In the run configuration you want to customize (just click on it) open the tab `Arguments` and add `-Xmx2048m`in the VM arguments section.
You might want to set the `-Xms` as well (small heap size). 

1. Go to Eclipse Folder
2. Find Eclipse Icon in Eclipse Folder
3. Right Click on it you will get option &quot;Show Package Content&quot;
4. Contents folder will open on screen
5. If you are on Mac then you&#39;ll find &quot;MacOS&quot;
6. Open MacOS folder you&#39;ll find eclipse.ini file
7. Open it in word or any file editor for edit

    ...

        -XX:MaxPermSize=256m
    
        -Xms40m
    
        -Xmx512m
    ...

8. Replace -Xms512m to -Xmx1024m
9. Save the file and restart your Eclipse
10. Have a Nice time :)   

Find the Run button present on the top of the Eclipse,
then select Run Configuration -&gt;
Arguments, in VM arguments section just mention the heap size you want to extend as below:

    -Xmx1024m



In Eclipse Folder there is eclipse.ini file.  Increase size  `-Xms512m
-Xmx1024m`

Open `eclipse.ini` 

Search for `-Xmx512m` or maybe more size it is.

Just change it to a required size such as I changed it to `-Xmx1024m`  



While using the `ActionBarSherlock` in xml at:

    &lt;item name=&quot;android:actionBarStyle&quot;&gt;@style/Widget.Styled.ActionBar&lt;/item&gt;

I got this error:

    android:actionBarStyle requires API level 11 (current min is 8) error

I&#39;m using it for back porting my app with actionbar to 2.2 devices.


How to use them both together:

     &lt;item name=&quot;actionBarStyle&quot;&gt;@style/Widget.Styled.ActionBar&lt;/item&gt;
     &lt;item name=&quot;android:actionBarStyle&quot;&gt;@style/Widget.Styled.ActionBar&lt;/item&gt;


android:actionBarStyle requires API level 11

In a directory I have a lot of files, named more or less like this:

    001_MN_DX_1_M_32
    001_MN_SX_1_M_33
    012_BC_2_F_23
    ...
    ...

In Python, I have to write a code that selects from the directory a file starting with a certain string. For example, if the string is `001_MN_DX`, Python selects the first file, and so on.

How can I do it?

Choose a file starting with a given string

Some say I need to do that in Run Configurations for my application. When I open that window, could you please tell me how to set the right argument and the amount of memory? Say how to set 2GB or 1.5GB?

How to increase application heap size in Eclipse?

<p>Some say I need to do that in Run Configurations for my application. When I open that window, could you please tell me how to set the right argument and the amount of memory? Say how to set 2GB or 1.5GB?</p>


Whenever I start up Eclipse Juno, it gives me an error saying:

&gt; An error had occured. Please see the log file:
&gt;
&gt; C:\Program Files\eclipse\configuration\1362989254411.log.

Some websites say to uninstall jdk and install it back again. I did that, but it didn&#39;t work. I think it was because on their website, the error is happening IN the workspace. Mine is on the program files folder, which is in the computer.

It happened after updating it. Should I downgrade. If so, how? If I can&#39;t downgrade, what should I do?

An error has occured. Please see log file - eclipse juno

Eclipse will not start and I haven&#39;t changed anything

I cannot add my project to a server in Eclipse - why is that?

I installed all necessary tools (Web Dev, Java EE, Server Adapters, and Tomcat itself, everything)

I configured the runtime environments, adjusted all Java Versions to JDK 6 (because it should run on Tomcat 6), but still the left side of the dialogue where I could add resources is empty when creating a new server.

What else could I try?

PS: I am using [Eclipse v4.2][1] (Juno) on Windows&amp;nbsp;7 Professional.

  [1]: https://en.wikipedia.org/wiki/Eclipse_%28software%29#Releases




Cannot add a project to a Tomcat server in Eclipse

my Eclipse Juno SR1 somehow got screwed up. It seems I have a new area, and if I interpret it correctly, it is called the &quot;Shared Area&quot; (only from a tooltip). I cannot get rid of it by conventional means (i.E. closing/hiding). All files I open now are opened in this shared area, not in the area my files were opened before. The area is distinct from the normal editing area in that it will not go to the same place (top right, under the menus).

The area has only maximize and minimize buttons. Maximizing it will maximize it over everything, this would be expected. Minimizing it actually hides it, but opening an existing file will bring it back as kind of a popup over the eclipse file list.

