[System.Environment.TickCount][1] and the [System.Diagnostics.Stopwatch][2] class are two that work well for finer resolution and straightforward usage.

See Also:

 - [Is DateTime.Now the best way to measure a function’s performance?][3]
 - [High resolution timer in .NET][4]
 - [Environment.TickCount vs DateTime.Now][5]
 - [What’s the best way to benchmark programs in Windows?][6]


  [1]: http://msdn.microsoft.com/en-us/library/system.environment.tickcount.aspx
  [2]: http://msdn.microsoft.com/en-us/library/system.diagnostics.stopwatch.aspx
  [3]: https://stackoverflow.com/questions/28637/is-datetimenow-the-best-way-to-measure-a-functions-performance
  [4]: https://stackoverflow.com/questions/163022/high-resolution-timer-in-net
  [5]: https://stackoverflow.com/questions/243351/environmenttickcount-vs-datetimenow
  [6]: https://stackoverflow.com/questions/145103/whats-the-best-way-to-benchmark-programs-in-windows

I would definitely advise you to have a look at `System.Diagnostics.Stopwatch`

And when I looked around for more about Stopwatch I found this site;

[Beware of the stopwatch][1]

There mentioned another possibility 

&gt; Process.TotalProcessorTime


  [1]: http://kristofverbiest.blogspot.com/2008/10/beware-of-stopwatch.html

**Use a Profiler**

Your approach will work nevertheless, but if you are looking for more sophisticated approaches. I&#39;d suggest using a [C# Profiler][1]. 

The advantages they have is:

  - You can even get a statement level
    breakup
  - No changes required in your codebase
  - Instrumentions generally have very less overhead, hence very accurate results can be obtained.

There are many available [open-source][2] as well.


  [1]: http://dotnet.jku.at/projects/Prof-It/
  [2]: http://csharp-source.net/open-source/profilers

Tickcount is good, however i suggest running it 100 or 1000 times, and calculating an average. 
Not only makes it more measurable - in case of really fast/short functions, but helps dealing with some one-off effects caused by the overhead.

Which types of classes can use `foreach` loops?


How do foreach loops work in C#?

How do I ping a website or IP address with Python?

Ping a site in Python?

Obviously I can do  and `DateTime.Now.After` - `DateTime.Now.Before` but there must be something more sophisticated.

Any tips appreciated.

What is the best way to measure execution time of a function?

<p>Obviously I can do  and <code>DateTime.Now.After</code> - <code>DateTime.Now.Before</code> but there must be something more sophisticated.</p>
<p>Any tips appreciated.</p>


I&#39;m trying to write out a  `Byte[]` array representing a complete file to a file.

The original file from the client is sent via TCP and then received by a server. The received stream is read to a byte array and then sent to be processed by this class. 

This is mainly to ensure that the receiving `TCPClient` is ready for the next stream and separate the receiving end from the processing end. 

The `FileStream` class does not take a byte array as an argument or another Stream object ( which does allow you to write bytes to it).

I&#39;m aiming to get the processing done by a different thread from the original ( the one with the TCPClient). 

I don&#39;t know how to implement this, what should I try?

Can a Byte[] Array be written to a file in C#?

The built-in `Math.Pow()` function in .NET raises a `double` base to a `double` exponent and returns a `double` result.

What&#39;s the best way to do the same with integers?

Added: It seems that one can just cast `Math.Pow()` result to (int), but will this always produce the correct number and no rounding errors?



How do you do *integer* exponentiation in C#?

There are times when I want to test new code from the forums or when I need to help my friends with specific C# problem. The problem is I don&#39;t want to create new &quot;project&quot; in Visual Studio each time just to code/run only this small code.

Java &amp; Eclipse IDE comes up with &quot;Scrapbook&quot; feature which allows the execution of arbitrary Java expressions. What are the choices for C# programmers?

How to quickly code and run small C# code

I&#39;m doing some research in code generation from xsd schema files. 
My requirements:

  - Must generate C# 2.0 code (or above), using generic collections where needed.
  - Must generate comments from the xsd comments
  - Must generate fully serializable code.
  - Should be able to generate resuable basetypes when generating from multiple xsd&#39;s with the same includes.


