[petsc-users] Strange error(?) message

[Mohammad Mirzadeh]

I was reading the FAQ list when I came across the following:

http://www.mcs.anl.gov/petsc/documentation/faq.html#key

When calling MatPartitioningApply() you get a message Error! Key 16615 not
found The graph of the matrix you are using is not symmetric. You must use
symmetric matrices for partitioning.

Is this a limitation on ParMetis side? I set up the adjacency matrix based
on the discretization that I will be performing on the grid which is
non-symmetric; both numerically and structurally. What's the solution here?
Make an "approximate" adjacency matrix that sort of looks like
(structurally) my discretization but is symmetric? What I don't understand
is my matrix IS non-symmetric when the code runs on coarser grids!

Also, I was reading the FAQ hoping I can find something regarding using gdb
in parallel. I found this: http://scicomp.stackexchange.com/a/410/485 but
I'm not sure how I should be using gdb in parallel. Could you (maybe Matt?)
please explain a little bit?

Thanks

On Tue, Apr 10, 2012 at 12:08 AM, Mohammad Mirzadeh <mirzadeh at gmail.com>wrote:

> Just built petsc-dev and it did not help. I'm going to look into the code
> to see if my graph is "ill-formed" in some sense. Just hope the problem is
> from my side not a real bug in ParMetis!
>
>
>
> On Mon, Apr 9, 2012 at 8:46 PM, Mohammad Mirzadeh <mirzadeh at gmail.com>wrote:
>
>> ok. Thanks Jed. I'll try petsc-dev to see if it fixes the problem.
>>
>> Thanks everyone.
>>
>>
>> On Mon, Apr 9, 2012 at 8:42 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
>>
>>> On Mon, Apr 9, 2012 at 22:37, Mohammad Mirzadeh <mirzadeh at gmail.com>wrote:
>>>
>>>> Thanks Sean. I'm using Petsc 3.2-p6 along with ParMetis 4.0.2. Since
>>>> this was not supported with 3.2-p6, and previous versions had bugs, I built
>>>> parmetis myself and used --with-parmetis-include and --with-parmetis-lib
>>>> flags to build petsc.
>>>>
>>>> Should I switch to petsc-dev?
>>>>
>>>
>>> Yes, and use --download-metis --download-parmetis because the version
>>> upstream has some bugs for which the patches have not been applied.
>>>
>>
>>
>
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