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• Recovery disk Windows 8 HP Pavilion g6

  - by fpghost

  I recently purchased a HP Pavilion g6 laptop running Windows 8. I want to either obtain the Windows 8 ISO or make some kind of recovery disk that would allow me to restore the system if things go wrong. The HP Pavilion comes with the 'HP Recovery Manager' which I thought may do the job, but on running it and putting in a DVD-R as requested it seems to just hang for a number of hours without doing a thing (the disk sounds like it's spinning for a few minutes but then goes silent). I then tried 'recdisc.exe' but I get the error System Repair could not be created The device reported unexpected or invalid data for a command. (0xC0AA02FF) Next I obtained my Windows 8 product key using the software ProduKey thinking this would allow me to go to the Microsoft website and download the Windows 8 ISO, but as far as I can tell all that is available is the upgrade which can be used if one is running something like Windows 7. Can anyone advise? EDIT: after a reboot recdisc.exe did work; I think the problem was due to some Windows updates needing a reboot, but never the less I would like a full Windows 8 ISO if possible.

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• Ubuntu 10.10 - PC shutdown before boot shortly after BIOS loads

  - by clem

  Hi - Since installing Ubuntu 10.10 from Karmic I've started getting problems with starting up the PC. I've done a complete wipe (Boot and Nuke) of the hard drive and reinstalled Ubuntu 10.10 but the problem still occurs. There is no dual boot on the PC, just Ubuntu. Here is the problem: Each morning, when I turn the PC on from being off overnight, the PC starts up and loads the BIOS. I get the following message : "Verifying DMI Pool Data... K8 NPT Data Change...Update New Data to DMI!....... Then poof the computer shuts off. However, after switching the computer back on around 6 or 7 times after it's turned itself off, it will eventually boot up without any problem. Also, once up and running for a while, I can shutdown and restart the PC first time, without any issues. I have also noticed a problem with the USB mouse being recognised and once I finally get the computer booted up, I need to unplug and then plug the mouse back in to get it working. I've opened the PC up and checked the connections (cables, cards and memory) and it all seems fine. The main issue with troubleshooting this problem is I cannot test any suggestions or fixes until the next morning because once the computer is up and running it will remain so! I do not leave the computer on overnight to save energy. So.. is this a hardware / boot software issue? This is a very odd problem and I have googled to no avail. Any suggestions? Many thanks Clem

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• Are there tools available for trimming PDF margins?

  - by Charles Duffy

  I have an ebook I'm trying to read in PDF format on a Kindle. Unfortunately, the page headers and footers have some content (page number and copyright info, respectively) preventing the device from scaling the actual text to match its usable area viewing area, thus leaving the actual content too small to read. Various tools are available which will trim off whitespace, but the Kindle already does this; my goal, by contrast, is to remove printed matter outside of a defined bounding box, and the only tool I've found for the purpose is moderately expensive commercial software. I could probably generate a mask in Inkscape; split out the individual pages using pdftk, apply the mask to each page individually (outputting to postscript), and recombine the numerous postscript files into a single PDF. However, this decode/reencode steps would be pretty unfortunate in terms of document size; something able to operate with a bit more finesse would be ideal. I have all major operating systems handy (Windows, several modern Linux distros, a Mac, etc) so solutions don't need to be constrained by platform. Suggestions? (I've reported the issue to the author, who mentioned it to his editor, who hasn't done anything about the issue over the course of more than a month, making the zero-work approach evidently nonproductive).

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• Fixing Windows install by connecting it's hard drive via USB to a different laptop

  - by Jason

  I tried to upgrade a laptop to SP3, which broke it. I later found out SP3 doesn't work on that 2002 laptop. I can't uninstall SP3, or fix SP2, because the hard drive is now not detected during setup (I've read that's the problem you get). I put the hard drive in a USB drive case and plugged it into my other laptop, and I can read (& write to) the disk okay. (The hard drive won't fit in my other laptop, so I'm using USB.) I need to get that disk back to SP2, or fix whatever files got screwed up causing the disk to not be recognized. I don't want to do a re-install as there are 80GB of files on it I need, and they won't fit on the HD of my other laptop, and also because I no longer have some of the install CDs for software on it. What do I need to do to fix that drive from my other laptop? (I don't want my working laptop (XP SP3) to get screwed with by putting an SP2 disk in the CD drive, or the non-o/s data on the other hard drive screwed with.)

