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• Does allocation speed depend on the garbage collector being used?

  - by jkff

  My app is allocating a ton of objects (1mln per second; most objects are byte arrays of size ~80-100 and strings of the same size) and I think it might be the source of its poor performance. The app's working set is only tens of megabytes. Profiling the app shows that GC time is negligibly small. However, I suspect that perhaps the allocation procedure depends on which GC is being used, and some settings might make allocation faster or perhaps make a positive influence on cache hit rate, etc. Is that so? Or is allocation performance independent on GC settings under the assumption that garbage collection itself takes little time?

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• Can you recommend wiki, forum, blog & cms plugins for an existing Rails app or should I go the route

  - by Nick Gorbikoff

  Hello. I have an existing Rails internal app, that handles inventory, invoicing, order taking, labeling, data imports/exports, etc, etc. Now I need to add blog, cms, forum and wiki functionality to it. It seems silly to try to roll out my own solutions when there are already some out there. So I was wondering if people could recommend based on their experience: Are there good plugins out there? (Which ones you had experience with?) Would you rather recommend to go the route of engines, and integrate RadiantCMS or similar apps? (please provide recommendations based on your integration experience) Or would you just bite the bullet and roll out your own? Thank you. P.S.: Right now the app is Rails 2.3, but it will get upgraded to Rail 3 in a year, when most gems/plugins that it depends on will be Rails 3 compatible.

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• How to get a site screenshot quickly using PHP?

  - by yuli chika

  I want to create a web directory site, and I need to get these site screenshots. How to get a site screenshot quickly using PHP? I tried IECAPT,webscreencapture, khtml2png, but they are all slowly. And they all get screenshot one url by one url. Is IECAPT depends on a ie browser? if it is, why it can not open many ie tags so that work at the same time? Is there anyone can recommend me a PHP screenshots software using online? according to my above requirements? Thank you.

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• fastest in objC: IsEqualToString:@"" or length > 0?

  - by Cœur

  I'd like to know which one is fastest for testing a non-empty NSString for iOS 4.0+ (iPhone 3G). Note: the strings to test will be 99% of the time from 2 to 100 chars length. if ([foo length] > 0) or if ([foo isEqualToString:@""] == NO && foo != nil) I think it depends if isEqualToString: compares the length first (and in that case first way is faster) or if isEqualToString: compares first character of strings first (and in that case second way might be faster). ps: I already know isEqualToString: is faster than isEqual: which is itself faster than compare:.

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• How can I implement a login wall for expired or inappropriate pages?

  - by Redandwhite

  I am writing a website that very explicitly requires a login wall. Visitors should be required to log in before they are allowed to view a page. The page being built depends very much on the user's "ID". I am not sure how or where to store the user's login. I am not sure whether I should use a session variable (e.g. Session["userId"]), or some other method. The problem I see with session variables is that it's difficult to time out sessions. Note: I'm using C# 3.5 with ASP.NET in Visual Studio 2008.

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• Is there a way to set the value of $? in a mock in Ruby?

  - by rleber

  I am testing some scripts that interface with system commands. Their logic depends on the return code of the system commands, i.e. the value of $?. So, as a simplified example, the script might say: def foo(command) output=`#{command}` if $?==0 'succeeded' else 'failed' end end In order to be able to test these methods properly, I would like to be able to stub out the Kernel backquote call, and set $? to an arbitrary value, to see if I get appropriate behavior from the logic in the method after the backquote call. I can't figure out a way to do this. (In case it matters, I'm testing using Test::Unit and Mocha.)

