The ability to enable multiple virtual networks on common infrastructure with different network architectures has been gaining critical importance recently mainly because this kind of sharing does not incur any additional equipment cost for operators. An aim of our ongoing research is to take pragmatic approach towards infrastructure sharing applying operator differentiation and provide a solut...

By John Shaughnessy S taff R ep o rte r T h e In d ia n a H o u se of R ep resen ta tiv es will vote e ither T hu rsday or F rid a y on low ering the s ta te 's d rink ing age to 19, accord ing to Tom B lack, coo r­ d in a to r of the N otre D am e S tudent Lobby. A lthough B lack exp ressed op­ tim ism th a t the House will approve the bill, HR No. 1104, he s ta ted "the strong co n se rv a ti...

The paper studies the impact of several lock manager designs on the overhead imposed to a persistent programming language by automated object locking. Our study reveals that a lock management method based on lock state sharing outperforms more traditional lock management designs. Lock state sharing is a novel lock management method that represents all lock data structures with equal values with...

From a project on upgrading an existing commercially used operating system for support of a distributed system architecture, we present results and experience from a comprehensive analytical performance evaluation of a large number of different implementation strategies for distributed lock management. The various lock management policies we consider differ in the management of the lock databas...

Parallel programs running on shared memory multiproces sors coordinate via shared data objects structures To en sure the consistency of the shared data structures programs typically rely on some forms of software synchronisations Unfortunately typical software synchronisation mechanisms usually result in poor performance because they produce large amounts of memory and interconnection network c...