NDLI: Limitation Of Optimism In The Time Warp Operating System

Content Provider	IEEE Xplore Digital Library
Author	Reiher, P.L. Jefferson, D. Wieland, F.
Copyright Year	1989
Description	Author affiliation: Jet Propulsion Laboratory (Reiher, P.L.)
Abstract	Optimistic systems execute events out of order and must undo their errors to produce correct results. Undoing incorrect work can be expensive. By restraining their optimism, such systems might execute fewer events out of order and thereby run faster. This paper examines two methods tested in the Time Warp Operating System. The first method explicitly prevents from executing in the far simulation future. The second method tries to identify objects that are doing work that has to be undone; such objects are allowed to execute less often. Experimental results show that only modest gains were realized, and that even these gains were unpredictable. While other methods remain untested, the value of limiting optimisim seems small.
Starting Page	765
Ending Page	770
File Size	497198
Page Count	6
File Format	PDF
ISBN	0911801588
DOI	10.1109/WSC.1989.718752
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1989-12-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Operating systems Discrete event simulation Time warp simulation Optimization methods Propulsion Laboratories Computer science Computational modeling Computer simulation Velocity measurement
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Limitation Of Optimism In The Time Warp Operating System