I do not seem to find how I activated this feature, and I cannot seem to find any activation instructions in the Eclipse help (the help looking for &quot;shared&quot; and &quot;area&quot; separately doesn&#39;t really help anyway).

I just want this feature/window/perspective to go away and let me open files like I used to. Any tips?

Edit: Maybe this area is not called &quot;Shared area&quot;, this could be wrong. If not, it doesn&#39;t seem to have any name. It just forces all editors opening new files to open in it, and not in the area that they usually open in. The way I determined it was called &quot;Shared area&quot; is by minimizing it, then opening a file. It opens as kind of a popup (described above), and there&#39;s a menu bar attached with 2 icons, &quot;Restore&quot; and &quot;Shared area&quot;, which is pre-selected.

This is the are &quot;docked&quot; to the right:
![enter image description here][1]

This is the area docked below:
![enter image description here][2]

The area is not dockable in the way that it docks to certain areas of Eclipse, but stretches (when dragged) over the whole Eclipse Window and even outside of it.


  [1]: http://i.stack.imgur.com/cy5pF.png
  [2]: http://i.stack.imgur.com/tFlV5.png

Files get opened in wrong editing area

&gt;Server Tomcat v7.0 Server at localhost was unable to start within 101 seconds. If the server requires more time, try increasing the timeout in the server editor. 

This is my error. I searched a lot but I can&#39;t able to find a solution for this please help me someone I changed time from 45 secs to 101 secs still not solved, I removed eclipse and tomcat and I re-installed again but same problem occurs, plz give some solution. 






Tomcat Server not starting with in 45 seconds

Java 8 introduces important new language features such as lambda expressions.

Are these changes in the language accompanied by such significant changes in the compiled bytecode that would prevent it from being run on a Java 7 virtual machine without using some retrotranslator?

Can Java 8 code be compiled to run on Java 7 JVM?

The compiler book(The dragon book) explains that value types are created on the stack, and reference types are created on the heap. 


For Java, JVM also contains heap and stack in runtime data area.  Objects and arrays are created on heap, method frames are pushed to stack. One heap is shared by all threads, while each thread has its own stack. The following diagram shows this: 

![enter image description here][1]

More about [Java run-time data areas][2].

What I don&#39;t understand is that since JVM is essentially a software, how are those JVM heap, stack and threads mapped to physical machine? 

I would appreciate it if someone can compare those concept between Java and C++. Because Java runs on JVM, but C++ does not. 

To make this question more precise, I want to know the following: 

 1. Comparing with Java, What does C++ run-time data area look like? A picture would be helpful, I can&#39;t find a good picture like the JVM one above. 
 2. How the JVM heap, stack, registers and threads are mapped to operating system? or I should ask how they are mapped to physical machine? 
 3. Is it true that each JVM threads is simply a user thread and gets mapped to kernal in some way? (user thread vs kernel thread)

**Update**: 
I draw a picture for runtime physical memory of a process.  
![enter image description here][3]


  [1]: http://i.stack.imgur.com/cFTf6.jpg
  [2]: http://www.programcreek.com/2013/04/jvm-run-time-data-areas/
  [3]: http://i.stack.imgur.com/xAPl5.jpg

How JVM stack, heap and threads are mapped to physical memory or operation system

I think it is because the JVM needs to move objects, is that correct?

Why does the JVM full GC need to stop-the-world?

I was wondering what happens when you try to catch an StackOverflowError and came up with the following method:

    class RandomNumberGenerator {

        static int cnt = 0;

        public static void main(String[] args) {
            try {
                main(args);
            } catch (StackOverflowError ignore) {
                System.out.println(cnt++);
            }
        }
    }

Now my question:

Why does this method print &#39;4&#39;?

I thought maybe it was because `System.out.println()` needs 3 segments on the call stack, but I don&#39;t know where the number 3 comes from. When you look at the source code (and bytecode) of `System.out.println()`, it normally would lead to far more method invocations than 3 (so 3 segments on the call stack would not be sufficient). If it&#39;s because of optimizations the Hotspot VM applies (method inlining), I wonder if the result would be different on another VM.


