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 > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20070209/77850adc/attachment.htm>
