[petsc-dev] What do people want to have working before a petsc-3.2 release?

[Barry Smith]

On Dec 22, 2010, at 9:58 PM, Mark F. Adams wrote:

> I've been concerned for a while that, as Barry says, ParMetis seems orphaned.  I've had problems with scaling ParMetis up on BG for a while. I believe they allocate a PxP (integer) matrix which kills my code (my code is flat MPI but I make sub communicators so that each ParMetis MPI process has the whole node to itself).  Can anyone scale Parmetis up on BG-P?
> 
> Anyway this has been on my wish list for a while so I thought I'd use this opportunity to see if anyone has ideas for a solution.

  Switch to a non-orphaned partitioning package. Just like Microsoft Windows isn't the only game in town, ParMetis isn't the only game in town.

   Barry

> 
> Mark
> 
> On Dec 22, 2010, at 7:50 PM, Matthew Knepley wrote:
> 
>> On Wed, Dec 22, 2010 at 3:02 PM, Lisandro Dalcin <dalcinl at gmail.com> wrote:
>> On 22 December 2010 19:57, Barry Smith <bsmith at mcs.anl.gov> wrote:
>> >
>> > On Dec 22, 2010, at 4:51 PM, Lisandro Dalcin wrote:
>> >
>> >> On 21 December 2010 20:50, Sean Farley <sean at mcs.anl.gov> wrote:
>> >>>>>     fixing/understanding 64-bit checks,
>> >>>>
>> >>>> I think these checks are ok, please report problems.
>> >>>
>> >>> Would it be possible to get ParMetis working with 64bit indices?
>> >>> Sean
>> >>
>> >> This is from parmetis.h
>> >>
>> >> /* Indexes are as long as integers for now */
>> >> #ifdef IDXTYPE_INT
>> >> typedef int idxtype;
>> >> #else
>> >> typedef short idxtype;
>> >> #endif
>> >>
>> >> Have any of you seriously tryied parmetis in 64 bits?
>> >
>> >  Yes, when I noticed that block of code several years ago. Looks like it would be easy to switch to long int but sadly this include is misleading about the simplicity, turns out this typedef beasty is not used throughout the source code consistently.
>> 
>> Damn,
>> 
>> > I sent email about the 64 bit int at that time and got back the response "in a few months". Note that his non-MPI codes may fully support the 64 bit (I'm guessing that is where the $ is so is all he cares about). That was like two years ago.  I consider Parmetis orphaned, not maintained, hence in the HPC world, dead.
>> >
>> 
>> Add to that license issues. A fork in order to maintain and improve it
>> is unlikely.
>> 
>> If this is a big deal, I can mail George directly. He let me fool with the tarball and distribute it
>> with PETSc last time I asked him.
>> 
>>    Matt
>>  
>> --
>> Lisandro Dalcin
>> ---------------
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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
>