dolfin team mailing list archive

[Niclas Jansson <njansson@xxxxxx>]

Niclas Jansson <njansson@xxxxxxxxxx> writes:

> dolfin@xxxxxxxxxx (DOLFIN) writes:
>
>> One or more new changesets pushed to the primary dolfin repository.
>> A short summary of the last three changesets is included below.
>>
>> changeset:   6855:51f268bf79d79b0de5d3cb20a7cacb35357c81ce
>> tag:         tip
>> user:        "Garth N. Wells <gnw20@xxxxxxxxx>"
>> date:        Wed Aug 26 14:30:18 2009 +0100
>> files:       demo/pde/elasticity/cpp/main.cpp dolfin/fem/Assembler.cpp
>> description:
>> Add OpenMP code to assembler (commented out for now).
>>
>

If insertion is done in a critical section there would virtually be
no scope for speedup (for larger number of threads)

A better idea would probably be to either

1) Partition the mesh, and only have a critical section for shared
cells.

2) Assemble into a private matrix and either add them together A_1 +
... + A_n or add them together with some fancy tree reduction algorithm.

Niclas