http://blog.alexzender.com Just another bunch of coding thoughts by Alexander Vushkan Sat, 03 Jan 2009 22:13:16 +0000 http://backend.userland.com/rss092 en I'm always keen on discovering and using tools that help to boost efficiency and  get more fun. That's why it's very important to learn and type as fast as you phisically can, that's why you need to learn vim emacs and use their hot-keys. Coding and typing routines shouldn't interfere with your ... http://blog.alexzender.com/2009/01/03/your-setup-and-efficiency/ Adobe keeps playing with alternative approaches in the lab. Just meet their Alchemy project Brief overview: Alchemy is primarily intended to be used with C/C++ libraries that have few operating system dependencies. Ideally suited for computation-intensive use cases, such as audio/video transcoding, data manipulation, XML parsing, cryptographic functions or physics simulation, performance ... http://blog.alexzender.com/2008/12/12/adobe-alchemy-running-c-code-in-the-browser/ Yeah, sometimes the code just flies out under our fingers, you don't think about typing, you don't think about switching between editors, IDE panels and browsers, you do all of this automatically, all you can think is your idea and its implementation. Done, for a couple of hours. In these ... http://blog.alexzender.com/2008/12/12/it-reduces-our-coding-fun/ Surprisingly I found an in-depth background available for undustrial cloude storage project - EMC's Atmos. Previously it was OceanStore project and EMC provided funding for the research few years ago. So, here you are, The OceanStore Project http://blog.alexzender.com/2008/11/27/technical-background-of-emcs-atmos-cloude-storage/ The Next Big Thing will come soon. It's not here yet but it's close. Let's consider symptoms: -- it was growing number of Web 1.0 users who read the web. Also there was small group of content authors who published stuff. Actually these numbers constantly keep growing even now. Less developed countries ... http://blog.alexzender.com/2008/11/25/pondering-over-the-next-big-thing/ In the following article there is an interesting comparison of Yahoo MapRaduce Stack vs Google One. Google numbers, numbers...   http://blog.alexzender.com/2008/11/24/sorting-1pb-with-mapraduce-at-google/ Recently we needed to resolve some performance issues, so I looked for the tool and started in eclipse plugin list. Luckily I found a one. You need to have binary dump of your heap in order to load it there and analyse. You can find how to do that here But this ... http://blog.alexzender.com/2008/11/24/java-profiling-in-eclipse/ Недавно Volkswagen обошел Google и Microsoft по капитализации, без каких-либо видимых фундаментальных причин :) Здесь можно почитать как зарабатывать деньги из воздуха и сколько стоила неосведомленность хедж-фондам. http://blog.alexzender.com/2008/11/03/%d0%bd%d0%b0%d1%81%d0%ba%d0%be%d0%bb%d1%8c%d0%ba%d0%be-%d0%b2%d0%b0%d0%b6%d0%b5%d0%bd-%d1%85%d0%be%d1%80%d0%be%d1%88%d0%b8%d0%b9-%d1%82%d0%b5%d1%85%d0%bd%d0%b8%d1%87%d0%b5%d1%81%d0%ba%d0%b8%d0%b9/ funny one - http://www.xs4all.nl/~weegen/eelis/analogliterals.xhtml http://blog.alexzender.com/2008/10/22/multi-dimensional-analog-literals-in-c/ I met the article written by Brad Fitzpatrick in 2004. It's interesting to track his thoughts on the memcached development. Now it's used everywhere in industry if the distributed memory-based caching needed. The key of its efficiency is an architecture represented by a set of isolated nodes that don't know aware ... http://blog.alexzender.com/2008/07/15/memcached-development-story/ Мы - представители одной из самых молодых профессий. Мы как строители и зодчие, которые каждый день кирпич за кирпичиком возводят новые сооружения. Некоторые строения иногда сносят - они уже свой век отжили-отсулжили. В отличии от сроительства в программировании "сносить" приходится довольно часто. Здесь "здания" могут стремительно еволюционировать и достраиваться очень ... http://blog.alexzender.com/2008/04/14/%d0%be%d0%b1-%d0%b0%d1%80%d1%85%d0%b8%d1%82%d0%b5%d0%ba%d1%82%d1%83%d1%80%d0%b5-%d0%b8-%d1%81%d1%82%d1%80%d0%be%d0%b8%d1%82%d0%b5%d0%bb%d1%8c%d1%81%d1%82%d0%b2%d0%b5/ Here is the article that describes how Flickr uses MySQL for its needs. http://blog.alexzender.com/2008/04/01/some-details-of-flickr-db-architecture/ For a long time I've been using Lingvo on Windows, despite the fact that it's not able to translate some words from modern english. On Linux it was Google Translate.  