k>>>
>>> 
>> 
>> 
>>
>> 
> So ... computation of the preconditioner is actually called by KSPSetUp() 
> instead of PCGetFactoredMatrix(prec,&M)?

Yes.
>
> Could you please tell me when the system matrix be factorized (incompletely)? 
> thank you.

During a call of KSPSetUp().

Hong

>
> Zhifeng
>
>


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