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• What is a good open source job scheduler in Java?

  - by Boaz

  Hi, In an application harvesting (many) RSS feeds, I want to dynamically schedule the feed downloaders based on the following criteria: The speed at which content are generated - source which produce content at a higher rate need to be visited more often. After downloading a feed, its content is analyzed and based on the current rate of publication the next run time is determined for the feed. Note that this is dynamically changing. Sometimes a feed is very active and sometimes it is slow. Every RSS feed should be visited at least once an hour. While the second one is done by most schedulers but the first one is more problematic. What JAVA-based open source scheduler would you recommend for the task? (and why ;) ) Thanks! Boaz

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• Growable data structure in MATLAB

  - by rlbond

  I need to create a queue in matlab that holds structs which are very large. I don't know how large this queue will get. Matlab doesn't have linked lists, and I'm worried that repeated allocation and copying is really going to slow down this code which must be run thousands of times. I need some sort of way to use a growable data structure. I've found a couple of entries for linked lists in the matlab help but I can't understand what's going on. Can someone help me with this problem?

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• What is the fastest way to display an image in QT on X11 without OpenGL?

  - by msh

  I need to display a raw image in a QT widget. I'm running X11 on a framebuffer, so OpenGL is not available. Both the image and the framebuffer are in the same format - RGB565, but I can change it to any other format if needed. I don't need blending or scaling. I just need to display pixels as is. I'm using QPainter::drawImage, but it converts QImage to QPixmap and this conversion seems to be very slow. Also it is backed by Xrender and I think there is unnecessary overhead required to support blending in Xrender which I don't really need Is there any better way? If it is not available in QT, I can use Xlib or any other library or protocol. I can modify the driver, X server or anything else.

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• Swing: what to do when a GUI update takes too long and freezes other GUI elements?

  - by java.is.for.desktop

  Hello, everyone! I know that GUI code in Java Swing must be put inside SwingUtilities.invokeAndWait or SwingUtilities.invokeLater. This way threading works fine. Sadly, in my situation, the GUI update it that thing which takes much longer than background thread(s). More specific: I update a JTree with about just 400 entries, nesting depth is maximum 4, so should be nothing scary, right? But it takes sometimes one second! I need to ensure that the user is able to type in a JTextPane without delays. Well, guess what, the slow JTree updates do cause delays for JTextPane during input. It refreshes only as soon as the tree gets updated. I am using Netbeans and know empirically that a Java app can update lots of information without freezing the rest of the UI. How can it be done? NOTE 1: All those DefaultMutableTreeNodes are prepared outside the invokeAndWait. NOTE 2: When I replace invokeAndWait with invokeLater the tree doesn't get updated.

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• How well does Scala Perform Comapred to Java?

  - by Teja Kantamneni

  The Question actually says it all. The reason behind this question is I am about to start a small side project and want to do it in Scala. I am learning scala for the past one month and now I am comfortable working with it. The scala compiler itself is pretty slow (unless you use fsc). So how well does it perform on JVM? I previously worked on groovy and I had seen sometimes over performed than java. My Question is how well scala perform on JVM compared to Java. I know scala has some very good features(FP, dynamic lang, statically typed...) but end of the day we need the performance...

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• jQuery color plugin: onMouseOver animation causes flickering in FF3.5.5

  - by rt-uk

  I'm trying to change the background color of a div on mouseover and mouseout. Instant change to yellow on MouseOver, and slow fade on MouseOut. function hilightel(keydiv) { $('#'+keydiv).animate({ backgroundColor: '#ffffd3' },1); } function lolightel(keydiv) { $('#'+keydiv).animate({ backgroundColor: '#ffffff' },300); } < div onMouseOver=javascript:highlightel('item1'); onMouseOut=javascript:lolightel('item1'); id='item1'CONTENT< /div When the mouse moves over text within the div, though, it thinks I've moused-out and so flickers badly. Alternatives that don't work: - animateToClass doesn't support background-color so I'm using the 'color' plugin - I hear that switchClass doesn't work in Chrome - Can't use .hover because their will be dynamically named divs in the page so need a general function Thanks in advance...