&lt;b&gt;Edit&lt;/b&gt;:

As the output seems to be highly JVM specific, I get the result 4 using&lt;br&gt;
Java(TM) SE Runtime Environment (build 1.6.0_41-b02)&lt;br&gt;
Java HotSpot(TM) 64-Bit Server VM (build 20.14-b01, mixed mode)

&lt;br&gt;

&lt;b&gt; Explanation why I think this question is different from https://stackoverflow.com/questions/15083318/understanding-java-stack: &lt;/b&gt;

My question is not about why there is a cnt &gt; 0 (obviously because `System.out.println()` requires stack size and throws another `StackOverflowError` before something gets printed), but why it has the particular value of 4, respectively 0,3,8,55 or something else on other systems.


Why does this method print 4?

I was wondering if it is a &quot;bad practice&quot; to use a `break` statement to exit a loop instead of fulfilling the loop condition?

I do not have enough insight in Java and the JVM to know how a loop is handled, so I was wondering if I was overlooking something critical by doing so.

The focus of this question: is there a specific performance overhead?

Is it bad practice to use break to exit a loop in Java?

I&#39;m studying computer engineering, and I have some electronics courses. I heard, from two of my professors (of these courses) that it is possible to avoid using the `free()` function (after `malloc()`, `calloc()`, etc.) because the memory spaces allocated likely won&#39;t be used again to allocate other memory. That is, for example, if you allocate 4 bytes and then release them you will have 4 bytes of space that likely won&#39;t be allocated again: you will have a *hole*.

I think that&#39;s crazy: you can&#39;t have a *not-toy-program* where you allocate memory on the heap without releasing it. But I don&#39;t have the knowledge to explain exactly why it&#39;s so important that for each `malloc()` there must be a `free()`.

So: are there ever circumstances in which it might be appropriate to use a `malloc()` without using `free()`? And if not, how can I explain this to my professors?

Is it ever OK to *not* use free() on allocated memory?

What means the column VIRT in this HTOP output? It appears in red color and bolded.

I&#39;m running an elasticsearch cluster with **4 nodes** and indexing massive data. 

- 1700 indexes with 3 shards, some with 10 small docs, others with 500k small docs
- 1 index with 3 shards with 60 million small documents

It shows green health all the time.

This is a DigitalOcean droplet with **4GB RAM and 2 CPU&#39;s**. I&#39;m setting heapsize to **2gb (-Xms and -Xmx)**.

Is this an overhead of RAM memory?


      1  [|||||                                9.4%]     Tasks: 26, 122 thr; 2 running
      2  [|||                                  4.3%]     Load average: 0.25 0.47 0.65
      Mem[||||||||||||||||||||||||||||||2592/3954MB]     Uptime: 2 days, 01:05:57
      Swp[                                    0/0MB]

