这个过程称为交换，因为页面会被从内存交换到硬盘上。
This process is called swapping because the pages are swapped from memory onto the hard disk.
最大化系统内存通常会通过减少内存交换来提升系统系能。
Maximizing system memory generally improves system performance by minimizing swapping.
正如%准备%使用，使用的内存交换和磁盘总线重置，报告可以为您提供度量标准。
Reports give you metrics like percent ready, percent used, memory swap used and disk bus resets.
在默认的Fedora7安装中，系统在内存交换上花了许多时间(是您的时间)。
With a default Fedora 7 install, the system spends a lot of its time (and yours) swapping.
您要求的缓冲区大小可能导致由于内存交换而丢失帧。您确定要分配这样大小的缓冲区吗？
The buffer size you have requested may cause frames to be dropped due to swapping. Are you sure you want to allocate a buffer of this size?
如果系统将过多的时间花在存在开销的任务上(比如内存交换)，则需要指定更少数量的线程。
If your system spends too much time on overhead tasks, such as swapping memory, you might need to specify a lower number of threads.
请记住基本的操作系统也有必须被考虑的内存要求，在所有的操作系统环境中，内存交换会对应用程序性能产生负面影响。
Remember that the base operating system also has memory requirements that must be accounted for, and that swapping negatively impacts application performance in all operating system environments.
然而，任务再无法并行运行，或使用多个CPU，它会使用更少的内存，并会运行得更快，因为InfoSphereDataStage服务器不需要再进行内存交换。
While the job will no longer run in parallel, or use multiple CPUs, it will use less memory and run faster because the InfoSphere DataStage server no longer has to swap.
如图10所示，您可以获得不同时间段内关于内存、交换、磁盘使用和度量的类似信息。
As in Figure 10, you can get similar information and memory, swap, disk usage, and measurements over different time periods.
交互方之一定义用于数据交换的底层内存分配机制。
One of the interacting parties defines the underlying memory allocation mechanism for data exchange.
注意过高的CPU利用率和内存分页或交换——这些都是性能杀手。
Look for excessive CPU utilization and memory paging or swapping — these are performance killers.
释放空间使底层操作系统减小对交换空间的许求并且重用内存映射表。
Releasing space allows the underlying operating system to cut down on swap space requirements and reuse memory mapping tables.
系统现在可以全部装入物理内存，而不必借助慢速的基于磁盘的交换空间。
The system is able to fit everything into physical memory without having to resort to slow, disk-based swap space.
有些变体保留所有应用程序中的数据副本——同时包括内存和交换空间中的应用程序。
Some keep a copy of the data in all applications — both memory and swap space.
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。
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.
如果您知道内存足以处理工作负载，最好推迟这两种交换活动。
If you know you have enough memory to handle your workload, you are better off delaying these two swap activities.
此工作负载中的内存利用主要是由文件I/O 引起，而不是匿名内存，几乎没观察到交换活动。
Memory usage in this workload is primarily attributable to file I/O, not anonymous memory, and very little swap activity is observed.
该命令存放在缓存中，与返回数据的内存空间在进程中交换数据。
The command is included in a buffer being exchanged in the process along with the space left for returned data.
在SLES8 上，只有2GB 的内存用作中央内存，因为这是一个 31 位的操作系统，有 2 GB 的扩展内存用作交换空间。
On SLES 8, only 2 GB used for central memory because of the 31-bit operating system, and 2 GB expanded memory used for swap space.
操作系统可以将物理内存中的数据移动到未使用的交换区，以便于最充分地利用物理内存。
The OS can move data held in physical memory to and from a swap area when it isn't being used, to make the best use of physical memory.
例如，假设一个内存区当前在交换空间中，而另一个在内存中。
For example, let's say that one area of memory is currently in swap space while another one is in memory.
在SLES8上，仅使用了2GB的中心内存，因为是31位的操作系统，2 GB的扩展内存将用于交换空间。
On SLES 8, only 2 GB were used for central memory, because of the 31-bit operating system, 2 GB expanded memory for swap space.
即使形式上比较顺利的算法，如果它们使用了太多的内存以至于需要进行交换，那么它们也会慢得要命。
Even formally favorable algorithms can slow catastrophically if they use so much memory as to require swapping.
Psyco 需要很大的内存开销，如果机器进入交换，它甚至会抵销 Python 获得的任何性能。
Psyco has a large memory overhead which might even negate any gains if the machine has to go to swap.
vmstat工具输出线程/进程信息、内存/交换区使用率、换进/换出页面、磁盘I/O、页面错误和CPU统计信息。
The vmstat tool outputs thread/process information, memory/swap usage, page ins/outs, disk I/O, page faults, and CPU statistics.
前两个条目还将RESIDENT参数设置为- 1，这告诉Linux将所有Informix内存碎片保留在内存中，不要将它们交换到磁盘。
The top two also set the RESIDENT parameter to -1, which tells Linux to keep all the Informix memory segments in memory and not swap them to disk.
在SLES8 上，仅使用了2GB的中心内存，因为是31 位的操作系统，2 GB 的扩展内存将用于交换空间。
On SLES 8, only two GB were used for central memory because of the 31-bit operating system, and two GB expanded memory for swap space.
复制收集的优点是只访问活跃的对象，这意味着不会检查垃圾对象，也不需要将它们页交换到内存中或者送到缓存中。
Copying collection has the advantage of only visiting live objects, which means garbage objects will not be examined, nor will they need to be paged into memory or brought into the cache.
该命令显示系统中的空闲内存、已使用的物理内存和交换内存的总量，以及内核所使用的缓冲区。
The command displays the total amount of free, used physical, and swap memory in the system, as well as the buffers used by the kernel.
该命令显示系统中的空闲内存、已使用的物理内存和交换内存的总量，以及内核所使用的缓冲区。
The command displays the total amount of free, used physical, and swap memory in the system, as well as the buffers used by the kernel.
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