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• return false for parent javascript function

  - by jeerose

  $("#purchaser_contact").live('submit', function(){ $.ajax({ type: "POST", url: 'ajax/contactSearch.php', data: ({ fname: $("#fname").val(), lname: $("#lname").val(), city: $("#city").val(), state: $("#state").val() }), success: function(d) { var obj = JSON.parse( d ); if(obj.result != 0){ $("#contactSearch").remove(); $("#button-wrapper").before('<div id="contactSearch">' + obj.result + '</div>'); $("#contactSearch").slideToggle('slow'); //return false from submit!! }); }); I know there are other posts on this but I couldn't figure out how to apply them properly to my situation without making it messy. How do I return false on the submit event to prevent the form from submitting if I'm within the $.ajax and success functions? Thanks.

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• Matching First Alphanumeric Character skipping (The |An? )

  - by TheLizardKing

  I have a list of artists, albums and tracks that I want to sort using the first letter of their respective name. The issue arrives when I want to ignore "The ", "A ", "An " and other various non-alphanumeric characters (Talking to you "Weird Al" Yankovic and [dialog]). Django has a nice start '^(An?|The) +' but I want to ignore those and a few others of my choice. I am doing this in Django, using a MySQL db with utf8_bin collation. EDIT Well my fault for not mentioning this but the database I am accessing is pretty much ready only. It's created and maintained by Amarok and I can't alter it without a whole mess of issues. That being said the artist table has The Chemical Brothers listed as The Chemical Brothers so I think I am stuck here. It probably will be slow but that's not so much of a concern for me as it's a personal project.

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• How to add multiple series in highcharts synchronously

  - by leonlong

  I tried to add multiple series in highcharts synchronously, but the response time is very slow. It took almost 3-5 seconds to display the charts. Here is part of the code. while(chart.series.length>0){ chart.series[0].remove(true); } chart.addSeries(series1); chart.addSeries(series2); chart.addSeries(series3); chart.addSeries(series4); chart.addSeries(series5); When I remain only one addSeries command, it response immediately, so I realized it may be the problem of add multiple series in highcharts synchronously. Not so good at highcharts, so is there anyone could help me about this? Or maybe there is another way to do this, I am much appreciated.

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• How to force programs out of swap file when a resources-intensive batch finishes?

  - by sharptooth

  We use employees' desktops for CPU-intensive simulation during the night. Desktops run Windows - usually Windows XP. Employees don't log off, they just lock the desktops, switch off their monitors and go. Every employee has a configuration file which he can edit to specify when he is most likely out of office. When that time comes a background program grabs data for simulation from the server, spawns worker processes, watches them, gets results and sends them to the server. When the time specified by the employee elapses simulation stops so that normal desktop usage is not interfered. The problem is that simuation consumes a lot of memory, so when the worker processes run they force other programs into the swap file. So when the employee comes all the programs he left are luggish and slow until he opens them one by one so that they are unswapped. Is there a way the program can force other programs out of swap file when it stops simulation so that they again run smoothly?

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• Finding changes in MongoDB database

  - by Jonathan Knight

  I'm designing a MongoDB database that works with a script that periodically polls a resource and gets back a response which is stored in the database. Right now my database has one collection with four fields , id, name, timestamp and data. I need to be able to find out which names had changes in the data field between script runs, and which did not. In pseudocode, if(data[name][timestamp]==data[name][timestamp+1]) //data has not changed store data in collection 1 else //data has changed between script runs for this name store data in collection 2 Is there a query that can do this without iterating and running javascript over each item in the collection? There are millions of documents, so this would be pretty slow. Should I create a new collection named timestamp for every time the script runs? Would that make it faster/more organized? Is there a better schema that could be used? The script runs once a day so I won't run into a namespace limitation any time soon.

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• Clone LINQ To SQL object Extension Method throws object dispose exception....

  - by gtas

  Hello all, I have this extension method for cloning my LINQ To SQL objects: public static T CloneObjectGraph<T>(this T obj) where T : class { var serializer = new DataContractSerializer(typeof(T), null, int.MaxValue, false, true, null); using (var ms = new System.IO.MemoryStream()) { serializer.WriteObject(ms, obj); ms.Position = 0; return (T)serializer.ReadObject(ms); } } But while i carry objects with not all references loaded, while qyuerying with DataLoadOptions, sometimes it throws the object disposed exception, but thing is I don't ask for references that is not loaded (null). e.g. I have Customer with many references and i just need to carry on memory the Address reference EntityRef< and i don't Load anything else. But while i clone the object this exception forces me to load all the EntitySet< references with the Customer object, which might be too much and slow down the application speed. Any suggestions?

