[Trilinos-Users] Slow AztecOO solve time

[Michael A Heroux]

Neal,

Can you provide some more detail?  What do you mean you are calling reset
after each solve?

Also, since you are trying to solve circuit problems, there are special
capabilities in Trilinos to help with these types of problems.  First, if
the problem is small to medium in size (less that 1M equations, this is a
rough guess) you will probably find that KLU (the native sparse direct
solver in the Amesos package in Trilinos) will be faster than iterative
methods.  If you have larger problems, you will want to explore using the
Singleton Filter class in Epetra to eliminate rows/columns that have only a
single entry.  These types of equations often appear in circuit problems.

Mike


On 7/12/07 9:55 AM, "Neal Parsons" <nparsons at umich.edu> wrote:

> Hello,
> 
> I'm a student, and a beginner with Trilinos trying to use the AztecOO
> solver in a SPICE package.   I am getting relatively slow results,
> mostly due to memory allocation and de-allocation. I have tried using
> the AZ_reuse and AZ_keep_info options, but neither seemed to affect the
> solve time.
> 
> I am calling reset after each solve. Is this part of the problem? I
> appreciate any insight.
> 
> Thanks,
> Neal Parsons
> 
> 
> 
> 
> 
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