[petsc-users] Performance RH5 vs RH6

[Matthew Knepley]

On Wed, Jul 3, 2013 at 12:16 PM, Mohamad M. Nasr-Azadani
<mmnasr at gmail.com>wrote:

> Hi guys,
>
> Recently, a supercomputer I had been using for the past year, upgraded
> their OS from RH5 to RH6. After recompiling PETSc along with Hypre with
> various compilers (gcc and intel) and mpi packages (openmpi and mvapich2),
> the performance I observe on RH6 is significantly worse, e.g. my code is
> close to 30-40% slower.
>
> My code is a finite-difference Navier-Stokes solver and uses BoomerAMG to
> precondition the pressure Poisson equation.
> I have not done a thorough profiling yet, but I was wondering if you have
> encountered a similar experience before.
>

Nope. The right thing to do is look at -log_summary output.

   Matt


> Thanks,
> Mohamad
>
>
>
>
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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