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• Virtual Machines: What components should I upgrade to improve running virtual machines?

  - by joshsvoss

  at work I need to have one or sometimes two instances of a vmware virtual Windows 7 machine running on my real Windows 7 machine. The computer I'm using is Dell Precision 490 from 2009 I believe, possibly earlier. Running Windows 7 ultimate. Problems while running VM's: The entire computer slows down when a vmware instance is running. Pages take a while to react to a scroll, applications take forever to launch, and programs hang both in the virtual machines and on the real one. So, what components should I upgrade to improve this? I guess a more pointed question would be, which components will help the most? Possible options: Getting 8gb of RAM instead of 4gb new graphics card new processors? (Is that really an option?) My intuition tells me it will be a combination of the RAM and graphics card. There is also the possibility that an '09 tower just isn't cut out for vm's and our business should purchase a new tower.

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• Is Mac OS X open source?

  - by hasen j

  I learned recently (on superuser) that Mac OS X uses the bash shell. I also know that OS X has a UNIX core. I was searching for information about OS X and Open Source on google, but what I found was this site: http://www.opensource.apple.com/ Which seems to include the source code for OS X. For instance, one of the links reads: Mac OS X 10.5.7 Source So, is OS X open source? There's an Apple Public Source License, but I'm bad at understanding legalese. Update Extra/Bonus question: Besides the kernel, What about the various other pieces? The X server? Window Manager? File explorer? etc. What's open source and what's not?

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• What advantages does mod_evasive have over mod_security2 in terms of DDOS protection?

  - by Martynas Sušinskas

  Good day, I'm running an Apache2 server in front of a Tomcat and I need to implement a DDOS protection mechanism on the Apache2 layer. I have two candidates: mod_evasive and mod_security2 with the OWASP core rule set. Mod_security is already installed for overall protection, but the question is: is it worth adding mod_evasive besides mod_security just for the DDOS (does it have any major advantages) or the OWASP crs rules in the /experimental_rules/ directory (modsecurity_crs_11_dos_protection.conf) provide the same protection? Or it's just a matter of preference? The sites are not very high traffic normally. Thank you for your answers, Martynas

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• Where does Picasa store albums?

  - by Dan

  For people searching, the question might also be phrased: How do I restore Picasa albums from backup? When I reinstalled my computer and restored my photos from backup, some of my albums showed up, but many didn't. I've found the following info: Picasa on Windows stores (stored?) album info in these places: Vista: C:\Users\<myaccount>\AppData\Local\Google\Picasa2Albums\ XP: C:\Documents and Settings\<myaccount>\Local Settings\Application Data\google\Picasa2Albums\ I restored that folder and was still missing many of my albums. That folder also contained a folder of backups, but the most recent one was from a long time ago and I've created albums since then. According to https://support.google.com/picasa/bin/picasa.google.com/support/bin/static.py?hl=en&page=release_notes.cs, since the Dec 8, 2011 build, Picasa saves album info in .ini file(s). This probably explains the albums that I do see. http://katelharrison.blogspot.com/2012/01/how-to-restore-picasa-albums-mac.html has some great info on restoring albums on Macs, but the folder structure seems to be different there than on Windows.

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• unknown codec 0x0064 (G726 ADPCM)

  - by Colin Pickard

  I've got a number of audio recordings which I can't play back. It appears to be a case of a missing codec, but I can't locate the codec in question. VLC will not play the files. ffmpeg gives the error Unsupported codec (id=0) for input stream 0. This is the output from MediaInfo. General CompleteName : Format : Wave FileSize/String : 164 KiB Duration/String : 1mn 24s OverallBitRate/String : 16.0 Kbps Audio Format : ADPCM CodecID : 64 CodecID/Info : G.726 CodecID/Hint : APICOM Duration/String : 1mn 24s BitRate_Mode/String : Constant BitRate/String : 16.0 Kbps Channel(s)/String : 1 channel SamplingRate/String : 8 000 Hz BitDepth/String : 2 bits StreamSize/String : 164 KiB (100%) Can anyone help?

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• Can I get dual monitor support (2xDVI) from my (DVI+HDMI) graphics card?