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• Fixing Windows install by connecting its hard drive via USB to a different laptop

  - by Jason

  I tried to upgrade a laptop to SP3, which broke it. I later found out SP3 doesn't work on that 2002 laptop. I can't uninstall SP3, or fix SP2, because the hard drive is now not detected during setup (I've read that's the problem you get). I put the hard drive in a USB drive case and plugged it into my other laptop, and I can read (& write to) the disk okay. (The hard drive won't fit in my other laptop, so I'm using USB.) I need to get that disk back to SP2, or fix whatever files got screwed up causing the disk to not be recognized. I don't want to do a re-install as there are 80GB of files on it I need, and they won't fit on the HD of my other laptop, and also because I no longer have some of the install CDs for software on it. What do I need to do to fix that drive from my other laptop? (I don't want my working laptop (XP SP3) to get screwed with by putting an SP2 disk in the CD drive, or the non-o/s data on the other hard drive screwed with.)

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• Kindle (client) for Mac--text search or highlighting/notes?

  - by doug

  just so we're clear, i'm talking about the client/software version here--ie, that you install on your Mac or PC--not the device. The Kindle client was recently released for the Mac. I downloaded it and bought a couple of Kindle-edition books to view on this client. Astonishingly, two features i consider to be more or less essential to any ebook reader are missing in the Kindle client, either that, or i can't find them: (i) text searching; and (ii) highlighting text. First, does anyone know how to access the search feature? I'm aware of the "Go To" button at the top middle of the reader window--the options in that menu when you click the button are: "Cover", "Table of Contents", "Beginning" and "Location." "Location" requires that you type in an integer (but it doesn't correspond to page number--e.g., typing "167" brought me to the table of contents), not a search term. Second, there's a button on the upper right-hand corner of the window "Show Notes and Marks" yet i can't find any way to highlight text. The only kind of "note" or "mark" i have been able to record is to "bookmark" a page by clicking the "bookmark" button also at the top of the window.

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• Are there any benchmarks showing difference between hardware virtualisation enabled/disabled?

  - by Wil

  I have a 13" sub-laptop/large-netbook, it has an AMD Athlon Neo X2 L335, and I chose this one because it supports hardware virtualisation. In the end, I hardly do any virtualisation on it, however, when I do... it is fast. To my shock, I went in to the BIOS and saw that virtualisation was disabled! I turned this on and, I see no speed difference.... or at least none that I can tell. I do not have time to do a full set of benchmarks - and I run quite a bit of software on the host, so it wouldn't be scientific. I have searched quite a few places and I just can not find any benchmarks showing the difference of virtualisation bit enabled/disabled on the same hardware. Does anyone have any benchmarks they have seen that they can share? In addition, I know there was an uproar a while ago as Sony disable the hardware virtualisation on some models and only offer it in their higher models as a premium feature, however, apart from forcing an up-sell, are there any benefits to having it disabled e.g. battery/heat? I just can't find any information and can't work out why it would be disabled by default. Edit--- To add, The only thing I can find is that without it, you can not perform x64 virtualisation as fast. This is the only down side I can find. However, if this is the only difference, then I am still interested in the second part of the question - why offer the option to disable it?

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• What Logs / Process Stats to monitor on a Ubuntu FTP server?

  - by Adam Salkin

  I am administering a server with Ubuntu Server which is running pureFTP. So far all is well, but I would like to know what I should be monitoring so that I can spot any potential stability and security issues. I'm not looking for sophisticated software, more an idea of what logs and process statistics are most useful for checking on the health of the system. I'm thinking that I can look at various parameters output from the "ps" command and compare to see if I have things like memory leaks. But I would like to know what experienced admins do. Also, how do I do a disk check so that when I reboot, I don't get a message saying something like "disk not checked for x days, forcing check" which delays the reboot? I assume there is command that I can run as a cron job late at night. How often should it be run? What things should I be looking at to spot intrusion attempts? The only shell access is SSH on a non-standard port through UFW firewall, and I regularly do a grep on auth.log for "Fail" or "Invalid". Is there anything else I should look at? I was logging the firewall (UFW) but I have very few open ports (FTP and SSH on a non standard port) so looking at lists of IP's that have been blocked did not seem useful. Many thanks

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• Should I buy more RAM for my computer or a better CPU?

