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• kernel software trap handling

  - by Tony

  I'm reading a book on Windows Internals and there's something I don't understand: "The kernel handles software interrupts either as part of hardware interrupt handling or synchronously when a thread invokes kernel functions related to the software interrupt." So does this mean that software interrupts or exceptions will only be handled under these conditions: a. When the kernel is executing a function from said thread related to the software exception(trap) b. when it is already handling a hardware trap Is my understanding of this correct? The next bit: "In most cases, the kernel installs front-end trap handling functions that perform general trap handling tasks before and after transferring control to other functions that field the trap." I don't quite understand what it means by 'front-end trap handling functions' and 'field the trap'? Can anyone help me?

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• How can I rip a DVD but merge/join episodes

  - by Nifle

  Some background. I have the Pink Panther Collection, they have about 30 episodes on each DVD. Now I want to watch this on my $MobileDevice. So I went and converted it to m4v or avi. This of course went splendid with both Handbrake and AutoGK but the problem is that I want ONE file per DVD, both Handbrake and AutoGK creates one file per episode. So here finally is my question. Does anyone know how to persuade Handbrake or AutoGK to create one video file with all the episodes? Or can anyone recommend another (free/cheep) tool for the job? Oh and no cheating by telling me to join the files after conversion. I have never found a video joiner that did not disappoint me (usually bad audio sync).

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• Run application or script on Windows RDC connection

  - by NickLarsen

  I checked this thread, but it did not solve my exact problem. I need to run a script on when a connection is made across my network using windows remote desktop connection. The thread listed above works for the initial login, however, if I don't log out (which is necessary for some processes running on my network), then it wont run the script again the next time someone connects to the system using remote desktop connection. Previously we were using pcAnywhere to achieve this, however after running into some graphical issues with pcAnywhere, we have decided to move away from it to RDC. For a little more information, we need to have an email sent out anytime a connection is made to particular machines. The login name will always be the same for those systems and we do not log off when closing the connection.

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• How many times can data be read from a USB flash drive?

  - by John

  While I am aware that performing writes on a USB flash drive degrades the life expectancy of the device. I have heard the quantity of writes is anywhere from 100 thousand to 10 million, but I have not heard about number of read operations. Does reading from the device count toward this total? I am interested in writing only once to a flash drive and setting it to read-only. Then reading files from the device a thousand or more times per day, but am wondering if (at say 1,000 reads per day), the flash drive will need to be replaced within 100 days (assuming a 100,000 r/w cycle lifetime)?

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• How to calculate power/energy taken by computer and screen

  - by r0ca

  I need to investigate how much power my linux machine uses per week. I can take a look at the PSU but I would like to know how to calculate the average use of power it takes. I also need to know how much power a CRT screen use per week. Do I need to check the PSU Watt unit and Screen Watt usage and just add both to have the results? P.S. My english is not good, sorry about that! P.P.S. My question is not related to: http://superuser.com/questions/9946/how-to-choose-a-ups-calculate-power-for-a-new-pc

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• Excel: count number of unique/distinct row in range with condition

  - by Bertvan

  I have a an excel sheet with: in Col A: week numbers in Col B: dates (timesheet entries) I need to know the number of days worked for each week, so I need to the number of unique date entries per week number. I found formula's (both array as non-array) that handle this for a fixed range, but I want to have the results in another column per week number. So, the result of the added dataset below would be (the colon is just for clarity): 14: 2 15: 3 17: 6 20: 2 21: 3 If this is the source data: 14: 4/04/2012 14: 4/04/2012 15: 10/04/2012 15: 10/04/2012 15: 11/04/2012 17: 26/04/2012 17: 26/04/2012 17: 26/04/2012 17: 26/04/2012 17: 27/04/2012 17: 27/04/2012 20: 14/05/2012 20: 14/05/2012 21: 23/05/2012 21: 23/05/2012 21: 25/05/2012

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• Good fractal visualizer

  - by Gnoupi

  Each time it's the same thing, I find one, then I forget the name of it the next time I want to "dive" into such things. I'm looking for a good fractal "visualizer". The kind in which you just select a well-known fractal model (or variations on it), and in which you can then "dive" into, just zooming in or out smoothly, for the cheer pleasure of losing yourself in it. I'm looking for an executable, preferably for Windows, but any OS accepted. Keep to one program per answer (and one answer per program), as this is community wiki.

