Hi, folks. I'm trying to create a model in the DE domain with
thousands of actors.
I'm creating the model, and running it, by writing Java code; I'm not
doing anything
graphical at all. All the actors are instances of the same Java class
that extends
DEActor. Each actor has one input and one output, each with about four
channels
connecting to other actors (except for a few actors at the "beginning
edge" and
"ending edge" of the graph, which have no input channels and no output
channels,
respectively).
What confuses me and alarms me is that, while the code (step 1) to
instantiate the
actors and the code (step 3) to run the model executes in a reasonable
amount of
time, the code (step 2) to wire together all the actors' inputs and
outputs takes an
amazing amount of time! I'm trying my program with a steadily larger
and larger
number of actors, and doubling the number of actors causes the time for
Step 2
to multiply 8 times! For example, with 1,000 actors, it took 186
milliseconds to
instantiate them, 9 minutes and 35 seconds to wire them, and 2 minutes
to run
the simulation.
I've stepped through my own code, and the Ptolemy code, trying to find
which code might be taking a long time during link-wiring, and
I've gotten some glimpses. For one thing, every
time you add one new link to a model, Ptolemy does a lot of rechecking of
the graph topology and model integrity--that makes me wish there were a
version of method CompositeEntity.connect( ComponentPort, ComponentPort )
that would take a bunch of links, add them all in, <I>then</i> check model
integrity. Also, it looks to me like some of the checking may be
related to checking
the model's safety for modification while it's running. I don't want to
modify it
while it's running; is there a way for me to configure something to
signify that,
so that Ptolemy won't check the model so thoroughly?
About the only other glimpse I've gotten is that method
DEDirector._computePortDepth() seems to take up a lot of time.
Of course I will appreciate any information or advice you can give me
and how to make linking take less time.
Respectfully,
Richard Ware
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