o:petsc-users@mcs.anl.gov>
> mailto:petsc-users@mcs.anl.gov>>
> Subject: Re: [petsc-users] Does ILU(15) still make sense or should just use
> LU?
>
> Hong, are these results somewhat expected? I don’t see any speed up for using
> 2 processors (maybe I don’t have 2 pr
I cannot believe that I typed: make ex02
Thanks, it works.
-Ling
From: Barry Smith
Date: Friday, March 29, 2024 at 12:43 PM
To: Zou, Ling
Cc: Zhang, Hong , petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Does ILU(15) still make sense or should just use LU?
cd src/ksp/ksp/tutorials make
>
> Best,
>
> -Ling
>
> From: Zhang, Hong
> Date: Thursday, March 28, 2024 at 4:59 PM
> To: Zou, Ling , Barry Smith
> Cc: petsc-users@mcs.anl.gov
> Subject: Re: [petsc-users] Does ILU(15) still make sense or should just use
> LU?
>
> Ling,
&g
Hong
From: Zou, Ling
Sent: Thursday, March 28, 2024 2:34 PM
To: Barry Smith
Cc: Zhang, Hong ; petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Does ILU(15) still make sense or should just use LU?
Thank you. Those are great suggestions. Although I mentioned 1 million DOF, but
we rarely go
, Ling
Sent: Thursday, March 28, 2024 2:34 PM
To: Barry Smith
Cc: Zhang, Hong ; petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Does ILU(15) still make sense or should just use LU?
Thank you. Those are great suggestions. Although I mentioned 1 million DOF, but
we rarely go there, so maybe
-users@mcs.anl.gov
Subject: Re: [petsc-users] Does ILU(15) still make sense or should just use LU?
You may benefit from a literature search on your model AND preconditioners to
see what others have used. But I would try PETSc/MUMPS on the biggest size you
want and see how it goes (better it runs
anl.gov>>
> Cc: Zhang, Hong mailto:hzh...@mcs.anl.gov>>,
> petsc-users@mcs.anl.gov <mailto:petsc-users@mcs.anl.gov>
> mailto:petsc-users@mcs.anl.gov>>
> Subject: Re: [petsc-users] Does ILU(15) still make sense or should just use
> LU?
>
> 1 millio
(the
correct combination of those preconditioners).
-Ling
From: Barry Smith
Date: Thursday, March 28, 2024 at 1:09 PM
To: Zou, Ling
Cc: Zhang, Hong , petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Does ILU(15) still make sense or should just use LU?
1 million is possible for direct
@petsc.dev>>
> Date: Thursday, March 28, 2024 at 11:14 AM
> To: Zou, Ling mailto:l...@anl.gov>>
> Cc: Zhang, Hong mailto:hzh...@mcs.anl.gov>>,
> petsc-users@mcs.anl.gov <mailto:petsc-users@mcs.anl.gov>
> mailto:petsc-users@mcs.anl.gov>>
> Subject:
advice?
-Ling
From: Barry Smith
Date: Thursday, March 28, 2024 at 11:14 AM
To: Zou, Ling
Cc: Zhang, Hong , petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] Does ILU(15) still make sense or should just use LU?
This is a bad situation, the solver is not really converging. This can happen
with
LU(level) is used for saving storage space with more computations. Normally,
> we use level=1 or 2. It does not make sense to use level 15. If you have
> sufficient space, LU would be the best.
> Hong
>
> From: petsc-users <mailto:petsc-users-boun...@mcs.anl.gov>> on beh
Zou, Ling via
petsc-users
Sent: Wednesday, March 27, 2024 4:24 PM
To: petsc-users@mcs.anl.gov
Subject: [petsc-users] Does ILU(15) still make sense or should just use LU?
Hi, I’d like to avoid using LU, but in some cases to use ILU and still
converge, I have to go to ILU(15), i.e
Sent: Wednesday, March 27, 2024 4:24 PM
To: petsc-users@mcs.anl.gov
Subject: [petsc-users] Does ILU(15) still make sense or should just use LU?
Hi, I’d like to avoid using LU, but in some cases to use ILU and still
converge, I have to go to ILU(15), i.e., `-pc_factor_levels 15`. Does it still
Hi, I’d like to avoid using LU, but in some cases to use ILU and still
converge, I have to go to ILU(15), i.e., `-pc_factor_levels 15`. Does it still
make sense, or should I give it up and switch to LU?
For this particular case, ~2k DoF, and both ILU(15) and LU perform similarly in
terms of wal
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