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• High PageIOLatch_SH Waits with High Drive Idle times

  - by Marty Trenouth

  We are experiencing high volume of PageIOLatch_SH waits on our database (row counts in the Billions). However it seems that our drive Idle time Percentage hovers around 50-60 percent. CPU usage is nill. The Database Tuning Advisor gives no suggestions for optimization. The query plan (actual) from the single stored procedure used on the database puts the majority of the expense on index seek (yeah I know these should be optimial) operations. Anyone have suggestions of how to increase throughput?

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• Adding scope variable to an constructor

  - by Lupus

  I'm trying to create a class like architecture on javascript but stuck on a point. Here is the code: var make = function(args) { var priv = args.priv, cons = args.cons, pub = args.pub; return function(consParams) { var priv = priv, cons = args.cons; cons.prototype.constructor = cons; cons.prototype = $.extend({}, pub); if (!$.isFunction(cons)) { throw new Hata(100001); } return new cons(consParams); } }; I'm trying to add the priv variable on the returned function objects's scope and object scope of the cons.prototype but I could not make it; Here is the usage of the make object: var myClass = make({ cons: function() { alert(this.acik); }, pub: { acik: 'acik' }, priv: { gizli: 'gizli' } }) myObj = myClass(); PS: Please forgive my english...

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• Lua API for TokyoTyrant

  - by jideel

  Hi SO folks, I didn't managed to find an Lua client/api for TokyoTyrant. Such Api exists for TokyoCabinet, but not for TT. And Perl and Ruby API exists for TT. TT provides a native binary protocol, a memcached-compatible protocol, and an HTTP-oriented protocol. So my questions are : 1/ Do you think using the memcached (using luamemcached) or the HTTP protocol (using luaSocket) is "enough" for most / simple usage, and so a native Lua api is not necessary ? (the app is a simple uuid storage/distributor) ? 2/ Does it make sense to not use TokyoTyrant, but only TokyoCabinet, and use Lua at the application level to provide network and concurrent access to TC, using, say, Copas (Copas is , from their website, "a dispatcher based on coroutines that can be used by TCP/IP servers." ? Thanks.

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• Capturing SOAP requests to an ASP.NET ASMX web service

  - by pcampbell

  Consider the requirement to log incoming SOAP requests to an ASP.NET ASMX web service. The task is to capture the raw XML being sent to the web service. The incoming message needs to be logged for debug inspection. The application already has its own logging library in use, so the ideal usage would be something like this: //string or XML, it doesn't matter. string incomingSoapRequest = GetSoapRequest(); Logger.LogMessage(incomingSoapRequest); Are there any easy solutions to capture the raw XML of the incoming SOAP requests? Which events would you handle to get access to this object and the relevant properties?

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• Resources for Programmatic Rendering of Topology Maps

  - by bn

  Servus, Do you know of any frameworks, APIS, languages, or other resources that are well suited for drawing topology maps that allow a user to interact with objects on the map? I am not constrained by language choice and the program can be web-based, or stand-alone. I thought I would check before rolling my own. My goal is not to draw cartographic maps, but more like this picture: http://www.fineconnection.com/files/images/GraphicalNM.PNG, or if you are familiar with Edward Tufte's books, the data-visualization mechanisms he describes such as a map of a metro or subway. Also, if you have had any experience rendering these types of user interfaces or usage of underlying datastructures, I would be grateful to hear any thoughts you have on the subject, advice, any "gotchas." Thank you very for your time, -bn

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• UIWebView memory management

  - by wolfrevo

  Hello, I have a problem with memory management. I am developing an application that makes heavy use of UIWebView. This app generates dynamically lots of UIWebViews while loading content from my server. Some of these UIWebViews are quite large and have a lot of pictures. If I use instruments to detect leaks, I do not detect any. However, lots of objects are allocated and I suspect that has to do with the UIWebViews. When the webviews release because no longer needed, it appears that not all memory is released. I mean, after a request to my server the app creates an UITableView and many webviews (instruments say about 8Mb). When user tap back, all of them are released but memory usage only decrements about 2-3 Mb, and after 5-10 minutes using the app it crashes. Am I missing something? Anyone know what could be happening? Thank you!

