Actually, it&#39;s just that htop by default shows each thread as a separate process.  You can add the line `hide_userland_threads=1` to your `~/.config/htop/htoprc` file to show only one line.

See https://unix.stackexchange.com/questions/10362/why-does-htop-show-more-process-than-ps

I tried to investigate the jQuery code, so I used this:

    document.write($.constructor);
[jsfiddle][1]    

I got this result:

    function Function() { [native code] }
What does `[native code]` mean? Why can&#39;t I see the real code?

&lt;sub&gt; Tested with `Google-Chrome` &lt;/sub&gt;


  [1]: http://jsfiddle.net/WZGWp/

What does &quot; [native code] &quot; mean?

I have a Jekyll blog and I want to use MathJax with it, in the sense that I want to be able to type something like

    $$\sum_{n=1}^\infty 1/n^2 = \frac{\pi^2}{6}$$

in my markdown files, and have the correct LaTeX expression generated with MathJax, in a similar way to how it is done at [math.stackexchange](https://gist.github.com/2912921).

What is the easiest way to do this? Currently I have the file [jsmath.js](https://gist.github.com/2912921) (GitHub gist) in my directory, and I thought I could have a simple file named `mathjs` in my `_includes` directory with the line

    &lt;script src=&quot;path/to/jsmath.js&gt;&lt;/script&gt;

and include that in each post via

    {% include mathjs %}

but this doesn&#39;t seem to work - when I run `jekyll --server` the page is generated, but none of the content is visible.

Am I going about this the right way? Is there a better way to use MathJax with Jekyll?

Using MathJax with Jekyll

Htop on my linux machine shows many &quot;processes&quot; after launching one java program/JVM. I do understand that the JVM runs multiple
threads (for the actual program, for garbage collection, etc). 

But how come htop lists them as multiple processes with different pids. What exactly are those processes?

Htop showing multiple java processes with different pids

<p>Htop on my linux machine shows many "processes" after launching one java program/JVM. I do understand that the JVM runs multiple
threads (for the actual program, for garbage collection, etc).</p>
<p>But how come htop lists them as multiple processes with different pids. What exactly are those processes?</p>


I am done with the project which connects to database (MySQL). Now I want to export the project as jar. But I don&#39;t know how to include its external dependencies? Is there any way of doing it in Eclipse or should I use any scripts for that?.

How to create a jar with external libraries included in Eclipse?

I am trying to run a .jar file that was created successfully in Netbeans and I am receiving the following error:

&gt; Error occurred during initialization of VM java.lang.Error: 
&gt; Properties init: Could not determine current working directory. at 
&gt; java.lang.System.initProperties(Native Method) at 
&gt; java.lang.System.initializeSystemClass(System.java:1070) 

The command that I type to run the .jar is 

    java -jar &quot;/path to the dist forlder/EOPPrototype.jar&quot;

My classpath is as follows:

    CLASSPATH=/opt/netbeans-7.1.2/ide/modules/ext/mysql-connector-java-5.1.13-     bin.jar:/h/USERS/local/pagola/NetBeansProjects/mylib/dist/mylib.jar:/h/USERS/local/pagola/NetBeansProjects/EOPPrototype/build/classes:.

What am i missing?


Cannot determine current directory

When declaring any primitive type data like `int` or `double` they get initialized to `0` or `0.0`. Why can we not set them to `null`?

Why can&#39;t primitive data types be &quot;null&quot; in Java?

Previously, I had my LegNo enums defined simply as: 

    NO_LEG, LEG_ONE, LEG_TWO

and by calling `return LegNo.values()[i];`, I was able to get the value associated with each enum. 

But now I&#39;ve decided I want the `LegNo` enum `NO_LEG` to be the int -1 instead of 0
so I decided to use a private constructor to initialise and set its int value

    NO_LEG(-1), LEG_ONE(1), LEG_TWO(2);

    private LegNo(final int leg) { legNo = leg; }

the only thing now is that because I&#39;m doing it this way the `values()` method will not work for the `NO_LEG` enum. How do I get the enum associated with the int? Is there any efficient way of doing this other than using a case switch statement or an if-elseif-elseif

I can see a lot of SO questions to do with getting the int value from the enum, but I&#39;m after the reverse. 


