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• Why are my DNS Lookups so long (300+ms) when accessing my web site?

  - by Travis

  I'm running a Fedora 11 server with Apache 2. I'm trying to optimize so things are as fast as possible from the server side, and I'm noticing (via Firebug for Firefox) that upon loading the homepage of one of the sites on the web server that for every file it loads (HTML, CSS, JavaScript, GIF, PNG, JPG, etc.), it does a DNS lookup. All of the files it is looking up are local to the server, so I'm surprised to see it even do a DNS lookup. Also, each of these lookups is in the 150-450ms range, which is way too high for my liking. I've tried adjusting /etc/resolve.conf to use Google's Public DNS servers. I restarted the network service and tapped the page again, but the numbers didn't go down. I've reverted back to the default DNS servers since I didn't see any gain. Any ideas on what is causing it to: a) do the dns lookup in the first place, and b) take so long when doing the actual lookup? Thanks in advance.

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• Justification of Amazon EC2 Performance

  - by Adroidist

  I have a .jar file that represents a server which receives over TCP an image in bytes (of size at most 500 kb) and writes it file. It then sobels this image and sends it over TCP socket to the client side. I ran it on my laptop and it was very fast. But when I put it on Amazon EC2 server m1.large instance, i found out it is very slow - around 10 times slower. It might be the inefficiency in the code algorithm but in fact my code is nothing but receive image (like any byte file) run the sobel algorithm and send. I have the following questions: 1- Is it normal performance of Amazon EC2 server- I have read the following links link1 and link2 2- Even if the code is not that efficient, the server is finally handling a very low load (just one client), does the "inefficient" code justify such performance? 3- My laptop is dual core only...Why would the amazon ec2 server have worse performance that my laptop? How is this explained? Excuse me for my ignorance.

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• Recover Bios HP DV9700T windows 7 64

  - by petebob796

  I downloaded the latest DV9700t bios (.59) and ran the update tool in windows 7 64. This seemed to go ok and did the usual system will shutdown in 10 seconds dialog. Updon the reboot nothing happens I get no BIOS screen or anything so I think the bios update went wrong. Which I am annoyed about I have never known a bios update to fail before and lots of people on the internet seem to have had the same problem with the same model. There is a way to recover apparently using crisdisk utility and creating a bootable usb key then holding win+b at power on, unfortunately the utility to make the disk doesn't seem to work in 64 bit versions of windows, the only type I have easy access to. Anyone know a way to create the boot disk in 64?

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• XDMCP is slow any ideas? (looking for alternative remote desktops)

  - by peteri

  I've been used to using RDP on Windows to remote to machines, and I've got an asus eee 701 which I want to use to do some *nix programming on. While the eee is a lovely little machine the screen and keyboard are a little small to use for lots of programming. I've tried using Xming (the free version) to remote login into the eee from my desktop using XDMCP (or even using a ssh session as a straight X11 server and no desktop on the eee) the whole thing seems seriously slow over wifi the initial desktop takes at least 5 seconds to paint (might even be 10 seconds I haven't actually timed it). So my real question is what do other folks use for remote control with a GUI for their *nix boxes? I am finding it hard to believe the performance is so bad over a wifi network (It makes the Mac IIs I used to use a college in 1988 seem fast) or is this just a problem with Xming and using say the Cygwin X11 server would be better.

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• What is the fastest RAID in practise?

  - by Luke

  I'm going to be rebuilding my server, and I want much faster access to my data. I've used RAID 1 and 0 in the past, and decided upon RAID 10 (dedicated RAID card). Then someone told me to use RAID 5+0, then someone else told me to use RAID 6+0. Assuming the Hardware RAID Card supports each level, what is currently the FASTEST RAID available, given x number of hard drives? Reliability is now another factor, and I am willing to spend money on new drives if a drive (or multiple) fail. I simply want to know what the fastest RAID level is, along with some reliability for recovering from a failure

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• Receiving faxes on printer even while computer is shut down?

  - by Supporter13

  I normally send faxes with a very old fax machine and I was thinking it takes so much time for every fax to be scanned for all the numbers so I would like to send faxes with a printer. I already have an all-in-one printer, it can scan and print, but I have the document I want to fax on my computer already, so there is no need to scan. Now, the question is if I buy a fax capable printer, will it receive my faxes even when the computer is shut down or do I need to keep the computer on? What I really want is a way to send a lot of faxes to a lot of numbers as fast as possible (the document already in the computer through scan or sending) to be able to receive the fax in my computer (even while off) so I can print it with my printer If both are possible then what requirements do I need? Also, I could not find any info on the internet about receiving faxes on the computer.