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• How to efficiently track my geolocation during traveling using iPhone

  - by Peter Kruithof

  I'm going to travel through Thailand and I want to keep track of my location to geotag photos afterwards taken with a digital camera (iPhone's camera is not good enough). There are two things that are important here: I don't want to update manually I want the battery to last as long as possible, since the times I will be able to charge will be scarce I've thought about creating a web page that periodically sends my geolocation to a script that stores it in a database, but I don't know if GPS data is available in Mobile Safari. Second, I want the data I send to be as small as possible, and the frequency this is done s few as possible, because of the pricing of mobile data usage abroad. Any suggestions what would be a good solution here?

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• Spring: Using "Lookup method injection" for my ThreadFactory looks not scalable.

  - by Michael Bavin

  Hi, We're building a ThreadFactory so everytime a singleton controller needs a new thread, i get a new instance everytime. Looking at Lookup method injection looks good but what if we have multiple threads. like: public abstract class ThreadManager { public abstract Thread createThreadDoA(); public abstract Thread createThreadDoB(); } and config: <bean id="threadManager" class="bla.ThreadManager" singleton="true"> <lookup-method name="createThreadA" bean="threadA" /> <lookup-method name="createThreadB" bean="threadB"/> </bean> <bean id="threadA" class="bla.ThreadA"> <bean id="threadB" class="bla.ThreadB"> and usage: threadManager.createThreadA(); I don't want to create an abstract "create" method for every new threadclass. Is it possible to make this generich like: threadManager.createThread(ThreadA.class); Thank you

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• JQuery: NOT using document.ready and inserting HTML Tags = is this allowed?

  - by jens

  Hello, is this a valid JQuery usage pattern to : <script type="text/javascript"> $("body").prepend('<input type="hidden" id="error" value="show">'); </script> That is using Jquery to manipulate / insert HTML Tags when the Document has NOT YET been loaded (by not using document.ready for the inserting into the DOM)? (Normally I only use document.ready, but in this case I need to insert some Information into the DOM that then is present, when document.ready is called. This is some kind of "happens-before" relations ship I want to achieve so that I am shure when document.ready is called the inserted Form field is available in the document, as I depend on that information. Thank you very much jens

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• Java servlet and JSP accessing the same session bean

  - by Mykola Golubyev

  Let's say I have simple Login servlet that checks the passed name and creates User object and stores it in a session. User user = new User(); user.setId(name); request.getSession().setAttribute("user", user); response.sendRedirect("index.jsp"); In the index.jsp page I access the user object through jsp:useBean <jsp:useBean id="user" scope="session" class="package.name.User"/> <div class="panel"> Welcome ${user.id} </div> It works so far. The question: is this a valid usage or it is just current implementation uses the same name as the jsp bean id when stores and looks for a bean in a session?

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• rails using jruby 1.5 - slow!!

  - by gucki

  Hi! I'm currently using passenger with ree 1.8.7 in production for a rails 2.3.5 project using postgresql as a database. ab -n 10000 -c 100: 285.69 [#/sec] (mean) I read jruby should be the fastest solution, so I installed jruby-1.5.0.rc2 together with jdbc postgres adapter and glassfish. As the performance is really poor, I also started running my application using "jruby --server -J-Druby.jit.threshold=0 script/server -e production". Anyway, I only get ab -n 10000 -c 100: 43.88 [#/sec] (mean) Thread_safe! is activated in my rails config. Java seems to use all cores, cpu usage is around 350% (top). ruby -v: jruby 1.5.0.RC2 (ruby 1.8.7 patchlevel 249) (2010-04-28 7c245f3) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_16) [amd64-java] I wonder what I'm doing wrong and how to get better performancre with jruby than with ree? Thanks, Corin

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• How to temporarily disable read-only 2nd level cache hibernate strategy in Grails ?

  - by fabien7474

  In my grails application, some of my domain classes will never be changed by Users. However, some maintenance work is sometimes necessary, and administrator should be able to create/edit few instances from time to time (let's say twice a year). I would like to set a read-only 2nd level cache strategy for these domain classes (static mapping = { cache usage: 'read-only' } ) AND I would like to be able to 'disable' (in very particular situations) the read-only strategy in order to udate some instances via Grails scaffolding edit view. Is it possible? What do you advise me to do? EDIT: The solution I am implementing is a mix of Pascal and Burt answers (see comments). Both answers are great and helpful. So I got a dilemna for choosing the accepted answer! Anyway, thank you.