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• Find Loding performance of the Website

  - by pandora

  How to find the site performance, there is a tools like YSLOW, Speed traker in google that shows the speed of the website. I have done a php project on LMS with Zend Framework, Everything is in live. When user post contents for a subject that may be size 200K and submitted to the server takes too slow. Sometime server may get DOWN. I login to server(PUTTY) and checked i found that there is more resource occupied in my server. It uses full memory on the server. When i cleared the resource the site loads well. Site is in Dedicated server with 3 more domains with 4GB Ram. Because of this LMS website all the website gets down. I need to check what is wrong in my website. How do i Start?

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• Faster forking of large processes on Linux ?

  - by timday

  What's the fastest, best way on modern Linux of achieving the same effect as a fork-execve combo from a large process ? My problem is that the process forking is ~500MByte big, and a simple benchmarking test achieves only about 50 forks/s from the process (c.f ~1600 forks/s from a minimally sized process) which is too slow for the intended application. Some googling turns up vfork as having being invented as the solution to this problem... but also warnings about not to use it. Modern Linux seems to have acquired related clone and posix_spawn calls; are these likely to help ? What's the modern replacement for vfork ? I'm using 64bit Debian Lenny on an i7 (the project could move to Squeeze if posix_spawn would help).

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• Visual Studio 2010 ClickOnce prerequisites from same location

  - by muhan

  I'm using clickonce publishing and want to require .net 3.5 framework and others as prerequisites. I have selected the option to download the prerequisites from same folder as my app. I've also placed the .net 3.5 redistributable exe in the folder on the server where the app will be published. I publish by FTP over the internet to the server where the users are. However, VS will not let me publish saying it can't find the prerequisites on disk. Does this mean I have to have the prerequisites installed somewhere on my developer machine and that those files will all be uploaded by FTP to the server everytime I publish a new version to the server? That would be a huge amount of data to upload over my slow DSL upload link. Any insight?

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• How well does Solr scale over large number of facet values?

  - by Continuation

  I'm using Solr and I want to facet over a field "group". Since "group" is created by users, potentially there can be a huge number of values for "group". Would Solr be able to handle a use case like this? Or is Solr not really appropriate for facet fields with a large number of values? I understand that I can set facet.limit to restrict the number of values returned for a facet field. Would this help in my case? Say there are 100,000 matching values for "group" in a search, if I set facet.limit to 50. would that speed up the query, or would the query still be slow because Solr still needs to process and sort through all the facet values and return the top 50 ones? Any tips on how to tune Solr for large number of facet values? Thanks.

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• Slowness of Netbeans Platform Apps - how to mitigate?

  - by user559298

  Hi, We are developing a commerical application (pretty complex) in java using Netbeans IDE. We have 2 options in netbeans to create it- 1. Develop Java desktop app 2. Netbeans Platform app We have requirement that application startup and response times should be very very fast, should be modular etc. We did Proof of Technology by creating apps using both approaches mentioned above. We found Netbeans platform apps are very slow during startup and during screen navigation compared to pure Swing based desktop apps. We tried to implement suggestions provided at http://wiki.netbeans.org/Category:Performance:FAQ and in other blogs and forums to improve on speed of the app but were not successful. We feel for creating a complex desktop app Netbeans platform app would be better suited, but its not meeting our performance requirements (startup and response times, memory footprints, CPU usage guidelines etc). Can any one guide us on how to mitigate our problem of improving performance of Netbeans Platforms apps? Thanks in advance for your help. -bhan

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• Updating Silverlight with data. JSON or WCF?

  - by Alastair Pitts

  We will be using custom Silverlight 4.0 controls on our ASP.NET MVC web page to display data from our database and was wondering what the most efficient method was? We will be having returned values of up to 100k records (of 2 properties per record). We have a test that uses the HTML Bridge from Javascript to Silverlight. First we perform a post request to a controller action in the MVC web app and return JSON. This JSON is then passed to the Silverlight where it is parsed and the UI updated. This seems to be rather slow, with the stored procedure (the select) taking about 3 seconds and the entire update in the browser about 10-15sec. Having a brief look on the net, it seems that WCF is another option, but not having used it, I wasn't sure of it's capability or suitability. Does anyone have any experiences or recommendations?

