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Date: Thu, 21 Nov 1996 20:32:01 GMTServer: NCSA/1.4.2Content-type: text/htmlLast-modified: Wed, 15 Nov 1995 23:21:19 GMTContent-length: 2596<html><head> <title>The OPAL Operating System Project</title></head><body><h1>Opal</h1> <p><hr>The Opal project is exploring a new operating system structure, tunedto the needs of complex applications, such as CAD/CAM, where a numberof cooperating programs manipulate a large shared persistent databaseof objects. In Opal, all code and data exists with in a single, huge,shared address space. The single address space enhances sharing andcooperation, because addresses have a unique (for all time)interpretation. Thus, pointer-based data structures can be directlycommunicated and shared between programs at any time, and can bestored directly on secondary storage without the need for translation.This structure is simplified by the availability of a large addressspace, such as those provided by the DEC Alpha, MIPS R4000,HP/PA-RISC, and IBM RS6000.</p><p>Protection in Opal is independent of the single address space;each Opal thread executes within a <i>protection domain</i>that defines which virtual pages it has the right to access.The rights to access a page can be easily transmitted from oneprocess to another. The result is a much more flexible protectionstructure, permitting different (and dynamically changing)protection options depending on the trust relationshipbetween cooperating parties. We believe that this organization canimprove both the structure and performance of complex, cooperatingapplications.<p>An Opal prototype has been built for the DEC Alpha platform on top ofthe Mach operating system.<hr><h2><dl><b>Information Sources</b></dl></h2><UL><li> <!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><a href="http://www.cs.washington.edu/homes/levy/opal/opalpapers.html">List of Opal-related papers</a>. <p></UL><dl><b>Faculty Members</b></dl><UL><li> <!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><a href="http://www.cs.washington.edu/people/faculty/levy.html">Hank Levy</a> <p><li> <!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><a href="http://www.cs.washington.edu/people/faculty/lazowska">Ed Lazowska</a> <p><li> <!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><a href="http://www.cs.duke.edu/~chase/">Jeff Chase</a> (Duke University) <p></UL><dl><b>Current Graduate Students</b></dl><UL><li> <!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><a href="http://www.cs.washington.edu/homes/feeley">Mike Feeley</a> <p><li> <!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><a href="http://www.cs.washington.edu/homes/tiwary">Ashutosh Tiwary</a> <p><li> <!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><a href="http://www.cs.washington.edu/homes/nara/home-page.html">Vivek Narasayya</a> <p><li> <!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><a href="http://www.cs.washington.edu/homes/dylan">Dylan McNamee</a> <p></UL><dl><b>Related Information</b></dl><ul><li> <!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><a href="http://www.cs.dartmouth.edu/cs_archive/sasos/sasos.html">Single address space mailing list archive</a>.<p></ul></html>?? 快捷鍵說明
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