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Simple and Fast Wait-Free Snapshots for Real-Time Systems

Håkan Sundell (Institutionen för datavetenskap, Datakommunikation och Distribuerade System) ; Philippas Tsigas (Institutionen för datavetenskap, Datakommunikation och Distribuerade System) ; Yi Zhang (Institutionen för datavetenskap, Datakommunikation och Distribuerade System)
Proceedings of the 4th International Conference On Principles Of Distributed Systems (OPODIS 2000) p. 91-106. (2000)
[Konferensbidrag, refereegranskat]

A wait-free algorithm for implementing a snapshot mechanism for real-time systems is presented in this paper. Snapshot mechanisms give the means to real-time task to read a globally consistent set of variable values while other concurrent tasks are updating them. Such a mechanism can be used to solve a variety of communication and synchronisation problems, including system monitoring and control of real-time applications. Typically, implementations of such mechanisms are based on interlocking. Interlocking protects the consistency of the shared data by allowing only one process at a time to access the data. In a real-time environment locking typically leads to difficulties in guaranteeing deadlines of high priority tasks because of the blocking. Researchers have introduced non-blocking algorithms and data structures that address the above problems. In this paper we present a simple and efficient wait-free (non-blocking) snapshot algorithm by making use of timing information that is available and necessary to the scheduler that schedules the tasks of real-time systems. Experiments on a SUN Enterprise 10000 multiprocessor system show that the algorithm that we propose here, because of its simplicity, outperforms considerably the respective wait-free snapshot algorithm that is not using the timing information.

Nyckelord: Concurrent, snapshot, wait-free, real-time

Denna post skapades 2006-08-25.
CPL Pubid: 318


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Institutioner (Chalmers)

Institutionen för datavetenskap, Datakommunikation och Distribuerade System (2002-2004)


Information Technology

Chalmers infrastruktur