dolfin team mailing list archive

[Nuno David Lopes <ndl@xxxxxxxxxxxxxx>]

On Thursday 25 September 2008, Matthew Knepley wrote:
> This is definitely wrong. Dave and I have been doing this all week here
> and those times are way way off.
Sorry the time i show is the total time from the beggining of the process.
I get the following times:

----------------------------------------------------------------------
Solving linear system of size 566769 x 566769 (Krylov solver).
PETSc Krylov solver (gmres, sor) converged in 35 iterations.
Summary of timings  |  Average time  Total time  Reps
-----------------------------------------------------
ASSEMB_BC            |         24.42       24.42     1
Assemble cells         |          5.33       10.66     2
Build sparsity           |         6.305       12.61     2
Delete sparsity         |         0.125        0.25     2
GMRES_SOR            |         35.86       35.86     1
Init dof map             |          0.66        2.64     4
Init tensor                |          0.16        0.32     2
End Process after 69.400000 seconds.
--------------------------------------------------------------------

-----------------------------------------------------------------------
Solving linear system of size 566769 x 566769 (Krylov solver).
PETSc Krylov solver (gmres, ml) converged in 9 iterations.

Summary of timings  |  Average time  Total time  Reps
-----------------------------------------------------
ASSEM_BC              |         24.38       24.38     1
Assemble cells         |          5.33       10.66     2
Build sparsity           |           6.3        12.6     2
Delete sparsity         |         0.125        0.25     2
GMRES_ML              |         79.92       79.92     1
Init dof map            |          0.66        2.64     4
Init tensor               |         0.165        0.33     2
End Process after 113.450000 seconds.


> This looks to me like ML on the entire Stokes system. 
No, i'm just testing in the the following simple system:
---------------------------------------------------
Ax=b where A is given by (grad(u),grad(v))
with u and v in VectorElement("Lagrange", "tetrahedron", 2)
--------------------------------------------------

Are this timings completly wrong? 


> > --
> > Nuno David Lopes
> >
> > e-mail:ndl@xxxxxxxxxxxxxx        (FCUL/CMAF)
> >           nlopes@xxxxxxxxxxxxxxx    (ISEL)
> > http://ptmat.ptmat.fc.ul.pt/%7Endl/
> >
> > Thu Sep 25 12:30:54 WEST 2008
> > _______________________________________________
> > DOLFIN-dev mailing list
> > DOLFIN-dev@xxxxxxxxxx
> > http://www.fenics.org/mailman/listinfo/dolfin-dev



-- 
Nuno David Lopes

e-mail:ndl@xxxxxxxxxxxxxx        (FCUL/CMAF)
           nlopes@xxxxxxxxxxxxxxx    (ISEL)
http://ptmat.ptmat.fc.ul.pt/%7Endl/ 

Thu Sep 25 15:00:57 WEST 2008