[petsc-users] Are there any functions (objects ) for scattering and gathering 64-bit integers just like VecScatter for PetscScalar?

[Matthew Knepley]

On Fri, Nov 2, 2012 at 6:24 PM, Fande Kong <fd.kong at siat.ac.cn> wrote:

> I got it. You still didn't fix the bugs that I encountered a few months
> ago. All current MPI implementations couldn't support the function
> MPI_Accumulate or others well with one-sided communication when data is
> large.  Thus, I have to hack your code (PetscSF) to use point-point
> communications. But  I find it's not so easy.


Can't you just use MPICH since it does not have bugs? What is the point of
using a buggy MPI?

  Thanks,

     Matt


>
> don't you want to change to use point-point?
>
> On Fri, Nov 2, 2012 at 4:04 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
>
>> The current implementation uses one-sided because that was a natural. I
>> need a solid day to implement without one-sided. As stated in the issue I
>> posted, this is necessary because Open MPI data types are broken.
>>
>>
>> On Fri, Nov 2, 2012 at 5:01 PM, Fande Kong <fd.kong at siat.ac.cn> wrote:
>>
>>> did you remove horrible one-side communication? and did you make some
>>> tests with using 64-bit integers?
>>>
>>>
>>> On Fri, Nov 2, 2012 at 3:50 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
>>>
>>>> I am using PetscSF for this. You would need petsc-dev and the current
>>>> implementation requires an MPI with non-broken data types.
>>>>
>>>>
>>>> https://bitbucket.org/petsc/petsc-dev/issue/9/implement-petscsf-without-one-sided
>>>>
>>>> Here are some (dated) notes about the communication model.
>>>> http://59A2.org/files/StarForest.pdf
>>>>
>>>>
>>>> On Fri, Nov 2, 2012 at 4:41 PM, Fande Kong <fd.kong at siat.ac.cn> wrote:
>>>>
>>>>> Hi all,
>>>>>
>>>>> Are there any functions (objects ) for scattering and gathering 64-bit
>>>>> integers just like VecScatter for PetscScalar? The VecScatter is very
>>>>> useful for managing communication for PetscScalar. But I can't find any
>>>>> functions or objects to do similar things for PetscInt. Any suggestions?
>>>>>
>>>>> Regards,
>>>>> --
>>>>> Fande Kong
>>>>> ShenZhen Institutes of Advanced Technology
>>>>> Chinese Academy of Sciences
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>
>>>
>>> --
>>> Fande Kong
>>> ShenZhen Institutes of Advanced Technology
>>> Chinese Academy of Sciences
>>>
>>>
>>
>
>
> --
> Fande Kong
> ShenZhen Institutes of Advanced Technology
> Chinese Academy of Sciences
>
>


-- 
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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