Hi Ben and Roy
In libMesh 0.5.0, The assemble function runs very quickly. But in
libMesh0.6.2, It is very slowly. The memory used in libMesh0.5.0 is much
larger than in libMesh0.6.2 before call assemble function. The program is
the same. Why?
I debugged my programe. The function of apply_periodic_b
> You must be adding the constraint rows after the matrix has been
> preallocated... Regardless of whether PeriodicBoundary calls would
> fix your problem, we ought to make sure that users are able and
> encouraged to do efficient preallocation for arbitrary user
> constraints, too.
The DOF conne
2008/3/19, Roy Stogner <[EMAIL PROTECTED]>:
>
>
> On Wed, 19 Mar 2008, Shengli Xu wrote:
>
>
> > In the system, there are peroidic boundary conditions applied through "
> > dof_map.constrain_element_matrix_and_vector(Ke,Fe,dof_indices);" before
> > system.matrix->add_matrix(Ke,dof_indices);
> > sys
On Wed, 19 Mar 2008, Shengli Xu wrote:
> In the system, there are peroidic boundary conditions applied through "
> dof_map.constrain_element_matrix_and_vector(Ke,Fe,dof_indices);" before
> system.matrix->add_matrix(Ke,dof_indices);
> system.rhs->add_vector(Fe,dof_indices);
> during elements asse
Hi Ben and Roy,
The version of libMesh is 0.6.2. I modified src/mesh/unstructured_mesh.C,
add "(name.rfind(".unv") < name.size())" on line 385 to skip renumber nodes
and elements for .unv input file.
I use PETSc2.3.3. Running the code with -info, I find that Number of mallocs
during MatSetValues()
On Wed, 19 Mar 2008, Shengli Xu wrote:
> micro_fluid_loadcase11_assemble is the performance log of calling the
> function of assembling stiffness matrix.
> | micro_fluid_loadcase11_assemble1 5515.6511 5515.651089
You might want to do some more fine-grained performance logging.
> 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 ass
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
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. Bu
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 th
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