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• App to watch installer and roll back host later?

  - by OverTheRainbow

  I'm looking for a Windows application that can watch everything an install programs does to Windows, and can roll it back to what it was like before installing an application. InCtrl5 is useful to know what an installer did, but doesn't provide a way to return the host to its previous state. I'd like to avoid having to restore a host using eg. CloneZilla just for a small application. The goal is to make it fast to test an application in a test lab. Does someone know of an application that can do this? Edit: I wasn't specific enough: I need a way to totally remove an application but keep all other changes I made after installing the application. Edit: After checking a few of them, I settled on Cleanse Uninstaller, which was capable of removing the whole of an application, although it doesn't watch when it's installed.

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• snort-mysql not starting on Ubuntu server

  - by Rsaesha

  I am following this tutorial: https://help.ubuntu.com/community/SnortIDS I've set up the database, everything has installed correctly, and I've configured the snort.conf file so it outputs to a database (with creds all filled out ok). When I run /etc/init.d/snort start, it fails but does not produce any error message other than [fail]. The last few lines of /var/log/syslog are: snort[5687]: database: must enter database name in configuration file#012 snort[5687]: FATAL ERROR: My output database line in the snort.conf file is: output database: log, mysql, user=snort password=... dbname=snort host=localhost I have tried it with the commas separating everything, putting quotes around stuff, etc. The password is only made up of letters (after I thought maybe a number was throwing it off).

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• How do you do incremental search across multiple text files in VIM?

  - by Alex

  Is there a way to have VIM do incremental search on text files? Vim already does incremental search within the currently open file. Examples of programs that demonstrate the type of search I'm trying to accomplish are Notational Velocity for MacOS, Resop for windows or SimpleNote for the web. These apps do an instant or incremental search in the files of a specific directory and make it easy/fast to narrow down the file you are looking for or create a new file. I use both but would rather live in one editor.(that being VIM) Is there some plug in that would do this?

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• Windows 8 taking 4+ mins to shutdown

  - by arnab321

  I did a fresh installation of Windows 8 64 bit, build 9200 (released on aug 16th). I installed the drivers and some basic softwares like NetBeans, mingw, iis server and php. For the first few times, it was restarting normally. But then at shutdown, it would show the shutdown screen for some seconds and then turn black for about 4 mins (similar to what happens at hibernation). I disabled the "fast startup" option in power options, but the problem still persists. Windows 7 and Ubuntu shut down normally. specs: 4gb ram, 750 gb sata hdd, solved by installing Windows Updates released during October. It was a serious bug in the OS, afaik. Now even hibernate takes upto 30 secs max. Still, win 8 is too buggy for release.

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• Hosts file in Apache keep changing for OS Linux Redhat [on hold]

  - by jack f

  I have installed Apache server. Two clients ex client_1 and client_2. The operation that we are performing on client_1 reflecting to client_2. We have etc/hosts file in our software install location which is keep on changing for client_2 with client_1 IP address. If I correct the entries in hosts file to client_2 also in the next few minuets it is changing automatically to the client_1(if we start the client_1 service). Please explain the use of hosts file and where and when it will change by Apache service. The hosts file in the location /etc/hosts/ for the both clients are same ============================================= Do not remove the following line, or various programs that require network functionality will fail. 127.0.0.1 localhost.localdomain localhost Local LAN 190.0.0.1 client_1.Example.com client_1 190.0.0.2 client_2.Example.com client_2 HR LAN 10.1.74.2 client_1hr peer 10.1.74.3 client_2hr ESP LAN 10.69.69.1 client_1esp 10.69.69.2 client_2esp Any help will be appreciated. Thanks in advance, Jack F

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• MS Access ADP front end and SQL Server back end for field data collection?

  - by Brash Equilibrium

  I am an anthropologist. I am going to the field and will use a netbook to collect survey data. The survey forms will need to allow me to enter data into multiple tables, search tables, allow subforms, and be fast enough to not slow down my interview. I have considered storing the data in a SQL Server Express 2008 R2 server (there will be a lot of data) while using a Microsoft Access data project as a front end. To cut down the number of steps required to collect and store data, I'm considering using the netbook for both data storage and collection (after reading this article about SQL Server on a netbook). My questions are: (1) Is there a simpler solution that is also gratis (gratis because I already have a MS Access license from my workplace, and SQL Server Express is, obviously, free)? (2) Does my idea to store and collect data using the netbook make sense? Thank you.

