[petsc-dev] PCASM+KSPGMRES

[Karl Rupp]

Hi,

 > Once I get to the office, I will prepare a short list of all the 
sequence of calls to PETSc and settings that I use for that case. With 
that in principle, you should be able to reproduce the scenario, once 
you get a  sparsity pattern, an actual matrix and a rhs vector.

Thanks. I hope that the options suffice in order to reproduce it with 
one of our examples.


> Actually, I can also send you files with the Petsc matrix, the vector and the sparsity pattern data on, say, 2 processors so that you can try to read them in and solve the exact same system...

I'll try to reproduce with our examples first and let you know if I need 
the vector and matrix data.

Best regards,
Karli


> On Jan 22, 2014, at 10:07 AM, Karl Rupp <rupp at mcs.anl.gov> wrote:
>
>> Hi,
>>
>>> Well, I don't usually use PETSc  runtime options. I have only a subset of parameters (PC types, KSP types, etc.) which are interfaced by my solver and exposed to the end-user. Other few settings (matrix types for instance) are hardcoded in some objects (which my linear system solver interface makes use of).
>>
>> Okay, which parameters are these? Apparently you set PCASM and KSPGMRES at some point, but are there any others I need to be aware of?
>>
>>
>>> I can setup a testcase, but it cannot be too simple. You'll have to install my code to run it. I can setup a script for this. If you want to give it a try, I'll send you some instructions tomorrow (here is night already).
>>
>> I think it's easier if I try to reproduce it directly with some of our examples first. If I fail to reproduce it, I'll ask you for a test case :-)
>>
>> Best regards,
>> Karli