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• Stack memory in Android

  - by Matt

  I'm writing an app that has a foreground service, content provider, and a Activity front end that binds to the service and gets back a List of objects using AIDL. The service does work and updates a database. If I leave the activity open for 4-8+ hours, and go to the "Running Services" section under settings on the phone (Nexus One) an unusually large amount of memory being used is shown (~42MB). I figure there is a leak. When I check the heap memory i get Heap size:~18MB, ~2MB allocated, ~16MB free. Analyzing the hprof in Eclipse MAT seems fine, which leads me to theorize that memory is leaking on the stack. Is this even possible? If it is, what can I do to stop or investigate the leak? Is the reported memory usage on the "Running Services" section of android even correct (I assume it is)? Another note: I have been unable to reproduce this issue when the UI is not up (with only the service running)

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• Coding guidelines + Best Practices?

  - by Chathuranga Chandrasekara

  I couldn't find any question that directly applies to my query so I am posting this as a new question. If there is any existing discussion that may help me, please point it out and close the question. Question: I am going to do a presentation on C# coding guidelines but it is not supposed to limit to coding standards. So I have a rough idea but I think I need to address good programing practices. So the contents will be something like this. Basic coding standards - Casing, Formatting etc. Good practices - Usage of Hashset over other data structures, String vs String Builder, String's immutability and using them effectively etc Really I would like to add more good practices (Especially to improve the performance.) So like to hear some more good practices to be used with C#. Any suggestions??? (No need of large descriptions :) Just the idea is sufficient.)

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• Java Meta Search Engine API

  - by Loki

  I'm currently researching Java libraries to help in building a meta type search engine in the sense of being able to replace any given search engine in the back-end of the application or to simultaneously search using multiple search engines. I'm not interested in the GUI part here, just the generalization of search engine APIs and usage. I'd like to know about the common libraries used to achieve this task and if there are any common patterns used in this case. I imagined that this problem is common enough to be able to find plenty of stuff on Google, but it seems like search is a very proprietary domain and not much information is fed back to the community.

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• In your experience, what has inspired you to change a fundamental programming tool

  - by Dr J

  A lot of what I am working on is changing the mindset of a community of developers. Moving them from one tool to another, or to picking up a new tool. What are some of the suggested or recommended ways to get a community to pick up a new meme? While we can mandate tool usage, this is a last resort. I would rather have the developers move to any new tools of their own accord. I'm not a programmer, I need to understand why a programmer will move from one tool to another. Edited the title thanks to a fabulous comment! My world runs on Meme's, tipping points, and general pressures. This is why I needed to ask. And clarifying yet more- I am the middle manager needing to plan and manage an implementation and not a sales person.

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• Are there any widespread, modern Java coding conventions?

  - by brianegge

  Sun's "Code Conventions for the Java Programming Language" was last updated April 1999. Ten years later a lot has changed in the language, as well as general usage patterns. Are there more up to date, widely adopted standards? Most guidelines omit specifying file encoding and line endings. Sun recommends mixed tabs and spaces. The Eclipse IDE defaults to Eclipse's standard, which is tabs only. The Maven style guide is spaces only. Many style guides, such as JBoss, follow Sun's guidelines, but prefer K&R braces instead of OTBS. Each Apache project has it's own style guide, with slight differences between each one.

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• Virtual dedicated surver repetitive draining RAM, OOM constantly

  - by Deerly

  My linux (fedora red hat 7) virtual dedicated server has been experiencing OOM multiple times a day for the past several days. I thought the issue was with spamd/spamassassin but after disabling this the errors remains. The highest usage displayed on ps faux --cumulative: USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 28412 8.7 0.5 309572 109308 ? Sl 22:15 0:17 /usr/java/jdk1. mysql 7716 0.0 0.0 136256 18000 ? Sl 22:12 0:00 _ /usr/libexe named 17697 0.0 0.0 120904 15316 ? Ssl 22:09 0:00 /usr/sbin/named I'm not running any java applications so I'm not sure why the top issue is showing up. It is frustrating as I barely have anything running on the server and use the tiniest fraction of bandwidth. Any help or suggestions on zeroing in on the source of the drain would be much appreciated! Thanks!