  - by nray

  It seems that pure 2 x DVI dual head video cards are becoming rare. Most cards feature something like 1 x DVI plus 1 x HDMI plus 1 x VGA or some other interface. The idea seems to be that you can just use an HDMI <= DVI adapter. One result is that cards are seldom marked " 2 x DVI " anymore, but does this mean that they support simultaneous output on all interfaces? Are all cards dual head these days? Take Asus's nVidia cards for example, they routinely have 1 x DVI plus 1 x HDMI instead of 2 x DVI, so my question is, are these equivalent to a dual head DVI card, or is there some detail required for dual monitor support? I use dual-monitor stretched desktops for digital signage projects.

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• How does "Compatability Mode" in Windows 7 affect the application?

  - by Robert C. Cartaino

  Background: Based on the answer given to this question: "Skype behaviour in the Windows 7 Superbar" ...you can get Skype to minimize to the system tray (rather than the task bar) by running it in compatibility mode. (red flags going off in my head) That's the behavior that I want but what does "compatibility mode" do to the executing application? I am concerned about changing the execution mode of an entire (important) application to a previous generation just to alter the user interface behavior a bit. So, what does compatibility mode actually do internally? What are the disadvantages, as in "how could the application (Skype) suffer?"

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• TextMate suddenly highlighting all text dark red...?

  - by AP257

  I'm using TextMate on Snow Leopard, don't know much about how it works. After I hit an unknown keyboard shortcut, it suddenly decided to highlight almost all text in my Python files dark red - making all my Python virtually unreadable! I must have accidentally pressed a shortcut - but I've no idea what I did or how to turn it off, and can't find any relevant help in the manual or form. Even just 'turn off all highlighting' would do. Anyone know how to turn this highlighting off? Bit desperate! UPDATE: Figured it out. There's a tiny, tiny dropdown list at the very bottom of every TextMate editing window where you can set the language, so TextMate can highlight invalid syntax - I'd accidentally clicked on it and set the language to something other than Python. Will leave the question up though in case others have the same problem.

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• How do I objectively measure an application's load on a server

  - by Joe

  All, I'm not even sure where to begin looking for resources to answer my question, and I realize that speculation about this kind of thing is highly subjective. I need help determining what class of server I should purchase to host a MS Silverlight application with a MSSQL server back-end on a Windows Server 2008 platform. It's an interactive program, so I can't simply generate a list of URLs to test against, and run it with 1000 simultaneous users. What tools are out there to help me determine what kind of load the application will put on a server at varying levels of concurrent users? Would you all suggest separating the SQL server form the web server, to better differentiate the generated load on the different parts of the stack?

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• Create mix CDs from MP3 files

  - by Dave Jarvis

  How would you write a script (preferably for the Windows commandline) that: Examines thousands of MP3 files stored on a single drive (e.g., G:\) Randomizes the collection Populates a series of directories up to 650MB worth of songs (without exceeding 650MB) Every song is shucked exactly once (Optional) The directory size comes as close as possible to 650MB The DIR, COPY, and XCOPY commands have no explicit file size switches. A few Google searches have come up with: File size condition in DOS Cygwin and UWIN DOS File sizes It would be ideal if UNIX-like environments can be avoided. My question, then: How do you compare file (or directory) sizes using the Windows commandline?

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• Is it safe to use S3 over HTTP from EC2, as opposed to HTTPS

  - by Marc

  I found that there is a fair deal of overhead when uploading a lot of small files to S3. Some of this overhead comes from SSL itself. How safe is it to talk to S3 without SSL when running in EC2? From the awesome comments below, here are some clarifications: this is NOT a question about HTTPS versus HTTP or the sensitivity of my data. I'm trying to get a feeling for the networking and protocol particularities of EC2 and S3. For example Are we guaranteed to be passing through only the AWS network when communicating from EC2 to S3 Can other AWS users (apart from staff) sniff my communications between EC2 and S3 Is authentication on their api done on every call, and thus credentials are passed on every call? Or is there some kind of authenticated session. I am using the jets3t lib. Feedback from people with some AWS experience would be appreciated. Thanks Marc

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• IRC Server For 50 People?

  - by Ferman

  I've seen this question before and I am sure it will be fine but I want assurance before I do it. I am looking at running an IRC server with 128MB of ram and 500GB of BW. The server will usually handle at least 15 people throughout the whole day but there will be times where there can be at least 50 people in it maybe even more. I might also have a few extra channels on there so probably like at least 5 channels and the same people on the one channel will be in the other channels. Also I am trying to decide on the software to use. I am looking at using NGIRCD but I am not sure does anyone else have any recommendations? http://ngircd.barton.de/ I want to say thank you in advanced for anyone that is helping me. :)

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• How do I run AWS code on an EC2 instance?

