You need to set `ulimit -c `. If you have 0 for this parameter a coredump file is not created.  So do this: `ulimit -c unlimited` and check if everything is correct `ulimit -a`. The coredump file is created when an application has done for example something inappropriate. The name of the file on my system is `core.&lt;process-pid-here&gt;`.


You can do it this way inside a program:


    #include &lt;sys/resource.h&gt;

    // core dumps may be disallowed by parent of this process; change that
    struct rlimit core_limits;
    core_limits.rlim_cur = core_limits.rlim_max = RLIM_INFINITY;
    setrlimit(RLIMIT_CORE, &amp;core_limits);


By default many profiles are defaulted to 0 core file size because the average user doesn&#39;t know what to do with them.

Try `ulimit -c unlimited` before running your program.

I&#39;m using the graph api.

I have a logged in user, and want to get back a list of page ids of all the pages that the user is an admin of.

Is there a way of doing this? The docs are pretty bad - and circular.

Facebook: get list of pages that a user is admin of

Regarding the black art of managing memory on iPhone OS devices: what do the different levels of memory warning mean. Level 1? Level 2? Does the dial go to 11?

Context: After an extensive memory stress testing period - including running my iPad app with the iPod music player app playing, I am inclined to ignore the random yet infrequent memory warnings I am receiving. My app **never** crashes. Ever. My app is leak free. And, well, the mems warnings just don&#39;t seem to matter.

Thanks,  
Doug


iPhone OS Memory Warnings. What Do The Different Levels Mean?

My program is written in C++. compiled with gcc, using -g3 -O0 -ggdb flags. When it crashes, I want to open its core dump. Does it create core dump file, or I need to do something to enable core dump creation, in the program itself, or on computer where it is executed? Where this file is created, and what is its name?

How to enable core dump in my Linux C++ program

<p>My program is written in C++. compiled with gcc, using -g3 -O0 -ggdb flags. When it crashes, I want to open its core dump. Does it create core dump file, or I need to do something to enable core dump creation, in the program itself, or on computer where it is executed? Where this file is created, and what is its name?</p>


For example I have this array:

    int a[] = new int[]{3,4,6,2,1};

I need list of all permutations such that  if one is like this, `{3,2,1,4,6}`, others must not be the same. I know that if the length of the array is *n* then there are *n!* possible combinations. How can this algorithm be written?

Update: thanks, but I need a pseudo code algorithm like:

    for(int i=0;i&lt;a.length;i++){
        // code here
    }

Just algorithm. Yes, API functions are good, but it does not help me too much.


Permutation of array

How do I convert a `std::vector&lt;double&gt;` to a `double array[]`?

How to convert vector to array

This questions concerns mostly Unix/Linux style C++ development. I see that many C++ *libraries* store their header files in a &quot;include&quot; folder and source files in an &quot;src&quot; folder. For the sake of conformance I adopted this in my own code. But it is not clear to me whether this should be done for *application* code as well. I&#39;ve seen a few cases where a flat directory structure is used for that. What would be the recommended approach?



Separate &quot;include&quot; and &quot;src&quot; folders for application-level code?

I have a C++ Windows program. I have a text file that has some data. Currently, the text file is a separate file, and it is loaded at runtime and parsed. How is it possible to embed this into the binary as a resource?

Embed Text File in a Resource in a native Windows Application

If we have three functions (foo, bar, and baz) that are composed like so...

    foo(bar(), baz())

Is there any guarantee by the C++ standard that bar will be evaluated before baz?

Order of evaluation in C++ function parameters

I&#39;ve been trying to install lpng142 on my fed 12 system. Seems like a problem to me. I get this error

    [root@localhost lpng142]# ./configure
    bash: ./configure: /bin/sh^M: bad interpreter: No such file or directory
    [root@localhost lpng142]# 

How do I fix this? The `/etc/fstab` file:

    #
    # /etc/fstab
    # Created by anaconda on Wed May 26 18:12:05 2010
    #
    # Accessible filesystems, by reference, are maintained under &#39;/dev/disk&#39;
    # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
    #
    /dev/mapper/VolGroup-lv_root /                       ext4    defaults        1 1
    UUID=ce67cf79-22c3-45d4-8374-bd0075617cc8 /boot                   ext4    
    defaults        1 2
    /dev/mapper/VolGroup-lv_swap swap                    swap    defaults        0 0
    tmpfs                   /dev/shm                tmpfs   defaults        0 0
    devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
    sysfs                   /sys                    sysfs   defaults        0 0
    proc                    /proc                   proc    defaults        0 0

./configure : /bin/sh^M : bad interpreter

I want to create a near 100% load on a Linux machine.  It&#39;s quad core system and I want all cores going full speed.  Ideally, the CPU load would last a designated amount of time and then stop.  I&#39;m hoping there&#39;s some trick in bash.  I&#39;m thinking some sort of infinite loop. 

How to create a CPU spike with a bash command

I use `startx` to start X which will evaluate my `.xinitrc`. In my `.xinitrc` I start my window manager using `/usr/bin/mywm`. Now, if I kill my WM (in order to f.e. test some other WM), X will terminate too because the `.xinitrc` script reached EOF.
So I added this at the end of my `.xinitrc`:

    while true; do sleep 10000; done

This way X won&#39;t terminate if I kill my WM. Now my question: how can I do an **infinite sleep** instead of looping sleep? Is there a command which will kinda like freeze the script?