  - by Reijer The Coder

  I have recently bought a new laptop, an ASUS N56VJ-S4149H. I bought it to use it in all possible ways I could want, so that would be gaming downloading and streaming movies browsing the web and programming software. So far it has been running great but one thing annoys me a little bit. I frequently play Mount&Blade: Warband, it's a great game and you should check it out. Everything runs smoothly but only when I turn down the 'Texture Detail'. Otherwise it will lag a lot and I can't really play. Now my question is: Is this a problem of not enough RAM? At first I was really sure it was but after thinking about for a while I'm not anymore. My computer only has 4 Gigabytes of RAM and there is still a slot open. So will it improve when I buy another 8 Gigabytes? EDIT: It has an Nvidia GeForce GT 635M inside. and an Intel Core i5 3230M CPU with 2,6 GHz. Help and answers are really appreciated. Thanks to all.

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• How should I configure backup of my server?

  - by ed209

  I have just rented a dedicated server. If it helps this is the config I have: CPU1 Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz (Cores 8) RAM 15975 MB Disk /dev/sda doesn't contain a valid partition table (=> /dev/sda doesn't) Disk /dev/sdc doesn't contain a valid partition table (=> /dev/sdc doesn't) Disk /dev/sdb doesn't contain a valid partition table (=> /dev/sdb doesn't) Disk /dev/sda: 120.0 GB (=> 114 GIB) Disk /dev/sdc: 3000.6 GB (=> 2861 GIB) Disk /dev/sdb: 3000.6 GB (=> 2861 GIB) /dev/sda is a 120GB SSD. This is where I have Ubuntu/lamp installed. It's the drive that will run my site. With the account I got two other drives of 3000GB each which I really don't need but they came with the account. I figured I could use these to back up my main 120gb drive. So a couple of things I wondered were: Should I use these for backups? How should I back up. The data I want to back up is a user uploads directory full of images and the database. Everything else is either in a code repo or backed up some other way. For example, it would be nice to know there is a disk image of the 120gb drive somewhere that I can copy over should there be any problems but equally I don't mind doing a fresh install of all the software and copying over just the images and database dump. Thanks for your advice! (also, happy to not use the two other drives and backup elsewhere if it's more sensible)

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• Creating a private wiki

  - by Hand-E-Food

  I want to create a simple, private wiki, but am really struggling to find what I need. I require the following features: Private wiki. Only I will read or write it. Some formatting capability: headings, bold, italic, bullets, block quotes Wiki Viewer for Windows 7. If it comes with an editor, I need to be able to hide it. Page Editor for Windows 7. Page Editor for iPhone. Synchronize by cloud but available offline in Windows. So far, my research has led me to Markdown language. I can easily edit this as plain text using Notepad++ for Windows and Elements for iPhone. I can sync these files through Dropbox and have them available offline. What I can't find is a suitable viewer for Windows. I'd prefer to steer away from using HTML due to its verbose formatting codes. Can anyone recommend a solution for me? If need be, I'll happy to make a small one-off payment for software.

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• Isn't a hidden volume used when encrypting a drive with TrueCrypt detectable?

