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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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• 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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• Kill overscan for ATI drivers?

  - by joeforker

  I have a dual-boot Windows 7 64 bit/Linux 64 bit machine that uses ATI's Catalyst drivers. Sometimes I attach it to a 1080p LCD TV over HDMI. ATI is daft enough to provide a border to account for overscan. I'm using an LCD TV. No overscan, or it looks like crap because the pixel mapping is not 1:1. How do I disable this driver "feature" in Windows? in Linux?

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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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• 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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• 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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• 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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• Does Theora Decoder in libavcodec (FFMPEG V0.5) support YUV422 YUV444 modes?

  - by goldenmean

  Hello, I am working on theora decoder in ffmpeg V0.5. When i try to decode a 422 or 444 ogg/ogv bit stream using ffmpeg, the output yuv is junk. When i checked the ffmpeg source code, i saw that a pixel format is hardcoded to PIX_FMT_YUV420P. Does theora decoder in ffmpeg/libavcodec support decoding of YUV422/YUV444 mode bit streams? thanks, -AD.

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• How to config mysql-server for heavy load

  - by Rasmus

  Im in the process of setting up a new database server. I have been running a few mysql database servers before and it has been working okay. But i would like to hear the recommended setup for my server. For example, what should i set the max connection, query_cache_size, table_cache and so on. I have arround 4-600 per second: Open tables: 112 Queries per second avg: 430.386. The server i am setting it up on have the following configuration: Linux version 2.6.32-5-amd64 (Debian 2.6.32-41squeeze2) 2x Intel Xeon X3440 @ 2.53GHz 4GB Ram /, /boot, /tmp etc on Software RAID1, 2x 7200RPM SATA Data location on Software RAID0, 2x7200RPM SATA Im am going to place the mysql databases on the RAID0. Am im missing anything? Let me know! Thanks in advance, im looking forward to hearing from you :-) /Rasmus

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• Insert PDF image in MS Word

  - by serhio

  Hello. I have a .doc witch I will convert in PDF. In this .doc I has an image. When I convert the doc to PDF and then zoom it, the images became ugly pixel-ized. I found a tool that converted my bitmap .png image to vectorial .PDF image. Now how could I import the PDF image in MS Word (that finally I will convert to PDF once again)?

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• Recommended RAM and disc space for Oracle 11g on Windows

  - by Álvaro G. Vicario

  I need to provide the recommended amount of RAM and disc space (divided in two partitions) so the customer can create an appropriate virtual machine to run Oracle. All I could find in the documentation was a brief listing with minimum RAM and typical/advanced install types. The virtual machine will run latest Oracle Standard Edition One (11g release 2 so far) under Windows Server 2008 x64 and will host a reasonably low traffic web application. How much RAM and disc must I ask for in order to be safe? (Feel free to ask for further details if I've omitted something relevant.) Update: Rough estimations: Database size: 10 MB after installation Growth rate: +3MB per day on average Size of database 'active' data: (not sure of what this means, there's not actual archive so I guess all data is current) Amount of data written per second in peak hours: a few KB Number of client sessions: 3 or 4 at most Frequency and response size of most heavy requests: some reports make heavy table JOINS that need up to 20 seconds to complete but they won't return more than a few thousand rows with plain text. The app also handles BLOBs (typical size from 50KB to 200KB)

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• Most efficient Way to setup a game server

  - by alex bowers

  I'm running a PHP based game which has over 45 Million members predicted for end of this year (2011) Currently we are on 7.5 Million, this game is being ran on facebook and I am in desperate need to help get this game server as efficient and as powerful as possible. it is a dedicated server with Processor Manufacturer Intel Model i7 920 Frequency 4x 2x 2.66 GHz NIC GigaEthernet RAM 12 GB Hard disk 4 x 1 TB specs. It has apache installed, cPanel, phpMyAdmin, several apache mods and MySQL. The game also runs 47 mysql calls per second per user. Is there any alternatives to the above which could be faster, more efficient etc? I dont mind having to recode the game to fit to it, as long as it maximises our upper limit of members on the game. Thanks Also, is there a way to tell what our maximum limit to players, database calls etc is? Thank you again, hope you guys can help :)

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• Caching DNS server (bind9.2) CPU usage is so so so high.

  - by Gk

  Hi, I have a caching-only dns server which get ~3k queries per second. Here is specs: Xeon dual-core 2,8GHz 4GB of RAM Centos 5x (kernel 2.6.18-164.15.1.el5PAE) bind 9.4.2 rndc status: recursive clients: 666/4900/5000 About 300 new queries (not in cache) per second. Bind always uses 100% on one core on single-thread config. After I recompiled it to multi-thread, it uses nearly 200% on two core :( No iowait, only sys and user. I searched around but didn't see any info about how bind use CPU. Why does it become bottleneck? One more thing, here is RAM usage: cat /proc/meminfo MemTotal: 4147876 kB MemFree: 1863972 kB Buffers: 143632 kB Cached: 372792 kB SwapCached: 0 kB Active: 1916804 kB Inactive: 276056 kB I've set max-cache-size to 0 to make sure bind can use as much RAM as it want, but it always stop at ~2GB. Since every second we got not cached queries so theoretically RAM must be exhausted but it wasn't. Do you have any idea? TIA, -Gk

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• Tiff not displaying correctly on Mac

  - by user348935

  Hi, I have a collection of .tif files but when I open them on my Mac 10.5 they show up as solid black and I don't know why. thanks Upon further inspection at really high brightness there are some out of focus objects viewable. It looks as if I am getting the first couple bits of each pixel but not the entire range of values.

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• Windows Server 2008R2 IIS7.5, Requests getting 401 status

  - by TLBH

  We have a web site running in windows server 2008r2 iis7.5 and we are seeing several errors reported from our global error handler saying that "Request Timed Out". I matched up one to the IIS log file and see the request took 135116 (presumably milliseconds) had an sc-status of 401 an sc-sub0status of 0 and an sc-win32-status of 64. 2 requests failed in these way but lots of surrounding requests (1979 successful requests vs 2 fails) for the same user went through perfectly fine- with the same cs-username which makes a 401 seem a little odd. The target of the requests is an ASP.Net web service's web method called by the .net client library- it's called a lot of times per user (3 times per second) to keep a page updated. We're getting some users reportng seeing a freezing effect and I think this may be the cause, any ideas? Peter

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