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• mongodb read/write performance and mongo hosting in the cloud

  - by z3cko

  we are currently developing a high traffic rails application with facebooker (facebook game). since amazon simpledb (aws-sdb) is really slow, we are thinking of using a dedicated mongodb server as offered by mongoHQ for example. questions: what is the read/writes peak value for a mongodb server running on a amazon ec2 instance? what would be a recommended setup for a ec2 hosted app with mongodb - a master on amazon EBS and replicas on the ec2 instances? any examples or experiences? is there a company that offers mongodb hosting in the cloud? thanks, mz

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• Best method to compress JSON string in term of performance and compress radio

  - by Eric Yin

  For a JSON string, contains all kinds of settings, numbers, string etc. Total JSON string fairly fall into 10k~50K range. I want to compress it before save to database. So I wonder which compress method should I choose, I am using c# 4, I know I can choose gzip and deflate but the compression radio is not good (although speed is good). More specific, compress can be a little slow (since only once) but should be small. Decompress should be lighting fast since decompress happens lots. Please give some advice.

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• T-SQL: Dynamic Where clause in normal SQL statement

  - by Torben H.

  Hey there, I looking for a way to dynamicly add a filter to my statment without using dynamic SQL. I want to select all computers from a table, but when I pass a computer id to the sp, I want to get only this computer. Actually I try this on DECLARE @ComputerFilter AS INT DECLARE @ComputerID AS INT SELECT Computername FROM Computer WHERE (ComputerID = @ComputerID) OR (@ComputerFilter IS NULL)) But this is 100 times slow then this statment and tooks as long as SELECT * FROM Computer SELECT Computername FROM Computer WHERE ComputerID = @ComputerID Is there a way to speed this statment up or is there any other way to solve this problem with one select und without dynamic sql?

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• Java paint speed relative to color model

  - by Jon

  I have a BufferedImage with an IndexColorModel. I need to paint that image onto the screen, but I've noticed that this is slow when using an IndexColorModel. However, if I run the BufferedImage through an identity affine transform it creates an image with a DirectColorModel and the painting is significantly faster. Here's the code I'm using AffineTransformOp identityOp = new AffineTransformOp(new AffineTransform(), AffineTransformOp.TYPE_BILINEAR); displayImage = identityOp.filter(displayImage, null); I have three questions 1. Why is painting the slower on an IndexColorModel? 2. Is there any way to speed up the painting of an IndexColorModel? 3. If the answer to 2. is no, is this the most efficient way to convert from an IndexColorModel to a DirectColorModel? I've noticed that this conversion is dependent on the size of the image, and I'd like to remove that dependency. Thanks for the help

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• .NET Data Adapter Timeout SP Issue

  - by A-B

  We have a SQL Server stored procedure that runs fine in SQL Manager directly, does a rather large calculation but only takes 50-10 seconds max to run. However when we call this from the .NET app via a data adapter it times out. The timeout however happens before the timeout period should, we set it to 60 seconds and it still times out in about 20 seconds or less. I've Googled the issue and seen others note issues where a SP works fien directly but is slow via a data adpater call. Any ideas on how to resolve this?

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• With Eclipse, in a PHP project with SVN, how to "tell" Eclipse to find autocompletion choice only in

  - by ranskalainen

  Hello, Using Eclipse on a PHP Project, I recently created a tag on my SVN. Since that day, let's say I'm working on a class in my trunk, when I ctrl+space in my code, Eclipse is getting really really slow (sometimes even freeze), and if I'm lucky, it will give me 2 responses for autocompletion : One referencing some method/class from the tag, one referencing method/class from the trunk. But right now, only the reference from the trunk would be useful for me. Is there a way to limit where Eclipse parse the code to give back autocompletion suggestion ? Thank you

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• Php PEAR, Database Abstraction & Factory Methods

  - by pws5068

  I'm interested in learning more about design practices in PHP for Database Abstraction & Factory methods. For background, my site is a special-interest social networking community currently in beta mode. Currently, I've started moving my old code for object retrieval to factory methods. However, I do feel like I'm limiting myself by keeping a lot of SQL table names and structure separated in each function/method. Questions: 1.) Is there a reason to use PEAR (or similar) if I dont anticipate switching databases? 2.) Can PEAR interface with the MySqli prepared statements I currently use? 3.) Will it help me separate table names from each method? (If no, what other design patterns might I want to research?) 4.) Will it slow down my site once I have a significantly large member base?

