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

[Matthew Knepley]

On Thu, Dec 23, 2010 at 7:46 AM, Mark F. Adams <adams at pppl.gov> wrote:

> What other games are there for scaleable partitioners?
>
> Scotch looks interesting from their web page, does anyone have any
> experience with it?  They seem to claim 2K processor runs which is about one
> or two orders short of showing that it might scale.
>
> N.B. I've tried Chaco but found it was not even parallel.


Also, I do not know if any other package does multiobjective partitioning
like ParMetis does.

   Matt


>
> Mark
>
>
> On Dec 23, 2010, at 8:44 AM, Barry Smith wrote:
>
>
>> 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
>>>> ---------------
>>>> CIMEC (INTEC/CONICET-UNL)
>>>> Predio CONICET-Santa Fe
>>>> Colectora RN 168 Km 472, Paraje El Pozo
>>>> Tel: +54-342-4511594 (ext 1011)
>>>> Tel/Fax: +54-342-4511169
>>>>
>>>>
>>>>
>>>> --
>>>> 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
>>>>
>>>
>>>
>>
>>
>


-- 
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
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