  - by neurolysis

  I don't purport to be an expert on encryption (or even TrueCrypt specifically), but I have used TrueCrypt for a number of years and have found it to be nothing short of invaluable for securing data. As relatively well known free, open-source software, I would have thought that TrueCrypt would not have fundamental flaws in the way it operates, but unless I'm reading it wrong, it has one in the area of hidden volume encryption. There is some documentation regarding encryption with a hidden volume here. The statement that concerns me is this (emphasis mine): TrueCrypt first attempts to decrypt the standard volume header using the entered password. If it fails, it loads the area of the volume where a hidden volume header can be stored (i.e. bytes 65536–131071, which contain solely random data when there is no hidden volume within the volume) to RAM and attempts to decrypt it using the entered password. Note that hidden volume headers cannot be identified, as they appear to consist entirely of random data. Whilst the hidden headers supposedly "cannot be identified", is it not possible to, on encountering an encrypted volume encrypted using TrueCrypt, determine at which offset the header was successfully decrypted, and from that determine if you have decrypted the header for a standard volume or a hidden volume? That seems like a fundamental flaw in the header decryption implementation, if I'm reading this right -- or am I reading it wrong?

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• Workaround for Dell "Power Supply Not Recognised" issue

  - by Haedrian

  So, I have a Dell Inspirion and the power supply port appears to be damaged. Basically when I plug it in I get a nice popup telling me that it couldn't detect that its a Dell power supply so it won't charge the battery and underclocks the system. It still works for other purposes (that is, giving power) I thought it was the actual power supply cable so I bought a new one, that worked for a while, provided I inserted it at JUST THE RIGHT angle. But now that's not working anymore, so I assume its the part which connects to the computer. The battery charging I can live without, the underclocking I can't. I'd like a way around this issue. Things I've tried: Updating the BIOS Replacing the power supply cable Inserting it at different angles Turning it off and on again Swearing at it Twisting it while inserting it So, is there a workaround somehow? I'd like to avoid taking out my soldering kit and risking permanently damaging expensive equipment if that's allright. I'm hoping for a software solution. Added: The exact model is a Del Inspirion N5010

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• How do I install Apache Portable Runtime?

  - by apache

  My Apache is installed by yum install apache And now I'm trying to install subversion server from source following instructions here. But when I try to configure,get an error: [root@vps303 subversion-1.6.9]# ./configure configure: Configuring Subversion 1.6.9 configure: creating config.nice checking for gcc... gcc checking for C compiler default output file name... a.out checking whether the C compiler works... yes ... checking for APR... no configure: WARNING: APR not found The Apache Portable Runtime (APR) library cannot be found. Please install APR on this system and supply the appropriate --with-apr option to 'configure' or get it with SVN and put it in a subdirectory of this source: svn co \ http://svn.apache.org/repos/asf/apr/apr/branches/1.2.x \ apr Run that right here in the top level of the Subversion tree. Afterwards, run apr/buildconf in that subdirectory and then run configure again here. Whichever of the above you do, you probably need to do something similar for apr-util, either providing both --with-apr and --with-apr-util to 'configure', or getting both from SVN with: svn co \ http://svn.apache.org/repos/asf/apr/apr-util/branches/1.2.x \ apr-util configure: error: no suitable apr found How do I get around this problem? BTW,will both client and server software be installed by compiling from source?

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• Huh? JDK not found? (on Windows 7 64-bit)

  - by Android Eve

  I am setting up a development environment for the latest Android 2.3 on a fresh install of Windows 7 64-bit. I first installed the 64-bit JDK 6 (jdk-6u23-windows-x64.exe). Then, I installed 64-bit Eclipse Classic 3.6 (eclipse-SDK-3.6.1-win32-x86_64.zip). Then, I proceed to install the Android SDK Starter Package: installer_r08-windows.exe. But... upon start it says: "Java SE Development Kit (JDK) not found." Why? I just installed it. Is this a mismatch between 32-bit and 64-bit? How do I solve this? Update (1): I tried setting the %JAVA_HOME% environment variable, as well as setting the Installed JREs in Eclipse, as suggested below. None of these solved the problem. It appears that I am not the only experiencing the problem, as this thread suggests: http://stackoverflow.com/questions/1919340/android-sdk-setup-under-windows-7-pro-64-bit I wonder whether there is a 64-bit version of the Android SDK. Update (2): I used the zip version instead (android-sdk_r08-windows.zip), ran android.bat, updated all SDK packages, and installed the ADT plugin (8.0.1), not before having to check: 'Contact all update sites during install to find required software'. We'll see how this goes... Update (3): It worked! (going to accept @bubu's answer shortly) -- but why doesn't the emulator include the HelloAndroid app when I run it (Ctrl+F11) from Eclipse?