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• Please suggest some alternative to Drupal

  - by abovesun

  Drupal propose completely different approach in web development (comparing with RoR like frameworks) and it is extremely good from development speed perspective. For example, it is quite easy to clone 90% of stackoverflow functionality using Drupal. But it has several big drawbacks: it is f''cking slow (100-400 requests per page) db structure very complicated, need at least 2 tables for easy content (entity) type, CCK fields very easy generate tons of new db tables anti-object oriented, rather aspect-oriented bad "view" layer implementation, no strange forward layouts and so on. After all this items I can say I like Drupal, but I would like something same, but more elegant and more object oriented. Probably something like http://drupy.net/ - drupal emulation on the top of django. P.S. I wrote this question not for new holy word flame, just write if you know alternative that uses something similar approach.

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• Designing a Tag table that tells how many times it's used

  - by Satoru.Logic

  Hi, all. I am trying to design a tagging system with a model like this: Tag: content = CharField creator = ForeignKey used = IntergerField It is a many-to-many relationship between tags and what's been tagged. Everytime I insert a record into the assotication table, Tag.used is incremented by one, and decremented by one in case of deletion. Tag.used is maintained because I want to speed up answering the question 'How many times this tag is used?'. However, this seems to slow insertion down obviously. Please tell me how to improve this design. Thanks in advance.

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• Maximum number of files one ext3 directory while still getting acceptable performance?

  - by knorv

  I have an application writing to an ext3 directory which over time has grown to roughly three million files. Needless to say, reading the file listing of this directory is unbearably slow. I don't blame ext3. The proper solution would have been to let the directory write to sub-directories such as ./a/b/c/abc.ext rather than just ./abc.ext. I'm changing to such a sub-directory structure and my question is simply: roughly how many files should I expect to store in one ext3 directory while still getting acceptable performance? Or in other words; assuming that I need to store three million files in the structure, how many levels deep should the ./a/b/c/abc.ext structure be? Obviously this is a question that cannot be answered exactly, but I'm looking for a ball park estimate.

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• Any way of working with Eclipse WTP that does not mean redeploying the _WHOLE_ application when a J

  - by Thorbjørn Ravn Andersen

  I have migrated a Web Application from MyEclipse to Eclipse WTP, and I am now in the middle of the first major upgrade to the code base and web pages after the migration, and it is frankly driving me mad that saving a JSP page causes a redeployment of the WHOLE application, as it takes time and that my backend connection does not survive the serialization-deserialization of the session object (which is non-trivial to fix). In addition to that the JSP-editor is insanely slow so I frequently have to pause to let the editor catch up to be certain where my edits go in a small JSP using JavaServer Faces. Disabling validation did not help. The Eclipse Dynamic Web Project depends on several library eclipse projects so I cannot just tell e.g. Jetty to use the WebRoot folder, as several dependencies are then missing from the classpath. The question is: Is there a way of working - ANY way of working - with the Eclipse WTP system that does NOT imply redeploying everything every time any file is saved? I can use Tomcat 5.5 or Jetty 6 as servers.

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• jQuery droppable accordion

  - by awshepard

  I've been playing around with trying to create a droppable accordion for a little while, and haven't gotten it to be very responsive. When I drag an item over the accordion, it takes 5+ seconds for the accordion element to open (if it does at all). Sometimes I have to "wave" the dragged element over the accordion element. I know I read something a while back about event processing in javascript - something along the lines of the browser not always passing control to the javascript engine when you think it does, or something like that, resulting in weird timing. Has anyone else seen tried to do this before? Have you found jquery/javascript to be this slow? Do you have any references for how to get a responsive droppable accordion (the jQuery UI site doesn't seem to, and I didn't find anything on SO or Google). Thanks!

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• Fast word count function in Vim

  - by Greg Sexton

  I am trying to display a live word count in the vim statusline. I do this by setting my status line in my .vimrc and inserting a function into it. The idea of this function is to return the number of words in the current buffer. This number is then displayed on the status line. This should work nicely as the statusline is updated at just about every possible opportunity so the count will always remain 'live'. The problem is that the function I have currently defined is slow and so vim is obviously sluggish when it is used for all but the smallest files; due to this function being executed so frequently. In summary, does anyone have a clever trick for producing a function that is blazingly fast at calculating the number of words in the current buffer and returning the result?