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• Setup mutt to read through a threaded message and then return to the email index

  - by dat5h

  I have begun using mutt (terminal email client) recently and I have it setup very nicely and easy to use. My only gripe is that sometimes it is difficult to tell when I transition from one thread to the next. Is it possible to setup the bindings such that moving to the next-undeleted message would check if the next-undeleted message is in the same thread, and if that check is false it returns to the index or throws an error? For example, I currently have bind pager <down> next-undeleted bind pager } next-subthread Is there a more advanced function call that could perform this check? I haven't been able to find much on how to perform more complex function calls with such checks while checking out the manual. Any help would be appreciated.

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• Virtualized CPU cores vs. threads

  - by nedm

  We've got a KVM host system on Ubuntu 9.10 with a newer Quad-core Xeon CPU with hyperthreading. As detailed on Intel's product page, the processor has 4 cores but 8 threads. /proc/cpuinfo and htop both list 8 processors, though each one states 4 cores in cpuinfo. KVM/QEMU also reports 8 VCPUs available to assign to guests. My question is when I'm allocating VCPUs to VM guests, should I allocate per-core or per-thread? Since KVM/QEMU reports the server has 8 VCPUs to allocate, should I go ahead and set a guest to use 4 CPUs where I previously would have set it to use 2 (assuming 4 total VCPUs available)? I'd like to get the most possible out of the host hardware without over-allocating.

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• Why did cherokee-admin-launcher crash?

  - by DarenW

  I'm trying out the Cherokee http server on a seemingly fine machine. Following simple set-up instructions, I tried running cherokee-admin-launcher but it printed error messages and hung up. Ctrl-C did not kill it; I had to kill -9 it from another xterm. OTOH, cherokee-admin ran fine (or at least got a lot further). What is the problem with python and cherokee-admin-launcher, and how to fix it? [root@iron rc.d]# cherokee-admin-launcher Checking TCP port 9090 availability.. OK Launching: LD_LIBRARY_PATH=/usr/lib /usr/sbin/cherokee-admin Exception in thread Thread-1: Traceback (most recent call last): File "/usr/lib/python2.7/threading.py", line 530, in __bootstrap_inner self.run() File "/usr/bin/cherokee-admin-launcher", line 209, in run return self._run_guts() File "/usr/bin/cherokee-admin-launcher", line 217, in _run_guts env=self.environ, close_fds=True) File "/usr/lib/python2.7/subprocess.py", line 672, in __init__ errread, errwrite) File "/usr/lib/python2.7/subprocess.py", line 1202, in _execute_child raise child_exception OSError: [Errno 2] No such file or directory ^C ^C

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• Using Lighttpd: apache proxy or direct connection?

  - by Halfgaar

  Hi, I'm optimizing a site by using lighttpd for the static media. I've found that a recommended solution is to use Apache Proxy to point to the lighttpd server. But, does that use up an Apache thread/process per request? In my setup, I've noticed that all my processes are used up, even though they aren't doing anything, CPU wise. To free up apache processes, I've configured lighttpd and the amount of processes needed is lowered significantly, Munin shows. However, I've set it up to connect directly to lighty, to prevent apache workers from being occupied by serving static media. My question is: when using Apache Proxy, does that also use up a process/worker per request?

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• IIS 7.x Application Pool Best Practices

  - by Eric

  We are about to deploy a bunch of sites to some new servers. I have the following questions about application pools: 1) It seems advisable to have an application pool per website. Are there any caveats to this approach? Can one application pool, for example, hog all the CPU, Memory, Etc...? 2) When should you allow multiple worker processes in an application pool. When should you not? 3) Can private memory limit be used to prevent one application pool from interfering with another? Will setting it too low cause valid requests to recycle the application pool without getting a valid response? 4) What is the difference between private and virtual memory limits? 5) Are there compelling reasons NOT to run one application pool per site? Thanks!

