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• removing duplicate strings from a massive array in java efficiently?

  - by Preator Darmatheon

  I'm considering the best possible way to remove duplicates from an (Unsorted) array of strings - the array contains millions or tens of millions of stringz..The array is already prepopulated so the optimization goal is only on removing dups and not preventing dups from initially populating!! I was thinking along the lines of doing a sort and then binary search to get a log(n) search instead of n (linear) search. This would give me nlogn + n searches which althout is better than an unsorted (n^2) search = but this still seems slow. (Was also considering along the lines of hashing but not sure about the throughput) Please help! Looking for an efficient solution that addresses both speed and memory since there are millions of strings involved without using Collections API!

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• XDebug, how to disable remote debugging for single .php file?

  - by Kirzilla

  Hello, I'm using Eclipse IDE + remote Xdebug. EclipseIDE is listening 9000 port for some kind of Xdebug information. There are some php scripts running by cron on server. So, every cron execution xdebug is sending information to my workstation and EclipseIDE is trying to find this file in my project. But file couldn't be find because cron running scrits do not relate to the project I'm working with. So, every cron run Eclipse IDE is alerting this message http://img2.pict.com/22/fc/86/3299517/0/screenshot2b142.png I've tried to add to cron executed php scripts some strings... if (function_exists('xdebug_disable')) { xdebug_disable(); } ... but it didn't helped. Any ideas? Thank you

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• Is it possible to cache JSP bytecode to avoid recompiles w/ Tomcat?

  - by Computer Guru

  Hi, Is there any way of caching the bytecode for JSP webapps/ In particular, using Tomcat as the Java servlet? I'm getting really fed up of Tomcat taking up all the CPU for 10 minutes while it compiles 4 different webapps every time I restart it.... I'm already using Jikes to "speed up" the compiles, but it's really killing me. The code does not change unless the webapp is upgraded (very rarely), and I cannot believe that there is no way to cache the compiled java bytecode instead of recompiling it each and every time. I'd appreciate any advice on the matter!

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• Reading and parsing email from Gmail using C#, C++ or Python

  - by jpnavarini

  I have to do a Windows application that from times to times access a Gmail account and checks if there is a new email. In case there is, it must read the email body and subject (a simple text email, without images or attachments). Please, do not use paid libs, and in case of any other libs used, give the download path. And I need the email body and subject only. So if the long and complex message that comes from Gmail could be parsed and only two strings containing the subject and the body, it would be perfect. Finally, I only have to get the new messages arrived since the last execution. So the read messages could be marked as "read" and only the new ones (marked as "new") are considered. The code can be written in Python or C++, but I prefer it in C#. Thank you for the help.

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• Mapping functions of 2D numpy arrays

  - by perimosocordiae

  I have a function foo that takes a NxM numpy array as an argument and returns a scalar value. I have a AxNxM numpy array data, over which I'd like to map foo to give me a resultant numpy array of length A. Curently, I'm doing this: result = numpy.array([foo(x) for x in data]) It works, but it seems like I'm not taking advantage of the numpy magic (and speed). Is there a better way? I've looked at numpy.vectorize, and numpy.apply_along_axis, but neither works for a function of 2D arrays. EDIT: I'm doing boosted regression on 24x24 image patches, so my AxNxM is something like 1000x24x24. What I called foo above applies a Haar-like feature to a patch (so, not terribly computationally intensive).

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• Eclipse takes ages to display breakpoint when running tomcat

  - by Ryan

  Hi, When tomcat hits a breakpoint in Eclipse, the execution thread stops, but the breakpoint takes absolutely ages to appear in Eclipse. The same is true if I try to inspect a variable; the first time takes about 2 minutes. After that, the debug session is fine. What with that and the CONSTANT need to keep re-publishing to tomcat every time I change something, it's driving me nuts. Does anybody have any ideas why it's so slow? Also, how can I stop tomcat restarting the webapp every time I try to change something during a debug session? I am sure it never used to do that... Eclipse is 3.3.1.1 with J2EE Standard Tools and Web Standard Tools. Tomcat is 5.5 Thanks a lot for any advice! Ryan

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• Is it possible to reference the Azure SDK 1.1 Microsoft.WindowsAzure.* assemblies from a .NET 4.0 Cl

  - by tjrobinson

  I have a WPF application targetting the .NET 4.0 Client Profile which needs to use the Microsoft.WindowsAzure.* assemblies provided in the Windows Azure SDK 1.1. The problem is that these assemblies have a runtime version of v2.0.50727. I am able to add references to them from my WPF project but they're not recognised. I've read about the side by side execution capabilities of .NET 4.0 but does this require both the .NET 2.0 and the .NET 4.0 frameworks to be installed? Is there anything from Microsoft on when a new SDK might be available that contains assemblies targeting .NET 4.0?

