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  • What is shrink_slab, and why is it showing up in /var/log/messages?

    - by Steve Kehlet
    I'm investigating some application issues on a Linux system and noticed this around the time of the most recent problem, but not close enough to be definitively related: Jun 7 17:51:49 localhost kernel: shrink_slab: nr=-155456000 Jun 7 17:51:49 localhost kernel: shrink_slab: nr=-157859400 Jun 7 17:51:49 localhost kernel: shrink_slab: nr=-157833400 Jun 8 06:20:23 localhost kernel: shrink_slab: nr=-284172800 What is this? Googling isn't helping, I get that it's something with VM, but why is it suddenly showing up in /var/log/messages? Edit: I take it it's showing this because the number of pages it could free ("nr") is negative. Which is presumably a bad thing. I found patches for newer kernels that display a more useful message to this effect. Still not sure what this means though, or what I need to do about it.

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  • Why does pinging 192.168.072 (only 2 dots) return a response from 192.168.0.58?

    - by George Duckett
    I mistakenly missed the dot off of an IP address and typed in 192.168.072. To my surprise I connected to a machine at 192.168.0.58 If I ping 192.168.072 I get responses from 192.168.0.58. Why is this? I'm on a Windows PC on a Windows domain. If I ping 192.168.72 I get a response from 192.168.0.72, so it seems the 0 in 072 (in my original mistake) is significant. This question was a Super User Question of the Week. Read the blog entry for more details or contribute to the blog yourself

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  • Why is there no 64-bit Linux Firefox build?

    - by Legooolas
    It seems that I have to build my own 64-bit Firefox for Linux, as Mozilla won't support it until Firefox 4. Why is this? It looks to me as though it works fine, although without some of the speed improvements to the Javascript engine which the 32-bit version gets. (Edit: Yes I could run the 32-bit version but I'm trying to keep my system clear of 32-bit cruft and libraries etc, and all the plug-ins worked fine in 3.0.11 64-bit unofficial builds.) Update : No longer relevant as Mozilla provide 64-bit builds, but they don't show them on the download pages of mozilla.org, just on the ftp site as mentioned in one of the answers below.

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  • Why sizes are different, and what do they mean?

    - by Ramy
    I have a 1 TB hard drive that consists of one NTFS partition which I use to back up my data (no operating system). The size of all the data in it is : 726 GB, size on disk: 728 GB, and the used space when I check the properties is: 731 GB. There's a 5 GB difference between the size and the used space. Why is that huge difference there? What's the difference between these sizes? (size, size on disk, and used space) Is there a way to calculate the difference, and be sure the HDD is not messing around? Is that normal?

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  • Why do I have to explicitly cast sometimes for varargs?

    - by Daniel Lew
    I've got a Class that uses reflection a lot, so I wrote a method to help out: private <T> T callMethod(String methodName, Class[] parameterTypes, Object[] args) { try { Class c = mVar.getClass(); Method m = c.getMethod(methodName, (Class[]) parameterTypes); return (T) m.invoke(mVar, args); } // Insert exception catching here [...] } This worked well for any method that had parameters, however I had to explicitly cast parameterTypes to Class[] in order for this to work for methods with no parameters (e.g., callMethod('funName', null, null);). I've been trying to figure out why this is the case. It seems to me that if parameterTypes, when null, had no concept of what type it is (Class[]), then I'd need to cast it for getMethod(). But if that's the case, why is getMethod() able to tell the difference between null, and (Class[]) null when the method is invoked?

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  • After moving our Servers to a virtual environment using VMware - SQL timeouts came in, why?

    - by RayofCommand
    We moved our servers to a virtual cloud (VMware) where only our servers are in. But as soon as we finished migrating everything we are fighting against SQL Timeouts and machine slowdowns we can't explain. Even though we ~ doubled the servers capacity while switching from physical to virtual. Now I googled and found that we are not alone. People are complaining about poor performance after moving to a cloud managed by VMware. Are there any known issues? Sometimes our services can't access a disk or SQL receives a timeout and we have no idea why.

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  • Why are the prices for broadband bandwidth at data centers much higher than consumer/small business offerings?

    - by odemarken
    The prices for broadband bandwidth at data centers are sometimes as much as 10x higher than for a typical small business/consumer connection, at least where I live. Now, I understand those are two differend kind of products, but what exactly are the differences? Is it mainly because the bandwidth you get at a data center is guaranteed (CIR), while a consumer offer lists maximal bandwidth (EIR/MIR)? Or are there other factors as well? (Note: my previous, much more specific question on the same general topic was closed as not constructive. I tried to extract the core issue and present it in a way that can be answered objectively. If you feel that this question is still bad and should be closed, please care to comment and explain why.)

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  • Why is 'using namespace std;' considered a bad practice in C++?