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• Almost All Logical Volumes Disappeared - Recovery?

  - by Alex

  We had a hard disc crash of one of two hard discs in a software raid with a LVM on top. The server is running Citrix xenserver. On the hard disk which is still intact, the volume group gets detected well, but only one LV is left. (some hashes replaced by "x") # lvdisplay --- Logical volume --- LV Name /dev/VG_XenStorage-x-x-x-x-408b91acdcae/MGT VG Name VG_XenStorage-x-x-x-x-408b91acdcae LV UUID x-x-x-x-x-x-vQmZ6C LV Write Access read/write LV Status available # open 0 LV Size 4.00 MiB Current LE 1 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 root@rescue ~ # vgdisplay --- Volume group --- VG Name VG_XenStorage-x-x-x-x-408b91acdcae System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size 698.62 GiB PE Size 4.00 MiB Total PE 178848 Alloc PE / Size 1 / 4.00 MiB Free PE / Size 178847 / 698.62 GiB VG UUID x-x-x-x-x-x-53w0kL I could understand if a full physical volume is lost - but why only the logical volumes? Is there any explanation for this? Is there any way to recover the logical volumes? EDIT We are here in a rescue system. The problem is that the whole server does not boot (GRUB error 22) What we are trying to do is to access the root filesystem. But everything was in the LVM. We have only this: (parted) print Model: ATA SAMSUNG HD753LJ (scsi) Disk /dev/sdb: 750GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 750GB 750GB primary boot, lvm And this 750GB LVM volume is exactly what we see on top.

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• Skipping nginx PHP cache for certain areas of a site?

  - by DisgruntledGoat

  I have just set up a new server with nginx (which I am new to) and PHP. On my site there are essentially 3 different types of files: static content like CSS, JS, and some images (most images are on an external CDN) main PHP/MySQL database-driven website which essentially acts like a static site dynamic PHP/MySQL forum It is my understanding from this question and this page that the static files need no special treatment and will be served as fast as possible. I followed the answer from the above question to set up caching for PHP files and now I have a config like this: location ~ \.php$ { try_files $uri =404; fastcgi_cache one; fastcgi_cache_key $scheme$host$request_uri; fastcgi_cache_valid 200 302 304 30m; fastcgi_cache_valid 301 1h; include /etc/nginx/fastcgi_params; fastcgi_pass unix:/var/run/php-fastcgi/php-fastcgi.socket; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /srv/www/example$fastcgi_script_name; fastcgi_param HTTPS off; } However, now I want to prevent caching on the forum (either for everyone or only for logged-in users - haven't checked if the latter is feasible with the forum software). I've heard that "if is evil" inside location blocks, so I am unsure how to proceed. With the if inside the location block I would probably add this in the middle: if ($request_uri ~* "^/forum/") { fastcgi_cache_bypass 1; } # or possible this, if I'm able to cache pages for anonymous visitors if ($request_uri ~* "^/forum/" && $http_cookie ~* "loggedincookie") { fastcgi_cache_bypass 1; } Will that work fine, or is there a better way to achieve this?

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• Network card shuts down when stressed

  - by user142485

  I have a network card that functions fine with light use, but quits functioning after heavy use. I replaced it with a brand new one and still have the same issue, also updated drivers. It is a wired D-Link card. The Internet seems fine for a small amount of web browsing but when I run a bandwidth test it starts out fast and slows quickly until the card completely quits; I have a constant ping of the gateway going while I run this and it starts timing out after a couple seconds into the speed test. The card will stay on and the data light on it still flashes some but I cannot ping the gateway or anything else until the computer is rebooted. When I boot into safe mode I can browse and run the speed test fine with no problems. I am guessing that this is probably some program that is loading in regular mode but not safe mode that is causing the issue? I have very limited software (turned off av and firewall) on the computer but I am thinking that I'll just have to start eliminating start-up programs and see if that helps. This is on Windows 7 if that makes any difference. Anyone had a similar issue or have any other suggestions/ideas for narrowing down this problem?