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• TIBRV: Remote vs Local RVD

  - by jsw

  When connected to a local RVD a sending application is shielded from network interruptions and the send message methods will only block for the time it takes for the message to reach the local RVD process. With remote RVD the sending application is no longer shielded from network interruptions and the send message methods will block for the time it takes to hop across the network to reach the remote RVD process. Is my understanding correct? The documentation is vague regarding remote daemons. I'm mostly concerned with how reliable and performant the send message will be from the perspective of a sending application. Introducing unnecessary blocking on the client side due to sending a message (especially a network hop) is a big no-no in this application. The speed at which the messages reach the consumer is not of the utmost importance. With this in mind is a remote RVD out of the question?

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• Is yield break equivalent to returning Enumerable<T>.Empty from a method returning IEnumerable<T>

  - by Mike Two

  These two methods appear to behave the same to me public IEnumerable<string> GetNothing() { return Enumerable.Empty<string>(); } public IEnumerable<string> GetLessThanNothing() { yield break; } I've profiled each in test scenarios and I don't see a meaningful difference in speed, but the yield break version is slightly faster. Are there any reasons to use one over the other? Is one easier to read than the other? Is there a behavior difference that would matter to a caller?

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• INNER JOIN vs LEFT JOIN performance in SQL Server

  - by Ekkapop

  I've created SQL command that use INNER JOIN for 9 tables, anyway this command take a very long time (more than five minutes). So my folk suggest me to change INNER JOIN to LEFT JOIN because the performance of LEFT JOIN is better, at first time its despite what I know. After I changed, the speed of query is significantly improve. I want to know why LEFT JOIN is faster than INNER JOIN? My SQL command look like below: SELECT * FROM A INNER JOIN B ON ... INNER JOIN C ON ... INNER JOIN D and so no

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• router connect configuration in cakephp 1.3

  - by Gaurav Sharma

  Hello everyone, I have defined the following rule in the router.php file of my cakephp 1.3 based application Router::connect('/tags/*',array('plugin' => 'tags', 'controller' => 'Tags', 'action' => 'index', 'admin' => false)); I have used the tags plugin. When I display the tags related to a topic then the URL on the tags appears something like this http://localhost/testapp/tags/Tags/view/{tag_key_name} I want to make this url for any action to tags plugin like this http://localhost/testapp/Tags/{action}/{tag_key_name} for (view, admin_view and admin_edit) and http://localhost/testapp/Tags/{action} for (index, admin_index and any other action that does not require an id or keyname for execution)

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• Import xml to database with high end performance and Audit log- A best Practice

  - by karthik

  Hi, I have to import big xml files to Ms SQL 2005 Database by using C# with high end Performance. Even if any record fails in middle, i have to take next record for process and failed record need to log for audit. I don't want to put insert query with in for loop. Could you please suggest a best way to do this. If I can use bulkcopy methods or Data Adapter update methods- Its very nice, But if any record fails, execution of that statement breaks and rolled back totally, right? Any alternatives and Best practices with example please..? Is Multi-threading works for me to improve performance..? Give me example please. Thanks Karthikeyan

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• How to prepare for a Java test?

  - by Zenzen

  Ok so in two days I have a test for my dream job (well it's an internship, but still!) and for quite some time now I've been reading the SCJP Guide book in order to prepare myself. BUT seeing how slow my reading speed is I guess finding a website with some "java essentials" or "standard java test questions" and going through it in those 2 days would be a better idea. Don't misunderstand me, I do have java experience and it's "only" an internship, but we all know how programming tests look like and how tricky they can be. So are there any online resources you could recommend me? I know 2 days is not much, but well I was informed bout the test 1-2days ago.

