-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 > > > > >
