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  • Podcasting vs Stack Overflow vs Geekswithblogs

    - by MarkPearl
    For a few years now I have been looking for effective ways to be involved in the “community”. While there are a few community programming events in my area (Johannesberg), there isn’t too much face to face stuff – which has caused me to turn to the internet. My internet attempts have been varied – at first I took the passive approach of listening to tech podcasts. This was great for a while, but soon the content became semi-repetitive and a little boring. It seemed that the podcasts I was listening to all went round the same themes and speakers and while I am still a keen listener to several tech podcasts – it didn’t quench my thirst. So I began to be a bit more active – starting with stack overflow – where I would scan the site for questions that were in the realm of my ability to answer. It worked for a while but soon it began to be discouraging – there seems to be so many people that know so much more than me and are quicker at typing that I felt fairly ineffective. So while I still use Stack Overflow when I am in a pickle and need some help – it feels more like me taking from the community than giving anything. Which brought me to Geeks with blogs. Till I found GWB I hadn’t felt like I was an active part of a community. I had blogged before on Blogspot and Wordpress but hadn’t felt associated to the community. Now when I get a comment from someone on one of my GWB posts either thanking me or adding a bit more or correcting me, it makes me feel like I am contributing to a community. So well done GWB. Thanks for making a spot that makes me feel at home!

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  • Oracle Linux / Symantec Partnership

    - by Ted Davis
    Fred Astaire and Ginger Rogers sang the now famous lyrics:  “You like to-may-toes and I like to-mah-toes”. In the tech world, is it Semantic or is it Symantec? Ah, well, we know it’s the latter. Actually, who doesn’t know or hasn’t heard of Symantec in the tech world? Symantec is thoroughly engrained in Enterprise customer infrastructure from their Storage Foundation Suite to their Anti-Virus products. It would be hard to find anyone who doesn’t use their software. Likewise, Oracle Linux is thoroughly engrained in Enterprise infrastructure – so our paths cross quite a bit. This is why the Oracle Linux  engineering team works with Symantec to make sure their applications and agents are supported on Oracle Linux. We also want to make sure the Oracle Linux / Symantec customer experience is trouble free so customer work continues at the same blistering pace. Here are a few Symantec applications that are supported on Oracle Linux: Storage Foundation Netbackup Enterprise Server Symantec Antivirus For Linux Veritas Cluster Server Backup Exec Agent for Linux So, while Fred and Ginger may disagree on how to spell tomato, for our software customers, the Oracle / Symantec partnership works together so our joint customers experience and hear the sweet song of success.

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  • Since a few days, Dropbox stopped syncing

    - by Fabio
    Theres a new problem with nautilus-dropbox and is the worst for a service like Dropbox: stopped syncing and their tech support don't believe their users. The problem is: start dropbox it downloads index creates folders start to download files stop downloading files or the speed is like 0.3k/seg even deleting everything doesn't work, even syncing a single folder with a few files, not even configuring a different limit speed or let all your bandwith, nothing works for me and i have found many users with the same problem. it's strange, i have two computers with ubuntu 14.04 and one with windows 7, and in one of the linux machines it works fine, but not in the other one. Both of them are x64. The answers from the tech support starts with "delete everything and reinstall" to "you may be blocking port 443", yeah, sure (and if i do that half of internet dissapears, idiot), but nothing works. Someone has some idea? i cant find any log file (at least a text log file like in /var/log) to understand what is dropbox doing and what is not working. PS: sorry for my "english", is not my language Examples: dropbox slow on ubuntu 14.04 Dropbox does not sync on ubuntu 14.04 Dropbox Status (in spanish but is the same thing) fabio@canopus:~$ dropbox status Sincronizando (Quedan 330 archivos., Faltan 9 días.) Descargando 330 archivos... (0,3 KB/s, Faltan 9 días.) 9 days for 330 files / 100Mb

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  • Get Smarter Just By Listening

