http:^^www.cs.cornell.edu^info^projects^horus^arpa^arpa.html

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<!-- File: arpa.html --><!-- Author: Ken Birman and Robbert van Renesse --><!-- Contents: ARPA WWW page --><!-- Created: January 1995 --><html><head><title>HORUS DISTRIBUTED COMPUTING ENVIRONMENT</title></head><body><h1>HORUS DISTRIBUTED COMPUTING ENVIRONMENT</h1><p><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><a href="http://www.cs.cornell.edu/Info/Projects/ISIS/people/ken.gif"><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><img src="http://www.cs.cornell.edu/Info/Projects/ISIS/people/ken_small.gif" align="middle" alt="@"></a> <!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><a href="http://www.cs.cornell.edu/Info/Faculty/Kenneth_Birman.html">Kenneth Birman</a> (ken@cs.cornell.edu)<br><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><a href="http://www.cs.cornell.edu/Info/Projects/ISIS/people/rvr.gif"><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><img src="http://www.cs.cornell.edu/Info/Projects/ISIS/people/rvr_small.gif" align="middle" alt="@"></a> <!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><a href="http://www.cs.cornell.edu/Info/People/rvr/rvr.html">Robbert van Renesse</a> (rvr@cs.cornell.edu)<br><hr><p>Cornell's<!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><a href="http://www.cs.cornell.edu/Info/People/rvr/papers/arch/arch.html">Horus </a> effort has developed a programming environment for reliabledistributed computing.  During the last year, Horus was used to demonstrategroupware and fault-tolerance over high performance networks, and was foundto offer higher performance than other similar systems.  Novel features ofHorus are its flexible software architecture, in which applications pay only for features that they use, and support for virtually synchronousprocess groups, a technology that we developed in our prior work on the<!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><a href="http://www.cs.cornell.edu/Info/Projects/ISIS/ISIS.html"> Isis </a>Toolkit, which has become a significant commercial success.  Horus also offersa fault-tolerant<!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><a href="http://cs-tr.cs.cornell.edu/TR/CORNELLCS:TR93-1354"> securityand privacy </a> technology, which we view as an importantresearch advance.<p>During 1995, we will be extending Horus to provide extremely low latency,high performance<!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><a href="http://www.cs.cornell.edu/Info/People/rvr/papers/rt/novsdav.html">real-time </a> capabilities.  Our approach combines elements ofa communication technology called<!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><a href="http://www.cs.cornell.edu/Info/Projects/ATM/hoti-94.html">Active Messages</a>with a multi-media playbacksystem called<!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><a href="http://www.cs.cornell.edu/Info/Projects/multimedia/mm_home.html">Continuous Media</a>.  By the end of the year, we expect to demonstrate high speed interactive applications with remote multimediaservers, such as might be used in remote telemedicine applications or videoon demand systems.  All of this will retain the existing fault-tolerance andsecurity options of Horus, and its virtual synchrony programming model.<p>Prior work on<!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><a href="http://www.cs.cornell.edu/Info/Projects/ISIS/ISIS.html"> Isis </a>has created a substantial user base, and we expectrapid uptake of Horus within this community as it matures.  Isis users spana wide range of industries, including telecommunications systems, financialtrading systems, stock market automation, factory-floor process control fordiscrete electronic component manufacture, air traffic control, and space-basedcommunications system management and control.  Applications of Isis are beingexplored in several branches of the military, as well as the NSA and othernon-military government branches.  Among the more visible military efforts isthe Naval Hiper-D project, which is exploring the use of Isis in a new systemthat prototypes technologies for future enhancements of the AEGIS battleradar system.  The more demanding applications in this user base would benefitfrom access to Horus, and our initial plan is to make it possible to migrateIsis applications to Horus with few changes, thus benefiting this communityin a direct way.  Technology transition has occured through licensing agreementswith Isis Distributed Systems Inc., a subsidiary of Stratus Computers.  However,all of our Cornell work is also available to researchers at no fee, and isdescribed through detailed publications and programming manuals.<p>Looking to the future, we hope that a mixture of Isis and Horus technologieswill permit us to develop some of the very demanding applications that will beseen in next-generation groupware and planning systems.  The illustration belowshows such an application: a military mission control and planning system that integrates data from a variety of space, air and ground resources anduses this to coordinate actions of various theatre assets.   Systems of thissort will demand the utmost in performance, reliability and security, whilealso tolerating failures and rapidly reconfiguring to respond to changing demands.  Success in our project will thus impact a wide range of both civilianand military technology efforts.<!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><img src="http://www.cs.cornell.edu/Info/Projects/HORUS/ARPA/pics.gif" align="middle" alt="Up"><ADDRESS>Dept. of Computer Science / Cornell University / ken@cs.cornell.edu</ADDRESS>

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