[petsc-users] GAMG issue

[John Mousel]

Mark,

The matrix is asymmetric. Does this require the setting of an option?
I pulled petsc-dev this morning, so I should have (at least close to) the
latest code.

John

On Wed, Mar 14, 2012 at 10:54 AM, Mark F. Adams <mark.adams at columbia.edu>wrote:

>
> On Mar 14, 2012, at 11:08 AM, John Mousel wrote:
>
> I'm getting the following error when using GAMG.
>
> petsc-dev/src/ksp/pc/impls/gamg/agg.c:508: smoothAggs: Assertion
> `sgid==-1' failed.
>
>
> Is it possible that your matrix is structurally asymmetric?
>
> This code is evolving fast and so you will need to move to the dev version
> if you are not already using it. (I think I fixed a bug that hit this
> assert).
>
>
> When I try to alter the type of aggregation at the command line using
> -pc_gamg_type pa, I'm getting
>
> [0]PETSC ERROR: [1]PETSC ERROR: --------------------- Error Message
> ------------------------------------
> [1]PETSC ERROR: Unknown type. Check for miss-spelling or missing external
> package needed for type:
> see http://www.mcs.anl.gov/petsc/documentation/installation.html#external!
> [1]PETSC ERROR: Unknown GAMG type pa given!
>
> Has there been a change in the aggregation options? I just pulled
> petsc-dev this morning.
>
>
> Yes, this option is gone now.  You can use -pc_gamg_type agg for now.
>
> Mark
>
> John
>
>
>
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