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• Why does Mac OS X sometimes complain that a copy failed because a file is in use?

  - by orj

  Recently I've been copying files from DVDs to network storage on my Mac running Leopard 10.5.7. I'm just dragging and dropping in Finder to perform the copy. Occasionally the copy will fail with a dialog complaining that a file is in use. If I repeat the copy generally it completes successfully. I could understand this being a problem if one was trying to move a file and it was open by another app. But none of these files are open in other apps. I just pop the DVD in, drag and drop the files to my NAS's network share and sometimes it fails with the "file in use" error. This is very annoying. Anyone have any ideas?

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• Replace gvimext.dll in Windows 8

  - by Leftium

  How can I get the "Edit with ... using tabs" functionality in gVim on Windows 8 (64-bit)? I'd like to swap out gVim's stock gvimext.dll for one that adds an "Edit with ... using tabs" option to Explorer's right-click context menu. On Windows 7 (64-bit) I used to be able to download the DLL and swap it in by following these instructions. However, I can't get it to work in Windows 8. The stock installation's context menu (sans "... using tabs") works fine (without a restart) ...but after replacing the DLL the gVim context menu options disappear and the gvimext.dll no longer seems to even load. (Windows 8 was restarted) if I again replace gvimext.dll with a backup of the stock DLL, the context menu options remain missing and the DLL still seems to fail to load (Windows 8 was restarted, again) If I re-install gVim, the context menu items return (even without a restart) What is the difference here between Windows 7 (where swapping DLL's works) and Windows 8 (where swapping DLL's fails)?

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• A space-efficient filesystem for grow-as-needed virtual disks ?

  - by Steve Schnepp

  A common practice is to use non-preallocated virtual disks. Since they only grow as needed, it makes them perfect for fast backup, overallocation and creation speed. Since file systems are usually based on physical disks they have the tendency to use the whole area available1 in order to increase the speed2 or reliability3. I'm searching a filesystem that does the exact opposite : try to touch the minimum blocks need by an aggressive block reuse. I would happily trade some performance for space usage. There is already a similar question, but it is rather general. I have very specific goal : space-efficiency. 1. Like page caching uses all the free physical memory 2. Canonical example : online defragmentation 3. Canonical example : snapshotting

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• UsrClass.dat does not load, any ideas on what to check?

  - by Bob Simmons

  I have an odd problem where one of my users' UsrClass.dat hive does not load, which causes .NET ClickOnce applications to fail to start. They are one of several users on a Windows 2000 terminal server, all the others have no problem. Nothing is mentioned in any logs. I can manually load the hive to the correct HKEY_USERS\..._Classes location using REGEDT32, which works around the problem, but I've no idea what could be causing this in the first place. Any ideas what to check here, or any diagnostic tools or procedures that would help?

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• Sudden slow read & write speed on all IO

  - by user23392

  I have a custom built rig that has 2 storage drives. for OS: Western Digital 1.0TB HARD DR 64MB for other stuff: Corsair Performance 3 128GB (SSD) [ expected read speed: 400 mb/s ] The system was incredibly fast for a couple of months, then one day i was playing a game then it started to get buggy (some sounds and objects disappearing), i stopped the game and the system seemed to be unstable so i had to shut it down, next morning i couldn't start it up, it was saying something about corrupt device. I formatted both disks and installed a fresh copy of windows, all i can say that since that day the system was never like before, it takes 10 minutes to boot up (the icons and desktop slowly appear). but once it's done the slowness isn't as noticeable. Here's my benchmark on the HDD ( read speed - write speed ): And the SSD: Anyone knows what could be the issue?

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• The good SQL database to process a lot of data?

  - by Dorian

  I have to process like 10-100 millions records. I have to give the data to the client when it's finish. The data is givent as SQL requests to execute in the database. He have a powerful server with MySQL, I think it will be fast enough. The issue is my computer is not as powerful as his server, so I would like to use an other SQL server who is compatible (I export his database and import it in my computer) with MySQL but more powerful. What should I use? Or am I doomed to use MySQL?

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• Why doesn't openSUSE Linux upgrade itself through its software repositories?

