Thinner clouds with preallocation

Ittay Eyal, Flavio Junqueira, Idit Keidar

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Different companies sharing the same cloud infrastructure often prefer to run their virtual machines (VMs) in isolation, i.e., one VM per physical machine (PM) core, due to security and efficiency concerns. To accommodate load spikes, e.g., those caused by flash-crowds, each service is allocated more machines than necessary for its instantaneous load. However, flash-crowds of different hosted services are not correlated, so at any given time, only a subset of the machines are used. We present here the concept of preallocation — having a single physical machine ready to quickly run one of a few possible VMs, without ever running more than one at a given time. The preallocated VMs are initialized and then paused by the hypervisor. We suggest a greedy preallocation strategy, and evaluate it by simulation, using workloads based on previous analyses of flash-crowds. We observe a reduction of 35-50% in number of PMs used compared with classical dynamic allocation. This means that a datacenter can provide per-service isolation with 35%-50% fewer PMs.

Original languageEnglish
Title of host publication5th USENIX Workshop on Hot Topics in Cloud Computing, HotCloud 2013
StatePublished - 2013
Event5th USENIX Workshop on Hot Topics in Cloud Computing, HotCloud 2013 - San Jose, United States
Duration: 25 Jun 201326 Jun 2013

Conference

Conference5th USENIX Workshop on Hot Topics in Cloud Computing, HotCloud 2013
Country/TerritoryUnited States
CitySan Jose
Period25/06/1326/06/13

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Software

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