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Subject: Re: [OMPI users] Running simple MPI program
From: Brandon Fulcher (minguo_at_[hidden])
Date: 2010-10-23 12:07:06


Hi Jody, thank you for the response.

Specifying the number of processes in the manner you provided
 (mpirun -np 2 hostfile hosts.txt ilk)

Does indeed succeed. All processes are launched on my local machine which
has two slots. If I change the command to:

 mpirun -np 3 hostfile hosts.txt ilk

It however fails giving the same error.

--------------------------------------------------------------------------
mpirun noticed that the job aborted, but has no info as to the process
that caused that situation.
--------------------------------------------------------------------------

On Sat, Oct 23, 2010 at 10:13 AM, jody <jody.xha_at_[hidden]> wrote:

> 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
> >>
> >> _______________________________________________
> >> users mailing list
> >> users_at_[hidden]
> >> http://www.open-mpi.org/mailman/listinfo.cgi/users
> >
> >
> > _______________________________________________
> > users mailing list
> > users_at_[hidden]
> > http://www.open-mpi.org/mailman/listinfo.cgi/users
> >
>
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