    - by mark.wilcox
    Occasionally my friends ask me what do I listen/read to keep informed. So I thought I would like to post an update. First - there is an entirely new network being launched by Jason Calacanis called "ThisWeekIn". They have weekly shows on variety of topics including Startups, Android, Twitter, Cloud Computing, Venture Capital and now the iPad. If you want to keep ahead (and really get motivated) - I totally recommend listening to at least This Week in Startups. I also find Cloud Computing helpful. I also like listening to the Android show so that I can see how it's progressing. Because while I love my iPhone/iPad - it's  important to keep the competition in the game up to improve everything. I'm also not opposed to switching to Android if something becomes as nice experience - but so far - my take on Android devices are  - 10 years ago, I would have jumped all over them because of their hackability. But now, I'm in a phase, where I just want these devices to work and most of my creation is in non-programming areas - I find the i* experience better. Second - In terms of general entertaining tech news - I'm a big fan of This Week in Tech. Finally - For a non-geek but very informative show - The Kevin Pollack Show on ThisWeekIn network gets my highest rating. It's basically two-hours of in-depth interview with a wide variety of well-known comedian and movie stars. -- Posted via email from Virtual Identity Dialogue

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  • What's upcoming in the GlassFish Webinar Series

    - by pieter.humphrey
    2011 is kicking off with the return of the GF Webinar series as you've never seen it before.  It's going to be packed with information about Java EE6 and how simplicity, testability and convention-over-configuration is winning the hearts and minds of enterprise Java developers.  Don't miss these industry leading speakers and topics reviewing the cutting edge of Java EE6 implementations, tools, and much more.   Note:  future dates are subject to change. Jan 20th: GlassFish & Netbeans Jan 27th: Building a Simple Web Application with Java EE Feb 15th: Java EE Developer Tools 'shootout' with GlassFish Feb 24th: What's New in GlassFish 3.1 Clustering & HA Admin Console Coherence Web Integration Security Microkernel Architecture March 15th: GlassFish 3.1 - clustering deep dive March 29th: GlassFish 3.1 - Admin Console & Productivity Features April 5th: GlassFish 3.1 - Coherence Web Integration deep dive Possible "Tech cast live" event: April (date TBC): Special Guest Adam Bien April 19th: GlassFish 3.1 - Security deep dive with Byron Nevins & TBD May 3rd: GlassFish 3.1 - Microkernel Architecture deep dive Possible "Tech cast live" event: May 17th: "Upgrading to 3.1 from existing GlassFish installations" May 31st: Embedded GlassFish del.icio.us Tags: glassfish,development,java,java ee,java ee6,OTN,NetBeans,JDeveloper,enterprise Pack for Eclipse Technorati Tags: glassfish,development,java,java ee,java ee6,OTN,NetBeans,JDeveloper,enterprise Pack for Eclipse

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  • How to Manage Technical Employees

    - by Ajarn Mark Caldwell
    In my current position as Software Engineering Manager I have been through a lot of ups and downs with staffing, ranging from laying-off everyone who was on my team as we went through the great economic downturn in 2007-2008, to numerous rounds of interviewing and hiring contractors, full-time employees, and converting some contractors to employee status.  I have not yet blogged much about my experiences, but I plan to do that more in the next few months.  But before I do that, let me point you to a great article that somebody else wrote on The Unspoken Truth About Managing Geeks that really hits the target.  If you are a non-technical person who manages technical employees, you definitely have to read that article.  And if you are a technical person who has been promoted into management, this article can really help you do your job and communicate up the line of command about your team.  When you move into management with all the new and different demands put on you, it is easy to forget how things work in the tech subculture, and to lose touch with your team.  This article will help you remember what’s going on behind the scenes and perhaps explain why people who used to get along great no longer are, or why things seem to have changed since your promotion. I have to give credit to Andy Leonard (blog | twitter) for helping me find that article.  I have been reading his series of ramble-rants on managing tech teams, and the above article is linked in the first rant in the series, entitled Goodwill, Negative and Positive.  I have read a handful of his entries in this series and so far I pretty much agree with everything he has said, so of course I would encourage you to read through that series, too.

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  • How to hire support people?

    - by Martin
    I manage a tech support team at a mid-sized software company. We are the last line of support, so issues that we can't fix need to be escalated to the development team. When I joined the company, our team wasn't capable of much beyond using a specific set of troubleshooting steps to solve known issues and escalating anything else to the developers. It's always been a goal of mine for our team to shoulder as much of the support burden as possible without ever bothering a developer. Over the past few years, I, along with several new hires I've made, have made pretty good progress in that direction. We've coded our own troubleshooting tools which now ship with several of our products. When users have never-before-seen issues, we analyze stack traces and troubleshoot down to the code level, and if we need to submit a bug, half the time we've already identified in the code where in the code the bug is and offered a patch to fix it. Here's the problem I've always had: finding support people capable of the work I've described above is really difficult. I've hired 3 people in the past 3 years, and I've probably looked at several thousand resumes and conducted several hundred phone screens to do so. I know it's pretty well accepted that hiring good people is tough in the tech industry, but it seems that support is especially difficult -- there are clearly thousands of people walking around calling themselves support analysts, but 99%+ of them seemingly aren't capable of anything beyond reading a script. I'm curious if anyone has experience recruiting the sort of folks I'm talking about, and if you have any suggestions to share. We've tried all sorts of things -- different job titles/descriptions, using headhunters, etc. And while we've managed to hire a few good folks, it's basically taken us a year to find an appropriate candidate for each opening we've had, and I can't help but wonder if there's something we could be doing differently.

