To understand the reverse mapping technique, let's quickly go through some fundamentals of the Linux virtual memory system.
为了理解反向映射技术，让我们来首先简单了解Linux虚拟内存系统的一些基本原理。
The whole point of a virtual memory system is that you can have a virtual address space that's much bigger than the amount of physical memory on the computer.
一个虚拟内存系统的全部重点就是：你可以拥有一个虚拟的地址空间，它比计算机上的物理内存总量还要大。
Experimental results show that this method extends the problem sizes that can be efficiently solved and its performance is better than the virtual memory system while the data set is large.
实验结果表明，该方法扩展了可有效解决的核外问题规模，大数据量时的计算性能优于虚存系统。
It reports on all layers of file system utilization, including the Logical Volume Manager (LVM), virtual memory, and physical disk layers.
它报告文件系统的所有层的使用率，包括逻辑卷管理器(LVM)、虚拟内存和物理磁盘层。
Before executing, the test adjusts its total memory usage according to how much real and virtual memory exist on the system.
在执行之前，测试会根据系统中存在多少物理和虚拟内存来调整其总的内存使用情况。
They compare this situation to the time when developers had to seemingly write operating system level code to handle "multi-tasking" or "virtual memory management".
他们将这种情形比作开发者似乎不得不要书写操作系统级别代码来处理“多任务”或“虚拟内存管理”的时代。
I discuss how AIX USES virtual memory to address more memory than is physically on your system.
我将介绍AIX如何使用虚拟内存来寻址比系统中物理内存更大的内存。
We discuss how AIX 7 USES virtual memory to address more memory than is physically on your system.
我们将介绍AIX7如何使用虚拟内存来寻址比系统物理内存更大的内存。
He's created a way for people to use an older model computer as a "virtual desktop," outsourcing its processing power, memory and operating system to another piece of equipment located down the hall.
他已经发明了一种方法，让人们用老式电脑作为“虚拟桌面”，将其处理性能、内存和操作系统外包到某个中心的另一台设备上。
If you try to tune a server when there is no free CPU or where the operating system is swapping virtual memory, you won't get very far.
如果您在没有空闲cpu时或者在操作系统需要交换虚拟内存的地方试图优化服务器，则无法使其变得很快。
It shows the used and free sizes of real and virtual memory in the system.
它显示系统中真实内存和虚拟内存的使用量和空闲量。
Conversely, when the usage of a virtual system is lower than the predefined threshold for a certain time, idle nodes are removed or memory is drawn back.
相反的，当虚拟系统的使用在某段时间内低于预定义的阈值，空闲的节点就被删除、或者内存就被收回。
The operating system's virtual memory subsystem allows applications to allocate more memory than actually exists on the system, with the shortage being made up by temporary storage on disk.
操作系统的虚拟内存子系统允许应用程序分配的内存超过系统上实际存在的内存量，不足的部分由磁盘上的临时存储组成。
After the virtual image is copied to the hypervisor, you can specify any changes to the default resource allocation of CPU and memory required by the operating system in the new environment.
将虚拟映像复制到管理程序后，您可以指定新环境中操作系统所需的CPU和内存的缺省资源位置的任何更改。
Note: Memory Windows extends system wide virtual capacity for 32-bit applications only.
注意：内存窗只是为32位应用程序扩展了系统范围的虚拟容量。
When configuring IDS memory, we need to consider the total available memory, both physical RAM and virtual memory and daily load on the system.
在配置IDS内存时，我们需要考虑总的可用内存，包括物理ram、虚拟内存和系统上的日常负载。
The physical memory that is mapped for the guest operating system is actually virtual memory mapped into the process.
映射给客户操作系统的物理内存实际上是映射给这个进程的虚拟内存。
All UNIX operating systems support a system of virtual memory (VM).
所有unix操作系统都支持某种虚拟内存(VM)系统。
You also spent some time troubleshooting a system that had some performance problems that you were able to pin (pardon the pun) on virtual memory.
您还学习了如何对存在性能问题的系统进行故障排除，您可以对虚拟内存进行控制。
Therefore, that virtual system appears to be running on a piece of hardware (that is, a virtual server) with only 1gb of memory.
因此，虚拟机系统看起来好像是在一个只有1GB内存的硬件(其实就是一个虚拟机服务器)上运行。
For example, high virtual memory use can indicate that a system simply requires additional memory to increase performance.
比如，高虚拟内存使用率表示系统仅需增加一些内存来提升性能。
When running on a system with more process address space than physical memory, a memory leak or excessive use of native memory will force the OS to swap out some of the virtual address space.
在进程地址空间大于物理内存的系统中，内存泄漏或本机内存过度使用会迫使操作系统提供一些虚拟地址空间。
It's important to understand that the VMM services all memory requests from the system, not just virtual memory.
VMM为系统中所有的内存请求(而不仅仅是虚拟内存的内存请求)提供服务，了解这一点是非常重要的。
Is this different than the maximum virtual memory for the system?
它与系统的最大虚拟内存一样吗？
Before you install your operating system, we recommend adding another 256 MB of memory to the virtual machine for a total of 512 MB.
在安装操作系统之前，建议给虚拟机增加256MB的内存，达到512 MB。
This is because Oracle uses a lot of virtual memory, particularly with respect to its System Global Area (SGA), which is used to cache table data, among other things.
这是因为Oracle使用大量的虚拟内存，特别是对于其系统全局区域（SGA），这个区域用于缓存表数据和其他东西。
This is because Oracle USES a lot of virtual memory, particularly with respect to its System Global Area (SGA).
这是因为Oracle使用了大量的虚拟内存，特别是对于其系统全局区(SGA)。
When the application is running the Windows management system will distribute the data held by the application between physical memory (RAM) and virtual memory on disk.
当应用程序准备运行时，windows管理系统将在磁盘上的物理内存(RAM)和虚拟内存之间分配应用程序拥有的数据。
You simply shut down the guest operating system, change the setting for total memory, and then start up the virtual machine, as shown in Figure 5 below.
只需关闭客户操作系统(guest operating system)，将设置更改为使用全部内存，然后启动虚拟机，如下面的图5所示。
You simply shut down the guest operating system, change the setting for total memory, and then start up the virtual machine, as shown in Figure 5 below.
只需关闭客户操作系统(guest operating system)，将设置更改为使用全部内存，然后启动虚拟机，如下面的图5所示。
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