  - by Dougal

  openSUSE - fast becoming my favourite Linux distro on the client - doesn't seem to upgrade itself through its own configured software repositories. Do we know why this is the case? Is it a money-making thing where they can then sell upgrade CDs / DVDs? I mean, pretty much every other Linux upgrades itself through the normal software repositories. For example, Ubuntu can upgrade itself from 10.4 to 10.10 just through the normal software package upgrade procedure. Why must it be a huge procedure to upgrade openSUSE? Any knowledge or ideas appreciated. Thank you.

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• using one disk as cache for others

  - by HugoRune

  Hi Given a PC with several hard drives: Is it possible to use one fast disk as a giant file cache? I.e. automatically copying frequently accessed data to that one disk, and transparently redirecting reads and writes to that disk, so that other drives would only have be accessed occassionally. (writes would have to be forwarded to the other disks after a while of course) Advantages: the other drives could be powered down most of the time; reducing power, heat, noise speed of the other drives would not matter much. cache disk could be solid state. How can I set such a system up? What OS supports these options? Is this possible at all using Windows or Linux?

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• Can I set Windows default second-monitor behaviour to "Extend these displays"?

  - by MT_Head

  I travel to multiple offices (and multiple desks in those offices), and whenever possible I plug an external monitor into my laptop. Whenever I plug in a monitor I haven't used before, Windows defaults to "Duplicate these displays" - which messes up the arrangement of icons on my desktop if the external monitor is a different shape from my laptop's monitor. I then select "Extend these displays", and my laptop screen returns to its original shape - but my icons don't go back to their original arrangement. Grrrrr. Fast-forward a few days or weeks; I've got my icons arranged so I can find stuff again - then I go to a new office and it starts all over again. I'm tired of this. Is it possible to make "Extend these displays" the default behavior? I'm using Windows 8 x64 Home Premium, but I had the same complaint under Windows 7 x64 Ultimate. (Prior to that, I hadn't discovered the joy of dual displays. Ah, the time I wasted...)

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• What can I do to configure my SSH such that it pauses for a flaky connection?

  - by kfmfe04

  I run ssh from OSX to a Ubuntu box - under home WIFI, everything works perfectly. However, when I ssh from certain external networks, ssh may be working fine for a minute or two and then drop due to a flaky network (diagnosed by pinging 8.8.8.8). How can I set up ssh so that it simply waits/pauses rather than drop (when dropping, I have to setup my development environment from scratch - a big hassle). EDIT When I say a bad connection, I mean, for example, ping 8.8.8.8 will work fine for a while, and then fail for 40-50 pings, and then come back on again.

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• How can I tell if my live web-server is overloaded?

  - by Nick G

  We have a live webserver which doesn't seem to be performing all that well. It's a Dell PowerEdge machine, a few years old (dual core, 4GB) which is hosting about 20 low-traffic websites. However it doesn't seem to be as fast as it used to be. How can we determine the cause of this? If it's website traffic, I would be expecting high CPU but CPU usage is quite low and hovers around the 15-30% mark except for very brief periods. I'm wondering perhaps, if rather than CPU performance being a problem, perhaps it's disk thrashing due to the constant read/writes of all the small web files and database queries. It has 4x 7200 RPM SATA drives in RAID 5. So is there a way to check that it's not disk thrashing?

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• getting a weird error whenever I try restarting apache

  - by Binny Zupnick

  I'm trying to install apache, php5, mysql, and phpmyadmin. And I'm following a tutorial but this error keeps happening here's the error: apache2: Syntax error on line 227 of /etc/apache2/apache2.conf: Could not open configuration file /etc/phpmyadmin/apache.conf: No such file or directory Action 'configtest' failed. The Apache error log may have more information. ...fail! I've tried removing all of them and reinstalling but, to no avail. I'm pulling my hair out over this so, thanks in advance! =) edit: during the tutorial I screwed up and deleting something, lol, so I know that's the issue I just don't know what to do about it now

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• How can I combine 30,000 images into a timelapse movie?

  - by Swift

  I have taken 30,000 still images that I want to combine into a timelapse movie. I have tried QuickTime Pro, TimeLapse 3, and Windows Movie Maker, but with such a huge amount of images, each of the programs fail (I tried SUPER ©, but couldn't get it to work either...?). It seems that all of these programs crash after a few thousand pictures. The images I have are all in .JPG format, at a resolution of 1280x800, and I'm looking for a program that can put these images into a timelapse movie in some kind of lossless format (raw/uncompressed AVI would be fine) for further editing. Does anyone have any ideas, or has anyone tried anything like this with a similar number of pictures?

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