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  • Just started a job with Scrum. Something seems to be missing. I am new to Scrum

    - by punkouter
    The code is a complete mess of a combination of classic ASP/ASP.NET. The scrum consist of us patching up the big mess or making additions to it. We are all too busy doing that to start a rewrite so I am wondering.. Where is the part in Scrum where the developers can have the power to say that enough is enough and demand that they are given time to start the big rewrite ? We seem in an endless loop of just patching old code with 'Stories'. So things are being run by the non-technical people who seem to have no desire to push for a rewrite because they don't understand how bad the code base has gotten.. So who is in charge of making this big rewrite change happen ? The devs? The scrum master? The current strategy is just find time and do it ourselves without the higher ups involved.. since they are mostly to blame for the current mess we are in.. <-insert rant about non-tech people telling tech people what to do here-

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  • The Science Behind Technological Moral Panics

    - by Jason Fitzpatrick
    Why do some new technologies cause ripples and reactionary backlash in society but others slip into our daily lives almost entirely uncontested? It turns out there’s a rather specific combination of things the new technology must do to upset the public. At Wired they highlight the work of Genevieve Bell and her studies of how society reacts to new technology: Genevieve Bell believes she’s cracked this puzzle. Bell, director of interaction and experience research at Intel, has long studied how everyday people incorporate new tech into their lives. In a 2011 interview with The Wall Street Journal‘s Tech Europe blog, she outlined an interesting argument: To provoke moral panic, a technology must satisfy three rules. First, it has to change our relationship to time. Then it has to change our relationship to space. And, crucially, it has to change our relationship to one another. Individually, each of these transformations can be unsettling, but if you hit all three? Panic! Why We Freak Out About Some Technologies but Not Others [Wired] How To Play DVDs on Windows 8 6 Start Menu Replacements for Windows 8 What Is the Purpose of the “Do Not Cover This Hole” Hole on Hard Drives?

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  • How-To Geek is Hiring a Geeky Writer – Here Are the Details

    - by The Geek
    Think you have the perfect combination of geek knowledge and writing skills? We’re looking for an experienced writer to join our team, and here are all the details. We need a new writer to cover topics surrounding Windows 7 or 8, home networking, home routers, security, media, troubleshooting, mobile devices, and many similar topics. We are not looking for writers that focus solely on Linux or tech news writers. Please apply if you have the following qualities: You must be a geek at heart. You must be able to put in plenty of time, work, and dedication. If you’re too busy already, don’t apply. You must be able to write articles that are easy to understand. You must be creative. You must generate ideas for articles on your own, and take suggestions like a pro. You must be at least 18 years old. You must have solid English writing skills. You must be able to write tips, how-to articles, explainers, guides, instructional articles, etc. Again, we are not looking for tech news writers. Here’s a couple of our previous articles so you can get an idea of what we’re looking for in terms of quality and content. Please make sure to look through these before you decide to apply. How-to Article: Make Your Own Windows 8 Start Button with Zero Memory Usage Explainer: HTG Explains: When Do You Need to Update Your Drivers? Explainer: HTG Explains: Why Do Hard Drives Show the Wrong Capacity in Windows? How-To Article: How to Factory Reset Your Android Phone or Tablet When It Won’t Boot How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot Our Geek Trivia App for Windows 8 is Now Available Everywhere

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  • Use of list-unsubscribe to improve inbox delivery

