Hi John
The program runns in opt mode. The information of system is as follows:
Mesh Information:
mesh_dimension()=3
spatial_dimension()=3
n_nodes()=1331
n_elem()=1000
n_local_elem()=1000
n_active_elem()=1000
n_subdomains()=1
n_processors()=1
processor_id()=0
EquationSystems
n_systems()=1
System "Stokes_Darcy"
Type "LinearImplicit"
Variables="u" "v" "w" "p"
Finite Element Types="LAGRANGE" "LAGRANGE" "LAGRANGE" "LAGRANGE"
Approximation Orders="SECOND" "SECOND" "SECOND" "FIRST"
n_dofs()=16214
n_local_dofs()=16214
n_constrained_dofs()=2883
n_vectors()=12
micro_fluid_loadcase11_assemble is the performance log of calling the
function of assembling stiffness matrix.
-----------------------------------------------------------------------------------
| Main Program Performance: Alive time=5665.91, Active time=5515.65
|
-----------------------------------------------------------------------------------
| Event nCalls Total Avg
Percent of |
| Time Time
Active Time |
|-----------------------------------------------------------------------------------|
|
|
| micro_fluid_loadcase11_assemble 1 5515.6511 5515.651089
100.00 |
-----------------------------------------------------------------------------------
| Totals: 1 5515.6511
100.00 |
-----------------------------------------------------------------------------------
Cheers
Shengli
2008/3/18, John Peterson <[EMAIL PROTECTED]>:
>
> It should not take 2 hours to assemble a system with 15,000 dofs.
> Something is seriously wrong, perhaps you are in debug mode?
>
> -J
>
>
> On Tue, Mar 18, 2008 at 9:02 PM, Shengli Xu <[EMAIL PROTECTED]>
> wrote:
> > Hi, Libmesh Users
> > I find the stiffness matrix assembling is very slow at the first time.
> But
> > it is very quickly at the second time and laters for the same system.
> > It needs 2 hours to assemble the stiffness matrix of the 3d stokes
> system
> > with 15,000 dofs. How to speed up the process of assembling the system
> > stiffness matrix at the first time?
> > I find the similar question in the maillist. The title is "assembling a
> > PetscMatrix".
> >
> > Sincerely
> > Shengli
> >
> >
> > --
> > Best regards,
> >
> > Yours sincerely
> > ShengliXu
> > Department of Engineering Mechanics
> > State Key Laboratory of Structural Analysis for Industrial Equipment
> > Dalian University of Technology
> > Dalian, 116023, P. R. China
> > Email: [EMAIL PROTECTED]
> > ==========================
>
>
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--
Best regards,
Yours sincerely
ShengliXu
Department of Engineering Mechanics
State Key Laboratory of Structural Analysis for Industrial Equipment
Dalian University of Technology
Dalian, 116023, P. R. China
Email: [EMAIL PROTECTED]
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