Though, it's boring sometimes to do the round trip:  Open new tab in FF -> go to google transate -> pick ... http://blog.alexzender.com/2008/03/13/english-russian-translation-using-google-talk/ Discovered a nice poster here http://blog.alexzender.com/2008/03/12/poster-of-http-headers-flow/ Встретил прикольную довольно большую таблицу соответсвтий здесь http://blog.alexzender.com/2008/03/07/%d0%b0%d0%bd%d0%b0%d0%bb%d0%be%d0%b3%d0%b8-windows-%d0%bf%d1%80%d0%be%d0%b3%d1%80%d0%b0%d0%bc%d0%bc-%d0%b2-ubuntu/ Многие слышали о технологиях которые используют Google, Microsoft, Yahoo у себя внутри. В основном, это благодаря количеству усилий, которые они тратят на популяризацию себя. Многие другие популярные ресурсы также имеют свои технологии, разработанные in-house, некоторые со временем выпускают их в мир(как например LiveJournal's Memcached) Одним из таких интересных ресурсов является Amazon.com. Недавно я ... http://blog.alexzender.com/2008/02/27/%d0%b0%d0%bc%d0%b0%d0%b7%d0%be%d0%bd-%d0%ba%d0%b0%d0%ba-%d0%bf%d0%bb%d0%b0%d1%82%d1%84%d0%be%d1%80%d0%bc%d0%b0-%d0%b8%d0%bd%d1%82%d0%b5%d1%80%d0%b2%d1%8c%d1%8e-%d1%81-amazons-cto-werner-vogels/ Majority of us knows that databases are read-optimized products and most of them are not optimized for writes. In this post I would like to describe what's going on under the hood of mysql that can help us to find origins of some well-known rules. So, let's start with MySQL MyIsam table: - ... http://blog.alexzender.com/2008/02/24/inside-mysql/ The article at codeproject describes framework that uses client-side Silverpoint CLR to implement web-based volunteer grid computing. Not a cool one, but the idea's interesting. Taking into account dramatic grouth of AJAX popularity and its adoption by a community, the paradigm shift towards grid-computing-in-the-browser is quite possible. http://blog.alexzender.com/2008/02/12/web-based-grid-computing/ It's a cool platform for distributed computing and research. Just check out the numbers: approximately 4,000 processors, three terabytes of memory, 1.5 petabytes of disks, peak performance of more than 27 trillion calculations per second (27 teraflop). -Source http://blog.alexzender.com/2008/02/12/yahoo-launches-4000-processor-supercomputer-availble-for-researchers/ On September 19, 2007 Heb Sutter did a presentation on a subject at MS. Snippet from description: High-level languages insulate the programmer from the machine. That’s a wonderful thing -- except when it obscures the answers to the fundamental questions of “What does the program do?” and “How much does it cost?” The ... http://blog.alexzender.com/2008/02/12/machine-architecture-things-your-programming-language-never-told-you-by-herb-sutter/ Almost everyone posted news on Ubuntu Gutsy. New enhanced desktop, flash support in firefox and etc. I decided to give it a try, and... spent a lot of time playing with cube, visual effects and so on. Yeah, it's fancy but eventually I'll switch it off and get back to work ... http://blog.alexzender.com/2008/02/12/desktop-cube-on-ubuntu-gutsy/ 24 и 25 сентября в Москве прошла конференция посвященная высоконагрузочным системам. Часть докладов уже доступна на RuTube. Не буду дублировать все доклады, приведу лишь те, что успел просмотреть и мне понравились: Anatolix рассказал о трудностях с которыми сталкивались в