blocks|key|2691115|text|如果您阅读医生们，psutil.cpu_percent将：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2691116|返回一个浮点，表示当前系统范围内CPU利用率的百分比…。当间隔为0.0或None时，比较上次调用或模块导入后运行的系统CPU时间，立即返回…|blockquote|2691117|我很确定这不是你想要的。|2691118|首先，如果您想知道特定调用期间的CPU使用情况，您必须(a)在函数之前和之后调用它，或者(b)从与调用并行运行的另一个线程或进程调用它，并同时调用(通过传递一个interval)。|2691119|第二，如果你想知道调用所用的CPU时间，而不是你的计算机上的每一个程序所使用的CPU时间，那么你甚至没有调用正确的函数，所以没有办法让它做你想做的事情。|2691120|而在psutil中，没有任何东西能够做到这一点。psutil的全部意义在于它从“外部”的角度提供有关您的系统和程序的信息。它不知道什么时候你运行了什么功能。|2691121|但是，stdlib也有这样的功能，比如resource.getrusage或cProfile模块。在不知道你想要完成什么的情况下，很难确切地告诉你该做什么，但是也许如果你读了那些链接的文档，他们会给你一些想法。|2691122|entityMap|0|LINK|mutability|MUTABLE|url|https://code.google.com/p/psutil/wiki/Documentation#CPU|1|http://docs.python.org/2/library/resource.html|2|http://docs.python.org/2/library/profile.html^0|9|I|5|3|0|0|0|0|28|8|0|0|2|6|O|6|0|J|I|12|8|J|I|1|12|8|2|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@$9|17|A|18|1|19]]|E|$]]|$1|F|3|G|5|H|7|1A|8|@]|D|@]|E|$]]|$1|I|3|J|5|6|7|1B|8|@]|D|@]|E|$]]|$1|K|3|L|5|6|7|1C|8|@$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|1F|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|1G|8|@$9|1H|A|1I|B|C]|$9|1J|A|1K|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1L|8|@$9|1M|A|1N|B|C]|$9|1O|A|1P|B|C]]|D|@$9|1Q|A|1R|1|1S]|$9|1T|A|1U|1|1V]]|E|$]]|$1|S|3|-4|5|6|7|1W|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]|10|$5|V|W|X|E|$Y|11]]|12|$5|V|W|X|E|$Y|13]]]]

If you read <a href="https://code.google.com/p/psutil/wiki/Documentation#CPU" rel="noreferrer">the docs</a>, <code>psutil.cpu_percent</code> will:

<blockquote>
 Return a float representing the current system-wide CPU utilization as a percentage… When interval is 0.0 or None compares system CPU times elapsed since last call or module import, returning immediately…
</blockquote>

I'm pretty sure that's not what you want.

First, if you want to know the CPU usage during a specific call, you have to either (a) call it before and after the function, or (b) call it from another thread or process running in parallel with the call, and for the same time as the call (by passing an <code>interval</code>).

Second, if you want to know how much CPU time that call is using, as opposed to how much that call plus everything else being done by every program on your computer are using, you're not even calling the right function, so there's no way to get it to do what you want.

And there's nothing in <code>psutil</code> that's designed to do that. The whole point of <code>psutil</code> is that it provides information about your system, and about your program from the "outside" perspective. It doesn't know anything about what functions you ran when.

However, there are things that come with the stdlib that do things like that, like <a href="http://docs.python.org/2/library/resource.html" rel="noreferrer"><code>resource.getrusage</code></a> or the <a href="http://docs.python.org/2/library/profile.html" rel="noreferrer"><code>cProfile</code></a> module. Without knowing exactly what you're trying to accomplish, it's hard to tell you exactly what to do, but maybe if you read those linked docs they'll give you some ideas.

blocks|key|924625|text|谢谢大家..。我找到了我的查询的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|924626|>>>+p+=+psutil.Process(os.getpid())
>>>+#+blocking
>>>+p.get_cpu_percent(interval=1)
2.0
>>>+#+non-blocking+(percentage+since+last+call)
>>>+p.get_cpu_percent(interval=0)
2.9|code-block|syntax|javascript|924627|在这里，区间值非常重要。最后的调用将给出cpu在实际函数调用中所占的百分比。|924628|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Thanks all...
I got the solution for my query.

<pre><code>&gt;&gt;&gt; p = psutil.Process(os.getpid())
&gt;&gt;&gt; # blocking
&gt;&gt;&gt; p.get_cpu_percent(interval=1)
2.0
&gt;&gt;&gt; # non-blocking (percentage since last call)
&gt;&gt;&gt; p.get_cpu_percent(interval=0)
2.9
</code></pre>

Here the interval value matters a lot. The final call will give the usage of cpu in percentage for my actual function call.

blocks|key|2691162|text|os.getpid+-这将返回运行此代码的程序的PID。例如，当您在pythonw.exe上运行它时，它将返回pythonw.exe的PID。因此，p.get_cpu_percent将返回该进程的CPU使用率。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2691163|如果您想要系统宽的CPU，psutil.cpu_percent可以完成这项工作。|2691164|希望这有帮助，干杯！|2691165|entityMap^0|0|9|22|H|0|D|I|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|T|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|K|$]]

<code>os.getpid</code> - this will return the PID of the program running this code. For example, when you run it on pythonw.exe, it will return PID of pythonw.exe.
Hence <code>p.get_cpu_percent</code> will return CPU usage of that process.

if you want system wide CPU, <code>psutil.cpu_percent</code> can do the job.

Hope this helps, Cheers!

blocks|key|2691186|text|你需要psutil|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2691187|pip+install+psutil|code-block|syntax|javascript|2691188|然后|2691189|import+psutil,os
p+=+psutil.Process(os.getpid())
print(p.cpu_percent())|2691190|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

you need psutil

<pre><code>pip install psutil
</code></pre>

then

<pre><code>import psutil,os
p = psutil.Process(os.getpid())
print(p.cpu_percent())
</code></pre>

How to exactly use the function get_cpu_percent()? 

My code is:

<pre><code>SDKTestSuite.DijSDK_CalculateFps(int(timeForFPS),int(index),cameraName)
cpuUsage = process.get_cpu_percent()
</code></pre>

Here I am calling a Function called <code>SDKTestSuite.DijSDK_CalculateFps()</code> and I am calling <code>get_cpu_percent()</code> to get the CPU usage of this call. I am Calling this function for different inputs, The result is sometimes the CPU usage gives <code>0.0%</code> which is not expected. 

So Am I using the <code>get_cpu_percent</code> in the correct manner? How to exactly use this <code>get_cpu_percent</code> function? Is there any interval parameters vary here? 

In the actual definition of this function it just sleeps for the given interval and compares the CPU time, but how does it calculates my functionality call here?

How to use psutil.get_cpu_percent()?

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。

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如何准确地使用函数get_cpu_percent()？我的代码是：SDKTestSuite.DijSDK_CalculateFps(int(timeForFPS),int(index),cameraName)cpuUsage = process.get_cpu_percent()这里，我调用一个名为SDKTestSui...

问如何使用psutil.get_cpu_percent()？
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