(see also my other questions: [How can I generate multiple classes from xsd’s with common includes?][1] and [How can I generate comments from xs:documentation tags in a wsdl?][2]

I have found the following options:

 1. Use xsd.exe (supplied with the SDK and Visual Studio)
 2. XSDCodeGen from [Daniel Cazzulino][3] 
 3. [Xsd2Code][4]
 4. [CodeXS][5]
 5. [XsdObjectGen][6] by Microsoft
 6. [XSDClassGen][7] (Seems to be missing in action)

Did I miss any? Because (1), (2) and (5) do not generate 2.0 code, and I have problems with serializing code from (3). What do you use when generating code?


  [1]: https://stackoverflow.com/questions/374600/how-can-i-generate-multiple-classes-from-xsds-with-common-includes
  [2]: https://stackoverflow.com/questions/374086/how-can-i-generate-comments-from-xsdocumentation-tags-in-a-wsdl
  [3]: http://www.clariusconsulting.net/blogs/kzu/archive/2004/05/14/XsdCodeGenTool.aspx
  [4]: http://www.codeplex.com/Xsd2Code
  [5]: http://www.bware.biz/CodeXS/
  [6]: http://www.microsoft.com/downloads/details.aspx?familyid=89e6b1e5-f66c-4a4d-933b-46222bb01eb0&amp;displaylang=en
  [7]: http://www.dotnetjunkies.com/WebLog/ram-marappan/default.aspx

Comparison of XSD Code Generators

I have a ticks value of 28000000000 which should be 480 minutes but how can I be sure? How do I convert a ticks value to minutes?

How do I convert ticks to minutes?

I am looking for some large public datasets, in particular:

1. Large sample web server logs that have been anonymized.

2. Datasets used for database performance benchmarking.

Any other links to large public datasets would be appreciated.  I already know about Amazon&#39;s public datasets at:  http://aws.amazon.com/publicdatasets/



Large public datasets?

If I had a million images, would it be better to store them in some folder/sub-folder hierarchy or just dump them all straight into a bucket (without any folders)?

Would dumping all the images into a hierarchy-less bucket slow down LIST operations?

Is there a significant overhead in creating folders and sub folders on the fly and setting up their ACLs (programatically speaking)?

Max files per directory in S3

I have always wondered if, in general, declaring a throw-away variable before a loop, as opposed to repeatedly inside the loop, makes any (performance) difference? 
A *(quite pointless)* example in Java:

**a)** declaration before loop:

    double intermediateResult;
    for(int i=0; i &lt; 1000; i++){
        intermediateResult = i;
        System.out.println(intermediateResult);
    }

**b)** declaration (repeatedly) inside loop:
    
    for(int i=0; i &lt; 1000; i++){
        double intermediateResult = i;
        System.out.println(intermediateResult);
    }


Which one is better, **a** or **b**? 

I suspect that repeated variable declaration (example **b**) creates more overhead *in theory*, but that compilers are smart enough so that it doesn&#39;t matter. Example **b** has the advantage of being more compact and limiting the scope of the variable to where it is used. Still, I tend to code according example **a**.

***Edit:*** I am especially interested in the Java case.

Difference between declaring variables before or in loop?

I&#39;ve been profiling an application all day long and, having optimized a couple bits of code, I&#39;m left with this on my todo list. It&#39;s the activation function for a neural network, which gets called over a 100 million times. According to dotTrace, it amounts to about 60% of the overall function time.

How would you optimize this?

    public static float Sigmoid(double value) {
        return (float) (1.0 / (1.0 + Math.Pow(Math.E, -value)));
    }



Math optimization in C#

I did some timing tests and also read some articles like [this one][1] (last comment), and it looks like in Release build, float and double values take the same amount of processing time.

How is this possible? When float is less precise and smaller compared to double values, how can the CLR get doubles into the same processing time?

