[petsc-users] updated version / slower execution

[Barry Smith]

  You need to run both with -log_summary to see if some part of the code is going slower.

  But, my guess is because of the way we changed the default convergence criteria for linear solves. Run both versions with -ksp_monitor and see if they are converging the same but the new one is taking many more iterations.


   Barry

On Jul 29, 2012, at 11:52 PM, Nakib Haider <nakib.mojojojo at gmail.com> wrote:

> Hello
> 
> I updated from 3.0.0-p12 to 3.3-p2. After updating my code to run on the new version, I noticed that it runs significantly slower on a Intel Core i3-2330M (2.2 GHz) machine (running petsc 3.3-p1) than on an old Pentium Dual-Core CPU T4200  (2.0 GHz) machine (running petsc 3.0.0-p12). The code is not parallel. Any suggestion on why this is happening will greatly help me.
> 
> Thank you
> 
> -- 
> Nakib Haider
> Graduate Student
> MCD 304
> Department of Physics
> University of Ottawa
>