[petsc-users] block ILU(K) is slower than the point-wise version?

[Hong]

Fande :

> I found one issue on my side. The preallocation is not right for the BAIJ
> matrix.  Will this slow down MatLUFactor and MatSolve?
>

preallocation  should not affect ilu(0).

>
> How to converge AIJ to BAIJ using a command-line option?
>
-mat_type aij or -mat_type baij

Hong

>
>
> Fande,
>
> On Tue, Mar 7, 2017 at 3:26 PM, Jed Brown <jed at jedbrown.org> wrote:
>
>> "Kong, Fande" <fande.kong at inl.gov> writes:
>>
>> > On Tue, Mar 7, 2017 at 3:16 PM, Jed Brown <jed at jedbrown.org> wrote:
>> >
>> >> Hong <hzhang at mcs.anl.gov> writes:
>> >>
>> >> > Fande,
>> >> > Got it. Below are what I get:
>> >>
>> >> Is Fande using ILU(0) or ILU(k)?  (And I think it should be possible to
>> >> get a somewhat larger benefit.)
>> >>
>> >
>> >
>> > I am using ILU(0). Will it be much better to use ILU(k>0)?
>>
>> It'll be slower, but might converge faster.  You asked about ILU(k) so I
>> assumed you were interested in k>0.
>>
>
>
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