[FRIAM] A cautionary tale

[Douglas Roberts]

I'm always looking for areas where I can agree with others, while sometimes
simultaneously disagreeing with other bits of what is being said.  I agree
with this bit:

On 10/8/06, Marcus G. Daniels <mgd at santafe.edu> wrote:
>
>
> >  No ABM system should [...] expose MPI to model code, [...]


 To this end, the TRANSIMS and EpiSIMS developers produced an
object-oriented API to MPI that hid the ugliness of the nuts and bolts of
the MPI toolkit from the ABM developers.  We've been using it for about 10
years now.  Objects that needed to travel between cpus inherited the
necessary functionality from an MPI-aware C++ class.  We also developed the
practice of hiding the internals of some the functional object
representations of agents in the models.  Serialization, for example, which
is necessary when packing an object into a message for sending to another
cpu was hidden behind inherited C++ methods and specializations.

--Doug

-- 
Doug Roberts, RTI International
droberts at rti.org
doug at parrot-farm.net
505-455-7333 - Office
505-670-8195 - Cell
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