[petsc-users] compare: performance of petsc_3.3p2 and petsc_dev-r24197

[Matthew Knepley]

On Wed, Aug 22, 2012 at 5:52 AM, Feng Li <fengshen186 at gmail.com> wrote:

> Thank you for your help!
> The log_summary result is in the attachment.
> Please kindly check the attachment!
>

This is not a PETSc change, its a PFLOTRAN change. You have changed the way
the Jacobian is evaluated. Look at the 3.3 log

SNESSolve             18 1.0 1.2947e+01 1.0 1.22e+09 1.0 0.0e+00 0.0e+00
0.0e+00 44 83  0  0  0  93100  0  0  0    94
SNESFunctionEval      39 1.0 3.3130e+00 1.0 0.00e+00 0.0 0.0e+00 0.0e+00
0.0e+00 11  0  0  0  0  24  0  0  0  0     0
SNESJacobianEval      21 1.0 4.2020e+00 1.0 0.00e+00 0.0 0.0e+00 0.0e+00
0.0e+00 14  0  0  0  0  30  0  0  0  0     0
SNESLineSearch        21 1.0 1.8140e+00 1.0 4.82e+06 1.0 0.0e+00 0.0e+00
0.0e+00  6  0  0  0  0  13  0  0  0  0     3
KSPGMRESOrthog       470 1.0 8.2534e-01 1.0 7.25e+08 1.0 0.0e+00 0.0e+00
0.0e+00  3 50  0  0  0   6 59  0  0  0   879

against the dev log

SNESSolve             18 1.0 4.3973e+01 1.0 1.22e+09 1.0 0.0e+00 0.0e+00
0.0e+00 40 83  0  0  0  98100  0  0  0    28
SNESFunctionEval      39 1.0 3.2787e+00 1.0 0.00e+00 0.0 0.0e+00 0.0e+00
0.0e+00  3  0  0  0  0   7  0  0  0  0     0
SNESJacobianEval      21 1.0 3.5318e+01 1.0 0.00e+00 0.0 0.0e+00 0.0e+00
0.0e+00 32  0  0  0  0  79  0  0  0  0     0
SNESLineSearch        21 1.0 1.8007e+00 1.0 4.82e+06 1.0 0.0e+00 0.0e+00
0.0e+00  2  0  0  0  0   4  0  0  0  0     3
KSPGMRESOrthog       470 1.0 8.0665e-01 1.0 7.25e+08 1.0 0.0e+00 0.0e+00
0.0e+00  1 50  0  0  0   2 59  0  0  0   899

The huge difference here comes from the Jacobian evaluation, which we do
not control.

    Matt


> 2012/8/22 Aron Ahmadia <aron.ahmadia at kaust.edu.sa>
>
>> Can you re-run both codes with: -log_summary please?
>>
>> A
>>
>> On Wed, Aug 22, 2012 at 10:43 AM, Feng Li <fengshen186 at gmail.com> wrote:
>> > The performance of petsc_3.3p2 is five times faster than
>> petsc_dev-r24197.
>> > Why?
>> >
>> > It is tested with pflotran example problem 100x100x100.
>> > config parameter：--with-mpi=0 --CC=gcc --FC=gfortran --CCFLAGS="-g -O2"
>> > --FCFLAGS="-g -O2" --blas-lapack-dir=$MKLROOT
>> >
>> > detail time:
>> >                       petsc_3.3p2          petsc_dev24197
>> > walltime(sec)        28.116                 110.25
>> >
>> > Thank you!
>>
>> --
>>
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>


-- 
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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