Impossible, please check the spelling, and make sure your command line was not truncated.
Matt On 2/9/07, Ben Tay <zonexo at gmail.com> wrote: > > ya, i did use -log_summary. but no output..... > > On 2/9/07, Barry Smith <bsmith at mcs.anl.gov> wrote: > > > > > > -log_summary > > > > > > On Fri, 9 Feb 2007, Ben Tay wrote: > > > > > Hi, > > > > > > I've tried to use log_summary but nothing came out? Did I miss out > > > something? It worked when I used -info... > > > > > > > > > On 2/9/07, Lisandro Dalcin <dalcinl at gmail.com> wrote: > > > > > > > > On 2/8/07, Ben Tay < zonexo at gmail.com> wrote: > > > > > i'm trying to solve my cfd code using PETSc in parallel. Besides > > the > > > > linear > > > > > eqns for PETSc, other parts of the code has also been parallelized > > using > > > > > MPI. > > > > > > > > Finite elements or finite differences, or what? > > > > > > > > > however i find that the parallel version of the code running on 4 > > > > processors > > > > > is even slower than the sequential version. > > > > > > > > Can you monitor the convergence and iteration count of momentum and > > > > poisson steps? > > > > > > > > > > > > > in order to find out why, i've used the -info option to print out > > the > > > > > details. there are 2 linear equations being solved - momentum and > > > > poisson. > > > > > the momentum one is twice the size of the poisson. it is shown > > below: > > > > > > > > Can you use -log_summary command line option and send the output > > attached? > > > > > > > > > i saw some statements stating "seq". am i running in sequential or > > > > parallel > > > > > mode? have i preallocated too much space? > > > > > > > > It seems you are running in parallel. The "Seq" are related to > > local, > > > > internal objects. In PETSc, parallel matrices have inner sequential > > > > matrices. > > > > > > > > > lastly, if Ax=b, A_sta and A_end from MatGetOwnershipRange and > > b_sta > > > > and > > > > > b_end from VecGetOwnershipRange should always be the same value, > > right? > > > > > > > > I should. If not, you are likely going to get an runtime error. > > > > > > > > Regards, > > > > > > > > -- > > > > Lisandro Dalc?n > > > > --------------- > > > > Centro Internacional de M?todos Computacionales en Ingenier?a > > (CIMEC) > > > > Instituto de Desarrollo Tecnol?gico para la Industria Qu?mica > > (INTEC) > > > > Consejo Nacional de Investigaciones Cient?ficas y T?cnicas (CONICET) > > > > PTLC - G?emes 3450, (3000) Santa Fe, Argentina > > > > Tel/Fax: +54-(0)342-451.1594 > > > > > > > > > > > > > > -- One trouble is that despite this system, anyone who reads journals widely and critically is forced to realize that there are scarcely any bars to eventual publication. There seems to be no study too fragmented, no hypothesis too trivial, no literature citation too biased or too egotistical, no design too warped, no methodology too bungled, no presentation of results too inaccurate, too obscure, and too contradictory, no analysis too self-serving, no argument too circular, no conclusions too trifling or too unjustified, and no grammar and syntax too offensive for a paper to end up in print. -- Drummond Rennie -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20070209/0a5aaa01/attachment.htm>