      PID USER      PRI  NI  VIRT   RES   SHR S CPU% MEM%   TIME+  Command
     9629 root       20   0 16.2G 2516M 97360 S 12.0 63.6 27h02:30 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
    21564 root       20   0 16.2G 2516M 97360 S  4.0 63.6  1:12.17 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9644 root       20   0 16.2G 2516M 97360 S  1.0 63.6 47:39.34 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
    20451 root       20   0 25808  2020  1208 R  0.0  0.0 25:19.48 htop
     9654 root       20   0 16.2G 2516M 97360 S  1.0 63.6  5:43.32 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9651 root       20   0 16.2G 2516M 97360 S  0.0 63.6  6:34.53 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9653 root       20   0 16.2G 2516M 97360 S  1.0 63.6  1:46.23 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
    21565 root       20   0 16.2G 2516M 97360 S  0.0 63.6  1:12.48 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
    21563 root       20   0 16.2G 2516M 97360 S  0.0 63.6  1:11.12 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
    21472 root       20   0 16.2G 2516M 97360 S  0.0 63.6  1:15.85 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9652 root       20   0 16.2G 2516M 97360 S  0.0 63.6  5:40.13 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
    21562 root       20   0 16.2G 2516M 97360 S  0.0 63.6  1:10.93 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9631 root       20   0 16.2G 2516M 97360 S  0.0 63.6  1h19:18 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9632 root       20   0 16.2G 2516M 97360 S  0.0 63.6  1h19:19 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9633 root       20   0 16.2G 2516M 97360 S  0.0 63.6  7h19:13 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9850 root       20   0 16.2G 2516M 97360 S  0.0 63.6 18:16.00 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9634 root       20   0 16.2G 2516M 97360 S  0.0 63.6  1h29:54 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9722 root       20   0 16.2G 2516M 97360 S  0.0 63.6 50:24.42 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9703 root       20   0 16.2G 2516M 97360 S  0.0 63.6  4h25:50 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9704 root       20   0 16.2G 2516M 97360 S  0.0 63.6  4h26:01 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9662 root       20   0 16.2G 2516M 97360 S  0.0 63.6  1:19.60 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9669 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:08.13 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9665 root       20   0 16.2G 2516M 97360 S  0.0 63.6  6:39.74 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
      385 syslog     20   0  243M  1696   872 S  0.0  0.0  0:13.37 rsyslogd -c5
      397 syslog     20   0  243M  1696   872 S  0.0  0.0  0:05.58 rsyslogd -c5
     9640 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:24.60 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9647 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:10.90 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9635 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:38.98 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
      950 root       20   0 15988   664   488 S  0.0  0.0  0:21.99 /usr/sbin/irqbalance
     9645 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:19.28 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9700 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:10.25 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
    19171 root       20   0 86232  2316  1364 S  0.0  0.1  0:10.56 sshd: root@pts/0
     9648 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:09.37 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9639 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:32.61 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9642 root       20   0 16.2G 2516M 97360 S  0.0 63.6  3:04.59 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9643 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:37.35 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9649 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:55.92 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9650 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:15.67 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9706 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:51.00 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9705 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:38.98 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9667 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:08.34 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9646 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:10.10 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9668 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:07.83 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
     9666 root       20   0 16.2G 2516M 97360 S  0.0 63.6  0:08.01 /usr/bin/java -Xms256m -Xmx1g -Xss256k -
      398 syslog     20   0  243M  1696   872 S  0.0  0.0  0:01.40 rsyslogd -c5
      632 root       20   0 50044  1648  1036 S  0.0  0.0  0:02.10 /usr/sbin/sshd -D
        1 root       20   0 24300  1644   740 S  0.0  0.0  0:01.80 /sbin/init


I can buy more machines, but I don&#39;t know which is better: another machines VS more RAM.

**UPDATE: first and last lines `pmap` of one process**

     root@es2:~# pmap -d 3589
     3589:   /usr/bin/java -Xms256m -Xmx1g -Xss256k -Djava.awt.headless=true -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -XX:+HeapDumpOnOutOfMemoryError -Delasticsearch -Des.foreground=yes -Des.path.home=/root/elasticsearch -cp :/root/elasticsearch/lib/elasticsearch-1.1.1.jar:/root/elasticsearch/lib/*:/root/elasticsearch/lib/sigar/* -Xmx2g -Xms2g -Des.node.name=es2 -Des.node.data=true -Des.node.master=false org.elasticsearch.bootstrap.Elasticsearch
     Address           Kbytes Mode  Offset           Device    Mapping
     0000000000400000       4 r-x-- 0000000000000000 0fd:00000 java
     0000000000600000       4 r---- 0000000000000000 0fd:00000 java
     0000000000601000       4 rw--- 0000000000001000 0fd:00000 java
     000000000188d000     132 rw--- 0000000000000000 000:00000   [ anon ]
     0000000775a00000 2118400 rw--- 0000000000000000 000:00000   [ anon ]
     00000007f6ec0000   37696 rw--- 0000000000000000 000:00000   [ anon ]
     00000007f9390000  111040 rw--- 0000000000000000 000:00000   [ anon ]
     00007f6cb0132000    4872 r--s- 0000000000000000 0fd:00000 _8d.fdt
     00007f6cb05f4000    5792 r--s- 0000000000000000 0fd:00000 _8d_es090_0.tim
     00007f6cb0b9c000    6208 r--s- 0000000000000000 0fd:00000 _8c.fdt
     00007f6cb11ac000    6548 r--s- 0000000000000000 0fd:00000 _a0.fdt
     00007f6cb1811000    7648 r--s- 0000000000000000 0fd:00000 _a0_es090_0.tim
     00007f6cb1f89000    5356 r--s- 0000000000000000 0fd:00000 _78.fdt
     00007f6cb24c4000    6236 r--s- 0000000000000000 0fd:00000 _78_es090_0.tim

     ....
     .......
     ....      (huge text)
     ....
     ......
     ..