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• Does Seaside scale?

  - by Richard Durr

  Seaside is known as "the heretical web framework". One of the points that make it heretical is that it has much shared state. That however is something which, in my current understanding, hinders easy scaling. Ruby on rails on the other hand shares as less state as possible. It has been known to scale pretty well, even if it is dog slow compared to modern smalltalk vms. flickr uses php and has scaled to an extremly big infrastructure... So has anybody some experience in the scaling of Seaside?

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• Detecting GWT RichTextArea 'dirty' state

  - by David

  I want to detect when the contents of my GWT RichTextArea become 'dirty' (have been changed by the user) in order to enable a 'save' button accordingly. I suppose I could listen for key presses that are likely to have changed the contents; but browser support for key presses is notoriously quirky. I suppose I could, before editing begins, save the original contents in a variable, and upon key press, compare the current contents against that variable, but doing that on each key press is going to be really slow. Is there some neat way to achieve RichTextArea dirty-detection?

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• Android Reading from an Input stream efficiently

  - by RenegadeAndy

  Hey, I am making an HTTP get request to a website for an android application I am making. I am using a DefaultHttpClient and using HttpGet to issue the request. I get the entity response and from this obtain an InputStream object for getting the html of the page. I then cycle through the reply doing as follows: BufferedReader r = new BufferedReader(new InputStreamReader(inputStream)); String x = ""; x = r.readLine(); String total = ""; while(x!= null){ total += x; x = r.readLine(); } However this is horrendously slow. Is this inefficient? I'm not loading a big web page - www.cokezone.co.uk so the file size is not big. Is there a better way to do this? Thanks Andy

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• Create pdf file dynamically in vb.net for .net 1.1 framework

  - by Urbycoz

  I need to create a pdf file dynamically in vb.net. It needs to contain several images and lines of text. I am using VS 2003, so whatever solution I use will need to be compatible with the .net 1.1 framework. The current method I am using is wpcubed, but this requires that all images be converted to bmp format before adding them to the pdf, which can be extremely slow when dealing with a large number of images. I am aware that there are an awful lot of other 3rd party products that claim to do this, and I have had a search through them. But without registering, downloading, installing and writing code to use each of them in turn, it is very difficult to differentiate between them. So far I have looked into evo pdf and pdfsharp but neither seem to work with .net 1.1. (Although they don't make this abundantly clear.) Has anyone else found a method that works and they would recommend (a free one-if possible)?

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• how to speed up the code??

  - by kaushik

  in my program i have a method which requires about 4 files to be open each time it is called,as i require to take some data.all this data from the file i have been storing in list for manupalation. I approximatily need to call this method about 10,000 times.which is making my program very slow? any method for handling this files in a better ways and is storing the whole data in list time consuming what is better alternatives for list? I can give some code,but my previous question was closed as that only confused everyone as it is a part of big program and need to be explained completely to understand,so i am not giving any code,please suggest ways thinking this as a general question... thanks in advance

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• Suggest an Alternative for glTranslate() load on CPU.

  - by Nagaraj

  I have been working on a project of OpenGL. Here I just display a boat moving along with some option's for view change.. Its a 2D program. The thing is I have used many glTranslate functions for moving the boat in the code. It works properly in Windows(DEV-CPP) but when executed in Fedora it has a very very very slow movement for boat. When checked for the CPU LOAD it was huge. So any thing which i can try to move the boat faster? Please help :)

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• How to optimize this Linq query

  - by Luke101

  I am trying to optimize this query. It is not slow for now but I am expecting a spike to hit this query in the near future. Is there anything else i can do to make this query faster? var posts = from p in context.post where p.post_isdeleted == false && p.post_parentid == null select new { p.post_date, p.post_id, p.post_titleslug, p.post_title, p.post_descriptionrender, p.userinfo.user_username, p.userinfo.user_userid, p.userinfo.user_GravatarHash, p.userinfo.user_points, p.category.catid, p.category.name, p.post_answercount, p.post_hasbestanswer, p.post_hits, p.post_isanonymous, p.post_votecount, FavoriteCount = context.favorites.Where(x => x.post.post_id == p.post_id).Count(), tags = from tg in context.posttag where tg.posttag_postid == p.post_id select new { tg.tag.tag_id, tg.tag.tag_title } };

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