>   printf("Hello world!  I am process number: %d on host %s\n", rank,
>>>> hostname);
>>>>   MPI_Finalize();
>>>>   return 0;
>>>> }
>>>>
>>>>
>>>> On either CPU, I can successfully compile and run, but when trying to
>>>> run the program using two CPUS it fails with this output:
>>>>
>>>>
>>>> --------------------------------------------------------------------------
>>>> mpirun noticed that the job aborted, but has no info as to the process
>>>> that caused that situation.
>>>>
>>>> --------------------------------------------------------------------------
>>>>
>>>>
>>>> With no additional information or errors,  What can I do to go about
>>>> finding out what is wrong?
>>>>
>>>>
>>>>
>>>> I have read the FAQ and followed the instructions.  I can ssh into the
>>>> slave without entering a password and have the libraries installed on both
>>>> machines.
>>>>
>>>> The only thing pertinent I could find is this faq
>>>> http://www.open-mpi.org/faq/?category=running#missing-prereqs  but I do not
>>>> know if it applies since I have installed open mpi from the Ubuntu
>>>> repositories and assume the libraries are correctly set.
>>>>
>>>> _______________________________________________
>>>> users mailing list
>>>> users_at_[hidden]
>>>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>>>
>>>
>>>
>>> --
>>> David Zhang
>>> University of California, San Diego
>>
>>
>>
>> --
>> David Zhang
>> University of California, San Diego
>>
>> _______________________________________________
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>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>
>
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