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• Making DiveIntoPython3 work in IE8 (fixing a Javascript performance issue)

  - by srid

  I am trying to fix the performance problem with Dive Into Python 3 on IE8. Visit this page in IE8 and, after a few moments, you will see the following popup: I traced down the culprit down to this line in j/dip3.js ... find("tr:nth-child(" + (i+1) + ") td:nth-child(2)"); If I disable it (and return from the function immediately), the "Stop executing this script?" dialog does not appear as the page now loads fairly fast. I am no Javascript/jquery expert, so I ask you fellow developers as to why this query is making IE slow. Is there a fix for it? Edit: you can download the entire webpage (980K) for local viewing/editing.

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• jQuery fadeIn() not working in IE

  - by Rob Bennet

  [js] $(document).ready(function() { //Default Action $(".tab_content").hide(); //Hide all content $("ul.tabs li:first").addClass("active").show(); //Activate first tab $(".tab_content:first").show(); //Show first tab content //On Click Event $("ul.tabs li").click(function() { $("ul.tabs li").removeClass("active"); //Remove any "active" class $(this).addClass("active"); //Add "active" class to selected tab $(".tab_content").hide(); //Hide all tab content var activeTab = $(this).find("a").attr("href"); //Find the rel attribute value to identify the active tab + content $(activeTab).fadeIn("slow"); //Fade in the active content return false; }); }); [/js] Works in everything but IE?

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• Tinting iPhone application screen red

  - by btschumy

  I'm trying to place a red tint on all the screens of my iPhone application. I've experimented on a bitmap and found I get the effect I want by compositing a dark red color onto the screen image using Multiply (kCGBlendModeMultiply). So the question is how to efficiently do this in real time on the iPhone? One dumb way might be to grab a bitmap of the current screen, composite into the bitmap and then write the composited bitmap back to the screen. This seems like it would almost certainly be too slow. In addition, I need some way of knowing when part of the screen has been redrawn so I can update the tinting. I can almost get the effect I want by putting a red, translucent, fullscreen UIView above everything. That tints everything red within further intervention on my part, but the effect is much "muddier" than results from the composite. So do any wizards out there know of some mechanism I can use to automatically composite the red over the app in similar fashion to what the translucent red UIView does?

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• Improving the efficiency of Kinect for Windows DTWGestureRecognition Application

  - by Ray

  Currently I am using the DTWGestureRecognition open source tool for Kinect SDK v1.5. I have recorded a few gestures and use them to navigate through Windows 7. I also have implemented voice control for simple things such as opening PowerPoint, Chrome, etc. My main issue is that the application uses quite a bit of my CPU power which causes it to become slow. During gestures and voice commands, the CPU usage sometimes spikes to 80-90%, which causes the application to be unresponsive for a few seconds. I am running it on a 64 bit Windows 7 machine with an i5 processor and 8 GB of RAM. I was wondering if anyone with any experience using this tool or Kinect in general has made it more efficient and less performance hogging. Right now I removed sections which display the RGB video and the Depth video but even doing that did not make a big impact. Any help is appreciated, thanks!

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• Javascript tail recursion

  - by Misha Moroshko

  Why the following code runs so.... slow....... ? <html><body><script type="text/javascript"> var i = 0; f(); function f() { if (i == 5000) { document.write("Done"); } else { i++; tail(); } } function tail() { var fn = tail.caller; var args = arguments; setTimeout(function() {fn.apply(this, args)}, 0); }; </script></body></html>

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• What database works well with 200+GB of data?

  - by taw

  I've been using mysql (with innodb; on Amazon rds) because it's sort of universal default, but it's been ridiculously under-performing, and tweaking it only delays the inevitable. The data is mostly relatively short (<1kB of bytes each) blobs information about 100Ms of urls. There is (or should be, mysql cannot seem to handle it) very high amount of insert / update / retrieve but few complex queries - not that complex queries wouldn't be useful, but because mysql is so slow that it's far faster to get the data out, process it locally, and cache the results somewhere. I can keep tweaking mysql and throwing more hardware at it, but it seems increasingly futile. So what are the options? SQL/relational model/etc. optional - anything will do as long as it's fast, networked, and language-independent.

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• How to increse performance of raster scrolling on Mac ?