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• JavaScript multithreading

  - by Krzysztof Hasinski

  I'm working on comparison for several different methods of implementing (real or fake) multithreading in JavaScript. As far as I know only webworkers and Google Gears WorkerPool can give you real threads (ie. spread across multiple processors with real parallel execution). I've found the following methods: switch between tasks using yield() use setInterval() (or other non-blocking function) with threads waiting one for another use Google Gears WorkerPool threads (with plugin) use html5 web workers I read related questions and found several variations of the above methods, but most of those questions are old, so there might be a few new ideas. I'm wondering - how else can you achieve multithreading in JavaScript? Any other important methods? UPDATE: As pointed out in comments what I really meant was concurrency. UPDATE 2: I found information that Silverlight + JScript supports multithreading, but I'm unable to verify this. UPDATE 3: Google deprecated Gears: http://code.google.com/apis/gears/api_workerpool.html

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• How would you adblock using Python?

  - by regomodo

  I'm slowly building a web browser in PyQt4 and like the speed i'm getting out of it. However, I want to combine easylist.txt with it. I believe adblock uses this to block http requests by the browser. How would you go about it using python/PyQt4? [edit1] Ok. I think i've setup Privoxy. I haven't setup any additional filters and it seems to work. The PyQt4 i've tried to use looks like this self.proxyIP = "127.0.0.1" self.proxyPORT= 8118 proxy = QNetworkProxy() proxy.setType(QNetworkProxy.HttpProxy) proxy.setHostName(self.proxyIP) proxy.setPort(self.proxyPORT) QNetworkProxy.setApplicationProxy(proxy) However, this does absolutely nothing and I cannot make sense of the docs and can not find any examples. [edit2] I've just noticed that i'f I change self.proxyIP to my actual local IP rather than 127.0.0.1 the page doesn't load. So something is happening.

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• SQL 05 full-text query fails "Specified module could not be found."

  - by Dan Bailiff

  I'm running SQL 2005 on Windows XP. I have a database table that has full text searching enabled. I was able to build and even re-build the index. However, when I try to query it like this: Select * from fulltext_english WHERE CONTAINS(page_data, 'causes') I get this error: Msg 7619, Level 16, State 1, Line 1 The execution of a full-text query failed. "The specified module could not be found." Did I miss something on the install? Is this a dll issue? I've googled and binged for days and can't find anything similar to this message. Thanks!

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• Create date efficiently

  - by Dave Jarvis

  On Pavel's page is the following function: CREATE OR REPLACE FUNCTION makedate(year int, dayofyear int) RETURNS date AS $$ SELECT (date '0001-01-01' + ($1 - 1) * interval '1 year' + ($2 - 1) * interval '1 day'):: date $$ LANGUAGE sql; I have the following code: makedate(y.year,1) What is the fastest way in PostgreSQL to create a date for January 1st of a given year? Pavel's function would lead me to believe it is: date '0001-01-01' + y.year * interval '1 year' + interval '1 day'; My thought would be more like: to_date( y.year||'-1-1', 'YYYY-MM-DD'); Am looking for the fastest way using PostgreSQL 8.4. (The query that uses the date function can select between 100,000 and 1 million records, so it needs speed.) Thank you!

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• PHP website Optimization

  - by ana

  I have a high traffic website and I need make sure my site is fast enough to display my pages to everyone rapidly. I searched on Google many articles about speed and optimization and here's what I found: Cache the page Save it to the disk Caching the page in memory: This is very fast but if I need to change the content of my page I have to remove it from cache and then re-save the file on the disk. Save it to disk This is very easy to maintain but every time the page is accessed I have to read on the disk. Which method should I go with? Thanks

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• Crashing the OS X Pasteboard

  - by Ben Packard

  I have an application that reads in text by emulating CMD-C copy commands and reading the pasteboard - unfortunately this the only way to achieve what I need. Occasionally, something goes wrong in execution (not sure yet if it's related to the copy command or not) and the app crashes. Once in a while, this has a knock on effect on the system-wide pasteboard - any other application that is running will crash if I attempt a copy, cut, or paste. Is there a robust way to handle this - something I should be doing with the NSPasteboard before exiting? Any information on what might be happening is appreciated. For completeness, here are the only snippets of code that access the pasteboard: Reading from the pasteboard: NSString *pBoardText = [[NSPasteboard generalPasteboard]stringForType:NSStringPboardType]; Initially clearing the pasteboard (I run this only once, at launch): [[NSPasteboard generalPasteboard] declareTypes: [NSArray arrayWithObject:NSStringPboardType] owner: self]; [[NSPasteboard generalPasteboard] setString: @"" forType: NSStringPboardType];

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• Is it safe to lock a static variable in a non-static class?