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• change available checkboxes after select[html] changed - Zend Framework

  - by Lormitto

  Hi, Could you please help me rosolve my troubling matter. I used Zend_Form to create what I needed. However as I have relations many to many i decided to present multiple choices via checkboxes. Unfortunately range of these checkboxes depends on select field available in form. I would like to change visible/availabe checkboxes depending on select option choosen. I found that it should be possible to use javascript however I've got no idea how to take advantege of it in form based on Zend_Form. Could you suggest possible solution? Thank you in advance. Kind Regards,

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• How can we protect ourselves from other third parties installing DLLs with the same names as some of

  - by Integer Poet

  Our product includes several DLLs built from open source into files with default names as delivered by the open source developers. We're careful to install the files in our own directories and we carefully manage the search path (only for our processes) to keep the loader happy. Another developer -- a towering intellect -- decided it would be easier to install their own build of some of the same open source into C:\WINDOWS under the same default DLL filenames. Consequently, when we launch a process which depends on these open source DLLs, the system searches C:\WINDOWS before our directories and finds the DLLs installed by the other developer. And they are, of course, incompatible. Ideas which have occurred to me so far: rename all our DLLs to avoid the default names, which would only make it less likely we would encounter collisions load all our DLLs by full path so the loader captures their names into RAM and doesn't search anywhere else the next time they are requested For various reasons, neither of these options is palatable at the moment. What else can we do to defend ourselves against the towering intellects of the world?

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• what is a good way to do countif in python

  - by tolomea

  I want to count how many members of an iterable meet a given condition. I'd like to do it in a way that is clear and simple and preferably reasonably optimal. My current best ideas are: sum(meets_condition(x) for x in my_list) and len([x for x in my_list if meets_condition(x)]) The first one being iterator based is presumably faster for big lists. And it's the same form as you'd use for testing any and all. However it depends on the fact that int(True) == 1, which is somewhat ugly. The second one seems easier to read to me, but it is different from the any and all forms. Does anyone have any better suggestions? is there a library function somewhere that I am missing?

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• long waiting time in linking

  - by ccanan

  Hi, here is the situation. I am using visual studio 2005. the solution contains lots of projects, 34 projects in all, and the start up projects depends on others. then in linking part, it'll wait a long time before the real linking starts. I am pretty sure it's because of too many projects depended, as when I use a solution with 10 of the 34 projects(keep other projects as headers&libs), it'll start instantly. so any one has any idea that I can reduce the waiting time? thx.

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• Spring 3, Java EE 6

  - by arg20

  I'm learning Java EE 6. I've seen how much progress it has achieved in this release of the umbrella specification. EJBs 3.1 are far easier and more lightweight than previous versions, and CDI is amazing. I'm not familiar with Spring, but I often read that it offered some neat features that the Java EE stack didn't. Yet I also read now that JEE has caught up, and can now fully compete with Spring. I know that choosing from both depends on many factors, but if we only focus on features, say the latest trends etc. Which one has the leading edge?. Can Spring 3 offer some assets The JAVA EE 6 stack can't? Also, what about Seam framework? From what I read it's like java ee 6 but with some additions?

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• How to disambiguate subdirs with the same name in the Projects list?

  - by jlstrecker

  My Qt project has 2 subdirs/subprojects with the same name. Their directories are myproject/node and myproject/compiler/test/node. The problem (or annoyance) is that, in the Projects list in Qt, both subdirs are listed as "node". So you have to open them up to figure out which is which. myproject.pro is like this: TEMPLATE = subdirs QMAKE_CLEAN = Makefile SUBDIRS += \ compiler_test_node \ node \ ... compiler_test_node.subdir = compiler/test/node node.depends = compiler_vuo_compile ... Without renaming the myproject/compiler/test/node directory, is there a way to make it show up with a different name in the Projects list?

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• sql: DELETE + INSERT vs UPDATE + INSERT

  - by user93422

  A similar question has been asked, but since it always depends, I'm asking for my specific situation separately. I have a web-site page that shows some data that comes from a database, and to generate the data from that database I have to do some fairly complex multiple joins queries. The data is being updated once a day (nightly). I would like to pre-generate the data for the said view to speed up the page access. For that I am creating a table that contains exact data I need. Question: for my situation, is it reasonable to do complete table wipe followed by insert? or should I do update,insert? SQL wise seems like DELETE + INSERT will be easier (it is single SQL expression). EDIT: RDBMS: MS SQL Server 2008 Ent

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• What do I do with a Concrete Syntax Tree?