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• Change Win7 desktop background via Win2k3 Group Policy

  - by microchasm

  I'm experiencing some strange behavior: I have set the following policies: User Configuration\Administrative templates\Desktop\Active Desktop Enable active desktop [enabled] Active Desktop Wallpaper [set to local path -- quadruple checked; path is correct] Allow only bitmap wallpaper [disabled] gpupdate /force, log out, log back in, and the background is just black. If I go into themes, and select Windows 7, the appointed background then shows (it also flashes when logging out). gpresult I've tried: http://social.technet.microsoft.com/Forums/en/winserverGP/thread/a1ebfe81-421e-4630-8c1f-8068222ee533 http://support.microsoft.com/default.aspx?scid=kb;EN-US;977944 http://social.technet.microsoft.com/Forums/en/w7itproui/thread/5b9e513a-d504-451d-a121-b4f94893d96d and a few other things, but nothing seems to be working :/ Thanks for any help/tips/advice.

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• How accurate is apache benchmark?

  - by matthewsteiner

  Alright, so I'm in development right now and I'd like to understand exactly how good the benchmarks are. I've just been using apache benchmark. Do they include the server sending the files? Also, is "requests per second" literally how many users can visit the page within one second? If it's at 30 requests per second, can literally 30 people be refreshing pages every second and the server will be fine? It seems like a lot to me. I know a lot of people get way better stats out of their servers, but I haven't done much optimization yet. Also, will increasing your ram increase you rps linearly? I have 512mb, so if I upgrade to 1gb, would that mean I'd get about 60 rps? How does concurrency affect your rps?

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• How can I configure MediaWiki to display numbers in titles?

  - by Wikis

  We would like to display numbers in the titles in our MediaWiki wiki. Specifically: in the table of contents numbers are shown like this: 1 Title 1.1 Subtitle 2 Another title However, on the page the titles (that map to the table of contents) appear like this: Title text Subtitle text Another title text That is, no numbers are shown. How can we show numbers in the page contents? There are three possible ways that this could be answered (that I can think of). In our order of preference, they are: Setting per user Setting per page Global setting (for all users)

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• Must have iPad apps [closed]

  - by Michael Ellick Ang

  What apps would you install/buy once you purchase an iPad ? One app per answer please.

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• Windows 7 The boot selection failed because a required device is inaccessible 0xc000000f

  - by piratejackus

  I have a problem with my Windows 7, hardware : Acer 3820TG Operating Systems : Windows 7 and Ubuntu 10.04 dual Case: When I try to boot my windows 7 I see an error: "Window failed to start. A recent hardware or software change might be the cause. To fix the problem: 1.Insert.... 2. .... ... status : 0xc000000f info : The boot selection failed because a required device is inaccessible .... " I can't exactly remember what were my last actions on Windows. I already searched this error and applied the proposed solutions, I created a repair USB (because I don't have a CD-ROM nor a Windows 7 CD) such as; -repair operating system :it says it cannot repair it -checking disk (chkdsk D: /f /r) : it checks the disk without a problem or error and it takes pretty long (more than a hour). But when I restart, still the same error. -I didn't create a restore point so I pass this option -I don't have a system image -I tried to run windows recovery (I have a recovery partition) but there are just two options: 1- Format the operating system but retain user data (copies the files under users to c\backup folder, but when I searched deeper I found that there are some people who already tried this option and couldn't find their user files under backup directory). Plus, I have unfortunately just one partition D (it is a fault I know) because I use always Ubuntu. So this is not applicable in my situation 2- Format entire system (Windows). I keep my valuable data in windows but not in user folder. I was reaching them from Windows. -I tried to repair windows boot by: bootrec /fixMBR bootrec /fixBoot bootrec /rebuildBCD I lost all grub menu, and reinstalled it. - ubuntuforums.org/showthread.php?t=1014708&page=29 nothing changed, same error. I created a thread in microsoft forums - http://social.answers.microsoft.com/Forums/en-US/w7install/thread/69517faf-850a-45fd- 8195-6d4ed831f805 but I couldn't find a solution. Before I run chkdsk from usb repair disk I couldn't able to mount Windows (NTFS) partition from Ubuntu, I was getting "couldn't mount file system, error code 2". I tried to fix ntfs partition from ubuntu and got "segmentation fault". I also created a thread on ubuntuforums for this mount problem: - http://ubuntuforums.org/showthread.php?t=1606427 So, after chkdsk, I could enable to mount windows partition but all I see in this partition is chkdsk logs, no any other data. Now, I don't think I lost my data because I don't get any filesystem errors, just the boot section, but this log files under windows partition makes me afraid. I see that Microsoft developers don't have a solution yet for this error. If you need any information to get more idea I can give, maybe I miss some points or it could be complicated. Thanks in advance.

