dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Mon, Jun 01, 2009 at 04:06:40PM +0200, DOLFIN wrote:
> One or more new changesets pushed to the primary dolfin repository.
> A short summary of the last three changesets is included below.
> 
> changeset:   6245:30c1540b12097130e3ed48ed572819471c884a7b
> tag:         tip
> user:        "Garth N. Wells <gnw20@xxxxxxxxx>"
> date:        Mon Jun 01 15:06:26 2009 +0100
> files:       dolfin/la/EpetraSparsityPattern.cpp dolfin/la/EpetraSparsityPattern.h dolfin/la/GenericSparsityPattern.h dolfin/la/SparsityPattern.cpp dolfin/la/SparsityPattern.h dolfin/la/uBLASMatrix.h
> description:
> Use std::set in SparsityPattern.
> 
> Some performance issues seem to have been resolved with std::set.
> 
> std::tr1::unsorted_set is faster, but requires some effort to sort. Sorting is only relevant to the uBLAS backend at this point.

Building the sparsity pattern seems to be slightly faster, but
deleting it takes significantly longer. The relative slowdown for that
step is a factor 15-20.

I was wondering why we used std::vector instead of std::set, but this
might be the reason: It takes a *long* time to delete std::set. We
should look for something else.

-- 
Anders

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