  - by Marianna

  I just started with Amazon web services, and I have an EC2 instance. I downloaded the JAVA SDK and the Eclipse toolbox. I am able to run a sample program locally on my PC and connect to the Amazon databases, etc. My question is, what do I need to do to get this working on my EC2 instance? This may not even be specific to AWS. On Eclipse, I can just "Run as Application" and run any code. On the server side, what do I need to do? Should I ftp over my .java files? Should I export it to a jar and upload that? Do I need to install anything special to actually run it?

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• How much processor speed and cores do I need for these tasks?

  - by ajay

  I am planning to buy a new laptop as I find my current one very slow. My question here is specifically related to RAM size and CPU power. I will mostly be doing development (not much games). I would be dabbling in distributed computing, multithreaded and data intensive parallelizable tasks on multi-cores. For e.g. I would want to be able to Concurrent programming in Scala/Java/Clojure etc. and be able to see parallelization. Furthermore, I would want the RAM to be enough. But from a developer machine standpoint, do you think 4GB RAM and 2.53GHz Dual Core processor would be enough. I'm basically looking at this model: http://store.apple.com/us/configure/MC118LL/A?mco=MTM3NDcyODk (link dead)

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• Can I trust that ZFS is consistent between Linux and FreeBSD?

  - by iconoclast

  I'm planning to build a FreeNAS box sometime soon, but if ZFS on Linux eventually proves to be reliable, I might want to switch, just to have a more familiar OS. So I'm wondering if I can trust that the different implementations of ZFS are compatible. In other words, if I just swap out the boot disk from FreeNAS to Linux or OpenIndiana, can I trust that nothing bad will happen to my data? This may seem like a stupid question--obviously it ought to be compatible--but I'm guessing that ZFS isn't commonly used in cases where drives are moved between computers, so I'm hoping someone can provide a better answer than just "it ought to be".

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• How to track url redirects in browser?

  - by Prashant

  I have typed http://example.com/load/ in my browser window and pressed "ENTER" key. Now on press of enter this website redirects me to http://example.com/load/1/ and then http://example.com/load/2/ and then I finally landed on this url http://example.com/load/3/. These redirection happens at website end, I am not aware where I am going. But I finally landed on this url: http://example.com/load/3/ I want to track where all my browser gone all urls, I am not seeing it in my history as its redirect at website end. Is there any firefox addon or some toll which can track this for me? I am not sure where to ask this question, so asking it here, moderators please check!

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• How to contact an emergency service using only Internet?

  - by Vi.

  Suppose you are apart from the mobile or whatever phone (so can't call 112 or 911 or 999), but have have access to a computer with internet connection. How do you call/message an emergency service (of whatever country in hope they will route the request to the correct destination) using only Internet? Maybe there's some 911-like website or public SIP or whatever? Or better go to some chat/forum/StackExchange/whatever and ask somebody to make a call for you? (will users really believe?) /* 1. I'm not in any emergency, just curious. 2. I'm not sure on what SE site to ask this question. */

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• Why does this package (ppa:ondrej/php5, it's PHP 5.5) break the apache2 installation?

  - by Panique

  Problem Currently this package (ppa:ondrej/php5) is quite popular for installing the latest version of PHP 5.5. I've worked quite much with it, and everything ran smoothy, on several (dev) servers. But from today (?) this breaks the apache2 installation (it empties the /etc/apache2/sites-available/default file). This is reproduceable. Way to reproduce (on naked Ubuntu 64 12.04 LTS) // basic installs sudo apt-get update sudo apt-get install apache2 sudo apt-get install php5 Apache is fine, nano /etc/apache2/sites-available/default has valid content now // getting PHP 5.5.x sudo apt-get install python-software-properties (for add-apt-repository) sudo add-apt-repository ppa:ondrej/php5 sudo apt-get update sudo apt-get install php5 // php -v shows successful install of PHP 5.5.x now Apache is broken, nano /etc/apache2/sites-available/default is empty now Question Why does this happen ? According to https://launchpad.net/~ondrej/+archive/php5 there were no changes in the last few days.

