[petsc-users] PETSc Gather

[Matthew Knepley]

On Tue, Apr 17, 2012 at 7:07 AM, TAY wee-beng <zonexo at gmail.com> wrote:

>  Hi,
>
> I'm not sure if this is a naive question, but is there any speed or
> performance difference when using VecScatterCreateToZero or similar
> routine, compared to MPI standard routines such as mpi_gather, mpi_gatherv
> etc?
>

No.

   Matt


> Yours sincerely,
>
> TAY wee-beng
>
>
> On 16/4/2012 6:26 PM, Jed Brown wrote:
>
>
>
> On Mon, Apr 16, 2012 at 11:25, Abraham Taicher <ataicher at ices.utexas.edu>wrote:
>
>>  Hi,
>>
>> I have a parallel vector spread across all processors that I would like
>> to gather into a single processor, say the root processor.  Is there PETSc
>> functionality to do this? I tried looking for a PETSc gather function but
>> the one I found, VecStrideGather<http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Vec/VecStrideGather.html>,
>> does not seem to apply.  Should I simply use the MPI routine MPI_Gather?
>>
>
>
> http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Vec/VecScatterCreateToZero.html
>
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120417/426b96d6/attachment.htm>