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Articles indexed Thursday May 20 2010

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  • In what circumstances can large pages produce a speedup ?

    - by timday
    Modern x86 CPUs have the ability to support larger page sizes than the legacy 4K (ie 2MB or 4MB), and there are OS facilities (Linux, Windows) to access this functionality. The Microsoft link above states large pages "increase the efficiency of the translation buffer, which can increase performance for frequently accessed memory". Which isn't very helpful in predicting whether large pages will improve any given situation. I'm interested in concrete, preferably quantified, examples of where moving some program logic (or a whole application) to use huge pages has resulted in some performance improvement. Anyone got any success stories ? There's one particular case I know of myself: using huge pages can dramatically reduce the time needed to fork a large process (presumably as the number of TLB records needing copying is reduced by a factor on the order of 1000). I'm interested in whether huge pages can also benefit more mundane applications though.

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  • C++ - gcc-specific warnings

    - by HardCoder1986
    Hi! Got the following warning output when using GCC 4.5.0 & MinGW. Warning: .drectve `-aligncomm:___CTOR_LIST__,2 ' unrecognized Warning: .drectve `-aligncomm:___DTOR_LIST__,2' unrecognized What does it mean? I guess it's version-specific, because GCC 4.3.4 under cygwin didn't give that warning on the same project. If anyone had the following output (just curious that's that about), please advise me what to do.

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  • Now available!: Windows Server AppFabric RC and BizTalk Server 2010 beta

    - by The Official Microsoft IIS Site
    Several weeks ago, I told you about our upcoming Application Infrastructure Virtual Launch event . Today, I am pleased to announce the availability of the Windows Server AppFabric Release Candidate (RC). To learn more, I recommend tuning into the keynote (and the many other sessions we have going on) today at the App Infrastructure Virtual Launch event! Here’s a brief overview of the announcements we’re making during the event this morning: First off, we’re officially launching Windows Server AppFabric...(read more)

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  • Very large database, very small portion most being retrieved in real time

    - by mingyeow
    Hi folks, I have an interesting database problem. I have a DB that is 150GB in size. My memory buffer is 8GB. Most of my data is rarely being retrieved, or mainly being retrieved by backend processes. I would very much prefer to keep them around because some features require them. Some of it (namely some tables, and some identifiable parts of certain tables) are used very often in a user facing manner How can I make sure that the latter is always being kept in memory? (there is more than enough space for these) More info: We are on Ruby on rails. The database is MYSQL, our tables are stored using INNODB. We are sharding the data across 2 partitions. Because we are sharding it, we store most of our data using JSON blobs, while indexing only the primary keys

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  • BIND split-view DNS config problem

    - by organicveggie
    We have two DNS servers: one external server controlled by our ISP and one internal server controlled by us. I'd like internal requests for foo.example.com to map to 192.168.100.5 and external requests continue to map to 1.2.3.4, so I'm trying to configure a view in bind. Unfortunately, bind fails when I attempt to reload the configuration. I'm sure I'm missing something simple, but I can't figure out what it is. options { directory "/var/cache/bind"; forwarders { 8.8.8.8; 8.8.4.4; }; auth-nxdomain no; # conform to RFC1035 listen-on-v6 { any; }; }; zone "." { type hint; file "/etc/bind/db.root"; }; zone "localhost" { type master; file "/etc/bind/db.local"; }; zone "127.in-addr.arpa" { type master; file "/etc/bind/db.127"; }; zone "0.in-addr.arpa" { type master; file "/etc/bind/db.0"; }; zone "255.in-addr.arpa" { type master; file "/etc/bind/db.255"; }; view "internal" { zone "example.com" { type master; notify no; file "/etc/bind/db.example.com"; }; }; zone "example.corp" { type master; file "/etc/bind/db.example.corp"; }; zone "100.168.192.in-addr.arpa" { type master; notify no; file "/etc/bind/db.192"; }; I have excluded the entries in the view for allow-recursion and recursion in an attempt to simplify the configuration. If I remove the view and just load the example.com zone directly, it works fine. Any advice on what I might be missing?

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  • How do I set up dual monitors on Kubuntu 10.04 using the latest nVidia drivers with a 9800M video ca

    - by NoCatharsis
    I'm a Linux newb so please try to keep the lingo low-key. I installed the latest nVidia drivers on my laptop using the 9800M card. The laptop is a Gateway P-7805u and I'm connected to the second monitor using VGA. Also, before installing the nVidia drivers (and just using the basic drivers included with Kubuntu 10.04), basic dual monitor support worked, except I could not enable compositing features for some reason. So I thought the proprietary drivers would fix this. Several issues have arisen since installation: 1) I've clicked through all of the display settings to activate the second screen with absolutely no change. 2) When I try to apply settings and Save Configuration as the nVidia help suggests, I am told that I cannot save to the X.conf file. I assume this is due to innate permissions on my user settings, which I have no idea how to properly configure. 3) I have no idea where to go from here, as most of the fixes I found online involve Linux syntax and verbiage, to which I'm totally clueless after spending over half my life with Windows.