    - by Jeffrey Simon
    To overcome email being classified as spam by Gmail, Google recommends a number of steps, which we have implemented (namely SPF, DKIM, and Precedence: bulk). One additional measure they recommend at https://support.google.com/mail/bin/answer.py?hl=en&answer=81126#authentication reads as follows: Because Gmail can help users automatically unsubscribe from your email, we strongly recommend the following: Provide a 'List-Unsubscribe' header which points to an email address where the user can unsubscribe easily from future mailings (Note: This is not a substitute method for unsubscribing). Documentation for List-Unsubscribe is found at http://www.list-unsubscribe.com/. From this documentation I expect a button to be provided by a supported mail client. I have tested the 'List-Unsubscribe' header and it does not appear to provide the button. I have tested in both Gmail and OS X Mail. I tested with an http address and with both an email address and an http address. The format of the header is as follows: List-Unsubscribe: <mailto:[email protected]>, <http://domain.com/member/unsubscribe/[email protected]?id=12345N> No button appears in any test. My questions: How widely is List-Unsubscribe supported? Should a button be appearing somewhere, or does something else have to be present? I have seen a comment that even if the button is not present, services like Gmail, Yahoo, Hotmail/Windows Live would give higher regard to email having the header. Thus it might be worthwhile for this aspect alone. Please note that our standard email footer already contacts instructions and a link to allow unsubscribing from our email. Finally, is it worth while to implement this header? (That is, any downsides?)

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  • Twitter Tuesday - Top 10 @ArchBeat Tweets - June 3-9, 2014

    - by OTN ArchBeat
    The Top 10 tweets from @OTNArchBeat for the last seven days. RT @DBAKevlar: #EM12c rel4 is out! Woohoo!! Jun 3, 2014 at 10:36 AM Top 10 Arch Community Articles for May 2014 >> props to @markrittman @kevin_mcginley @porushh et al Jun 4, 2014 at 12:52 PM Architecture of Analytics: @markrittman @kevin_mcginley >> Free OTN Virtual Tech Summit - July 9 Jun 4, 2014 at 09:13 AM My Top 10 Tweets - May 27 - June 2 #ADF #Essbase #FusionApps #Goldengate #Kscope14 #WebLogic. Jun 3, 2014 at 10:27 AM Starting and Stopping a #JavaEE Environment when using Oracle #WebLogic | Rene van Wijk #oracleace Jun 5, 2014 at 11:00 AM Video: #KScope14 Preview: @DebraLilley never stops moving, never stops learning. Jun 3, 2014 at 11:19 AM The OTNArchBeat Daily is out! Stories via @oraclebase Jun 9, 2014 at 01:47 PM Where did my MDB concurrency go? | Eric Gross #weblogic Jun 9, 2014 at 08:48 AM Exalogic Tech tips and code samples from A-Team architect Andrew Hopkinson Jun 6, 2014 at 11:47 AM The OTNArchBeat Daily is out! Stories via @KentGraziano @DBAKevlar @dbasolved Jun 3, 2014 at 01:48 PM adf, essbase,

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  • So my employer wants me to do less programming and focus on IT support

    - by Rich
    I was hired into a non tech company's IT department as a programmer a few years back, and after several rounds of lay offs, we're down to a skeleton crew. I've saved the company hundreds of thousands of dollars with my projects and management has been happy with them (although most of the stakeholders have since left the company). Management now wants me to limit the programming that I do and spend most of my time on IT support: putting out fires, dealing with vendors, outsourced contractors, supporting company systems, managing projects, etc. I am a little burnt out on programming since I've been pushed pretty hard for the past several years. However, I'm not sure if this is a good career move in the long run. I'm a decent programmer (and also good with databases) but not obsessed with it to the point of coding outside of work. I'm approaching my mid 30s and there's potential ageism to deal with down the line. While I'm fortunate to have survived the lay offs, it sorta feels like my job is being "dumbed down". I have both good technical skills and people skills...but it doesn't take a genius to do what I'm doing now. And my success is being increasingly linked to others' performance rather than my own... Just looking for some advice. Is it time to move on? That's not really an easy thing to do since I'd likely have to move to another area to find another comparable tech job. Should I go after another pure technical role? Or should I stay and try to make this work? People say do what you "enjoy" but it doesn't really matter to me as long as I'm getting paid. Also the ageism thing is on the horizon and could be an issue eventually. I'm making a decent (but not great) salary. Should I chase money and maximize my income while I still have a chance? Or be happy with a moderate salary and 40 hour work week?

