My tests show the coupled variant is actually faster (with Trilinos). As mentioned in ticket 658, the PySparse LU solver uses a lot of memory for this problem (it always uses a lot, but it's particularly high here). It's generally quite fast, but if it needs a substantial fraction of the RAM on your machine, then virtual memory "thrashing" can ensue, which is enormously slow. There's little point in running a simulation under these conditions.
On Jan 16, 2014, at 2:21 PM, Jane Hung <jyh...@mit.edu> wrote: > I'm using PySparse > > On Jan 15, 2014, at 10:27 PM, Guyer, Jonathan E. Dr. > <jonathan.gu...@nist.gov> wrote: > > > On Jan 14, 2014, at 2:05 PM, Jane Hung <jyh...@mit.edu> wrote: > > > >> The vector formulation is still rather slow (much much slower than with > >> just one equation). Is that expected? > > > > > > I'm not sure. We'll do some tests. > > > > What solver suite are you using? PySparse or Trilinos? > > > > _______________________________________________ > > fipy mailing list > > fipy@nist.gov > > http://www.ctcms.nist.gov/fipy > > [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ] > > _______________________________________________ > fipy mailing list > fipy@nist.gov > http://www.ctcms.nist.gov/fipy > [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ] _______________________________________________ fipy mailing list fipy@nist.gov http://www.ctcms.nist.gov/fipy [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ]
