基于概率预测的改进虚拟机内存预拷贝方法  

Improved Memory Pre-copy Method of Virtual Machine Based on Probability Prediction

作　　者：陈廷伟[1] 姜雅楠[1] 

机构地区：[1]辽宁大学信息学院,沈阳110036

出　　处：《计算机工程》2015年第7期289-293,共5页Computer Engineering

基　　金：国家自然科学基金资助项目(61174115);辽宁省教育厅科学研究基金资助一般项目(L2011004)

摘　　要：预拷贝技术实现了虚拟机的透明移动,但在迭代过程中一些内存页会被反复拷贝,使用概率预测方法可以减少传输的内存页数量,但预测所需的时间仍会延长总迁移时间。针对此问题,提出快速预测预拷贝方法,对内存页状态改变的概率进行测算,并推迟状态频繁变化页的传输,达到优化虚拟机实时迁移的目的。应用于Xen虚拟机的实验结果表明,该方法可减少传输的内存页,缩短总迁移时间。Virtual Machine （VM）is moved transparently by pre-copy. The pre-copy transfers memory pages iteratively and some memory pages are copied again and again during the iterative process. Although the probability prediction method can reduce the number of transferred memory pages, the prediction time is still too long. For this problem, Fast Prediction Pre-copy （FPP） is proposed, to calculate the probability of pages which are modified and then put off the transmission time of them, achieving the purpose of optimizing the real-time migration of VM. Applying the above method to Xen, experimental results show that this method shortens the total migration time and transferred memory pages, and reduces the migration overhead.

关 键 词：概率预测 预拷贝 虚拟机 实时迁移 总迁移时间 

分 类 号：TP302[自动化与计算机技术—计算机系统结构]