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・ Temporal case
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Temporal isolation among virtual machines
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Temporal isolation among virtual machines : ウィキペディア英語版
Temporal isolation among virtual machines

Temporal isolation or performance isolation among virtual machine (VMs) refers to the capability of isolating the temporal behavior (or limiting the temporal interferences) of multiple VMs among each other, despite them running on the same physical host and sharing a set of physical resources such as processors, memory, and disks.
==Introduction to the problem==
One of the key advantages of using virtualization in server consolidation, is the possibility to seamlessly "pack" multiple under-utilized systems into a single physical host, thus achieving a better overall utilization of the available hardware resources. In fact, an entire Operating System (OS), along with the applications running within, can be run in a virtual machine (VM).
However, when multiple VMs concurrently run on the same physical host, they share the available physical resources, including CPU(s), network adapter(s), disk(s) and memory. This adds a level of unpredictability in the performance that may be exhibited by each individual VM, as compared to what is expected. For example, a VM with a temporary compute-intensive peak might disturb the other running VMs, causing a significant and undesirable temporary drop in their performance. In a world of computing that is shifting towards cloud computing paradigms where resources (computing, storage, networking) may be remotely rented in virtualized form under precise service-level agreements, it would be highly desirable that the performance of the virtualized resources be as stable and predictable as possible.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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