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• Windows7 IIS7: zips don't have php5isapi.dll Can I use php.dll instead?

  - by Pete Alvin

  The page: How to Install PHP 5.2 on IIS 7and Windows Vista (and a few others) reference a mysterious php5isapi.dll which is not in the Windows install, or the zip files: php-5.3.2-Win32-VC9-x86.zip - VC9 x86 Thread Safe php-5.3.2-nts-Win32-VC9-x86.zip - VC9 x86 Non Thread Safe There was another post on stackoverflow that said it's obsolete and replaced by "fastapi" but no instructions mention this. I did find a php.dll in the zip file. Can I use that instead of php5isapi.dll? It's very frustrating trying to install basic PHP5 on Windows with MySQL.

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• Would it be smarter to setup a Linux development server at home, or to use a hosted server?

  - by markle976

  I am in the process of learning as much as I can about LAMP. I was wondering if I should set a web server on my home network, or use a service like Rackspace (cloud space)? I need to have root access, to be able to access it remotely via SSH/FTP/HTTP, and to be able to install things like subversion, etc. I currently have Comcast so I have plenty of bandwidth, but I am not sure if this would violate the TOS, and/or compromise the security of my home network. Pricing for these cloud hosts, seems reasonable ($11 per month plus about $0.10 per GB of bandwidth), but I am not sure if I will have to control I am looking for.

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• apache and ajp performance

  - by user12145

  I have an apache sitting in front of two tomcat app servers(one on the same physical server, the other on a different one) that does time consuming work(0.5 sec to 10sec per request). The apache http server is getting killed by an average of 1 to 2 concurrent requests per second. both Server spec is about 2GB of RAM. Is there a way to optimize apache to handle the load? any advise is welcome. BalancerMember ajp://localhost:8009/whoisserver BalancerMember ajp://XXX.XX.XXX.XX:8009/whoisserver I keep getting the following in apache2.2 log: [Mon Dec 28 00:31:02 2009] [error] ajp_read_header: ajp_ilink_receive failed [Mon Dec 28 00:31:02 2009] [error] (120006)APR does not understand this error code: proxy: read response failed from 127.0.0.1:8009 (localhost)

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• Anti-spam measures for websites

  - by acidzombie24

  What are anti-spam measure I should consider before launching my user content website? Some things I have considered: Silent JavaScript based CAPTCHA on the register page (I do not have an implementation) Validate emails by forcing a confirmation link/number Allow X amount of comments per 10 minutes and Y per 2 hours (I am considering excited first time users who want to experience the site) Disallow link until user is trusted (I am not sure how a user will become trusted) Run all comments, messages, etc. through a spam filter. Check to see if messages are duplicate or similar (I may not bother with this. I'd like the system to be strong without this) I also timestamp everything which I then can retrieve as a long on my administrator page. What other measures can I take or consider?

