On 10/4/07, Dr. Timothy Stitt <timothy.stitt at ichec.ie> wrote: > Matthew, > > Out of curiosity what would you term as very very large? The matrices I > am using will probably be of order 10^3 x 10^3 elements.
I believe this is fairly small. SuperLU and MUMPS routinely report results for matrices of order 10^5x10^5 (on large parallel systems). Matt > Thanks, > > Tim. > > Matthew Knepley wrote: > > On 10/4/07, Dr. Timothy Stitt <timothy.stitt at ichec.ie> wrote: > > > >> Dear PETSc Community, > >> > >> I was wondering if anyone knew of any sparse/dense banded linear solvers > >> that run in order (N)? Does PETSc provide such a solver or link to an > >> appropriate external solver? There seems to be a lot of links online to > >> theoretical approaches but we are having difficulties in sourcing an > >> implementation? I am hoping PETSc might be our saviour ??? > >> > > > > Have you tried MUMPS or SuperLU, both available through PETSc's configure? > > They are not truly O(N), but its hard to tell the difference until you get > > very > > very large, or have a nice elliptic PDE on a regular grid. In the > > latter case, you > > should use the PETSc DMMG. > > > > Matt > > > > > >> Thanks in advance, > >> > >> Tim. > >> > >> -- > >> Dr. Timothy Stitt <timothy_dot_stitt_at_ichec.ie> > >> HPC Application Consultant - ICHEC (www.ichec.ie) > >> > >> Dublin Institute for Advanced Studies > >> 5 Merrion Square - Dublin 2 - Ireland > >> > >> +353-1-6621333 (tel) / +353-1-6621477 (fax) / +353-874195427 (mobile) > >> > >> > >> > > > > > > > > > -- > Dr. Timothy Stitt <timothy_dot_stitt_at_ichec.ie> > HPC Application Consultant - ICHEC (www.ichec.ie) > > Dublin Institute for Advanced Studies > 5 Merrion Square - Dublin 2 - Ireland > > +353-1-6621333 (tel) / +353-1-6621477 (fax) / +353-874195427 (mobile) > > -- 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
