camm at enhanced.com
Wed Sep 13 07:59:45 PDT 2000
Greetings! the scalapack testers have statically allocated arrays.
TOTMEM is a paramater, and set to a small value by default, if memory
serves. Just edit and recompile. The Debian scalapack-test package
has this pre-adjusted to something more reasonable.
Fredrik Augustsson <hamlet at cs.umu.se> writes:
> I've tried to run the xdlutime to get an estimate for how well our
> cluster performs, but I can only test small matrices. I have 8 dual PIII
> with 512 MB of memory so would at least be abel to run tests on
> 20000x20000, or am I wrong here?
> Output ...
> dumburk [~/pfs]$ mpirun -np 8 -npn 1 xdlutime
> Simple Timer for ScaLAPACK routine PDGESV
> Number of processors used: 8
> TIME N NB P Q LU Time Sol Time MFLOP/S Residual CHECK
> ---- ----- --- --- --- --------- --------- -------- -------- -------
> Unable to perform LU-solve: need TOTMEM of at least 325494408
> Bad MEMORY parameters: going to next test case.
> + Fredrik
> On Tue, Sep 12, 2000 at 10:56:38PM -0400, Patrick GEOFFRAY wrote:
> > Putchong Uthayopas wrote:
> > > Below are our results. The machines is 8 Athlon 550MHz and one 1Ghz Athlon.
> > > 512 Mb memory each. and Myrinet.
> > > WALL 6000 9 1 9 116.80 0.41 1229.04 0.001097 PASSED
> > >
> > > WALL 6000 9 9 1 200.79 3.65 704.66 0.001926 PASSED
> > Hi,
> > it seems that you are far from what you can get from your cluster
> > !
> > * First, 9 nodes is not a good idea, the (1*9) or (9*1) grids are
> > bad. you should use only 8 nodes and try (2*4) and (4*2) grids,
> > much better.
> > * Then 6000 is not a big matrix. If you have 512 MB per node, you
> > should go up to 20000. It will run longuer but you will be closest
> > to the peak.
> > * Which Blas do you use ? Atlas gives a DGEMM peak at 600 MFlops
> > per Athlon, so you can hope about 4 GFlops on your cluster.
> > * Which MPI do you use ? if it's MPICH-GM, do you use the
> > -gm-can-register-memory flag ?
> > I strongly advice you to use the new High Performance Linpack
> > (HPL) benchmark form Antoine Petitet
> > (http://www.netlib.org/benchmark/index.html), it's faster than the
> > old Linpack and much easier to install.
> > Hope it can help.
> > regards.
> > Patrick Geoffray
> > ---
> > Aerospatiale Matra - Sycomore
> > Universite Lyon I - RESAM
> > http://lhpca.univ-lyon1.fr
> > _______________________________________________
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Camm Maguire camm at enhanced.com
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