  - by Max

  I have a game with a big raster map Now we are using jpeg (4900x4200) And durring the game we need to scroll through this map. We use the following: Class Map extends mx.containers.Canvas and mx.controls.Image on it In constructor we have: public function Map() { super(); image.source = ResourceManager.interactiveManager.map;//big image addChild(image); ...... } for scrolling we are use: if(parentAsCanvas==null){ parentAsCanvas = (parent as Canvas); } parentAsCanvas.verticalScrollPosition = newX; parentAsCanvas.horizontalScrollPosition = newY; In windows, we have very good performance. In Linux and Mac in flashplayer we have a good performance too. But in browsers performance is quite slow! What can we do to resolve it?

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• SQL indexing on varchar

  - by alex

  I have a table whose columns are varchar(50) and a float - I need to (very quickly) look get the float associated with a given string. Even with indexing, this is rather slow. I know, however, that each string is associated with an integer, which I know at the time of lookup, so that each string maps to a unique integer, but each integer does not map to a unique string. One might think of it as a tree structure. Is there anything to be gained by adding this integer to the table, indexing on it, and using a query like SELECT floatval FROM mytable WHERE phrase=givenstring AND assoc=givenint? This is Postgres, and if you couldn't tell, I have very little experience with databases.

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• DesignMode with Controls

  - by John Dyer

  Has anyone found a useful solution to the DesignMode problem when developing controls? The issue is that if you nest controls then DesignMode only works for the first level. The second and lower levels DesignMode will always return FALSE. The standard hack has been to look at the name of the process that is running and if it is "DevEnv.EXE" then it must be studio thus DesignMode is really TRUE. The problem with that is looking for the ProcessName works its way around through the registry and other strange parts with the end result that the user might not have the required rights to see the process name. In addition this strange route is very slow. So we have had to pile additional hacks to use a singleton and if an error is thrown when asking for the process name then assume that DesignMode is FALSE. A nice clean way to determine DesignMode is in order. Acually getting Microsoft to fix it internally to the framework would be even better!

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• How to calculate real-time stats?

  - by Diego Jancic

  I have a site with millions of users (well, actually it doesn't have any yet, but let's imagine), and I want to calculate some stats like "log-ins in the past hour". The problem is similar to the one described here: http://highscalability.com/blog/2008/4/19/how-to-build-a-real-time-analytics-system.html The simplest approach would be to do a select like this: select count(distinct user_id) from logs where date>='20120601 1200' and date <='20120601 1300' (of course other conditions could apply for the stats, like log-ins per country) Of course this would be really slow, mainly if it has millions (or even thousands) of rows, and I want to query this every time a page is displayed. How would you summarize the data? What should go to the (mem)cache? EDIT: I'm looking for a way to de-normalize the data, or to keep the cache up-to-date. For example I could increment an in-memory variable every time someone logs in, but that would help to know the total amount of logins, not the "logins in the last hour". Hope it's more clear now.

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• Is this a correct Interlocked synchronization design?

  - by Dan Bryant

  I have a system that takes Samples. I have multiple client threads in the application that are interested in these Samples, but the actual process of taking a Sample can only occur in one context. It's fast enough that it's okay for it to block the calling process until Sampling is done, but slow enough that I don't want multiple threads piling up requests. I came up with this design (stripped down to minimal details): public class Sample { private static Sample _lastSample; private static int _isSampling; public static Sample TakeSample(AutomationManager automation) { //Only start sampling if not already sampling in some other context if (Interlocked.CompareExchange(ref _isSampling, 0, 1) == 0) { try { Sample sample = new Sample(); sample.PerformSampling(automation); _lastSample = sample; } finally { //We're done sampling _isSampling = 0; } } return _lastSample; } private void PerformSampling(AutomationManager automation) { //Lots of stuff going on that shouldn't be run in more than one context at the same time } } Is this safe for use in the scenario I described?

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• How to force Weblogic to start deployments in active state (i.e. not just prepared)

  - by doublep

  When I start a Weblogic instance with a deployed application, the deployment is sometimes left in prepared state, not in active state. I have to go to Weblogic Console and start the deployment manually, which is quite slow and annoying repetetive work. Since this is done on a development machine — sometimes 50 times a day, — there are no security implication as the server is only visible on the local network. Is there some way to have it always start the deployment active? Note that I'm not redeploying the application, I instead have it "constantly deployed" and stop/start the Weblogic instance using the scripts in bin directory.

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