     00007f703dc6e000       4 rw--- 0000000000007000 0fd:00000 librt-2.15.so
     00007f703dc6f000      84 r-x-- 0000000000000000 0fd:00000 libgcc_s.so.1
     00007f703dc84000    2044 ----- 0000000000015000 0fd:00000 libgcc_s.so.1
     00007f703de83000       4 r---- 0000000000014000 0fd:00000 libgcc_s.so.1
     00007f703de84000       4 rw--- 0000000000015000 0fd:00000 libgcc_s.so.1
     00007f703de85000    1004 r-x-- 0000000000000000 0fd:00000 libm-2.15.so
     00007f703df80000    2044 ----- 00000000000fb000 0fd:00000 libm-2.15.so
     00007f703e17f000       4 r---- 00000000000fa000 0fd:00000 libm-2.15.so
     00007f703e180000       4 rw--- 00000000000fb000 0fd:00000 libm-2.15.so
     00007f703e181000     904 r-x-- 0000000000000000 0fd:00000 libstdc++.so.6.0.16
     00007f703e263000    2044 ----- 00000000000e2000 0fd:00000 libstdc++.so.6.0.16
     00007f703e462000      32 r---- 00000000000e1000 0fd:00000 libstdc++.so.6.0.16
     00007f703e46a000       8 rw--- 00000000000e9000 0fd:00000 libstdc++.so.6.0.16
     00007f703e46c000      84 rw--- 0000000000000000 000:00000   [ anon ]
     00007f703e481000   10988 r-x-- 0000000000000000 0fd:00000 libjvm.so
     00007f703ef3c000    2048 ----- 0000000000abb000 0fd:00000 libjvm.so
     00007f703f13c000     608 r---- 0000000000abb000 0fd:00000 libjvm.so
     00007f703f1d4000     140 rw--- 0000000000b53000 0fd:00000 libjvm.so
     00007f703f1f7000     180 rw--- 0000000000000000 000:00000   [ anon ]
     00007f703f224000      88 r-x-- 0000000000000000 0fd:00000 libz.so.1.2.3.4
     00007f703f23a000    2044 ----- 0000000000016000 0fd:00000 libz.so.1.2.3.4
     00007f703f439000       4 r---- 0000000000015000 0fd:00000 libz.so.1.2.3.4
     00007f703f43a000       4 rw--- 0000000000016000 0fd:00000 libz.so.1.2.3.4
     00007f703f43b000      96 r-x-- 0000000000000000 0fd:00000 libpthread-2.15.so
     00007f703f453000    2044 ----- 0000000000018000 0fd:00000 libpthread-2.15.so
     00007f703f652000       4 r---- 0000000000017000 0fd:00000 libpthread-2.15.so
     00007f703f653000       4 rw--- 0000000000018000 0fd:00000 libpthread-2.15.so
     00007f703f654000      16 rw--- 0000000000000000 000:00000   [ anon ]
     00007f703f658000       8 r-x-- 0000000000000000 0fd:00000 libdl-2.15.so
     00007f703f65a000    2048 ----- 0000000000002000 0fd:00000 libdl-2.15.so
     00007f703f85a000       4 r---- 0000000000002000 0fd:00000 libdl-2.15.so
     00007f703f85b000       4 rw--- 0000000000003000 0fd:00000 libdl-2.15.so
     00007f703f85c000    1748 r-x-- 0000000000000000 0fd:00000 libc-2.15.so
     00007f703fa11000    2048 ----- 00000000001b5000 0fd:00000 libc-2.15.so
     00007f703fc11000      16 r---- 00000000001b5000 0fd:00000 libc-2.15.so
     00007f703fc15000       8 rw--- 00000000001b9000 0fd:00000 libc-2.15.so
     00007f703fc17000      20 rw--- 0000000000000000 000:00000   [ anon ]
     00007f703fc1c000      52 r-x-- 0000000000000000 0fd:00000 libjli.so
     00007f703fc29000    2044 ----- 000000000000d000 0fd:00000 libjli.so
     00007f703fe28000       4 r---- 000000000000c000 0fd:00000 libjli.so
     00007f703fe29000       4 rw--- 000000000000d000 0fd:00000 libjli.so
     00007f703fe2a000     136 r-x-- 0000000000000000 0fd:00000 ld-2.15.so
     00007f703fe4c000      32 r--s- 000000000005a000 0fd:00000 lucene-codecs-4.7.2.jar
     00007f703fe54000      16 r--s- 0000000000085000 0fd:00000 localedata.jar
     00007f703fe58000       8 r--s- 0000000000012000 0fd:00000 zipfs.jar
     00007f703fe5a000      12 r--s- 0000000000032000 0fd:00000 sunjce_provider.jar
     00007f703fe5d000      16 r--s- 000000000003b000 0fd:00000 sunpkcs11.jar
     00007f703fe61000     556 rw--- 0000000000000000 000:00000   [ anon ]
     00007f703feec000      72 rw--- 0000000000000000 000:00000   [ anon ]
     00007f703fefe000     220 rw--- 0000000000000000 000:00000   [ anon ]
     00007f703ff35000      40 rw--- 0000000000000000 000:00000   [ anon ]
     00007f703ff3f000     148 rw--- 0000000000000000 000:00000   [ anon ]
     00007f703ff64000     580 rw--- 0000000000000000 000:00000   [ anon ]
     00007f703fff5000      32 rw-s- 0000000000000000 0fd:00000 3279
     00007f703fffd000      12 ----- 0000000000000000 000:00000   [ anon ]
     00007f7040000000     268 rw--- 0000000000000000 000:00000   [ anon ]
     00007f7040043000       4 r--s- 0000000000008000 0fd:00000 lucene-memory-4.7.2.jar
     00007f7040044000       8 r--s- 000000000000f000 0fd:00000 pulse-java.jar
     00007f7040046000       4 r--s- 0000000000007000 0fd:00000 java-atk-wrapper.jar
     00007f7040047000       4 r--s- 0000000000002000 0fd:00000 dnsns.jar
     00007f7040048000       4 rw--- 0000000000000000 000:00000   [ anon ]
     00007f7040049000       4 r---- 0000000000000000 000:00000   [ anon ]
     00007f704004a000       8 rw--- 0000000000000000 000:00000   [ anon ]
     00007f704004c000       4 r---- 0000000000022000 0fd:00000 ld-2.15.so
     00007f704004d000       8 rw--- 0000000000023000 0fd:00000 ld-2.15.so
     00007fff9dcbe000     132 rw--- 0000000000000000 000:00000   [ stack ]
     00007fff9ddfe000       8 r-x-- 0000000000000000 000:00000   [ anon ]
     ffffffffff600000       4 r-x-- 0000000000000000 000:00000   [ anon ]
     ffffffffff600000       4 r-x-- 0000000000000000 000:00000   [ anon ]
     mapped: 17052740K    writeable/private: 2523144K    shared: 13562836K
     root@es2:~#

