Robust partial-load experiments with Showstopper

Andrej Podzimek, Lubomír Bulej, Lydia Y. Chen, Walter Binder, Petr Tůma

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Concurrent execution of multiple applications leads to varying partial utilization of shared resources. Understanding system behavior in these conditions is essential for making concurrent execution efficient. Unfortunately, anticipating behavior of shared resources at partial utilization in complex systems is difficult, realistic experiments that reproduce and examine such behavior are therefore needed. To facilitate experiments at partial utilization, we present a tool that accurately controls the processor utilization of arbitrary concurrent workloads, either establishing constant partial load or replaying a variable load trace. We validate the ability of the tool to enforce the configured partial utilization on multiple platforms, and use the tool to collect novel information on system behavior at partial utilization levels. In detail, our experiments show how to examine the complex relationship between utilization and throughput, useful for tasks such as performance debugging or system dimensioning, and we show this relationship for the DaCapo benchmarks. Further, we show that CPU pinning (a technique used to improve workload isolation) can benefit from dynamic response to system utilization, improving system efficiency with partial utilization. Finally, we show that the overhead of virtualization also changes with partial utilization and CPU allocation.

Original languageEnglish
Pages (from-to)15-38
Number of pages24
JournalFuture Generation Computer Systems
Volume64
DOIs
Publication statusPublished - 1 Nov 2016
Externally publishedYes

Keywords

  • Load control
  • Partial load
  • Performance evaluation
  • Reproducible load
  • Resource isolation
  • Resource sharing

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