Getting enum associated with int value

What should I prefer when updating the database? What are the pros &amp; cons with either method and when shall I use the one or the other?

    public void disemployEmployee(Integer employeeId, Date endDate) {
        Employee employee = (Employee)em.find(&quot;Employee&quot;, employeeId);
        employee.getPeriod().setEndDate(endDate);
        em.flush();
    }

    public void disemployEmployee(Integer employeeId, Date endDate) {
        Employee employee = (Employee)em.find(&quot;Employee&quot;, employeeId);
        em.getTransaction().begin();
        employee.getPeriod().setEndDate(endDate);
        em.getTransaction().commit();
    }

Entitymanager.flush() VS EntityManager.getTransaction().commit - What should I prefer?

I am writing a script to monitor the CPU and MEM of any given process. For that i need to send in the name of the process to be monitored as a commandline argument. For example. 

    ./monitorscript &lt;pname&gt;

I need to get the pid of the process in the script so that i can use a `ps -p &lt;pid&gt;` inside. 

How do i get the pid of a process given its process name? 

I understand that there might be multiple processes in the same name. I just want to get the first process out of that list. 



How to get the PID of a process by giving the process name in Mac OS X ?

I&#39;m trying to capture process output in &quot;realtime&quot; (while it&#39;s running). The code I use is rather simple (see below). For some strange reason the OutputDataReceived event is never called. Why?

    private void button2_Click(object sender, EventArgs e)
        {
          // Setup the process start info
          var processStartInfo = new ProcessStartInfo(&quot;ping.exe&quot;, &quot;-t -n 3 192.168.100.1&quot;)
          {
            UseShellExecute = false,
            RedirectStandardOutput = true
          };
    
          // Setup the process
          mProcess = new Process { StartInfo = processStartInfo, EnableRaisingEvents = true };
    
          // Register event
          mProcess.OutputDataReceived += OnOutputDataReceived;
    
          // Start process
          mProcess.Start();
          mProcess.WaitForExit();
        }
    
        void OnOutputDataReceived(object sender, DataReceivedEventArgs e)
        {
           //Never gets called...
        }

Capturing process output via OutputDataReceived event

How can I pipe the stdout of multiple commands to a single command?  

Example 1: combine and sort the output of all three echo commands:

    echo zzz; echo aaa; echo kkk
desired output:

    aaa
    kkk
    zzz


Example 2: rewrite the following so that all the commands are in a single command-line using pipes, without redirects to a temp file:

    setopt &gt; /tmp/foo; unsetopt &gt;&gt; /tmp/foo; set &gt;&gt; /tmp/foo; sort /tmp/foo

Pipe multiple commands into a single command

    top -c

Top lists all the processes, there are good options to filter the processes by username by using the option -u &lt;username&gt; but I am wondering if there is any easy way to filter the processes based on processname listed under COMMAND column of the top output.

For Example I would want like top -some option -substring of processname and top displays pids only having this substring in its command name


top -c command in linux to filter processes listed based on processname

When I start up an Experimental instance of VS from VS for debugging and stop debugging (sometimes directly from the parent VS), a zombile devenv.exe process remains running which I am unable to kill. It holds on to many of my dlls.

As I am logged onto this 64bit Win7 machine as Administrator, I would expect to be able to kill any process I wish to.

    I tried (from Administrator command prompt):
    
    End Task from Task Manager.
    TASKKILL /F /IM devenv.exe
    PSKILL devenv.exe

None return any error and `TASKKILL` and `PSKILL` returned success messages of terminating/killing the process. But devenv.exe still runs, it is not re-spawned as the `PID` remains constant. It goes away only on restart of the system which is not a great solution.

Note. LockHunter shows devenv has got a lock on itself. And it cannot unlock it.

