UTC VM与本地GPS之间的UTC时间偏移 [英] UTC Time offset between Azure VM and a local GPS

问题描述

调用  GetSystemTimePreciseAsFileTime
与使用GPS的本地PC相比。我们将在Azure和PC上运行部分模拟，并且需要UTC时间同步/精确。

What is the expected (or worse case) between call to GetSystemTimePreciseAsFileTime on Azure vs a local PC with a GPS. We will be running part of our simulation on Azure and on pc and need the UTC time to be synchronize / precise.

关注https://docs.microsoft.com/en中的文档-us / azure / virtual-machines / windows / time-sync似乎预计会有1 ms的偏移量。有没有办法在Azure VM中接近UTC时间的100us最大偏移量？ 

Following the doc in https://docs.microsoft.com/en-us/azure/virtual-machines/windows/time-sync it seem that 1 ms offset is to be expected. Is there any way to get closer to 100us maximum offset in UTC time in Azure VM ? 

谢谢

RéjeanS。 

Réjean S. 

推荐答案

您找到的文档是我们在Azure中进行时间同步的最佳信息。我不知道如何将可能的偏移减少到不到1毫秒。时间同步由您无法控制的平台处理。话虽这么说，
正如文章所述，很多事情都依赖于这个时间同步，所以我们尽最大努力使它尽可能保持同步。根据我的经验，没有什么可以做的，以减少可能的偏移。 

The document you found is the best information we have available for the time sync in Azure. I am not aware of a way to decrease the possible offset to less than 1ms. The time sync is handled by the platform which you have no control over. That being said, as the article states many things depend on this time sync so we do our best to keep it as in sync to the best of our ability. In my experience there is nothing more that can be done to decrease the possible offset. 

根据更糟糕的情况，我会指出你的概述部分

As per worse case scenario, I would point you to the Overview section

https://docs.microsoft.com/en -us / azure / virtual-machines / windows / time-sync＃overview

虚拟机与主机的交互也会影响时钟。在  期间内存
保存维护 ，虚拟机暂停最多30秒。例如，在维护开始之前，VM时钟显示10:00:00 AM
并持续28秒。 VM恢复后，VM上的时钟仍将显示上午10:00:00，这将是28秒关闭。为了解决这个问题，VMICTimeSync服务监视主机上发生的情况，并提示在VM上发生更改，以
补偿。

在此更新期间，每个应用程序的行为都不同。从客户的角度来看，这些更新发生了，用户永远不会有任何想法。它们发生得非常快，并且不会中断VM上运行的服务。平台
将更正暂停的时间，但在使用GPS时这可能是一件有趣的事情。 

Each application would act differently during this update. From a customer perspective, these updates happen and the users never have any idea. They happen very quickly and without disruption of the services running on the VM. The platform will correct the time it was paused for but that could be an interesting thing to have when working with GPS. 

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