KSPCR with PCILU generally slower with v2.3.3 than with 2.3.0

[Barry Smith]

   Make sure you have a PetscFinalize() that the code reaches.

    Barry

On Jun 11, 2008, at 11:18 AM, Etienne PERCHAT wrote:

> Hi Barry,
>
> I don't understand why but -log_summary does not produce anything.
> I've checked that the code has been compiled with DPETSC_USE_LOG.
>
> Any tips ?
> Thanks,
>
> Etienne
>
> -----Message d'origine-----
> De : owner-petsc-users at mcs.anl.gov [mailto:owner-petsc-users at mcs.anl.gov 
> ] De la part de Barry Smith
> Envoyé : vendredi 6 juin 2008 16:39
> À : petsc-users at mcs.anl.gov
> Objet : Re: KSPCR with PCILU generally slower with v2.3.3 than with  
> 2.3.0
>
>
>   If you run both cases with -log_summary you'll see where it is
> spending more time.
> Mail along the -log_summary output.
>
>    Barry
>
> On Jun 6, 2008, at 6:27 AM, Etienne PERCHAT wrote:
>
>> Hi Barry,
>>
>> Using -ksp_truemonitor does not change anything. I have the same
>> number of iterations in the 3 cases (v2.3.3p8 + true_monitor,
>> v2.3.3, v2.3.0) and the same final residual norm but with v2.3.0 the
>> code is slightly faster.
>>
>> I have to stress that I also monitor convergence with KSPMonitorSet
>> in order to store the "best residual" and the "best solution" (I did
>> not test if it is still useful in 2.3.3).
>>
>> Etienne
>>
>> -----Message d'origine-----
>> De : owner-petsc-users at mcs.anl.gov [mailto:owner-petsc-users at mcs.anl.gov
>> ] De la part de Barry Smith
>> Envoyé : jeudi 5 juin 2008 20:28
>> À : petsc-users at mcs.anl.gov
>> Objet : Re: KSPCR with PCILU generally slower with v2.3.3 than with
>> 2.3.0
>>
>>
>>   This could also be the result of changes in the way we test for
>> convergence.
>> Try with -ksp_truemonitor and see if it is using the same number of
>> iterations
>> to converge.
>>
>>   Barry
>>
>> On Jun 5, 2008, at 5:35 AM, Etienne PERCHAT wrote:
>>
>>> Hello,
>>>
>>> I'm solving MPIBAIJI matrices using KSPCR preconditioned by a
>>> PCBJACOBI
>>> between sub domains and PCILU with a fill ratio of 1 on each sub
>>> domain.
>>>
>>> Solving exactly the same linear systems, I notice that the solution
>>> is
>>> slower using v2.3.3p8 than with v2.3.0.
>>> The behavior is not very clear: v2.3.3p8 is generally slower (10 %  
>>> or
>>> more) but on some systems it happen to be really faster (may be 40
>>> %).
>>>
>>> Unhappily in my case at the end I'm always slower ...
>>>
>>> Did somebody noticed such behavior? Is there changes if I upgrade to
>>> current 2.3.3p13 version (I've seen a fix:" fix error with using
>>> mpirowbs & icc & ksp_view") ?
>>>
>>> Thanks,
>>> Etienne Perchat
>>>
>>>
>>
>>
>>
>
>
>