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• Ulimit settings in Oracle 11g on Linux 5

  - by Stuart

  Is there an issue with "Ulimit -Hn" being set too low (at 1024) when (Oracle recommend 65536)? This is for Oracle 64-bit 11g on Linux 5. It is one of the settings that appears to be woefully short of its recommendation. But I am also aware that the database server in question is an Oracle Data Guard Local Standby and should only really have a connection or two from its Primary database server (to ship the redo logs across). The Local Standby database server has 'hung' about 3 times in as many months and then requires a reboot. I do not have access to this server, so rely on others to look at logs etc. The sanity check on kernel params uncovered the low value for "ulimit -Hn". Has anyone ever seen that 'low' value cause a hang or crash?

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• How to Diagnose a Pre-Operating System Load or Hardware Issue

  - by soandos

  How can I find out if my problem is hardware based? If it is, how can I figure out what component is to blame How can I fix other pre-operating system issues? As an aside, what are all of these components responsible for, and if they break, what can go wrong? (This question comes up frequently, and the suggested solutions are usually the same. This community wiki is an attempt to serve as the definitive, most comprehensive answer possible. Feel free to add your contributions via edits.)

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• Configuring Notepad++ to run knitr2pdf

  - by Stat-R

  Sorry for such a basic question but since I do not have a degree in programming... I am a user of R, knitr and Notepad++. I was trying to configure Notepad++ to run pdflatex and knitr(knit2pdf). By googling I found how to do it for pdflatex but I did not find anything for sweave/knitr. The following are the good ones for pdflatex http://www2.sofi.su.se/~mbe/docs/npp_r_latex.pdf http://www.tlhiv.org/ma497/software/ I inserted cmd /c cd /d "$(CURRENT_DIRECTORY)" && pdflatex.exe -shell-escape "$(FILE_NAME)" into the runrun menu in Notepad++. I do not fully understand the command though. I will appreciate any help on this. Please direct me if you can to any resource for learning these commands. I will be grateful to get any help in configuring Notepad++ for running knitr.

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• How to check the version of the dynamic linker?

  - by netvope

  If I run a binary compiled on a newer Linux distro on an older Linux distro, I may get an error like this: a.out: error while loading shared libraries: requires glibc 2.5 or later dynamic linker How can I check the version of the dynamic linker in a Linux system? Is it provided by a package? If so, what's the name of the package? And a theoretical question: Is it possible to update the dynamic linker? (I don't think I'm going to do this but I just want to know.)

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• Can't restore HDD using multiple programs

  - by jonney

  Please refer to my original question about this issue. I tried GetDataBack and it doesn't seem to scan or do anything. I chose the default settings from the first screen and then on step 1 I chose my HDD that's damaged. In step 2, nothing happens. It doesn't scan or do anythong, and on step 3 it doesn't display any of my files. I have also tried TestDisk and what happens in TestDisk is that when I try to fix and rebuild the MFT, it says this: MFT and MFT mirror are bad. Failed to repair them. Here is the status of that HDD under Testdrive: I also tried this app and got no results when I tried to recover the files. I keep getting this error: Last but not least, I tried Recuva and that simply says it's unable to read the MFT. Any suggestions? I have tried various apps already and none of them seems to work.

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• OpenX : mySql VS PostgreSQL

  - by Andreas Grech

  I have been using OpenX's AdServer with mySql as a backend, and since OpenX allows one to choose between mysql and postgres, I was wondering if anyone ever used Postgres and wished to talk about their experience with it here. Also, is there anyone who maybe tried using OpenX with both and can offer a comparison between the databases ? I am asking this question because I was having some trouble recently with mySql because some tables crashed occasionally and proved problematic because of the overhead they generated; and as a consequence of this, Statistics where not being generated.

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• AWS:EC2:: Why my web folder is called "html"??

  - by heathub

  P.S Q stands for Question. My environment is: Amazon linux 64 bit (Q1. i dont if its ubuntu or red-hat, is there any way to check?) And I need to run php and mysql, thus I installed httpd (Q2. is httpd == apache??), but on my default page, it says: please upload files to /var/www/html folder. Q3.This is the first time I set aws ec2 server myself, my previous experience is hosting with hosting company. Normally in hosting company, my web directory is called "www" or "public_html" or "htdocs".Why is my folder name is "/var/www/html"? Am I installed wrong apache?

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