  - by Cap

  I'm using pyPEG to create a parse tree for a simple grammar. The tree is represented using lists and tuples. Here's an example: [('command', [('directives', [('directive', [('name', 'retrieve')]), ('directive', [('name', 'commit')])]), ('filename', [('name', 'f30502')])])] My question is what do I do with it at this point? I know a lot depends on what I am trying to do, but I haven't been able to find much about consuming/using parse trees, only creating them. Does anyone have any pointers to references I might use? Thanks for your help.

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• Can I ask ANT to look into .classpath for external jars?

  - by kunjaan

  Right now I have <!-- Classpath declaration --> <path id="project.classpath"> <fileset dir="${lib.dir}"> <include name="**/*.jar" /> <include name="**/*.zip" /> </fileset> </path> <!-- Compile Java source --> <target name="compile" depends="clean"> <mkdir dir="${build.dir}" /> <javac srcdir="${src.java.dir}" destdir="${build.dir}" nowarn="on"> <classpath refid="project.classpath" /> </javac> </target> Is there someway I can tell ANT to look into the eclipse's .classpath and figure out the external jars?

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• The best approach to customize Bootstrap Less files and keep it easy to be updated to future versions

  - by user322896

  I'm wondering what the best way would be to customize the less files in Bootstrap and, at the mean time, keep it easy to be updated to future Bootstrap versions. It's straightforward to just modify the less files, but the problem is that when the next version of Bootstrap comes out, it might be painful to upgrade (because all the changes are already deeply mixed with the original sources.) Another approach would be similar to the open closed principle, that is, keeping the original less files unchanged, and adding my customized less files to overwrite the CSS rules I need. When Bootstrap gets updated, (hopefully) I can simply replace the less files and everything would work magically. However, regardless of the correctness of my assumption, the same CSS rules would be scattered in even more places and hard to manage. Also, the more we overwrite the CSS (not for compatibility or other purposes), the more bandwidth we waste. I know this highly depends on how the author of Bootstrap would handle the structure of the framework or even the naming of CSS rules, but I'd still like to hear everybody's opinions. Thanks.

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• Writing loops with i++ or ++i [duplicate]

  - by Nonesuch

  This question already has an answer here: Why use ++i instead of i++ in cases where the value is not used anywhere else in the statement? 6 answers format of for loops 31 answers I have a question about writing loops. I always begin with (int i=0; i<10; i++) But I see many experts begin with (int i=0; i<10; ++i) Is there there any real difference, or they are same? Of course, I know the difference between pre-increment and post-increment. I mean which one I should use when writing the loop? or it depends. Thanks!

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• Table changes depending on dropdown list values with servlet

  - by kawtousse

  What I want to realize is the following: In a JSP x I have a 3 dropdownlists and a button called edit when user click this button a table dynamically should be displayed. Now this table is modified correponding the values in those 3 dropdownlists. So it can be 3 cols or 4 cols or even 6 cols, it depends on the selected values. So what I tried is to use the servlet to getParameter doing the if clause construct the html and then forward the response. Have you any the suggestion of the structure that I can use in JSP? Thank you.

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• Is 'bool' a basic datatype in C++ ?

  - by Naveen

  I got this doubt while writing some code. Is 'bool' a basic datatype defined in the C++ standard or is it some sort of extension provided by the compiler ? I got this doubt because Win32 has 'BOOL' which is nothing but a typedef of long. Also what happens if I do something like this: int i = true; Is it "always" guaranteed that variable i will have value 1 or is it again depends on the compiler I am using ? Further for some Win32 APIs which accept BOOL as the parameter what happens if I pass bool variable?

