事实上，太多的线程甚至会降低性能，因为它会导致额外的环境切换开销。
Indeed, too many threads will even degrade performance because of the additional context switching overhead.
你需要从寒冷的校园步入温暖的教室，也需要从温暖的环境切换到寒冷的户外。
You're going to be coming in from the cold into overheated classrooms, and in from the heat into classrooms fit for a polar bear.
当您从一个环境切换到另一个环境时—因此也是从一个IP地址切换到另一个IP地址—缓存了这个DNS条目的人将继续尝试使用原来的环境。
When you make the switch from one environment to another-and therefore from one IP address to another-people who have the DNS entry cached will continue to try to use the old environment.
您可以从GCC得到提示：为每个应用程序维护多个环境变量集，并根据手头的工作从一个集合切换到另一个集合。
You can take a cue from GCC: maintain many sets of environment variables per application and switch from one pool to another depending on the work at-hand.
您应该能够对迁移计划的大多数方面胸有成竹，除了环境的实际切换。
You should be able to prove most aspects of your migration plan, except for the actual switch of environments.
例如，如果您经常切换工作区，并且忘了从先前的工作区中删除项目，您可以将单元测试环境恢复到初始状态。
If for example you switch workspaces frequently, and forgot to remove projects from previous workspaces, you could rest the Unit Test Environment back to its initial state.
这个例子展示如何在XA应用程序环境中启用一个受信任上下文和切换用户ID。
This example shows how to enable a trusted context and switch the user ID in an xa application environment.
是用一个门户服务器来发布所有的信息，还是设置多个不同的门户环境，以便用户根据自己的不同需要进行切换。
Will there be a single portal server from which all information will be served, or will you set up several different portal environments which users will switch to for different needs.
在软件开发这样的复杂任务环境中上下文切换也是个问题。
Context switching in a complex task environment like software development is a major problem.
本文解释的切换过程适合这个场景，已经在实验室环境中测试过了。
The switchover process explained in this article works fine in this scenario and has been tested under lab conditions.
如果我们有一个RES配置列表可用于开发、测试和生产环境，则可以更轻松地切换目标RES。
It is much easier to switch the target RES if we have a list of RES configuration available for development, testing and production environments.
存在一个构建时任务以创建备用环境，以及一个运行时任务以在主节点和辅助节点之间切换。
There is a build time task to create the standby environment and run time tasks to toggle between the primary and secondary nodes.
对不同的用途使用不同的工具迫使我过于频繁地切换环境。
Using different tools for different purposes forces me to switch contexts too often.
在许多情况下，您希望能够方便地切换被调用的服务端点；其中一种情况是从开发环境转移到测试环境。
There are many situations in which you want to be able to easily switch the endpoint of the service being called; one is as you move from a development environment to a test environment.
例如，许多Ruby开发人员使用这种方法来在不同的Ruby版本间切换，根据需要更改环境变量PATH、GEM_HOME和GEM_PATH，从一个版本跳到另一个版本。
For instance, many Ruby developers use such a solution to switch between Ruby versions, changing environment variables PATH, GEM_HOME, and GEM_PATH as needed to hop from one version to another.
RI视图非常有用，它允许您关注并且保持在开发环境内，而不必切换到Web浏览器或者其他应用程序中查看文档。
The RI view can be very helpful by allowing you to stay focused and within your development environment, instead of switching to a Web browser or another application to view the documentation.
在安装真实的根、切换为使用真实的根并销毁initialRAMdisk之前，任何步骤都可以在此初始环境中执行。
Any number of arbitrary steps can then be performed in this initial environment before the real root is mounted and we switch to using the real root and destroy the initial RAM disk.
在连接切换到新的用户时完全清除用户环境，从而保护用户不受前一个连接用户的影响。
Complete cleanup of the user environment when a connection is switched to a new user, thereby protecting users from spill-overs from previous connection users.
如果您切换至TestEnvironment项时(如图8所示)，您可以看到一副不同的景象，它最终会包含您将会碰到的每一个环境。
If you switch tabs to the Test environment TAB (as shown in Figure 8), you see a different view, which will eventually contain each environment that you want to cover.
在包含了HATSWeb服务的这个项目运行在内部测试环境后，切换回egl RichUI透视图并单击preview选项卡。
After the project containing the HATS web service is running in the internal test environment, switch back to the EGL Rich UI perspective and click the Preview TAB.
切换到Variables选项卡，编辑MQ _ INSTALL_ROOT环境变量来指向您的WebSphere MQ安装目录。
Switch to the Variables TAB, and edit the MQ_INSTALL_ROOT environment variable to point your WebSphere MQ installation directory.
智能切换Wi - Fi和3g环境已经支持更多的无线设备和3g卡，对于大多数用户来说有更顺畅的体验。
Intelligent switching between Wi-Fi and 3g environments has been broadened to support more wireless devices and 3g CARDS, resulting in a smoother experience for most users.
如果您使用了msg对象并且要求根据(被分配了msg对象的)使用者的需要来切换语言环境，这将是非常有用的。
This is useful if you pool Msg objects and have to switch its locale based on the user to which the object is currently assigned.
此外，必须切换环境来访问每一个产品，在SourceForge和Rally上用不同的登录身份，这令我们遇到了冲突。
Besides, having to switch context to access each of these products, with different login identities on SourceForge and Rally, we encountered a clash.
LUN - level切换技术只有在使用DS8000存储服务器环境下才能采用，它可以在分区间或在系统间切换IASP。
LUN-level switching is only available when using the DS8000 storage server and can switch the IASP between partitions or between systems.
这种使用ProjectExplorer的优势在于，您所编辑的文件就会一直处于可见状态，这样就不需要切换环境了。
The benefit of using the Project Explorer in this way is that the document that you are editing is always visible so that no context switching is required.
事实上，您可以从GCC获得一个暗示：可以为每个应用程序维护多个环境变量集合，根据手边的工作从一个集合切换到另一个集合。
In fact, you can take a cue from GCC: Maintain many sets of environment variables per application and switch from one pool to another depending on the work at-hand.
如果您的环境有可能切换到不同的供应商，您可以考虑使用JNDI来帮助抽象细节。
If switching vendors is a possibility in your environment, you may consider using JNDI to help abstract the details.
与任何生产环境一样，建议对系统设置(包括切换过程)进行彻底的测试，然后再应用于生产环境。
As with any production environment, we recommend that your system setup, including the switchover process, be thoroughly tested and documented before it is applied in production.
与任何生产环境一样，建议对系统设置(包括切换过程)进行彻底的测试，然后再应用于生产环境。
As with any production environment, we recommend that your system setup, including the switchover process, be thoroughly tested and documented before it is applied in production.
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