At 10:50 AM 7/25/2008, Paul Allen wrote: >I found this answer helpful. I have one follow-up question: You said that you >use MoMLParser.parse(String) to open multiple instances. Does using teh >MoMLParser.parse(URL) version of that method NOT open multiple instances?
No... In almost any application, if you open a file that you already have open, you just see the same instance of the file. In a text editor, for example, you don't get a new window with a new copy of the file. Same for a word processor or an IDE. If you did get a new window, then things would get very confusing. You could make a change in one copy, save it, then make a change in the other copy, save it. The first change will have been obliterated. Thus, it is generally a bug in a tool opens multiple copies of the same file as separate instances. Edward >Brian Hudson wrote: >>Do I remember correctly that Ptolemy does not in any way support >>Java concurrency or multi-threading? >> >> >>This depends on your domain really. PN for example uses quite a bit of >>threading. >> >>If so, then I would assume that one couldn't safely run 2 models in one JVM, >>even if each had its own instances of TypedCompositeActor, Manager, Director, >>etc. If one wanted concurrency, one would run separate JVM's, each with one >>model that would have no contact with any other model. Right? >> >> >>You can safely run multiple models in one JVM. You just need to make sure >>that you have two instances of the model in memory. We do this by using the >>MoMLParser.parser(String) to open multiple instances of the same model. >> >>If (in one JVM) I had a program running that wanted to run several models >>(similar to each other), one after the other, how much reuse of Ptolemy >>instances makes sense? Would you recommend nulling all references after each >>model run, and instantiating all Ptolemy objects fresh? Or would it make any >>sense to reuse the same TypedCompositeActor, Manager, Director, etc? >> >> >>We do this as well. We have some code that "injects" some actors into a model >>before me run it, and we modify several parameters. When the execution has >>completed we remove these "injected" actors and reset the parameters. When >>running sequential runs on the same model we reuse everything. >> >>Does Ptolemy have a way to scrub all actors out of a model, allowing the >>creation of new ones? >> >> >>We create all of our "injected" actors in their own composite at the top >>level. That we when we want to delete them we can simply delete that one >>CompositeEntity. >> >>Brian >> >>On Fri, Jul 25, 2008 at 12:27 PM, Richard Ware <<mailto:[EMAIL >>PROTECTED]>[EMAIL PROTECTED]> wrote: >>1) Do I remember correctly that Ptolemy does not in any way support >>Java concurrency or multi-threading? If so, then I would assume that one >>couldn't safely run 2 models in one JVM, even if each had its own >>instances of TypedCompositeActor, Manager, Director, etc. If one >>wanted concurrency, one would run separate JVM's, each with one >>model that would have no contact with any other model. Right? >> >>2) If (in one JVM) I had a program running that wanted to run >>several models (similar to each other), one after the other, how much reuse >>of Ptolemy instances makes sense? Would you recommend nulling >>all references after each model run, and instantiating all Ptolemy objects >>fresh? Or would it make any sense to reuse the same >>TypedCompositeActor, Manager, Director, etc? Regardless of >>which approach I use, I plan to delete all actors from the first model run >>and create all actors for the second run fresh, for reasons involving the >>nature of my simulation. Does Ptolemy have a way to scrub all actors >>out of a model, allowing the creation of new ones? >> >> I look forward to your clarifications. >> >> Richard Ware >> >> >> >> >> >>---------------------------------------------------------------------------- >>Posted to the ptolemy-hackers mailing list. Please send administrative >>mail for this list to: <mailto:[EMAIL PROTECTED]>[EMAIL PROTECTED] >> > >------------ >Edward A. Lee >Robert S. Pepper Distinguished Professor >EECS Dept., 545Q Cory Hall, UC Berkeley, Berkeley, CA 94720-1770 >phone: 510-643-3728, fax: 510-642-5745 >[EMAIL PROTECTED], http://www.eecs.berkeley.edu/Faculty/Homepages/lee.html ---------------------------------------------------------------------------- Posted to the ptolemy-hackers mailing list. Please send administrative mail for this list to: [EMAIL PROTECTED]