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http:^^www.cs.cornell.edu^info^people^hayden^ensemble^ensemble.html

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Date: Sunday, 01-Dec-96 18:41:39 GMT
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<html><head><title> Ensemble </title></head><BODY BACKGROUND=per.gif TEXT=#000000> <center><h1> THE ENSEMBLE DISTRIBUTED COMMUNICATION SYSTEM </h1></center><body><p>Ensemble is the next generation of the <!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><AHREF="http://www.cs.cornell.edu/Info/Projects/HORUS/Overview.html">Horus</A> groupcommunication toolkit, also developed at <!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><A HREF="http://www.cs.cornell.edu"> CornellUniversity.</A> Visit the Horus page for more information about Horus, papers ongroup communication, and pointers to other sites with related information.<p><h3>Language support</h3> Note that the current distribution primarily providessupport for applications developed in the ML programming language.  However,interfaces to several other languages are under developlment and will be madeavailable soon.  (You can check out our <!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><A HREF="http://www.cs.cornell.edu/Info/People/hayden/ensemble/roadmap.html">roadmap</A> for futuredevelopment to see what our plans are.)<ul><li>ML: Ensemble is implemented in the <!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><AHREF="http://pauillac.inria.fr:80/ocaml">Objective Caml</A> programming language (adialect of ML).  The use of ML supports a variety of optimizations that enableEnsemble to achieve communication latencies an order of magnitude faster than Horus(although the current distribution does not enable these optimizations).<li>C: Ensemble supports an interface to C, a prototype appears in the currentdistribution.  This interface is being expanded upon to provide complete support forC applications.<li>C++: Also under development are two C++ interfaces: the <!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><AHREF="http://www.cs.cornell.edu/Info/Projects/HORUS/HOT/hot.html"> Horus ObjectTools</A> (HOT) interface, and <!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><A HREF="http://www.olsen.ch/~maffeis/electra.html">Electra </A> (a Corba object request broker interface).<li>Java: Finally, work is being to interface Ensemble to Java and to wrap Ensembleas a Netscape plug-in.</ul><h3>Building applications with Ensemble</h3> For an application builder, Ensembleprovides a library of protocols that can be used for quickly building complexdistributed applications.  An application registers 10 or so event handlers withEnsemble, and then the Ensemble protocols handle the details of reliably sending andreceiving messages, transferring state, implementing security, detecting failures,and managing reconfigurations in the system.<h3>A research tool</h3> For a distributed systems researcher, Ensemble is a highlymodular and reconfigurable toolkit.  The high-level protocols provided toapplications are really stacks of tiny protocol "layers."  These protocol layers eachimplement several simple properties: they are composed to provide sets of high-levelproperties, such as total ordering, security, virtual synchrony, etc....  Individuallayers can be modified or rebuilt to experiment with new properties or change theperformance characteristics of the system.  This makes Ensemble a very flexibleplatform on which to do research.<p><h3>Other Information</h3><ul><li><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><A HREF="http://www.cs.cornell.edu/Info/People/hayden/ensemble/faq.html">General</A> information about Ensemble.<li>Find out more about <!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><AHREF="http://www.cs.cornell.edu/Info/Projects/HORUS/Overview.html">Horus</A><li>Our <!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><A HREF="http://www.cs.cornell.edu/Info/People/hayden/ensemble/roadmap.html">roadmap</A> for future development of Ensemble.<li>Transfer the <!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><A HREF="http://www.cs.cornell.edu/Info/People/hayden/ensemble/submit.html">distribution</A> (after reading the licenseagreement).<li>Peruse the <!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><A HREF="http://www.cs.cornell.edu/Info/People/hayden/ensemble/tut.ps">tutorial</A>.<li>Stay in touch with us through the Horus+Ensemble <!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><A HREF="http://www.cs.cornell.edu/Info/Projects/HORUS/general/maillist.html">mailing list</A>.</ul><p><address><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><A HREF="mailto:hayden@cs.cornell.edu">Mark Hayden</A></address></body></html>

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