  - by Dario Solera

  I've got a class that manages a shared resource. Now, since access to the resource depends on many parameters, this class is instantiated and disposed several times during the normal execution of the program. The shared resource does not support concurrency, so some kind of locking is needed. The first thing that came into my mind is having a static instance in the class, and acquire locks on it, like this: // This thing is static! static readonly object MyLock = new object(); // This thing is NOT static! MyResource _resource = ...; public DoSomeWork() { lock(MyLock) { _resource.Access(); } } Does that make sense, or would you use another approach?

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• CommandManager Executed Events don't fire for custom ICommands

  - by Andre Luus

  The WPF CommandManager allows you to do the following (pseudo-ish-code): <Button Name="SomeButton" Command="{Binding Path=ViewModelCommand}"/> And in the code-behind: private void InitCommandEvents() { CommandManager.AddExecutedEventHandler(this.SomeButton, SomeEventHandler); } The SomeEventHandler never gets called. To me this didn't seem like something very wrong to try and do, but if you consider what happens inside CommandManager.AddExecutedEventHandler, it makes sense why it doesn't. Add to that the fact that the documentation clearly states that the CommandManager only works with RoutedCommands. Nonetheless, this had me very frustrated for a while and led me to this question: What would you suggest is the best workaround for the fact that the CommandManager does not support custom ICommands? Especially if you want to add behavior around the execution of a command? For now, I fire the command manually in code behind from the button click event.

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• Question about spring transaction propagation

  - by Yousui

  Hi guys, I have a question about spring transaction propagation. If I use @Transactional(propagation = Propagation.REQUIRED) to annotate a method m1. When execution logic enter m1, if there is already a transaction, m1 will use that one. When after m1, what about the transaction? It ends or still open?(if I call m1 in another method, and after the invocation there is still other things to do). In summary, I want to know when exiting an annotated method, the transaction ends or still open? Great thanks.

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• Clever ways to better test GPS code using only the iPhone simulator?

  - by Patty

  I've been playing around with the iPhone SDK, using MapKit and Core Location. What are some of the tricks you can use to better test things... while still on the simulator (long before I have to try it out on my iPhone). Is there a way to use NSTimer and regularly get 'pretend' values for location, heading, speed, etc? The simulator only giving 1 location... and no movement... really limits its 'testing' usefulness.

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• How To Aggregate API Data?

  - by Mindblip

  Hi, I have a system that connects to 2 popular APIs. I need to aggregate the data from each into a unified result that can then be paginated. The scope of the project means that the system could end up supporting 10's of APIs. Each API imposes a max limit of 50 results per request. What is the best way of aggregating this data so that it is reliable i.e ordered, no duplicates etc I am using CakePHP framework on a LAMP environment, however, I think this question relates to all programming languages. My approach so far is to query the search API of each provider and then populate a MySQL table. From this the results are ordered, paginated etc. However, my concern is performance: API communication, parsing, inserting and then reading all in one execution. Am I missing something, does anyone have any other ideas? I'm sure this is a common problem with many alternative solutions. Any help would be greatly appreciated. Thanks, Paul

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• How to create an aspect on class, that is not a bean using Spring AOP?

  - by Ula Krukar

  Hello, I work on an legacy application, where Spring AOP (namely ProxyFactoryBean) is used. I need to add an aspect around a method of a certain class. This class is not a bean however. The AspecjJ pointcut expression would be like this: execution(* xyz.package.Class.method()) I created a MethodInterceptor and AspectJExpressionPointcut, but I don't know how make those two work together. EDIT: I do not have source code for this class, it is a 3rd party library. The instances of this class are not created by me, neither in source code, nor in spring configuration as beans. It is used internally by the library. Any help appreciated.

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