Does Petsc built with MPICH2 work in a single processor box?

[Barry Smith]

   If you have multiple people wanting to run your code on single  
processes, it is probably worth
your while to build another PETSC_ARCH using --with-mpi=0 to simplify  
handing them the final
program.

    Barry

On Oct 11, 2008, at 9:07 PM, Thuc Bui wrote:

> Hi Barry and Matt,
>
> Yes, I do not have proper MPI authentication to run on this single  
> processor
> machine, which has MPICH2 installed. However, I do not expect the  
> users on
> this type of machine needs to install MPICH2 to run my Petsc app.  
> So, I went
> to another single processor PC, which has no MPICH2 installed, ran  
> my Petsc
> app. It complains that mpich2mpi.dll and mpich2.dll are missing. So,  
> I just
> copied these DLL's to a directory on the PATH then my Petsc app  
> would run
> fine.
>
> Thank you both again for your help,
> Thuc
>
> -----Original Message-----
> From: owner-petsc-users at mcs.anl.gov [mailto:owner-petsc-users at mcs.anl.gov 
> ]
> On Behalf Of Barry Smith
> Sent: Saturday, October 11, 2008 5:52 PM
> To: petsc-users at mcs.anl.gov
> Subject: Re: Does Petsc built with MPICH2 work in a single processor  
> box?
>
>
>    Looks like you may not have the proper MPICH demons running on
> this "uniprocessor"
> machine?
>
>    Barry
>
> On Oct 11, 2008, at 6:03 PM, Thuc Bui wrote:
>
>>
>> Hi all,
>>
>> I am able to build Petsc-2.3.3-p15 with MPICH2 under Windows and
>> make it a
>> DLL. It works great with my app in a dual core laptop. However, when
>> the
>> same executable runs on a uniprocessor windows box, it gives me the
>> following errors:
>>
>> ...
>> [0] Error creating mpiexec process...2
>> [0] launchMpiexecProcess failed
>> Fatal error in MPI_Init: Other MPI error, error stack:
>> MPIR_Init_thread(294): Initialization failed
>> MPID_Init(82)........: channel initialization failed
>> MPID_Init(383).......: PMI_Get_id returned 1
>> ...
>>
>> Are these errors due to PatscInitialize() failing to initialize MPI
>> on a
>> single processor box?
>>
>> If this is the case, is there a way in PetscInitialize or else where
>> to turn
>> off MPI without having to recompile Petsc with the option --with-
>> mpi=0?
>>
>> Many thanks in advance for your help,
>> Thuc Bui
>>
>
>