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CONVOYS DESCRIBED When driving on a two-lane road with no passing one often encounters clusters of cars. This is because a fast-moving car will soon bump into a slow one. The equilibrium state of such a system is for everyone to be in a convoy behind the slowest car. In System R [Astrahan], transactions often bump into one another when contending for shared(More)
continues an excellent tradition. Part of that tradition includes the publication of some of the best papers in a subsequent issue of the Communications of the ACM. The papers from the Seventh SOSP are included here, and give a good indication of the quality of the program from which they were selected. The symposium was excellently organized by the General(More)
Virtual machines have long been used for functional testing of operating systems and to obtain the services of multiple operating systems from a single machine. They have not been used for performance evaluation however, because the timing observed by a program executing in a virtual machine is unpredictable and dependent on such factors as system load,(More)
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