Is there an easy way to change these options? From MATSOLVERPASTIX, it seems that no command line options to control this. http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MATSOLVERPASTIX.html
Do I have to modify PaStiX.py and recompile? If yes, would you like to give me some hints on where to modify? Thanks. Xiangdong On Sun, Dec 11, 2011 at 12:49 PM, Barry Smith <bsmith at mcs.anl.gov> wrote: > > ?Looks like Pastix is running with different options hence different > performance. > > ? Barry > > On Dec 11, 2011, at 10:08 AM, Xiangdong Liang wrote: > >> On Sun, Dec 11, 2011 at 9:04 AM, Matthew Knepley <knepley at gmail.com> >> wrote: >>> On Sun, Dec 11, 2011 at 12:05 AM, Xiangdong Liang <xdliang at gmail.com> >>> wrote: >>>> >>>> Hello PETSc team, >>>> >>>> I was using PaStiX within petsc 3.1-p8. Today, I am trying PaStiX >>>> within petsc-dev. However, For the same code, solving the same linear >>>> system takes longer time (120s vs 90s) in petsc-dev. Both are compiled >>>> with debugging mode off. Is it possible that the newer PaStiX is >>>> slower than old version? or due to some options in compiling? >>> >>> >>> It is likely the options are not exactly the same, meaning the ordering is >>> different, >>> etc. Did you check everything wiht -ksp_view and -ksp_monitor? >> >> I ?use ksp_view, ksp_monitor options and same -pc_factor_zeropivot >> 1e-12, the dev version is still slower. One difference I see from >> pastix_verbose is the option of Pastix: >> >> In pets-3.1: I have >> >> ? ? ?DISTRIBUTED ? ? ? ? : ? ? ? ? ? ? ? ? ?Not defined >> ? ? ? FLUIDBOX ? ? ? ? ? ?: ? ? ? ? ? ? ? ? ?Not defined >> ? ? ? METIS ? ? ? ? ? ? ? : ? ? ? ? ? ? ? ? ?Not defined >> >> >> While in petsc-dev, I have >> >> ? ? ?DISTRIBUTED ? ? ? ? : ? ? ? ? ? ? ? ? ? Defined >> ? ? ? ?METIS ? ? ? ? ? ? ? : ? ? ? ? ? ? ? ? ? Not defined >> ? ? ? ?WITH_SCOTCH ? ? ? ? : ? ? ? ? ? ? ? ? ? Defined >> >> >> However, I do not understand these options. Could that be the reason? >> >> Xiangdong >> >>> >>> ? ?Matt >>> >>>> >>>> Best, >>>> Xiangdong >>>> >>>> PS. I cannot use PaStiX in 3.2 because in the runtime, PaStiX crashed >>>> due to missing of the option -DWITHSCOTCH during compiling. It was >>>> reported before by one user and fixed in petsc-dev, but not in >>>> petsc-3.2-p5. >>>> >>>> http://lists.mcs.anl.gov/pipermail/petsc-users/2011-March/008356.html >>> >>> >>> >>> >>> -- >>> 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 >
