[petsc-dev] PC ML Setup Error

[Barry Smith]

  We need a "hard" reset for PCMG that actually destroys all the level information allowing it to be rebuilt with a different number of levels or we could change management of PCMG from an array of level information to a linked list allowing more to be added or some to be removed without affecting the others.

  I don't want to just remove all the levels and build a totally new one because then any specific solver options that may have been set for the various levels will be lost. This was the reason for the introduction of KSP and PCReset() so that info in general is not lost, but it is not a perfect solution in complicated situations like MG where the number of levels may change.

   Barry


On Jun 30, 2011, at 4:29 AM, Dave May wrote:

> Is it possible to destroy the PC after each time step?
> 
> 
> On 30 June 2011 10:22,  <domenico.borzacchiello at univ-st-etienne.fr> wrote:
>> Thank you for pointing that out.
>> Is there any workaround to deal with this for the time being?
>> 
>> Domenico
>> 
>> 
>>> On Wed, Jun 29, 2011 at 08:18, Matthew Knepley <knepley at gmail.com> wrote:
>>> 
>>>> Is this the bad interaction Jed found between PCMG and ML?
>>> 
>>> 
>>> Yes, I think this is ML changing the number of levels. There is an email
>>> thread about this.
>>> 
>> 
>> Here, it has not been resolved.
>> 
>> 
>>