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Overview:

This paper presents Flexible Task Graphs (Flexotasks), a single system that allows different isolation policies and mechanisms to be combined in an orthogonal manner, subsuming four previously proposed models as well as making it possible to use new combinations best suited to the needs of particular applications. The paper evaluates the implementation on top of the IBM Web-Sphere Real Time Java virtual machine using both a microbenchmark and a 30 KLOC avionics collision detector. The paper shows that Flexotasks are capable of executing periodic threads at 10 KHz with a standard deviation of 1.2µs and that it achieves significantly better performance than RTSJ's scoped memory constructs while remaining impervious to interference from global garbage collection.

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Format:PDFSize:818 KB
Date:Jun 2008
Pages:11

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