Betriebssysteme · Institut für Systemarchitektur · Fakultät Informatik · TU Dresden



22. 03. 2013

Time Virtualization in NOVA and Vancouver


Meike Zehlike

TU Dresden

Verteidigung der Belegarbeit

Time in computing represents a resource with quite particular characteristics. It has a unique, irreversible direction and passes regularly, meaning that its state changes without interference. Today's systems usually consist of several time sources, which measure passage of time since system boot independently from each other. The attempt to virtualize any of those must not contradict the characteristics of time. Yet no sophisticated hardware or software solutions are available for virtualization environments. The issue here is that a virtual machine can be preempted at any point in time. This work presents an approach to virtualize time in a manner that does not invalidate what an operating system assumes. In spite of preemptions a virtual machine shall observe time passing with the same characteristics as it would when running on bare metal.
16. Jan 2018
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