[petsc-users] PETSc Gather

[TAY wee-beng]

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?

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 <mailto: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
>
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