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  • OBIEE Capacity Planning

    - by THE
    I can not even recall how many times I was asked by a customer what size the machine should be bought to run our Software. Unfortunately Tech Support is not even the right address to answer that question, as a purchase decision is closely tied to the answer. Hence, Tech Support has been limited to the answer: "The biggest machine you can afford" . Many Customers were unhappy with that and have tried to get us to be more precise and that causes a lot of explanation and lengthy discussion. In the end no one is wiser or happier.  Therefore I am happy to report that at least for OBIEE the decision has just been made a whole lot easier. Have a look at the note Oracle BI EE 11g Architectural Deployment: Capacity Planning (Doc ID 1323646.1) The document attached to that note gives you a good overview for teh sizing of the machines that Oracle recommends to run OBIEE (be it a small installation or a bigger distributed installation) If you have any more questions about this topic and what machines we recommend, then get in contact with  Oracle Consulting or speak to your sales representative.

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  • Problem with understanding how to start

    - by Coolface
    Okay, this might be a little off-topic but i try anyway. Sorry to bother. So i'm working as sysadmin for at least 5 years now and i quite enjoy IT field in general. Somehow i was never interested in programming much but always want to learn something at least easy and for personal usage. As sysadmin i need scripting skills so learn shell scripting without much problems, i also try to learn pascal, delphi, basic over time and must recent was python. Well, my problem is when i try to learn programming i just can't apply what i learn from the books to the real word. What i mean is i understand there are data structures, algorithms, variables, lib's, if-then logic, etc. but i just can't understand how to apply this things when i want to do real things. Like i want to get a something simple as parse web page, i draw a quick algorithm like get a web page, find a word on it and write a to file, on the paper everything look simple but when i get to the coding i just stuck pretty much from the start. I try read code of the real programs that just totally confusing especially big parts with many classes so i'm just quickly lost a trail what this code do. I think i just lack some fundamentals to see a big picture but don't really know what this might be? Or maybe i just don't have a passion to programming at all... My best bet was a shell scripting so i have really no problems to write complex scripts but this just not enough. Recently i was read around 5 or 6 python books because everyone say it's so easy even kid can code something but still no much luck, python is good and easy but i can't make something harder then a prodecurial style code like in bash for easy things but when i want harder things i'm still stuck. In college i was also not a math and tech guy and like to study non-tech stuff mostly like economy, psychology maybe that my problem? Anyway any advice would be greatly appriciated.

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  • Java POI 3.6 XWPF usage guidelines (reading content of docx file)

    - by Mr CooL
    I assume the following objects should be used to read contents of DOCX file: XWPFDocument XWPFWordExtractor However, somewhere the compiler warns me from not including the correct libraries needed in classpath. I think I'm kinda lost for not knowing which jar file is the right one to include for this since there are so many jar files (POI libraries). My project so far involve in reading doc and docx files as part of the project. I've managed to read the contents of doc file. However, for docx file, I'm still having problem with that. Can anyone show the guidelines in terms of the codes and libraries needed (jar files) to read the content of docx file? I'm trying to limit the libraries need to be added on into project since I need to read doc and docx only. The following works for doc: fs = new POIFSFileSystem(new FileInputStream(fileName)); HWPFDocument doc = new HWPFDocument(fs); WordExtractor we = new WordExtractor(doc); String[] p = we.getParagraphText();

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  • Python: split files using mutliple split delimiters

    - by donalmg
    Hi, I have multiple CSV files which I need to parse in a loop to gather information. The problem is that while they are the same format, some are delimited by '\t' and others by ','. After this, I want to remove the double-quote from around the string. Can python split via multiple possible delimiters? At the minute, I can split the line with one by using: f = open(filename, "r") fields = f.readlines() for fs in fields: sf = fs.split('\t') tf = [fi.strip ('"') for fi in sf] Any suggestions are welcome.

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  • Zend_Json::decode returning null

    - by davykiash
    Am trying to validate my form using an AJAX call $("#button").click(function() { $.ajax({ type: "POST", url: "<?php echo $this->baseUrl() ?>/expensetypes/async", data: 'fs=' + JSON.stringify($('#myform').serialize(true)), contentType: "application/json; charset=utf-8", dataType: "json" }); }); On my controller my code is as follows //Map the form from the client-side call $myFormData = Zend_Json::decode($this->getRequest()->getParam("fs") ,Zend_Json::TYPE_ARRAY); $form = new Form_Expensetypes(); $form->isValid($myFormData); My problem is that I cannot validate since Zend_Form::isValid expects an array Am not quite sure wether the problem is at my serialisation at the client end or Zend_Json::decode function does not function with this kind of JSON parsing.

