On Thu, Mar 19, 2009 at 11:24 AM, Ravi Kannan <rxk at cfdrc.com> wrote:
> Hi all, > I am having some problems in obtaining speedups for FEM problems; I > am not sure whether this is a problem related to the way I use MPI or due > to > the slow interconnection. > > So I was wondering if there are any sample benchmark FEM problems, > which are guaranteed to give good speedups. Different architectures just do not work that way. That is why it is hard. The idea of a "good" code does not even make sense. You should run with -log_summary and then compare to the model you have for your performance. Matt > > Thanks > Ravi > > -----Original Message----- > From: petsc-users-bounces at mcs.anl.gov > [mailto:petsc-users-bounces at mcs.anl.gov]On Behalf Of Toby D. Young > Sent: Thursday, March 19, 2009 8:31 AM > To: PETSc users list > Subject: possible error error message on "make tests" > > > > > Hello, > > I configure and compile successfully petsc-3.0.0-p3 with: > ./config/configure.py --with-blas-lib=libblas.so > --with-lapack-lib=liblapack.so --with-dynamic=1 --with-shared=1 > --with-mpi=0 > (linux-gnu-c-debug x86_64). I get this worrying "possible error" message > running the tests. > > Running test examples to verify correct installation > Possible error running C/C++ src/snes/examples/tutorials/ex19 with 1 > MPI process See > http://www.mcs.anl.gov/petsc/petsc-as/documentation/troubleshooting.html > ././ex19: > symbol lookup error: ././ex19: undefined symbol: petsc_tmp_flops > Possible error running Graphics examples > src/snes/examples/tutorials/ex19 1 MPI process See > http://www.mcs.anl.gov/petsc/petsc-as/documentation/troubleshooting.html > ././ex19: > symbol lookup error: ././ex19: undefined symbol: petsc_tmp_flops Error > running Fortran example src/snes/examples/tutorials/ex5f with 1 MPI > process See > http://www.mcs.anl.gov/petsc/petsc-as/documentation/troubleshooting.html > ././ex5f: > symbol lookup error: ././ex5f: undefined symbol: dmgetlocalvector_ > Completed test examples > > I have looked in the documentation and in the troubleshooting guide and > found nothing. What does this "possible error" mean? ie; can I ignore it > safely? I am not competent enough to understand why this happens. > > Thanks. > > Best, > Toby > > -- > > Toby D. Young > Adiunkt (Assistant Professor) > Philosopher-Physicist > Department of Computational Science > Institute of Fundamental Technological Research > Polish Academy of Sciences > Room 206, ul. Swietokrzyska 21 > 00-049 Warszawa, Polska > > +48 22 826 12 81 ext. 184 > http://rav.ippt.gov.pl/~tyoung <http://rav.ippt.gov.pl/%7Etyoung> > > > -- 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20090319/d5c78bea/attachment.htm>