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  • How to detect device type from device connected to router?

    - by molly
    I have a att router and there is an unknown device connected to my network. I can't seem to kick it off because of how att's router settings are created which is kind of dumb. I am able to see its local ip and mac address. I am on a mac with snow leopard. How can I get more information on the device with the information that I have? I want to see what kind of device it is, I have checked all devices that are connected to the router and none seem to match the local ip that is connected. I have WPA encryption setup with a strong password.

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  • Problems with i18n using django translation on App-Engine with Korean and Hindi

    - by Greg
    I've got a setup based on the post here, and it works perfectly. Adding more languages to the mix, it recognises them fine, except for Korean (ko) and Hindi (hi). Chinese/Japanese/Hebrew are all fine, so nothing to do with encodings/charsets I don't think. Taking a look into the django code inside the app-engine SDK, I notice that all the languages that I'm using except for ko and hi are ones that ship with django - in the default settings.py and inside the locale folder they are missing. If I copy one of the locale folders inside the /usr/local/google_appengine/lib/django[...]/conf/locale and rename it to be 'ko', then it starts working in my app, but I won't be able to replicate this modification when I deploy to app-engine, so need a bit of help understanding what I might be doing wrong. my settings.py is definitely being taken into account, as if I remove languages from there then they stop working (as they should). If I copied the django modules into my app, under 'lib' there say, could I use those instead of the ones app-engine tries to use, maybe? I'm brand new to python/django/app-engine, and developing on a Mac with Leopard, if that makes any difference. I have the latest app-engine SDK as of tuesday.

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  • What's the most efficient way to format the following string?

    - by Ian P
    I have a very simple question, and I shouldn't be hung up on this, but I am. Haha! I have a string that I receive in the following format(s): 123 123456-753 123455-43 234234-4 123415 The desired output, post formatting, is: 123-455-444 123-455-55 123-455-5 or 123-455 The format is ultimately dependent upon the total number of characters in the original string.. I have several ideas of how to do this, but I keep thing there's a better way than string.Replace and concatenate... Thanks for the suggestions.. Ian

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  • Should Marketing departments have basic HTML skills?

    - by Phil.Wheeler
    Working within an organisation as part of the in-house site development team, a lot of my team's throughput is driven by the colouring-in (marketing) department. It is their responsibility to provide approved content and imagery for the features or enhancements that we include on each iteration of the company site. One thing I've noticed in this job and several previous ones is that the Marketing department is extremely particular about wording and presentation, but has little to no understanding of the actual medium with which they're working - the web. I find that my team is constantly making best guesses for various HTML attributes like image alt text, titles, rel tags, blockquote cite attributes and the like. How reasonable is it to expect that marketing departments have a strong understanding of the purpose of HTML metadata? Should it be the developer's job to remind and inform each time or are marketing departments falling behind the technology they're working with? What could I reasonably expect our marketing department to understand and provide every time with each new work request?

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  • Can obfuscation (proguard) lead to MIDlet malfunction?

    - by eMgz
    Hi, Im trying to obfuscate a Java MIDlet with proguard. It runs ok on the PC, however, when I run it on the phone, the program opens, connects to the server, and then freezes. If I disable obfuscation, it runs ok again on the phone. Ive tryed all the obfuscation levels for apps (7, 8 and 9 at NetBeans), and none of them seems to work properly, and I cant release this app for comercial use without obfuscation. Also, the compiler throws some warnings: Note: duplicate definition of library class [java.io.ByteArrayOutputStream] Note: there were 14 duplicate class definitions. But I dont know if this is realy the problem. Does anyone knows what is wrong? The obfuscator arguments are listed below: Obfuscator Arguments (7): -dontusemixedcaseclassnames -default package '' -keep public class ** { public *; } Obfuscator Arguments (8): same as (7) plus -overloadaggressively. Obfuscator Arguments (9): same as (8) but -keep public class ** extends javax.microedition.midlet.MIDlet { public *; } instead. Thanks.

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  • ref and out parameters in C# and cannot be marked as variant.