Яндексе при борьбе с высокими нагрузками. http://rutube.ru/tracks/197396.html?v=377843ff9b0f9eec261b9b8378e238d7 Большинство проблем в принципе классические в ... http://blog.alexzender.com/2008/02/12/%d0%bc%d0%b0%d1%82%d0%b5%d1%80%d0%b8%d0%b0%d0%bb%d1%8b-%d1%81-highloadru/ MySql comes with extremely useful feature full-text search. The minor thing that bored me was the minimum word length that mysql can index to. It was 4 letters by default on my machine. To change the value to desired one you need to: set ft_min_word_len variable up in my.ini ... http://blog.alexzender.com/2008/02/12/full-text-search-in-mysql-and-the-minimum-indexed-word-length/   To realize the value of ONE YEAR, ask a student who failed a grade To realize the value of ONE MONTH, ask a mother who gave birth to a premature baby. To realize the value of ONE WEEK, ask the editor of a weekly newspaper. To realize the value of ONE HOUR, ask the lovers who ... http://blog.alexzender.com/2008/02/12/to-realize/ http://channel9.msdn.com/rss.aspx?ShowID=13&format=mp3 Dot Net Rocks Hanselminutes Dr Neil's Notes Fly With Me (Joe D'On - pilot in the US) Fly With Me X (extra bits) Betty In The Sky With A Suitcase (flight attendant) Inside the Net (I like the interviews with web 2 startups - Leo Laporte and Amber Macarthur) Mark Kermode's film reviews (from Five Live and Simon ... http://blog.alexzender.com/2008/02/12/which-podcasts-to-listen-to/ Today I meet a strange one working with ec2 using command line tools. Each request could not be executes and I received each time Unknown host: 'https://ec2.amazonaws.com' Nslookup gave me: Non-authoritative answer: Name: ec2.amazonaws.com Address: 72.21.210.54 And finally, traceroute died with "Request timed out" message. After some digging I found a workaround export ... http://blog.alexzender.com/2008/02/12/amazon-ec2-gotchas/ For hierarchical clustering have a look at this resource Browsing the web I met interesting open source framework for search clustering engines. here is their table of algos (Original source)   .algorithms, .algorithms td { border:1px solid silver; } Algorithm Author Speed s* Hierarchical clustering Other features Example results 100 200 400 FuzzyAnts Steven Schockaert 2.17 8.70 16.93 yes london HAOG-STC Karol GoЕ'embniak 0.04 0.11 0.28 yes london Lingo** Stanislaw Osinski 0.34 0.52 0.84 no multilingual clustering london Rough k-means Ngo Chi Lang 1.38 6.76 27.73 no london STC Oren Zamir (impl: Dawid Weiss) 0.04 0.10 0.23 no london Lingo3G*** StanisЕ'aw OsiЕ"ski (Carrot Search) 0.03 0.06 0.13 yes multilingual clustering, synonyms, advanced ... http://blog.alexzender.com/2008/02/12/data-clustering-methods/ In most Java VM implementations, the garbage collector has the right to stop a thread in order to reclaim memory no longer used by that thread. Such garbage-collection pauses are the main reason threads running in a regular JVM cannot guarantee the exact timing of their execution...   Original source - http://www.artima.com/lejava/articles/javaone_2007_realtime_gc.html mp3 ... http://blog.alexzender.com/2008/02/12/real-time-garbage-collection-interview-from-javaone-2007/ Accidently met this resource surfing the web. http://www.google.com/patents A quite useful one, seems to me. E.g. you can have a look at such stuff as: System and hardware module for incremental real time garbage collection and memory management Packet processing system including a policy engine having a classification unit Type checking in java computing environments Java ... http://blog.alexzender.com/2008/02/12/google-patent-search/ It looks like I blog a lot on google :). But today I found an interesting thing. For instance: you can find buffer overflows :) , one more example or backdoors Simple, doesn't it? Yes, it simplifies a code inspection a lot… http://blog.alexzender.com/2008/02/12/google-code-search-a-wonderful-way-to-find-security-wholes/