dolfin team mailing list archive

[Johan Hake <hake@xxxxxxxxx>]

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.


Johan

> --
> Anders
>
> > 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
> > _______________________________________________
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