about MPI_Comm_size(PETSC_COMM_WORLD,&size)

[Satish Balay]

As long as you plan to run multiple MPI procs on the same machine,
'localonly' option is appropriate and should be fine.

If you wish to avoid using this option - then you probably need to run
the mpd configuration tool and set things up correctly [don't know
exactly what that would be]. Its certainly not something which
requires a reinstall of mpich.

Satish

On Thu, 26 Oct 2006, Yixun Liu wrote:

> Hi,
> 
> I tried what you said and mpiexec - n 2 localonly is ok. Do I need to reinstall the MPICH2?
> 
> Best,
> 
> Yixun
> ----- Original Message ----- 
> From: "Satish Balay" <balay at mcs.anl.gov>
> To: <petsc-users at mcs.anl.gov>
> Sent: Thursday, October 26, 2006 1:21 PM
> Subject: Re: about MPI_Comm_size(PETSC_COMM_WORLD,&size)
> 
> 
> > 
> > 
> > On Thu, 26 Oct 2006, Yixun Liu wrote:
> > 
> >> Hi,
> >> Can I compiler and link it in VC enviroment and then copy the .exe to a directory. 
> > 
> > you can just go to the dir which has the executable. [copy is not necessary]
> > 
> >> Then, at command line run mpiexec -n 2 xxx.exe? 
> > 
> > yes
> > 
> >> I try it, but the error is "Credentials for yxliu rejected
> >> connecting to dmrc-6700512 Aborting: Unable to connect to
> >> dmrc-6700512". I have used wmpiregister to register the accout
> >> correctly.
> > 
> > 
> > Sounds like your mpi install is not setup properly. I'm guessing
> > you are using mpich2. I don't know enough about this version.
> > 
> > Can you check if any of the following work?
> > executable
> > mpiexec -n 1 executable
> > mpiexec -n 2 executable
> > mpiexec -n 2 -localonly executable
> > 
> > Satish
> >
> 
>