[petsc-users] ISAllGather withoutduplicates

[Blaise Bourdin]

On Feb 17, 2012, at 2:45 PM, Matthew Knepley wrote:

> On Fri, Feb 17, 2012 at 2:39 PM, Blaise Bourdin <bourdin at lsu.edu> wrote:
>> The way I do it right now is
>>  ierr = ISGetTotalIndices(csIS,&labels);CHKERRQ(ierr);
>>  ierr = ISGetSize(csIS,&num_cs_global);CHKERRQ(ierr);
>> 
>> I would violate PETSc semantics here since you are going to destroy csIS anyway:
>> 
>>   PetscSortRemoveDupsInt(&num_cs_global, labels);
> 
>      PetscSortRemoveDupsInt(&num_cs_global, (PetscInt *) labels);

Facepalm...

Blaise

> 
>       Matt
>  
> That's what I was thinking too, but PetscSortRemoveDupsInt expect a PetscInt* not a const PetscInt*
> 
> It's not a big deal, I can live with the 2 copies, considering that the local size of the IS is going to be quite small.
> 
> Blaise
> 
> 
> 
> 
>>   ISCreateGeneral(comm, num_cs_global, labels, PETSC_COPY_VALUES, &csIS_global);
>>  
>>  ierr = ISRestoreTotalIndices(csIS,&labels);CHKERRQ(ierr);
>> 
>>    Matt
>>  
>> 
>> Blaise
>> --
>> Department of Mathematics and Center for Computation & Technology
>> Louisiana State University, Baton Rouge, LA 70803, USA
>> Tel. +1 (225) 578 1612, Fax  +1 (225) 578 4276 http://www.math.lsu.edu/~bourdin
>> 
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>> 
>> -- 
>> 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
> 
> -- 
> Department of Mathematics and Center for Computation & Technology
> Louisiana State University, Baton Rouge, LA 70803, USA
> Tel. +1 (225) 578 1612, Fax  +1 (225) 578 4276 http://www.math.lsu.edu/~bourdin
> 
> 
> 
> 
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> 
> -- 
> 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

-- 
Department of Mathematics and Center for Computation & Technology
Louisiana State University, Baton Rouge, LA 70803, USA
Tel. +1 (225) 578 1612, Fax  +1 (225) 578 4276 http://www.math.lsu.edu/~bourdin







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