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• Some Mac applications crash frequently, with "__THE_SYSTEM_HAS_NO_PORT_SETS_AVAILABLE__" in backtrace

  - by smokris

  Recently I'm finding that some Mac OS X applications are crashing frequently with backtraces like the following: Process: Mail [39226] Path: /Applications/Mail.app/Contents/MacOS/Mail Identifier: com.apple.mail Version: 4.4 (1082) Build Info: Mail-10820000~1 Code Type: X86-64 (Native) Parent Process: launchd [338] Date/Time: 2011-01-12 21:59:48.383 -0500 OS Version: Mac OS X 10.6.6 (10J567) Report Version: 6 Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000002, 0x0000000000000000 Crashed Thread: 12 Dispatch queue: com.apple.root.default-priority [...] Thread 12 Crashed: Dispatch queue: com.apple.root.default-priority 0 com.apple.CoreFoundation 0x00007fff81653975 __THE_SYSTEM_HAS_NO_PORT_SETS_AVAILABLE__ + 5 1 com.apple.CoreFoundation 0x00007fff815a1f69 __CFRunLoopFindMode + 553 2 com.apple.CoreFoundation 0x00007fff815a1c5d __CFRunLoopCreate + 317 3 com.apple.CoreFoundation 0x00007fff815a1a78 _CFRunLoopGet0 + 744 4 com.apple.CoreFoundation 0x00007fff815dc90a CFRunLoopRunInMode + 58 5 com.apple.MessageFramework 0x00007fff81d01183 +[NSRunLoop(MessageExtensions) _flushQueuedEventsAddingSource:] + 120 6 com.apple.MessageFramework 0x00007fff81d010d2 +[NSRunLoop(MessageExtensions) flushQueuedEvents] + 36 7 com.apple.MessageFramework 0x00007fff81ce6515 -[_MFInvocationOperation main] + 275 8 com.apple.Foundation 0x00007fff83921de4 -[__NSOperationInternal start] + 681 9 com.apple.Foundation 0x00007fff83a00beb __doStart2 + 97 10 libSystem.B.dylib 0x00007fff801402c4 _dispatch_call_block_and_release + 15 11 libSystem.B.dylib 0x00007fff8011e831 _dispatch_worker_thread2 + 239 12 libSystem.B.dylib 0x00007fff8011e168 _pthread_wqthread + 353 13 libSystem.B.dylib 0x00007fff8011e005 start_wqthread + 13 [...] Any ideas about what might be causing this and/or how to remedy it?

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• Postfix tutorial inconsistency

  - by Desmond Hume

  I'm following this tutorial to setup a Postfix/Dovecot mail server with Postfix Admin as a web front end. As regards directory structure for virtual mail users, the author of the tutorial writes: Virtual mail users are those that do not exist as Unix system users. They thus don't use the standard Unix methods of authentication or mail delivery and don't have home directories. That is how we are managing things here: mail users are defined in the database created by Postfix Admin rather than existing as system users. Mail will be kept in subfolders per domain and account under /var/vmail - e.g. [email protected] will have a mail directory of /var/vmail/example.com/me. But when he gives instructions about configuring Postfix Admin, he suggests this to be contained by Postfix Admin's config.inc.php: // Mailboxes // If you want to store the mailboxes per domain set this to 'YES'. // Examples: // YES: /usr/local/virtual/domain.tld/[email protected] // NO: /usr/local/virtual/[email protected] $CONF['domain_path'] = 'NO'; Is there an inconsistency?

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• Proven and Scalable Comet Server

  - by demetriusnunes

  What is the most proven, scalable comet server solution out there that can handle up to 100.000 real-life connections per node using HTTP streaming (not long-poll)? It must be a free, preferably open-source project. We've already tried Meteor (Perl), with no success. Meteor was able to scale just up to 20.000 connections per node. We are looking right now at these options: APE (C++), Orbited (Python), Grizzly (Glassfish), Cometd (Jetty). Any big success stories with any of these?

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• IIS6 Front Page Extension: Set Reply-To in Webbot mailers

  - by hurikhan77

  We are running some old legacy IIS6 websites with frontpage extensions. The contact forms (using webbot frontpage extension) use the administrators email address as from address which is pretty cumbersome as our customers tend to click just reply in the requests they receive and we always get these mails and have to bother about them. How do you set a reply-to per webbot form? Or how do you set a from or reply-to globally per IIS6 vhost? In the HTML code it looks like this: <!--webbot bot="SaveResults" S-Email-Format="TEXT/PRE" S-Email-Address="[email protected]" ... --> But this is the recipient address. Additional question: Will it be sufficient to just change this code? Or do I need to apply settings elsewhere?

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