<div dir="ltr">Yes, in addition, we've built what we call a Master/Slave controller system in Kepler that creates a distributed execution system that allows a master workflow to spawn subworkflows on slave nodes that are running a Kepler instance behind an RMI-based controller. This system has a GUI in Kepler for users to choose which nodes to use based on the ones listed in a node registry, and a DistributedComposite actor that workflow designers use to indicate which parts of a workflow should be executed remotely. There is a functioning prototype of this system in the Kepler trunk, and continuing work to refine it for shipment withthe next version of Kepler. The Kepler Distributed Execution Interest Group is pursuiing this functionality.<br>
<br><a href="https://dev.kepler-project.org/developers/interest-groups/distributed">https://dev.kepler-project.org/developers/interest-groups/distributed</a><br><br>Matt<br><br><div class="gmail_quote">On Thu, Oct 2, 2008 at 2:15 AM, Edward A. Lee <span dir="ltr"><<a href="mailto:eal@eecs.berkeley.edu">eal@eecs.berkeley.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
We have done some experimenting with having multiple workflows running<br>
and communicating in the (underlying) Ptolemy II system. Yang Zhao made<br>
some Ptolemy II models a few years ago that implemented a distributed<br>
chat application as a concept demo. But we've never really packaged<br>
up this work... It would be well worth doing...<br>
<br>
Edward<br>
<br>
<br>
Bertram Ludaescher wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div><div></div><div class="Wj3C7c">
<br>
<br>
On Thu, Oct 2, 2008 at 1:27 AM, ted leslie <<a href="mailto:tleslie@tcn.net" target="_blank">tleslie@tcn.net</a> <mailto:<a href="mailto:tleslie@tcn.net" target="_blank">tleslie@tcn.net</a>>> wrote:<br>
<br>
<br>
I just stumpled upon Kepler and am absolutly blown away!<br>
<br>
I think it will be very useful for me,<br>
but one requirement that I would have is,<br>
<br>
Can I have workflows interact?<br>
Can one trigger another, or start it up?<br>
Can they communicate to one another?<br>
(maybe even a WF run within a WF?, import a WF as a data provider to<br>
another WF?)<br>
<br>
<br>
There are several answers to this: First, a workflow running within a workflow is called a "composite actor" or "subworkflow" in our terminology. When one nests a wf inside another one, the question arises: how should this be executed? What's the model of computation. Thanks to Ptolemy's various underlying models of computation, we can use in Kepler different ways of nesting workflows inside one another, all with clear semantics (there are papers and documentation describing how this works).<br>
<br>
Having said this, we normally don't think of multiple instances of workflows as running indepdently and then somehow communicating. Although such a thing is possible (e.g. this *might* be related somewhat to Ptolemy's life cycle models, where one model (aka workflow in Kepler lingo) can start another one), we rather think of workflows typically as data-driven analysis pipelines (dataflow process networks). <br>
<br>
Also, I use Linux exclusively, but to avoid Java installs and other<br>
prereq.<br>
I just put it into a Windows OS on vmware, to give it a quick look.<br>
Is the Linux version as full featured as the Windows? (or fuller, or<br>
lessor?)<br>
(If not what are diffs?)<br>
<br>
<br>
I'm not aware of a difference. And you can always get the latest version via the source code repository.<br>
<br>
<br>
These might be very noob questions, and I don't mind "RTFM",<br>
but these are fundimental Q's I would appreacate brief feed back on,<br>
(or reference pointers)<br>
before I take a much deeper dive in.<br>
<br>
<br>
Here is a good starting point:<br>
<a href="http://www.kepler-project.org/Wiki.jsp?page=Documentation" target="_blank">http://www.kepler-project.org/Wiki.jsp?page=Documentation</a><br>
<br>
Bertram<br>
<br>
<br>
Thanks,<br>
<br>
<br>
--<br></div></div>
ted leslie <<a href="mailto:tleslie@tcn.net" target="_blank">tleslie@tcn.net</a> <mailto:<a href="mailto:tleslie@tcn.net" target="_blank">tleslie@tcn.net</a>>><br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br>Matthew B. Jones<br>Director of Informatics Research and Development<br>National Center for Ecological Analysis and Synthesis (NCEAS)<br>
UC Santa Barbara<br><a href="mailto:jones@nceas.ucsb.edu">jones@nceas.ucsb.edu</a> Ph: 1-907-523-1960<br><a href="http://www.nceas.ucsb.edu/ecoinfo">http://www.nceas.ucsb.edu/ecoinfo</a><br>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br>
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