DieCast: testing distributed systems with an accurate scale model
NSDI'08 Proceedings of the 5th USENIX Symposium on Networked Systems Design and Implementation
A Virtual Time System for OpenVZ-Based Network Emulations
PADS '11 Proceedings of the 2011 IEEE Workshop on Principles of Advanced and Distributed Simulation
Virtual Time Integration of Emulation and Parallel Simulation
PADS '12 Proceedings of the 2012 ACM/IEEE/SCS 26th Workshop on Principles of Advanced and Distributed Simulation
S3F: the Scalable Simulation Framework revisited
Proceedings of the Winter Simulation Conference
Fast simulation of background traffic through fair queueing networks
Proceedings of the Winter Simulation Conference
Parallel simulation of software defined networks
Proceedings of the 2013 ACM SIGSIM conference on Principles of advanced discrete simulation
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Combination of emulation and simulation offers the hope of both functional and temporal fidelity when modeling large scale networks and the applications that use them. Emulation of unmodified software gives functional fidelity, but not necessary temporal fidelity. We addressed this in prior work by embedding the OpenVZ virtual machine system in virtual time. Validation reveals that there are network timing errors whose magnitude depend on the length of a virtual machine execution timeslice. A natural question asks to what degree these errors impact the behavior of applications. For instance, if an application is relatively insensitive to these errors, we can increase performance by allowing larger emulation timeslices. We study a variety of applications with different network and CPU demands. We find, surprisingly, that difference in application behavior due to simply using OpenVZ often dominate the errors, implying that we need not be overconcerned about errors due to larger timeslices.