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• Prevent blank links (having javascript:;) from openening in new tab/window on middle click...?

  - by jayarjo

  There is a common practice of using <a></a> tags to markup beautiful buttons, with onlick and onhover style change, etc. Which looks and behaves great, on most part. Although there turned out to be a HUGE problem, which was not very obvious on start. The problem is that these beautiful "buttons" open new windows on middle click, either blank or with the same content as current one (depends on whether one uses # or javascript:; to disable href part). Now I've got JavaScript RIA with buttons all over it, opening new windows on middle click... Lame... At first I even couldn't understand why I get sometimes those blank pages in the browser. Since it's pretty established practice to use links in such manner, maybe there is any established way to deal with described problem?

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• Actionscript: Switching back into previous function from event handler function

  - by J.Ded.

  I need to return to my original function after capturing an event (downloading something) with another function. The original function needs to return a value, which depends on the downloaded data. So, I'd like to pause original function for the time needed for the download and the eventhandler function to complete it's work, and resume it afterwards. The obvious way is to set a flag value (both the original function and the eventhandler are within the same class) and make the original function check it until the eventhandler function changes the flag. But that would be wasteful, and my AS is slow enough already:) [other parts of the application utilise some heavy graphics]. Is there another way? Like an event that gets captured "in the middle" of the function? Or some other form of flow control?

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• What is the best way to make a game timer in Actionscript 3?

  - by Nuthman

  I have built an online game system that depends on a timer that records how long it took a player to complete a challenge. It needs to be accurate to the millisecond. Their time is stored in a SQL database. The problem is that when I use the Timer class, some players are ending up getting scores in the database of less than a second. (which is impossible, as most challenges would take at least 11 seconds to complete even in a perfect situation.) What I have found is that if a player has too many browser windows open, and/or a slow computer, the flash game slows down actually affecting the timer speed itself. The timer is 'spinning' on screen so you can physically see the numbers slowing down. It is frustrating that I cannot just open a second thread or do something to allow flash to keep accurate time regardless of whatever else is going on in the program. Any ideas?

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• Best practice for avoiding locks on a heavily read table?

  - by Luiggi

  Hi, I have a big database (~4GB), with 2 large tables (~3M records) having ~180K SELECTs/hour, ~2k UPDATEs/hour and ~1k INSERTs+DELETEs/hour. What would be the best practice to guarantee no locks for the reading tasks while inserting/updating/deleting? I was thinking about using a NOLOCK hint, but there is so much discussed about this (is good, is bad, it depends) that I'm a bit lost. I must say I've tried this in a dev environment and I didn't find any problems, but I don't want to put it on production until I get some feedback... Thank you! Luiggi

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• User activity vs. System activity on the Index Usage Statistics report

  - by Zachary G Jensen

  I recently decided to crawl over the indexes on one of our most heavily used databases to see which were suboptimal. I generated the built-in Index Usage Statistics report from SSMS, and it's showing me a great deal of information that I'm unsure how to understand. I found an article at Carpe Datum about the report, but it doesn't tell me much more than I could assume from the column titles. In particular, the report differentiates between User activity and system activity, and I'm unsure what qualifies as each type of activity. I assume that any query that uses a given index increases the '# of user X' columns. But what increases the system columns? building statistics? Is there anything that depends on the user or role(s) of a user that's running the query?

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• Class member variables, methods and their state

  - by codeMonkey

  How should class member variables be used in combination with class methods? Let's say I have a class 'C' with a member variable 'someData'. I call C.getData(), which does not return a value but instead puts data in C.someData. The class that instantiated 'C' first calls C.getData and then uses the data by accessing the member variable C.someData. I call C.getData() in the class that instantiated 'C' which is a function that returns data. I myself prefer the second way. But it also depends on the situation and it's a small difference. Is it 'bad' to have class methods that depend on the classes internal state? What are the best conventions?

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