基于Xen的虚拟机迁移时内存优化算法  

Memory Optimization Algorithm of Migration Based on Xen Virtual Machine

作　　者：陈廷伟[1] 张璞[1] 张忠清[1] 

机构地区：[1]辽宁大学信息学院,沈阳110036

出　　处：《计算机科学》2013年第9期64-67,88,共5页Computer Science

基　　金：辽宁省教育科学一般研究项目(L2011004);国家自然科学基金(60903008)资助

摘　　要：为了在云计算环境下进行虚拟机迁移,Xen迁移时采用比较传递页位图和跳过页位图的方式来判断内存页是否重传。针对页位图比较带来多次重传增加网络传送开销的问题,提出基于AR模型的内存优化算法,该算法根据所有记录的内存页修改时间间隔来预测内存页的下次修改时间,当下次修改时间大于某个阈值时进行重传。实验结果表明,基于AR模型的内存优化算法缩短了虚拟机迁移的时间,减少了虚拟机迁移时的网络开销,保证了同台服务器上其它虚拟机的网络带宽应用。In order to migrate the virtual machine in the cloud computing environment,Xen compares the send-page bit- map with the skip-page bitmap when migrating, and determines whether memory pages are retransmitted or not. Aiming at the problem that multiple retransmissions increase network transmission overhead from the comparison, this paper proposed a memory optimization algorithm based on AR modei. According to all recorded intervals in which a memory page is modified, the new algorithm predicts the next modification time of the memory page and retransmits the memory page when the next modification time is greater than a threshold. The results show that the optimization algorithm shortens the migration and network overhead of the virtual machine and ensures the network applications of other vir-tual machines on the same server.

关 键 词：云计算 虚拟机 Xen迁移 AR模型 

分 类 号：TP317.1[自动化与计算机技术—计算机软件与理论]