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  • Embedded file system and sqlite

    - by Jeff Lamb
    I'm working on an embedded project that has no file system, and our kludge of a database has ballooned in functionality. It's now so inefficient, we can't stand it any longer. I'm trying to figure out if there's built-in support for a flat file system in SQLite. I've dug around http://sqlite.org for a while now, but haven't found anything specifically covering it. Has anyone found a supported implementation written in C? It seems like such a straightforward request, but I can't find anything written about it. We have plenty of memory available. In a perfect world, I'd like to just set aside a large portion of it, pass the FS a pointer, then let the FS/SQLite library just use what it wants.

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  • Error in using Hadoop MapReduce in Eclipse

    - by Shweta
    When I executed a MapReduce program in Eclipse using Hadoop, I got the below error. It has to be some change in path, but I'm not able to figure it out. Any idea? 16:35:39 INFO mapred.JobClient: Task Id : attempt_201001151609_0001_m_000006_0, Status : FAILED java.io.FileNotFoundException: File C:/tmp/hadoop-Shwe/mapred/local/taskTracker/jobcache/job_201001151609_0001/attempt_201001151609_0001_m_000006_0/work/tmp does not exist. at org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:361) at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:245) at org.apache.hadoop.mapred.TaskRunner.setupWorkDir(TaskRunner.java:519) at org.apache.hadoop.mapred.Child.main(Child.java:155)

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  • faking a filesystem / virtual filesystem

    - by attwad
    I have a web service to which users upload python scripts that are run on a server. Those scripts process files that are on the server and I want them to be able to see only a certain hierarchy of the server's filesystem (best: a temporary folder on which I copy the files I want processed and the scripts). The server will ultimately be a linux based one but if a solution is also possible on Windows it would be nice to know how. What I though of is creating a user with restricted access to folders of the FS - ultimately only the folder containing the scripts and files - and launch the python interpreter using this user. Can someone give me a better alternative? as relying only on this makes me feel insecure, I would like a real sandboxing or virtual FS feature where I could run safely untrusted code.

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  • Howto add a changed file to an older (not last) commit in Git

    - by David Klein
    Hey, I changed several things over the last hour and committed them step by step. But I just realized I've forgot to add a changed file some commits ago. The Log looks like this: GIT TidyUpRequests u:1 d:0> git log commit fc6734b6351f6c36a587dba6dbd9d5efa30c09ce Author: David Klein <> Date: Tue Apr 27 09:43:55 2010 +0200 The Main program now tests both Webservices at once commit 8a2c6014c2b035e37aebd310a6393a1ecb39f463 Author: David Klein <> Date: Tue Apr 27 09:43:27 2010 +0200 ISBNDBQueryHandler now uses the XPath functions from XPath.fs too commit 06a504e277fd98d97eed4dad22dfa5933d81451f Author: David Klein <> Date: Tue Apr 27 09:30:34 2010 +0200 AmazonQueryHandler now uses the XPath Helper functions defined in XPath.fs commit a0865e28be35a3011d0b6091819ec32922dd2dd8 <--- changed file should go here Author: David Klein <> Date: Tue Apr 27 09:29:53 2010 +0200 Factored out some common XPath Operations Any ideas? :)

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  • C# WPF application is using too much memory while GC.GetTotalMemory() is low