![Process Monitor shows devenv to be in some kind of &#39;Process Profiling&#39; loop][1]

The above screenshot is the output of Process Monitor showing devenv to be in some kind of &#39;Process Profiling&#39; loop (Right click on it and click open image in new tab to see it properly).

Any ideas how to kill such a process on Windows?


  [1]: http://i.stack.imgur.com/Jd77o.png

Taskkill /f doesn&#39;t kill a process

What does the HotSpot JVM flag `-XX:+UseCompressedOops` do and when should I use it? What sort of performance and memory-usage differences will I see when using it on a 64-bit Java instance (vs. not using it)? 

What does the UseCompressedOops JVM flag do and when should I use it?

I was trying to find out the difference between Apache Tomcat variables - `CATALINA_OPTS` and `JAVA_OPTS` in [SO][1] and surprised to see that there is no question/answer posted here yet.  So I thought of sharing it here (with answer) after finding out the difference.  Check the answer/difference below.

**NOTE:** At the time of this posting, we&#39;re running Apache Tomcat v6.0.10 with JDK 6u32 on CentOS5 64-bit arch.

  [1]: http://stackoverflow.com &quot;StackOverflow&quot;

CATALINA_OPTS vs JAVA_OPTS - What is the difference?

In a Java thread dump, you can see locks mentioned within stack traces.  
There seems to be three kinds of information:

1:

    - locked &lt;0x00002aab329f7fa0&gt; (a java.io.BufferedInputStream)

2:

    - waiting to lock &lt;0x00002aaaf4ff6fa0&gt; (a org.alfresco.repo.lock.LockServiceImpl)

3:

    - parking to wait for  &lt;0x00002aaafbf70bb8&gt; (a java.util.concurrent.SynchronousQueue$TransferStack)

* 1: The thread has obtained a lock on object 0x00002aab329f7fa0.
* 2&amp;3: Seem to say that the thread is waiting for the lock on said object to become available...  
but what is the difference 2 and 3?

Java thread dump: Difference between &quot;waiting to lock&quot; and &quot;parking to wait for&quot;?

I have this VM with tomcat, java, and grails in it. I&#39;ve been getting permgen errors so I looked around and found the solution:

    set JAVA_OPTS=&quot;-Xms256m -Xmx1024m -XX:PermSize=512m -XX:MaxPermSize=512m&quot;

I use SSH to access the vm and type the arguments above. I suppose that would fix the problem. Thing is, I wanted to make sure that I did it correctly. So I searched again on how I could check the current permSize and this is the solution I got:

    jinfo -flag MaxPermSize 6444

6444 is the pid, and as a response, I got this.

    -XX:MaxPermSize=85983232

Question: Is the value of the maxPermSize in bytes? because, if it is, then that would mean that the java_opts command didn&#39;t work. I am expecting to get 512m but 85983232 bytes = 82 mb.. Or am I seeing it wrong..? Can anybody enlighten me on this? D:

How do I properly set the permgen size?

We have multiple servers in our lab and I tried to determine which one has more resources currently available. I tried to interpret the information htop displays but I&#39;m not 100% understanding all those numbers. 

I have taken a screen shot for each server after issuing htop:


Server #1:

![][1]

Server #2: 

![][2] 

Does server #1 have more memory available than server #2? Should I look at Avg or Mem? Or what other parameter should I look at?

Thanks!


 [1]:http://i.imgur.com/zIEqjOj.jpg
 [2]:http://i.imgur.com/vjEcyzA.jpg

How do I interpret the memory usage information from htop

I would like to quickly find if my process is running by searching its name in htop. I could only find the PID or list all process one by one which not convenient. 

Content Type	Original Author	Original Content on Stackoverflow
Question	b.buchhold	View Question on Stackoverflow
Solution 1 - Java	Jer	View Answer on Stackoverflow

Htop showing multiple java processes with different pids

Java Problem Overview

Java Solutions

Solution 1 - Java

Using MathJax with Jekyll

What does " [native code] " mean?

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