blocks|key|728521|text|它们与任何度量都是相同的。请参阅维基百科的这篇文章了解更多细节--|type|unstyled|depth|inlineStyleRanges|entityRanges|data|728522|http://en.wikipedia.org/wiki/Accuracy_and_precision|offset|length|728523|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1F|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

They are the same as with any measurement. See this Wikipedia article for more details --

<a href="http://en.wikipedia.org/wiki/Accuracy_and_precision" rel="nofollow">http://en.wikipedia.org/wiki/Accuracy_and_precision</a>

blocks|key|728538|text|在.net中有不同类型的时间(如果我没记错的话，有3到4个)，每个时间都使用自己的算法。计时器的精度意味着它在通知正在使用的应用程序计时事件时的精确度。例如，如果您使用计时器并将其设置为每1000毫秒触发一次滴答事件，则计时器的精度意味着它将实际滴答地接近指定的1000毫秒。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|728539|有关更多信息(至少在c#中)，我建议您阅读the+msdn+page+on+timers|offset|length|728540|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/magazine/cc164015.aspx^0|0|L|N|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

There are different types of times in .net (3 or 4 of them, if i remember correctly), each working with his own algorithm. The precision of timer means how accurate it is in informing the using application on the ticking events. For example, if you use a timer and set it to trigger its ticking event every 1000 ms, the precision of the timer means how close to the specified 1000 ms it will actually tick.
 
for more information (at least in c#), i suggest u read <a href="http://msdn.microsoft.com/en-us/magazine/cc164015.aspx" rel="nofollow">the msdn page on timers</a>:

blocks|key|728558|text|精确度和精确度是对立的目标，你不能两者兼得。一个非常精确的定时源的例子是DateTime.UtcNow。它提供由内核自动校正时钟频率误差的绝对时间，使用计时服务定期重新校准时钟。你可能听说过time.windows.com，大多数Windows+PC使用的NTP服务器。非常准确，你可以指望在整个一年中误差不到一秒。但不是很精确，该值每秒仅更新64次。对任何不到一秒的事情进行精确计时都是没有用的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|728559|秒表的时钟源非常不同。它使用由芯片组中某处可用的频率源驱动的自由运行计数器。这曾经是在color+burst+frequency+(3.579545+MHz)上运行的专用水晶，但无情的成本削减已经消除了大多数PC的这一点。秒表非常精确，你可以从它的频率属性中看出来。你应该得到一个介于兆赫和cpu时钟频率之间的东西，让你的时间降到一微秒或更好。但它是不准确的，它受到电子零件公差的限制。特别是不信任任何超过千兆赫的频率，这是从乘法器得出的，乘法器也会使误差成倍增加。注意海森伯格原理，秒表的启动和停止需要非零的开销，这将影响非常短的测量的准确性。秒表的另一个常见的准确性问题是操作系统将你的线程切换出来，以允许其他代码运行。您需要采集多个样本并使用中位数。|offset|length|728560|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Color_burst^0|0|17|L|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

Accuracy and precision are opposing goals, you can't get both. An example of a very accurate timing source is DateTime.UtcNow. It provides absolute time that's automatically corrected for clock rate errors by the kernel, using a timing service to periodically re-calibrate the clock. You probably heard of time.windows.com, the NTP server that most Windows PC use. Very accurate, you can count on less than a second of error over an entire year. But not precise, the value only updates 64 times per second. It is useless to time anything that takes less than a second with any kind of decent precision.

The clock source for Stopwatch is very different. It uses a free running counter that is driven by a frequency source available somewhere in the chipset. This used to be a dedicate crystal running at the <a href="http://en.wikipedia.org/wiki/Color_burst" rel="nofollow">color burst frequency</a> (3.579545 MHz) but relentless cost cutting has eliminated that from most PCs. Stopwatch is very precise, you can tell from its Frequency property. You should get something between a megahertz and the cpu clock frequency, allowing you to time down to a microsecond or better. But it is not accurate, it is subject to electronic part tolerances. Particularly mistrust any Frequency beyond a gigahertz, that's derived from a multiplier which also multiplies the error. And beware the Heisenberg principle, starting and stopping the Stopwatch takes non-zero overhead that will affect the accuracy of very short measurements. Another common accuracy problem with Stopwatch is the operating system switching out your thread to allow other code to run. You need to take multiple samples and use the median value.

blocks|key|4050735|text|来自MSDN+Stopwatch+Class：(强调我的)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4050736|“秒表通过对基础计时器机制中的计时器节拍进行计数来测量已用时间。如果安装的硬件和操作系统支持高分辨率性能计数器，则秒表类使用该计数器来测量已用时间。否则，秒表类使用系统计时器来测量已用时间。使用频率和IsHighResolution字段来确定秒表计时实现的精度和分辨率。”|style|BOLD|4050737|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.diagnostics.stopwatch.aspx^0|7|F|0|0|2N|S|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@$A|U|B|V|F|G]]|9|@]|C|$]]|$1|H|3|-4|5|6|7|W|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]]]

From MSDN <a href="http://msdn.microsoft.com/en-us/library/system.diagnostics.stopwatch.aspx" rel="nofollow">Stopwatch Class</a>: (emphasis mine)

"The Stopwatch measures elapsed time by counting timer ticks in the underlying timer mechanism. If the installed hardware and operating system support a high-resolution performance counter, then the Stopwatch class uses that counter to measure elapsed time. Otherwise, the Stopwatch class uses the system timer to measure elapsed time. Use the Frequency and IsHighResolution fields to determine the precision and resolution of the Stopwatch timing implementation."

I don't understand the meaning of timer precision and resolution. Can anyone explain it to me?

NOTE: This question is related to Stopwatch.

What is the meaning of timer precision and resolution?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

我不明白计时器精度和分辨率的含义。有人能给我解释一下吗？注:此问题与秒表相关。

问计时器精度和分辨率的含义是什么？
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问计时器精度和分辨率的含义是什么？EN