what is VIRT column in HTOP? memory overhead?

I know this sounds like a general question and I&#39;ve seen many similar questions (both here and on the web) but none of them are really like my dilemma.

Say I have this code:

    void GetSomeData(char* buffer)
    {
        // put some data in buffer
    }

    int main()
    {
         char buffer[1024];
         while(1)
         {
              GetSomeData(buffer);
              // do something with the data
         }
         return 0;
    }

Would I gain any performance if I declared buffer[1024] globally?

I ran some tests on unix via the time command and there are virtually no differences between the execution times.

But I&#39;m not really convinced...

In theory should this change make a difference?

Is accessing data in the heap faster than from the stack?

Recently switch to android studio from eclipse. How to check app heap and memory allocation in android studio? In Eclipse we have MAT is there anything in the studio to check heap dump, hprof file?

How to analyze memory using android studio

WildFly 8 is started on a linux server with standalone.sh. I noticed that the server was started with very few heap memory space. 

I need to increase the heap memory space for the server and for applications, which are running on the server. How can I do it?

Content Type	Original Author	Original Content on Stackoverflow
Question	Sophie Sperner	View Question on Stackoverflow
Solution 1 - Eclipse	benzonico	View Answer on Stackoverflow
Solution 2 - Eclipse	Faakhir	View Answer on Stackoverflow
Solution 3 - Eclipse	sashikanta	View Answer on Stackoverflow
Solution 4 - Eclipse	Chinmoy	View Answer on Stackoverflow
Solution 5 - Eclipse	Ravi Pandey	View Answer on Stackoverflow

How to increase application heap size in Eclipse?

Eclipse Problem Overview

Eclipse Solutions

Solution 1 - Eclipse

Solution 2 - Eclipse

Solution 3 - Eclipse

Solution 4 - Eclipse

Solution 5 - Eclipse

Choose a file starting with a given string

android:actionBarStyle requires API level 11

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