    - by Dmitry
    I wrote little WPF application with 2 threads - main thread is GUI thread and another thread is worker. App has one WPF form with some controls. There is a button, allowing to select directory. After selecting directory, application scans for .jpg files in that directory and checks if their thumbnails are in hashtable. if they are, it does nothing. else it's adding their full filenames to queue for worker. Worker is taking filenames from this queue, loading JPEG images (using WPF's JpegBitmapDecoder and BitmapFrame), making thumbnails of them (using WPF's TransformedBitmap) and adding them to hashtable. Everything works fine, except memory consumption by this application when making thumbnails for big images (like 5000x5000 pixels). I've added textboxes on my form to show memory consumption (GC.GetTotalMemory() and Process.GetCurrentProcess().PrivateMemorySize64) and was very surprised, cuz GC.GetTotalMemory() stays close to 1-2 Mbytes, while private memory size constantly grows, especially when loading new image (~ +100Mb per image). Even after loading all images, making thumbnails of them and freeing original images, private memory size stays at ~700-800Mbytes. My VirtualBox is limited to 512Mb of physical memory and Windows in VirtualBox starts to swap alot to handle this huge memory consumption. I guess I'm doing something wrong, but I don't know how to investigate this problem, cuz according to GC, allocated memory size is very low. Attaching code of thumbnail loader class: class ThumbnailLoader { Hashtable thumbnails; Queue<string> taskqueue; EventWaitHandle wh; Thread[] workers; bool stop; object locker; int width, height, processed, added; public ThumbnailLoader() { int workercount,i; wh = new AutoResetEvent(false); thumbnails = new Hashtable(); taskqueue = new Queue<string>(); stop = false; locker = new object(); width = height = 64; processed = added = 0; workercount = Environment.ProcessorCount; workers=new Thread[workercount]; for (i = 0; i < workercount; i++) { workers[i] = new Thread(Worker); workers[i].IsBackground = true; workers[i].Priority = ThreadPriority.Highest; workers[i].Start(); } } public void SetThumbnailSize(int twidth, int theight) { width = twidth; height = theight; if (thumbnails.Count!=0) AddTask("#resethash"); } public void GetProgress(out int Added, out int Processed) { Added = added; Processed = processed; } private void AddTask(string filename) { lock(locker) { taskqueue.Enqueue(filename); wh.Set(); added++; } } private string NextTask() { lock(locker) { if (taskqueue.Count == 0) return null; else { processed++; return taskqueue.Dequeue(); } } } public static string FileNameToHash(string s) { return FormsAuthentication.HashPasswordForStoringInConfigFile(s, "MD5"); } public bool GetThumbnail(string filename,out BitmapFrame thumbnail) { string hash; hash = FileNameToHash(filename); if (thumbnails.ContainsKey(hash)) { thumbnail=(BitmapFrame)thumbnails[hash]; return true; } AddTask(filename); thumbnail = null; return false; } private BitmapFrame LoadThumbnail(string filename) { FileStream fs; JpegBitmapDecoder bd; BitmapFrame oldbf, bf; TransformedBitmap tb; double scale, dx, dy; fs = new FileStream(filename, FileMode.Open); bd = new JpegBitmapDecoder(fs, BitmapCreateOptions.None, BitmapCacheOption.OnLoad); oldbf = bd.Frames[0]; dx = (double)oldbf.Width / width; dy = (double)oldbf.Height / height; if (dx > dy) scale = 1 / dx; else scale = 1 / dy; tb = new TransformedBitmap(oldbf, new ScaleTransform(scale, scale)); bf = BitmapFrame.Create(tb); fs.Close(); oldbf = null; bd = null; GC.Collect(); return bf; } public void Dispose() { lock(locker) { stop = true; } AddTask(null); foreach (Thread worker in workers) { worker.Join(); } wh.Close(); } private void Worker() { string curtask,hash; while (!stop) { curtask = NextTask(); if (curtask == null) wh.WaitOne(); else { if (curtask == "#resethash") thumbnails.Clear(); else { hash = FileNameToHash(curtask); try { thumbnails[hash] = LoadThumbnail(curtask); } catch { thumbnails[hash] = null; } } } } } }

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  • F# on Mac: Syntax Error on Inner Function

    - by JBristow
    The following code: exception NoElements of string let nth(k, list) = let rec loop count list = match list with | head :: _ when count = k -> head | _ :: tail when count <> k -> loop (count+1) tail | [] -> raise (NoElements("No Elements")) loop 0 list ;; printfn "%A" (nth(2, [1, 1, 2, 3, 5, 8])) Produces the following errors when compiling on a mac, but not in Visual Studio 2010: nth.fs(10,0): error FS0191: syntax error. nth.fs(4,4): error FS0191: no matching 'in' found for this 'let'.

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  • jquery, Regexp, make dynamic url

    - by Alexander Corotchi
    Hi , I need a regexp help, because for me it will take a lot of time , for you some minutes:) I have youtube a URL : http://www.youtube.com/watch?v=9_Hd8hXhg7o&feature=youtube_gdata I can't add this in embed object , for embed I have to change in this URL : http://www.youtube.com/v/9_Hd8hXhg7o&hl=en_US&fs=1& It means, that I want to add the youtube cod in some variable, something like this var url = after regexp "9_Hd8hXhg7o"; "http://www.youtube.com/v/" + url +"&hl=en_US&fs=1&"; thanks !

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