[petsc-users] -log_view hangs unexpectedly // how to optimize my kspsolve

[Jed Brown]

Manuel Valera <mvalera at mail.sdsu.edu> writes:

> I was able to find the bug, it was the outer loop bound in the same fashion
> than before, my -log_view is this :
[...]
>       ##########################################################
>       #                                                        #
>       #                          WARNING!!!                    #
>       #                                                        #
>       #   This code was compiled with a debugging option,      #
>       #   To get timing results run ./configure                #
>       #   using --with-debugging=no, the performance will      #
>       #   be generally two or three times faster.              #
>       #                                                        #
>       ##########################################################

The above isn't a joke.

> VecMDot              525 1.0 1.7089e+00 1.7 1.48e+09 1.0 0.0e+00 0.0e+00
> 1.0e+03  7 17  0  0  6   7 17  0  0  6  1735
>
> VecMAXPY            1050 1.0 2.3646e+00 1.1 2.97e+09 1.0 0.0e+00 0.0e+00
> 0.0e+00 11 34  0  0  0  11 34  0  0  0  2508

You are spending about a third of the solve time doing vector work.
What is your reason for using GCR?

> KSPSolve               5 1.0 1.2218e+01 1.0 8.66e+09 1.0 1.1e+03 2.0e+04
> 1.9e+04 59100 99 43 99  59100 99 43 99  1418
>
> PCSetUp                3 1.0 1.7993e+00 1.0 1.27e+07 1.0 0.0e+00 0.0e+00
> 1.0e+01  8  0  0  0  0   8  0  0  0  0    14
>
> PCSetUpOnBlocks        5 1.0 1.9013e-01 1.7 1.27e+07 1.0 0.0e+00 0.0e+00
> 0.0e+00  1  0  0  0  0   1  0  0  0  0   134
>
> PCApply              546 1.0 3.8320e+00 1.1 1.77e+09 1.0 0.0e+00 0.0e+00
> 1.0e+00 18 20  0  0  0  18 20  0  0  0   925

To make a big improvement, you'll need a better preconditioner.  What
kind of problem is this?
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