NDLI: Performance of a riskfree Time Warp operating system

Content Provider	ACM Digital Library
Author	Bellenot, Steven
Abstract	Optimistic methods of synchronizing parallel discrete event simulations can be risky by sending (positive) messages (events) before they have been committed. Risky methods often use anti-messages (negative messages) to cancel incorrectly sent positive messages. Riskfree methods are more conservative, they do not send messages until they are known to be correct. The Time Warp Operating System (TWOS) uses anti-messages. Riskfree TWOS is implemented and tested on the standard TWOS benchmarks. Performance of the riskfree TWOS is dependent on the amount of lookahead in the simulation. Good lookahead was required for even reasonable performance. Tracker, a simulation of the riskfree simulation, is used to give idealized best case riskfree performance. BeRisky is an example simulation which has a speedup of n for Time Warp, but only a speedup of 2 for riskfree methods.
Starting Page	155
Ending Page	158
Page Count	4
File Format	PDF
ISBN	1565550552
DOI	10.1145/158459.158479
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1993-07-01
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
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Performance of a riskfree Time Warp operating system