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• How do I connect to and factory reset a Catalyst 3560 Switch?

  - by Josh

  My company just bought another company. In their server room they had some older hardware, which I would like to repurpose. One of these is a Cisco Switch: C3560G-48TS-S. I found some instructions about this switch here but this is not a guide for a beginner. I have no idea how to connect to this thing to begin running the commands. It says Configure the PC terminal emulation software for 9600 baud, 8 data bits, no parity, 1 stop bit, and no flow control. But I can't find anything on how to do this (assuming with telnet?) or even what program to use. I also don't know how to find the IP address of the device to connect to it. My research also says once I get in there, I need to run clear config all Is this the right command? Also, what if I can't get the username and password for these devices? Is there some way to factory reset (my only experience is with devices that have a hardware reset button) EDIT: I should note that when I push the button on the front the three lights blink, which according to the documentation indicated the switch is configured and "not available for express setup"

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• Arduino IDE "launch 4j" error

  - by John

  I have a computer running Windows XP. I am trying to run the Arduino IDE 0022. I double-click on arduino.exe, it waits about 30 seconds on the load up title screen, and then it gives me this error: Launch 4j: an error occurred while starting the application My only choice is to click "OK"; the error goes away, and the Arduino IDE closes. If I try to delete the Arduino files (to try overwriting with some different files), I get an error that doesn't allow me to do so: Cannot delete awt.dll: Access denied Make sure the disk is not full or write protected and that the file is not currently in use. The only way to delete the file is by restarting the computer. So something must still be trying to run after that first error. I have noticed in Task Manager that some Java programs are still running: javaw.exe (3 processes) I think this is a problem with Java, but I checked and updated all of my Java software and it is all up to date. I have looked on other forums for this issue and none of them seemed to help. From the forums I have tried: Different Arduino IDE versions Updating Java Opening arduino.exe as Administrator Nothing has worked. Anyone have any suggestions?

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• Datastage 8.7 installs fine on Window7 without any errors but it can not launch localhost:9080 web console

  - by user265273

  When I launch the web console, I get page can not be displayed error. What I have tried so far: I have re-installed DS about 7 times, and each time, I get same errors. I added entries in etc/hosts file for local host and my host name. I have turned off firewall. My hardware/software setup. My host system is window8.1. My vmware workstation is 7. The guest os is windows 7 enterprise x64. I have installed 10g, and given dba role to public. I have installed VS 5, and ms visual c++ 2010 express. I have installed msxml. IE version is 10. Firewall is off. My internet works fine It passed all the DS requirement tests and install completed successfully. When I launch my vmware guest instance, I do get SQL5000c error upon boot which I have tried to ignore in some installs and in some, I used db2systray -clean command to get rid of it. But that has not helped solve the webconsole connect failure to my host. I have spent over 2 weeks exclusively on this issue and badly need some help.

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• Using multiple USB webcams in Linux

  - by rachelderp

  Running more than one USB webcam in Debian/Linux results in the the following error: libv4l2: error turning on stream: No space left on device VIDIOC_STREAMON: No space left on device What initially seemed to be a programming issue in OpenCV turned into a quest for a mysterious hardware/software problem after the same errors were produced by running cheese and xawtv. Apparently it's caused by webcams requesting all the available bandwidth on the USB host controller. With that in mind I decided to run wireshark and capinfos to see just how much bandwidth a single camera used. 4 megabits per second at 320x240 14 megabits per second at 640x480 32 megabits per second at 1920x1080 Interesting! That might explain why two cameras at 320x240 work but any higher resolution fails. It's as if my USB controller is only operating at USB 1 speeds, yet lsusb shows both webcams belonging to a device which supposedly supports 480 megabits per second. One solution proposed forcing the webcams to calculate their bandwidth usage instead of requesting their maximum by running the following commands: sudo rmmod uvcvideo sudo modprobe uvcvideo quirks=128 Unfortunately that made no difference, so I decided to try another solution. A post on StackOverflow suggested telling my webcams to use a lower FPS or compressed video format like MJPEG, but after running v4lctl list it doesn't appear either of my webcams support changing their video mode. And that's where I'm stuck. Why would two webcams operating well below the maximum speed of USB 2 would produce this error? ps: It's not a disk space issue, df displays no change when the webcams are started. pps: If it makes a difference, here's the output of lsusb

