dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Sat, Aug 29, 2009 at 12:31:24AM +0200, Johan Hake wrote:
> On Friday 28 August 2009 22:35:08 Anders Logg wrote:
> > On Wed, Aug 19, 2009 at 01:41:50PM +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:   6801:d3897056b4c92df1a2decddb8481f01011468683
> > > tag:         tip
> > > user:        "Johan Hake <hake@xxxxxxxxx>"
> > > date:        Wed Aug 19 13:41:45 2009 +0200
> > > files:       site-packages/dolfin/compile_extension_module.py
> > > site-packages/dolfin/jit.py description:
> > > Add a "mpi_jit_decorator" function which generalizes the paralell jit
> > > compilation algorithm.
> > >
> > >    It utilize a nice feature in Python: decorators
> > >    To apply it to a jit_compiler just import the decorator and decorate
> > >    your jit function:
> > >
> > >    @mpi_jit_decorator
> > >    def some_jit_compiler(some):
> > >       ....
> >
> > Pretty cool, but why the threads? I don't understand why that should
> > be needed.
>
> If we want a message that tells the user that a form will be jit compiled on
> the first process, only when it actually is compiling, I couldn't find another
> non-intrusive way to implement it.
>
> The same process that starts the compiling needs to find out if an actual
> compilation has started. This is done using a thread. It starts it, wait a
> while 0.2 s I think, using the join function), check if the thread is alive.
> If the thread is alive, assume it is compiling and issue a message. If the
> thread is not alive we assume the module is picked up from cache, and we
> proceed without issuing a message. Also note that if the cache is used, the
> present thread will finish the join statement before the 0.2 s.

Maybe it's enough that we get a message from the actual JIT function
that it is compiling? That message will only appear (at least from
FFC) when code is not cached.

--
Anders



> Johan
>
> >
> > > changeset:   6800:2dc2719112892bcc48fa70c4622872a0cc251243
> > > user:        Johannes Ring <johannr@xxxxxxxxx>
> > > date:        Wed Aug 19 13:31:10 2009 +0200
> > > files:       test/memory/test.py
> > > description:
> > > Remove reaction demo when running Valgrind (buildbot times out).
> > >
> > >
> > > changeset:   6799:60d081f9053d3db8215f9150914b1d79af03b83b
> > > user:        "Johan Hake <hake@xxxxxxxxx>"
> > > date:        Wed Aug 19 13:11:37 2009 +0200
> > > files:       dolfin/main/MPI.cpp
> > > description:
> > > Fixed unimplemented dolfin::MPI::barrier()
> > >
> > > ----------------------------------------------------------------------
> > > For more details, visit http://www.fenics.org/hg/dolfin
> > > _______________________________________________
> > > DOLFIN-dev mailing list
> > > DOLFIN-dev@xxxxxxxxxx
> > > http://www.fenics.org/mailman/listinfo/dolfin-dev

Attachment: signature.asc
Description: Digital signature