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• Incorporating MIT/X11 licensed code into project

  - by Yktula

  I'm rewriting a small MIT-licensed program in C, and I intend to copy a segment from it (though not verbatim) that prints usage information and such things. The programs are going to behave, for the most part, the same, but the implementations are going to be much different. What is the best way to incorporate this code into my program, whether it's licensed under Apache 2, GPLv2/3, or under the MIT license? My guess is that for the first two listed I'd just add the original authors name to the NOTICE file along with relevant information and paste the license header as a comment above the derived code, and for the latter I'd just add the original author's copyright statement above my own.

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• Coding guidelines + Best Practises?

  - by Chathuranga Chandrasekara

  I couldn't find any question that directly applies to my query so I am posting this as a new question. If there is any existing discussion that may help me, please point it out and close the question. Question: I am going to do a presentation on C# coding guidelines but it is not supposed to limit to coding standards. So I have a rough idea but I think I need to address good programing practices. So the contents will be something like this. Basic coding standards - Casing, Formatting etc. Good practices - Usage of Hashset over other data structures, String vs String Builder, String's immutability and using them effectively etc Really I would like to add more good practices (Especially to improve the performance.) So like to hear some more good practices to be used with C#. Any suggestions??? (No need of large descriptions :) Just the idea is sufficient.)

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• Modifying setup file with PHP

  - by Paul Lammertsma

  I have an application that needs branding when downloaded in certain continents. When installed in North America, for instance, the application, when run, displays a different logo and company name than in Europe. The setup file is provided through a PHP script. Presently there is a Inno Setup executable for Windows and a DMG for Mac OS X. I have seen that when downloading Google Chrome, you can specify whether or not it should send usage statistics. A brief look at the JavaScript that controls it reveals that this is simply sent back to the server with &usagestats=0 or &usagestats=1. How would I go about influencing the installation based upon settings specified via the PHP download page?

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• Load testing a quicktime streaming server from ubuntu machine

  - by ebeland

  I have software that can launch and control multiple firefox browsers on Ubuntu EC2 images. I need to run a small load test against a QuickTime Streaming server. The stream starts automatically when loaded in a browser that has the QuickTime plugin, so I don't need to automate the stream once it starts. Alternately, I can also make these machines run arbitrary ruby code or executables. How can I get these ubuntu machines to pull in the stream? Also, how can I capture bandwidth usage (maybe a shell script?) on the worker machines?

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• Memory Efficient file append

  - by lboregard

  i have several files whose content need to be merged into a single file. i have the following code that does this ... but it seems rather inefficient in terms of memory usage ... would you suggest a better way to do it ? the Util.MoveFile function simply accounts for moving files across volumes private void Compose(string[] files) { string inFile = ""; string outFile = "c:\final.txt"; using (FileStream fsOut = new FileStream(outFile + ".tmp", FileMode.Create)) { foreach (string inFile in files) { if (!File.Exists(inFile)) { continue; } byte[] bytes; using (FileStream fsIn = new FileStream(inFile, FileMode.Open)) { bytes = new byte[fsIn.Length]; fsIn.Read(bytes, 0, bytes.Length); } //using (StreamReader sr = new StreamReader(inFile)) //{ // text = sr.ReadToEnd(); //} // write the segment to final file fsOut.Write(bytes, 0, bytes.Length); File.Delete(inFile); } } Util.MoveFile(outFile + ".tmp", outFile); }

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• setTimeout(fun) with a single argument

  - by Elazar Leibovich

  The HTML5 specifications states that setTimeout can be run without the additional "timeout" argument which is supposed to say after how many milliseconds will the function "handler" be scheduled. handle = window . setTimeout( handler [, timeout [, arguments ] ] ) Schedules a timeout to run handler after timeout milliseconds. Any arguments are passed straight through to the handler. However, I failed to find anywhere which explains what happens when no "timeout" time period is set. An example usage is, the animation implementation int the Raphael library. animationElements[length] && win.setTimeout(animation);

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• PHP Doctrine: Filter Table?

  - by ropstah

  I'm still not convinced after my previous question and some experience. Requirements: I don't want to use an SQL query everytime a filterBy() function is called and still be able to call -filterBy() on the returned table. Please find the comment @ ObjectsTable class: "How to instantiate another table and add records which match the filter criteria?" Usage: $globaltable = new ObjectsTable(); //globally accessible variable $globaltable->findAll(); //this call is made once at the beginning of the request $globaltable->filterBy('somefield', $someValue); //this function is used all over the place ObjectsTable class: class ObjectsTable extends Doctrine_Table { function filterBy($field, $value) { //How to instantiate another table and add records which match the criteria? } }

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