夏令时 (DST)^{(Daylight Saving Time (DST))}，也是夏令时^{(daylight savings time)}或夏令时^{(daylight time)}和夏令时^(summertime)，是在温暖的月份提前时钟的做法，以便根据时钟每天晚些时候黑暗下降。如果您在配置 DST 时注意到 Windows 10中的^{(Windows 10 when DST is configured)}CPU和内存使用率很高，那么这篇文章旨在帮助您。在这篇文章中，我们将确定可能的原因，然后提供相应的解决方法以及您可以尝试解决问题的解决方案。

让我们看一个典型的场景，在这个场景中您可能会遇到DST设置导致Windows 10上^{(Windows 10)}CPU和内存使用率高的问题。

您有一台运行 Windows 10 的计算机使用夏令时 ( DST ) 更改发生在午夜 (12:00 AM) 而不是凌晨 2:00 的时区。在这种情况下，您可能会遇到以下问题。

问题 1^{(Issue 1)}
TaskHostw.exe进程^{(TaskHostw.exe)}消耗 100% 的CPU资源。因此，系统性能^{(system performance)}和电池寿命会^{(battery life decrease)}急剧下降。在小型设备上，此问题可能会影响热管理，因为该过程会持续循环运行以进行时间转换计算。

问题 2^{(Issue 2)}页面文件^(pagefile)
消耗过多的磁盘资源，导致磁盘利用率过高。

问题 3^{(Issue 3)}
内存使用过多^{(Excessive memory use)}。

问题 4^{(Issue 4)}
磁盘、CPU 或内存使用过多^{(Excessive disk, CPU, or memory use)}会导致计算机挂起或冻结。

夏令时^{(Daylight Saving Time)}设置导致CPU和内存使用率高

此夏令时 (DST) 设置问题会导致^{(high CPU & memory usage)(Daylight Saving Time (DST) setting causes high CPU & memory usage)}Windows 10上的 CPU 和内存使用率过高，这是因为运行energy.dll^(energy.dll)计划任务之一的TaskHostW.exe 进程^{(TaskHostW.exe process)} （Windows服务的通用主机进程）中的竞争条件. 此计划任务^{(scheduled task runs)}根据计算机上设置的时间运行。此问题仅在DST更改当天出现。

当DST更改发生在午夜而不是凌晨 2:00 时，将加载energy.dll文件。

如果您遇到此问题，您可以尝试下面描述的我们推荐的解决方案或解决方法（根据您的要求）来缓解问题。

要解决此问题^{(resolve this issue)}，请将您的计算机升级到最新版本的 Windows 10。

如果出于某种原因，例如您希望继续安装当前的Windows 10，而不是升级或升级到最新版本的Windows 10，或者您已经在运行最新版本的Windows 10但问题未解决您可以尝试下面提供的解决方法。

要解决此问题^{(work around the issue)}，您需要使用以下方法之一禁用电源效率诊断任务。^{(disable the Power Efficiency Diagnostics task)}

1. 使用任务计划程序 UI^{(Task Scheduler UI)}（用户界面^{(User Interface)}）
2. 使用命令提示符

让我们看一下步骤的描述，因为它涉及解决DST设置导致Windows 10上^{(Windows 10)}CPU和内存使用率高的每种方法。

1]使用^(Use)任务计划程序UI^{(Task Scheduler UI)}（用户界面^{(User Interface)}）

要使用任务计划程序^{(use the Task Scheduler)}禁用电源效率诊断任务， ^{(disable the Power Efficiency Diagnostics task, )}请执行以下操作：

• 按 Windows key + R 调用“运行”对话框。
• 在“运行”对话框中，键入 taskschd.msc 并按 Enter 以打开任务计划程序^{(open the Task Scheduler)}控制台。
• 在任务计划程序控制^{(Task Scheduler)}台中，导航到以下内容：

Task Scheduler Library > Windows > Power Efficiency Diagnostics

• 在中间窗格中，选择并右键单击 分析系统。^{(AnalyzeSystem.)}
• 单击禁用^(Disable)。

您可以退出任务计划程序^{(Task Scheduler)}控制台。

2]使用命令提示符

要使用命令提示符^{( use the Command Prompt)}禁用电源效率诊断任务， ^{(disable the Power Efficiency Diagnostics task, )}请执行以下操作：

• 按Windows key + R调用“运行”对话框。
• 在“运行”对话框中，键入cmd，然后按CTRL + SHIFT + ENTER以open Command Prompt in admin/elevated mode。
• 在命令提示符窗口中，复制并粘贴下面的命令，然后按 Enter^(Enter)。

schtasks /Change /TN "\Microsoft\Windows\Power Efficiency Diagnostics\AnalyzeSystem" /DISABLE

您现在可以在命令执行后退出命令提示符。但是，您可以通过运行以下命令查询任务的状态以确认更改已应用：

schtasks /Query /TN "\Microsoft\Windows\Power Efficiency Diagnostics\AnalyzeSystem"

输出应如下所示：

Folder: \Microsoft\Windows\Power Efficiency Diagnostics
TaskName Next Run Time Status
===================== =========== ===============
AnalyzeSystem N/A Disabled

That’s it!