    - by Mana
    Okay, sorry for the simplistic question, but this has been bugging me ever since I finished high school C++ last year. I've been told by others on numerous occasions that my teacher was wrong in saying that we should have "using namespace std;" in our programs, and that std::cout and std::cin are more proper. However, they would always be vague as to why this is a bad practice. So, I'm asking now: Why is "using namespace std;" considered bad? Is it really that inefficient, or risk declaring ambiguous vars(variables that share the same name as a function in std namespace) that much? Or does this impact program performance noticeably as you get into writing larger applications? I'm sorry if this is something I should have googled to solve; I figured it would be nice to have this question on here regardless in case anyone else was wondering.

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  • Why did the C# designers attach three different meanings to the 'using' keyword?

    - by gWiz
    The using keyword has three disparate meanings: type/namespace aliasing namespace import syntactic sugar for ensuring Dispose is called The documentation calls the first two definitions directives (which I'm guessing means they are preprocessing in nature), while the last is a statement. Regardless of the fact that they are distinguished by their syntaxes, why would the language developers complicate the semantics of the keyword by attaching three different meanings to it? For example, (disclaimer: off the top of my head, there may certainly be better examples) why not add keywords like alias and import? Technical, theoretical, or historical reasons? Keyword quota? ;-) Contrived sample: import System.Timers; alias LiteTimer=System.Threading.Timer; alias WinForms=System.Windows.Forms; public class Sample { public void Action { var elapsed = false; using(var t = new LiteTimer.Timer(_ => elapsed = true) { while (!elapsed) CallSomeFinickyApi(); } } } "Using" is such a vague word.

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  • Why does an ampersand in URL cause failure of some command in Mac OS X Terminal?

    - by congliu
    Why does an ampersand in URL cause failure of the following command? I want to open a web page by running Safari in Terminal, placing the URL as an argument. This works as expected: open -a safari "http://endic.naver.com/search.nhn?sLn=en&searchOption=all&query=good" But once the quotes being removed, it wouldn't work as expected: open -a safari http://endic.naver.com/search.nhn?sLn=en&searchOption=all&query=good Instead, it returns: [3] 5395 [4] 5396 [1] Done open -a safari http://endic.naver.com/search.nhn?sLn=en [2] Done searchOption=all Seems like ampersand in the URL was treated as "running previous command in the background", though there is no space following the ampersand in the URL.

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  • Why "constructor-way" of declaring variable in "for-loop" allowed but in "if-statement" not allowed?

    - by PiotrNycz
    Consider this simple example: /*1*/ int main() { /*2*/ for (int i(7); i;){break;} /*3*/ if (int i(7)) {} /*4*/ } Why line-2 compiles just fine, whilst line-3 gives the error? This is little strange to me why if-statement is in this aspect treated worse than for-loop? If this is compiler specific - I tested with gcc-4.5.1: prog.cpp: In function 'int main()': prog.cpp:3:7: error: expected primary-expression before 'int' prog.cpp:3:7: error: expected ')' before 'int' I was inspired by this question [UPDATE] I know this compiles just fine: /*1*/ int main() { /*2*/ for (int i = 7; i;){break;} /*3*/ if (int i = 7) {} /*4*/ }

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  • Why does my CentOS logrotate run at random times?

    - by Mike Pennington
    I put a logrotate configuration file in /etc/logrotate.d/ and expected the logs to rotate at a consistent time; however, they do not... log rotation times are seemingly random +/- one hour. Why are the log rotation start times random, and how can I change this? Informational: my logrotate config file looks like this... /opt/backups/network/*.conf { copytruncate rotate 30 daily create 644 root root dateext maxage 30 missingok notifempty compress delaycompress postrotate ## Create symbolic links in daily/ PATH=`/usr/bin/dirname $1`; FILE=`/bin/basename $1`; /bin/ln -s $1 $PATH/daily/$FILE endscript }

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  • Why does Notepad "randomly" make pasted text a smaller font size?

    - by Coldblackice
    Sometimes when I copy and paste text into Notepad, it will paste the text in the default Notepad font and size, however, the latter half of the pasted line will be multiple font sizes smaller. I'm stumped as to why this is happening. I wondered if it was perhaps some type of hidden formatting that was being copied into Notepad, but I believe that Notepad strips the formatting. I've subsequently taken the same text and tried copy and pasting it into URL bars and CMD prompts to strip any potential formatting (even though it was plaintext copied from web), and then re-pasted into Notepad, but it still leaves this phenomenon. Additionally, when resizing the Notepad window, it will change what portion of the line is default sized and downsized, as seen in the screenshot posted below. The three windows are actually the same Notepad window, each with a different resizing and the resulting text resizing.

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  • Why does 'dd' not work for creating bootable USB?

    - by jdowner
    Recently I wanted to create a bootable USB of Linux mint. I found that there was a lot of conflicting advice/experience about whether the 'dd' command could be used to create a bootable USB. I decided to download an ISO and try. While dd definitely put the image on the USB stick it was not bootable. So my question is what is the magic ingredient that will make this work or why has this approach persisted if it does not work? This is the command I used, dd if=/mint/iso/image of=/dev/sdb1 oflag=direct

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  • Why can't I set attribute "TYPE" of LI element in IE?