Bash: infinite sleep (infinite blocking)

I have a Python script that I&#39;d like to compile into a Windows executable. Now, `py2exe` works fine from Windows, but I&#39;d like to be able to run this from Linux. I _do_ have Windows on my development machine, but Linux is my primary dev platform and I&#39;m getting kind of sick of rebooting into Windows just to create the `.exe`. Nor do I want to have to buy a second Windows license to run in a virtual machine such as VirtualBox. Any ideas?

PS: I am aware that `py2exe` doesn&#39;t exactly compile the python file as much as package your script with the Python interpreter. But either way, the result is that you don&#39;t need Python installed to run the script.

Packaging a Python script on Linux into a Windows executable

I am new to shell scripting, so I need some help here.  I have a directory that fills up with backups.  If I have more than 10 backup files, I would like to remove the oldest files, so that the 10 newest backup files are the only ones that are left.

So far, I know how to count the files, which seems easy enough, but how do I then remove the oldest files, if the count is over 10?

    if [ls /backups | wc -l &gt; 10]
    	then
    		echo &quot;More than 10&quot;
    fi

Shell script to count files, then remove oldest files

I am using Visual Studio 2010 Professional Edition, and Windows Vista.

Firstly, I have this code. As you can see, it will crash the program!

    using System;
    
    namespace Crash
    {
        class Program
        {
            static void Main(string[] args)
            {
                string a = null;
    
                if (a.Length == 12)
                {
                    // ^^ Crash
                }
            }
        }
    }

The program will crash on the if statement. Now, I want to find out that it crashed on that if statement. 

If I &quot;Start without Debugging&quot; from Visual Studio, Crash.exe crashes. It uses 1,356kb of memory. I get the Vista option of Close Program/Debug. If I choose Debug, I can open a new instance of Visual Studio, and it points me to a NullReferenceException on the if statement. This is good.

Now let me assume that it crashes on another computer, and I get them to give me a Dump File via Task Manager. It is 54,567kb. Why so big! It&#39;s vast! Anyway, I am less interested in that (slightly) 

If I open that dump with Windbg, I get very little of use to my untrained eye:

    Microsoft (R) Windows Debugger Version 6.12.0002.633 X86
    Copyright (c) Microsoft Corporation. All rights reserved.
    
    
    Loading Dump File [C:\Users\Richard\Desktop\Crash.DMP]
    User Mini Dump File with Full Memory: Only application data is available
    
    Symbol search path is: SRV*C:\SYMBOLS*http://msdl.microsoft.com/download/symbols
    Executable search path is: 
    Windows Server 2008/Windows Vista Version 6002 (Service Pack 2) MP (4 procs) Free x86 compatible
    Product: WinNt, suite: SingleUserTS Personal
    Machine Name:
    Debug session time: Sat Jan 15 11:07:36.000 2011 (UTC + 0:00)
    System Uptime: 0 days 4:24:57.783
    Process Uptime: 0 days 0:00:05.000
    ........................
    eax=002afd40 ebx=77afa6b4 ecx=002afd48 edx=00000001 esi=001cdaa4 edi=00000000
    eip=77bf5e74 esp=001cda5c ebp=001cdacc iopl=0         nv up ei ng nz ac pe cy
    cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000297
    ntdll!KiFastSystemCallRet:
    77bf5e74 c3              ret

However, this is of less interest to me. As far as I can tell, I need to write commands in to get useful output, and Visual Studio is better. 

So I open it with Visual Studio. I can choose to &quot;Debug with Native Only&quot;, but I get lots of things that mean something to clever people like you, and I am not clever! I get these two screens:

 ![enter image description here][1] 

 ![enter image description here][2]

**So, my question:**

How do I show Visual Studio to my source code?

Also, is there a way to get a smaller dump file? It seems ridiculously big, even after compressing. I don&#39;t understand why there couldn&#39;t be one which is only just a tiny bit bigger than the program&#39;s footprint, and still get a nice debugging, with the source code.


  [1]: http://i.stack.imgur.com/LfZFh.jpg
  [2]: http://i.stack.imgur.com/9satg.jpg

Debugging dump files in Visual Studio

I just recently started looking at dump files to help me analyze crashes of the w3wp process on our production environment at work...

And I would like to know, what are the differences between a minidump and a fulldump file ?

minidump vs. fulldump?

I have a .NET service with a normal private working set of about 80 MB. During a recent load test, the process reached 3.5 GB memory usage causing the whole machine to be low on physical memory (3.9 of 4 GB used), and the memory was not released long after the load test was stopped. Using task manager, I took a dump file of the process and opened it in Visual Studio 2010 SP1, and I am able to start debugging on it.

How do I diagnose the memory issue? I have dotTrace Memory 3.x at my disposal, does it support memory profiling on dump files? If not, will the memory profiling features of Visual Studio 2010 Premium help (I currently have Professional)? Can WinDbg help?

&gt; **UPDATE:** The new *Visual Studio 2013 Ultimate* can now natively diagnose memory issues using dump files. See [this blog post][1] for more details.


  [1]: http://blogs.msdn.com/b/visualstudioalm/archive/2013/06/20/using-visual-studio-2013-to-diagnose-net-memory-issues-in-production.aspx

Content Type	Original Author	Original Content on Stackoverflow
Question	Alex F	View Question on Stackoverflow
Solution 1 - C++	user184968	View Answer on Stackoverflow
Solution 2 - C++	user2167243	View Answer on Stackoverflow
Solution 3 - C++	msw	View Answer on Stackoverflow

How to enable core dump in my Linux C++ program

C++ Problem Overview

C++ Solutions

Solution 1 - C++

Solution 2 - C++

Solution 3 - C++

iPhone OS Memory Warnings. What Do The Different Levels Mean?

Facebook: get list of pages that a user is admin of

Attributions