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Subject: Re: [OMPI users] Setting up Open MPI to run on multiple servers
From: Rayne (lancer6238_at_[hidden])
Date: 2008-08-13 21:45:32


Hi,

I tried to see if I can get my 64-bit PC to execute 64.out, and my 32-bit server to execute 32.out, by using

mpirun --bynode -np 1 64.out : -np 1 32.out

My hostfile contains:

localhost
IP address of server

However, I got the following error message:

"Failed to find the following executable:

Host: (Name of server)
Executable: 32.out

Cannot continue
-----------------------------------------------
mpirun noticed that job rank 0 with PID 12320 on node localhost.localdomain exited on signal 15 (Terminated)."

I don't understand why the server cannot find 32.out, when it is in the shared folder and I'm using mpirun in the shared folder's location.

Thank you.

Regards,
Rayne

--- On Wed, 13/8/08, jody <jody.xha_at_[hidden]> wrote:

> From: jody <jody.xha_at_[hidden]>
> Subject: Re: [OMPI users] Setting up Open MPI to run on multiple servers
> To: lancer6238_at_[hidden], "Open MPI Users" <users_at_[hidden]>
> Date: Wednesday, 13 August, 2008, 6:26 PM
> An application compiled for 64-bit *IS* different from a
> 32-bit.
> But if both your 64-bit server and and 32-bit PC have
> compatible
> processor types,
> you can compile on the PC and run the program on the
> server.
> (as i told you in my previous mail)
>
> Jody
>
> On Wed, Aug 13, 2008 at 10:15 AM, Rayne
> <lancer6238_at_[hidden]> wrote:
> > Hi,
> >
> > I'm starting to think that the main problem lies
> > in the 32-bit server not being able to execute the program
> > compiled by the 64-bit PC, and vice versa. I just noticed
> > that the sizes of the executables created by the PC and
> > server are different - the one created by the 64-bit PC is
> > 3204 bytes larger. Does that imply that the programs are
> > somewhat different?
> >
> > I compiled the program using the server and created
> > 32.out, then I compiled the program using the PC and created
> > 64.out.
> >
> > When I used the PC to run 32.out locally, I get the
> > error:
> > "error while loading shared libraries:
> > libmpi.so.0: wrong ELF class: ELFCLASS64"
> > But when I used the PC to run 64.out locally, it ran
> > fine.
> >
> > I got the following error message when I ran 64.out on
> > the server locally:
> >
> > "Could not execute the executable
> > "./a.out": Exec format error
> >
> > This could mean that your PATH or executable name is
> > wrong, or that you do not have the necessary permissions.
> > Please ensure that your executable is able to be found and
> > executed."
> >
> > However, when I used the server to run 32.out locally,
> > it ran fine.
> >
> > Does this mean that the errors I got are not due to
> > incorrect setup of the "MPI network", but the
> > incompatibility issues of programs compiled by 32-bit and
> > 64-bit machines?
> >
> > Thank you.
> >
> > Regards,
> > Rayne
> >
> > --- On Wed, 13/8/08, jody <jody.xha_at_[hidden]>
> > wrote:
> >
> >> From: jody <jody.xha_at_[hidden]>
> >> Subject: Re: [OMPI users] Setting up Open MPI to
> >> run on multiple servers
> >> To: lancer6238_at_[hidden], "Open MPI
> >> Users" <users_at_[hidden]>
> >> Date: Wednesday, 13 August, 2008, 2:56 PM
> >> Hi Rayne
> >>
> >> SSH is used to start processes on the other
> >> machines -
> >> that's why you
> >> must configure ssh to work without passwords.
> >>
> >> As to your 64/32 bit problem: a program compiled
> >> for 32
> >> bits usually
> >> works on a 64 bit machine,
> >> but not vice versa. There are methods to start MPI
> >> such
> >> that different
> >> executables are started
> >> on different machines, but iguess the easiest way
> >> to get
> >> things going
> >> would be to use
> >> 32 bit versions of your program on all your
> >>machines.
> >>
> >> Jody

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