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• Calculating memory footprints using /proc/sysvipc/shm

  - by MarkTeehan

  This is for a SLES 10 database server. One of my servers runs three databases and three app servers; I am analyzing how their shared memory segments grow and shrink to avoid intermittent out-of-memory scenarios. "Top" is hot helpful for this since its calculations for RES and VIRT are inconsistent. I am doing this by matching up the contents of /proc/sysvipc/shm with memory usage reported by the database admin console. I do this by totaling up saving the contents of /proc/sysvipc/shm and then total up "bytes" for all of the segments for the offending userid. This is a large server with hundreds of segments and tens (or hundreds) of GB of allocated memory per userid. However it doesn't match up - the database management software claims to be using around 25% more memory than the total I calculate. Negligible swap space is in use, so I am ignoring that. I am running it as root so I am sure I see all shared memory segments. My question is : is all (significant) allocated memory recorded in /proc/sysvipc/shm, or is this only shared memory (*and not "un-shared" memory?). If this is incorrect, what is the correct way to calculate out the total allocated memory for each userid? Also: I believe doing a 'cat' on this file locks server IPC. I check it every 5 seconds - is it likely that this frequency could be problematic? Thanks! Mark Teehan Singapore

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• Despeckle line art

  - by Dour High Arch

  We have a number of line-art charts unfortunately saved as JPEGs. They are now riddled with distracting compression artifacts or "speckles". Is there any way of removing these? I do not have the original files and it will be very difficult to recreate them. I am running Windows 7 and tried Paint.Net; none of the filters help. Posterize washed out all the colors and leaves the speckles. Blur makes text unreadable. Noise Reduction wrecks antialiasing of curved lines, and perversely enhances the speckles, making them look like checkerboards. Yes, I have Googled for software to do this; there are many programs that advertise despeckling but, after my experience with Paint.Net, do not want to experiment with applications that show no before and after images. The only example I have seen that does what I want is from a Photoshop tutorial. I have dozens of files and the tutorial requires considerable manual fine-tuning. I would prefer to automate or batch-process this task. Commercial apps are fine, but I do not want to spend over $600 and learning a complex program for a single task.

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• Why is my rsync so slow?

  - by iblue

  My Laptop and my workstation are both connected to a Gigabit Switch. Both are running Linux. But when I copy files with rsync, it performs badly. I get about 22 MB/s. Shouldn't I theoretically get about 125 MB/s? What is the limiting factor here? EDIT: I conducted some experiments. Write performance on the laptop The laptop has a xfs filesystem with full disk encryption. It uses aes-cbc-essiv:sha256 cipher mode with 256 bits key length. Disk write performance is 58.8 MB/s. iblue@nerdpol:~$ LANG=C dd if=/dev/zero of=test.img bs=1M count=1024 1073741824 Bytes (1.1 GB) copied, 18.2735 s, 58.8 MB/s Read performance on the workstation The files I copied are on a software RAID-5 over 5 HDDs. On top of the raid is a lvm. The volume itself is encrypted with the same cipher. The workstation has a FX-8150 cpu that has a native AES-NI instruction set which speeds up encryption. Disk read performance is 256 MB/s (cache was cold). iblue@raven:/mnt/bytemachine/imgs$ dd if=backup-1333796266.tar.bz2 of=/dev/null bs=1M 10213172008 bytes (10 GB) copied, 39.8882 s, 256 MB/s Network performance I ran iperf between the two clients. Network performance is 939 Mbit/s iblue@raven $ iperf -c 94.135.XXX ------------------------------------------------------------ Client connecting to 94.135.XXX, TCP port 5001 TCP window size: 23.2 KByte (default) ------------------------------------------------------------ [ 3] local 94.135.XXX port 59385 connected with 94.135.YYY port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 1.09 GBytes 939 Mbits/sec

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