    - by Petr Urban
    Hello, I've just come to an unusual beghavior of Internet Explorer IE (v8.0.6001.18904). When I try to set "type" attribute of any <LI> element, it will result into error. I used jQuery (v1.32): $("<li>").attr("type", "test"); The same thing works for DIV. LI element does not seem to have "type" attribute reserved by HTML or XHTML definitions. It also might be jQuery issue. Solution is simple - just use another attribute name :-) But is there someone out there who knows WHY does this error occur? Could it happen with another attribute names? Why the error comes with LI element only?

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  • C# Why is a treeview node clicked when canceled is set to true?

    - by Martijn
    In my winform application I have a treeview. To give the idea that a node is disabled I set the node's forecolor and I when the BeforeSelect fires I set e.cancel to true. However when a node's tag meets some criteria a node may be selected. So that's why I have a NodeMouseClick. But when a node may not be clicked I set the e.cancel to true in the BeforeSelect event. The problem now is, the NodeMousClick event is always fired and all the code is ececuted, even when I set e.cancel to true in the BeforeSelect event. Why is that?

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  • Why do I see different TCP behaviour between IIS and FTP server applications on Windows 2003?

    - by rupello
    I am comparing Wireshark traces of a 10MB file download file from: the FileZilla FTP server and IIS (using HTTP) on the same Windows 2003 server. The FTP download performs faster and the trace shows the server behaving as expected, sending more data to the client with every ACK received: Link to full-size image The HTTP server trace shows a more bursty pattern. The timing of the send bursts are sometimes unrelated to any ACKs received from the client (circled in red): Link to full-size image Anyone have a suggestion as to why IIS traffic is having like this? Update: We have tried modifying the http.sys registry settings (setting MaxBytesPerSend to 256k and MaxBufferedSendBytes to 64k as recommended). Changing MaxBytesPerSend does seem to improve performance by increasing the amount of in-flight data , but we still see the same bursty pattern.

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  • Why does the Windows XP Task Manager icon disappear from the tray?

    - by Jason Owen
    One of the more annoying bugs in Windows XP is the tendency for the Task Manager icon to not show up in the tray (aka the notification area). Sometimes it does, sometimes it doesn't, and it's not consistent enough to have an obvious cause. Looking on Google turns up a bunch of forums that have the same problem but no working solution. Why does the task manager icon sometimes not show up? How can I repair it when this happens (how can make it show up when it's missing)? How can I prevent it from not working in the first place, so that I don't have to worry about repairing it after the fact?

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  • Container<ImplementerOfIInterface> is not Container<IInterface>. Why not?

    - by Chris Simmons
    Why wouldn't DoesntWork() work below? The error is: Cannot implicitly convert type 'List' to 'IEnumerable'. An explicit conversion exists (are you missing a cast?). I know this is something about generic/templates I'm not getting, but List is IEnumerable and Implementer is an IInterface. I don't see why this needs to be casted (or if it really can be). public interface IInterface { // ... } public class Implementer : IInterface { // ... } IEnumerable<IInterface> DoesntWork() { List<Implementer> result = new List<Implementer>(); return result; }

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  • Why I am forced to write the (Data Constructor) name with first letter in small case?

    - by Optimight
    Why I am forced to write "liOfLi" in place of "LiOfLi"? Please guide. code in baby.hs LiOfLi = [ [1,3,4,5,6,8], [ 12, 13, 15, 16, 19, 20], [23, 24, 25, 45, 56] ] ghci response: ghci :l baby [1 of 1] Compiling Main ( baby.hs, interpreted ) Failed, modules loaded: none. ghci baby.hs:29:1: Not in scope: data constructor `LiOfLi' When changing the initial letter to smaller case code in baby.hs liOfLi = [ [1,3,4,5,6,8], [ 12, 13, 15, 16, 19, 20], [23, 24, 25, 45, 56] ] ghci response: ghci :l baby [1 of 1] Compiling Main ( baby.hs, interpreted ) Ok, modules loaded: Main. Following are the SO questions I refered but I failed to understand the rules/ logic and get the answer for (my) abovementioned question. Why does Haskell force data constructor's first letter to be upper case? the variable names need to be lowercase. The official documentation related to this is at haskell.org/onlinereport/intro.html#namespaces – (the SO comment by) Chris Kuklewicz

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  • Python - Why ever use SHA1 when SHA512 is more secure?

    - by orokusaki
    I don't mean for this to be a debate, but I'm trying to understand the technical rationale behind why so many apps use SHA1, when SHA512 is more secure. Perhaps it's simply for backwards compatibility. Besides the obvious larger size (128 chars vs 40), or slight speed differences, is there any other reason why folks use the former? Also, SHA-1 I believe was first cracked by a VCR's processor years ago. Has anyone cracked 512 yet (perhaps with a leaf blower), or is it still safe to use without salting?

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