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。
关键词:
概率预测,
预拷贝,
虚拟机,
实时迁移,
总迁移时间
Abstract: 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.
Key words:
probability prediction,
pre-copy,
Virtual Machine(VM),
real-time migration,
total migration time
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