  [1]: http://www.cincomsmalltalk.com/userblogs/buck/blogView?showComments=true&amp;title=Smalltalk+performance+vs.+C%23&amp;entry=3354595110#3354595110



Float vs Double Performance

Does anyone ever use stopwatch benchmarking, or should a performance tool always be used?  Are there any good free tools available for Java?  What tools do you use?

To clarify my concerns, stopwatch benchmarking is subject to error due to operating system scheduling.  On a given run of your program the OS might schedule another process (or several) in the middle of the function you&#39;re timing.  In Java, things are even a little bit worse if you&#39;re trying to time a threaded application, as the JVM scheduler throws even a little bit more randomness into the mix.

How do you address operating system scheduling when benchmarking?

Is stopwatch benchmarking acceptable?

To what extent does Google Analytics impact performance?

I&#39;m looking for the following:

 - Benchmarks (including response times/pageload times et al)
 - Links or results to similar benchmarks

One (possible) method of testing Google Analytics (GA) on your site:

1.  Serve ga.js (the Google Analytics JavaScript file) from your own server.
2.  Update from Google Daily (test 1) and Weekly (test 2).

I would be interested to see how this reduces the communication between the client webserver and the GA server.

Has anyone conducted any of these tests? If so, can you provide your results? If not, does anyone have a better method for testing the performance hit (or lack thereof) for using GA?

Does Google Analytics have performance overhead?

I&#39;m doing some real quick and dirty benchmarking on a single line of C# code using DateTime:

    long lStart = DateTime.Now.Ticks;
    // do something
    long lFinish = DateTime.Now.Ticks;

The problem is in the results:

&lt;pre&gt;
Start Time [633679466564559902]
Finish Time [633679466564559902]

Start Time [633679466564569917]
Finish Time [633679466564569917]

Start Time [633679466564579932]
Finish Time [633679466564579932]
&lt;/pre&gt;

...and so on.

Given that the start and finish times are identical, Ticks is obviously not granular enough.

So, how can I better measure performance?

How to measure code performance in .NET?

How do you write (and run) a correct micro-benchmark in Java?

I&#39;m looking for some code samples and comments illustrating various things to think about.

Example: Should the benchmark measure time/iteration or iterations/time, and why?

Related: https://stackoverflow.com/questions/410437/is-stopwatch-benchmarking-acceptable

How do I write a correct micro-benchmark in Java?

When I try to execute (some) queries in phpMyadmin I get this error

&gt; Fatal error: Maximum execution time of 60 seconds exceeded in
&gt; C:\xampp\phpmyadmin\libraries\dbi\mysql.dbi.lib.php on line 140

because I have a very large table (over 9 millions records)

I have edited the file C:\xampp\php\php.ini 

and changed the value of &quot;max execution time&quot; from 60 to 1000 then restarts the PHP and still have the same error.

Any solution?




Maximum execution time in phpMyadmin

I have a command line program in Python that takes a while to finish. I want to know the exact time it takes to finish running.

I&#39;ve looked at the `timeit` module, but it seems it&#39;s only for small snippets of code. I want to time the whole program.


How do I get time of a Python program&#39;s execution?

I have the following code in a python script:

    def fun(): 
      #Code here
     
    fun()

I want to execute this script and also find out how much time it took to execute in minutes. How do I find out how much time it took for this script to execute ? An example would be really appreciated.

Find out time it took for a python script to complete execution

I want to increase *maximum execution time* in php , not by changing `php.ini` file. 

I want to Increase it from my php file.

Is this possible?

How to increase maximum execution time in php

Is it possible to have a loop which has a zero execution time? I would think that even an empty loop should have an execution time since there is an overhead associated with it. 

Content Type	Original Author	Original Content on Stackoverflow
Question	Ian G	View Question on Stackoverflow
Solution 1 - C#	ctacke	View Answer on Stackoverflow
Solution 2 - C#	tafa	View Answer on Stackoverflow
Solution 3 - C#	M.N	View Answer on Stackoverflow
Solution 4 - C#	FooLman	View Answer on Stackoverflow

What is the best way to measure execution time of a function?

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

Solution 4 - C#

Ping a site in Python?

How do foreach loops work in C#?

Attributions