A virtual time system for virtualization-based network emulations and simulations

Y. Zheng, D. M. Nicol, D. Jin, N. Tanaka

Research output: Contribution to journalArticlepeer-review

Abstract

Simulation and emulation are commonly used to study the behaviour of communication networks, owing to the cost and complexity of exploring new ideas on actual networks. Emulations executing real code have high functional fidelity, but may not have high temporal fidelity because virtual machines usually use their host's clock. To enhance temporal fidelity, we designed a virtual time system for virtualization-based network emulations and simulations, such that virtual machines perceive time as if they were running concurrently in physical world. Our time virtualization is not exact: there exist temporal errors primarily due to scheduler timeslice, which is tunable in our system. We then study the tradeoff between temporal fidelity and execution speed under different lengths of timeslices, both experimentally and analytically. We demonstrate that our virtual time system is flexible such that it can achieve different level of temporal accuracy at the cost of different execution speed.

Original languageEnglish (US)
Pages (from-to)205-213
Number of pages9
JournalJournal of Simulation
Volume6
Issue number3
DOIs
StatePublished - Aug 2012

Keywords

  • network emulation
  • virtual machines
  • virtual time

ASJC Scopus subject areas

  • Software
  • Modeling and Simulation

Fingerprint Dive into the research topics of 'A virtual time system for virtualization-based network emulations and simulations'. Together they form a unique fingerprint.

Cite this