完成变通办法或解决方案本身后，应解决由夏令时 (DST) 设置导致的 Windows 10 上^{(Daylight Saving Time (DST) setting )}CPU 和内存使用率高^{(high CPU & memory usage)}的问题。

DST setting causes high CPU & memory usage on Windows 10

Daylight Saving Time (DST), also daylight savings time or daylight time and summertime is the practice of advancing clocks during warmer months so that darkness falls later each day according to the clock. If you notice high CPU and memory usage in Windows 10 when DST is configured, then this post is intended to help you. In this post, we will identify the possible cause and then offer the corresponding workaround as well as the solution you can try to remediate the issue.

Let’s take a look at a typical scenario where you can encounter this issue of DST setting causes high CPU & memory usage on Windows 10.

You have a computer that’s running Windows 10 to use a time zone where daylight saving time (DST) changes occur at midnight (12:00 AM) instead of at 2:00 AM. In this situation, you may experience the following issues.

Issue 1
The TaskHostw.exe process consumes 100 percent of CPU resources. Therefore, system performance and battery life decrease dramatically. On small form factor devices, this issue may affect thermal management, as the process keeps running in a loop doing time conversion calculations.

Issue 2
The pagefile consumes excessive disk resources, which triggers high disk utilization.

Issue 3
Excessive memory use occurs.

Issue 4
Excessive disk, CPU, or memory use causes the computer to hang or freeze.

Daylight Saving Time setting causes high CPU & memory usage

This issue of Daylight Saving Time (DST) setting causes high CPU & memory usage on Windows 10 occurs because of a race condition in the TaskHostW.exe process (a generic host process for Windows services) that runs one of the energy.dll scheduled tasks. This scheduled task runs according to the time that’s set on the computer. This issue occurs only on the day when DST changes.

The energy.dll file is loaded when DST changes occur at midnight instead of at 2:00 AM.

If you’re faced with this issue, you can try our recommended solution or workaround (per your requirement) described below to mitigate the issue.

To resolve this issue, upgrade your computer to the latest version of Windows 10.

If for one reason or the other, like you prefer to stay on your current Windows 10 install and not upgrade or upgrading to the latest version of Windows 10 or you’re already running the most current version of Windows 10 but the issue is not resolved you can try the workaround offered below.

To work around the issue, you need to disable the Power Efficiency Diagnostics task by using one of the following methods.

1. Use the Task Scheduler UI (User Interface)
2. Use the Command Prompt

Let’s take a look at the description of the steps as it concerns each of the methods to resolve the DST setting causes high CPU & memory usage on Windows 10.

1] Use the Task Scheduler UI (User Interface)

To use the Task Scheduler to disable the Power Efficiency Diagnostics task, do the following:

• Press Windows key + R to invoke the Run dialog.
• In the Run dialog, type taskschd.msc and hit Enter to open the Task Scheduler console.
• In the Task Scheduler console, navigate to the following:

Task Scheduler Library > Windows > Power Efficiency Diagnostics

• In the middle pane, select and right-click AnalyzeSystem.
• Click Disable.

You can exit the Task Scheduler console.

2] Use the Command Prompt

To use the Command Prompt to disable the Power Efficiency Diagnostics task, do the following:

• Press Windows key + R to invoke the Run dialog.
• In the Run dialog box, type cmd and then press CTRL + SHIFT + ENTER to open Command Prompt in admin/elevated mode.
• In the command prompt window, copy and paste the command below and hit Enter.

schtasks /Change /TN "\Microsoft\Windows\Power Efficiency Diagnostics\AnalyzeSystem" /DISABLE

You can now exit the command prompt once the command executes. But, you can query the status of the task to confirm that the changes applied by running the following command:

schtasks /Query /TN "\Microsoft\Windows\Power Efficiency Diagnostics\AnalyzeSystem"

The output should appear as follows:

Folder: \Microsoft\Windows\Power Efficiency Diagnostics
TaskName Next Run Time Status
===================== =========== ===============
AnalyzeSystem N/A Disabled

That’s it!

After completing the workaround or the solution itself, the issue of high CPU & memory usage on Windows 10 caused by Daylight Saving Time (DST) setting should be resolved.

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