    - by Water Cooler v2
    What does the statement mean? From here ref and out parameters in C# and cannot be marked as variant. 1) Does it mean that the following can not be done. public class SomeClass<R, A>: IVariant<R, A> { public virtual R DoSomething( ref A args ) { return null; } } 2) Or does it mean I cannot have the following. public delegate R Reader<out R, in A>(A arg, string s); public static void AssignReadFromPeonMethodToDelegate(ref Reader<object, Peon> pReader) { pReader = ReadFromPeon; } static object ReadFromPeon(Peon p, string propertyName) { return p.GetType().GetField(propertyName).GetValue(p); } static Reader<object, Peon> pReader; static void Main(string[] args) { AssignReadFromPeonMethodToDelegate(ref pReader); bCanReadWrite = (bool)pReader(peon, "CanReadWrite"); Console.WriteLine("Press any key to quit..."); Console.ReadKey(); } I tried (2) and it worked.

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  • Clear Input onFocus with Google Custom Search

    - by Wes
    I'm moving a sites search over to google custom search. The old input for text looks like this: <input type="text" value="Search this website..." name="s" id="searchbox" onfocus="if (this.value == 'Search this website...') {this.value = '';}" onblur="if (this.value == '') {this.value = 'Search this website...';}" /> Now I need to Have the attr 'name' as 'q', like so: <input type="text" value="Search this website..." name="q" id="searchbox" onfocus="if (this.value == 'Search this website...') {this.value = '';}" onblur="if (this.value == '') {this.value = 'Search this website...';}" /> The odd thing is that when I swap the name over to q, I'm unable to clear the search box on focus. Am I missing something super easy?

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  • Recommendations for a 3rd party Calendar picker class that's easy to use in iPhone/iPad apps

    - by BeachRunnerJoe
    Hello. I'd like to add a Calendar picker control to my iPad app that is similar in appearence and functionality to the Calendar picker control in the upper right corner of the native Calendar app on the iPad. I've looked into a couple of the 3rd party frameworks that have Calendar controls like this (such as the Tapku Library), but because I'm new to iPhone OS development, I'm having a hard time figuring out how to use them, mostly because the ones I've looked at have little or no documentation. For those that have used 3rd party Calendar picker controls, can you recommend one that is... Easy to use or provide decent enough documentation to figure out how to use it Legit for use in iPhone OS 3.2+ (including 4.0) Or if you could recommend one and provide some code snippets from your projects that show how to... Initialize and display it Retrieve the date selected by the user I would most greatly appreciate it and I'm sure there are many others that would as well (and would be happy to vote up your response)! Thank you very much in advance, I'm going to continue researching this question right now!

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  • Efficient batch SQL query execution on Android, for upgrade database.

    - by Pentium10
    As we Android developers know, the SQLiteDatabase execSQL method can execute only one statement. The doc says: Execute a single SQL statement that is not a query. For example, CREATE TABLE, DELETE, INSERT, etc. Multiple statements separated by ;s are not supported. I have to load in a batch of records, 1000 and counting. How do I insert these efficiently? And what's the easiest way to deliver these SQLs with your apk? I mention, there is already a system database and I will run this on the onUpdate event. I have this code so far: List<String[]> li = new ArrayList<String[]>(); li.add(new String[] { "-1", "Stop", "0" }); li.add(new String[] { "0", "Start", "0" }); /* the rest of the assign */ try { for (String[] elem : li) { getDb().execSQL( "INSERT INTO " + TABLENAME + " (" + _ID + "," + NAME + "," + PARSE_ORDER + ") VALUES (?,?,?)", elem); } } catch (Exception e) { e.printStackTrace(); }

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  • Edit strings vars in compiled exe? C++ win32

    - by extintor
    I want to have a few strings in my c++ app and I want to be able to edit them later in the deployed applications (the compiled exe), Is there a way to make the exe edit itself or it resources so I can update the strings value? The app checks for updates on start, so I'm thinking about using that to algo send the command when I need to edit the strings (for example the string that contains the url used to check for updates). I don't want to use anything external to the exe, I could simply use the registry but I prefer to keep everything inside the exe. I am using visual studio 2010 c++ (or any other version of ms visual c++).

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  • PHP fsockopen doesnt return anything

    - by Industrial
    Hi! I am modifying a PHP db wrapper for the redis database. Here's how my function looks: public function connect() { $sock = @fsockopen('localhost', '6379', $errno, $errstr, 2); if ($sock === FALSE) { return FALSE; } else { stream_set_timeout($sock, 2); return $sock; } } What I want to do is to call this function from another part in my wrapper: if ($this->connect() !== FALSE) { // Do stuff } How can I get my connect function to send a FALSE when the fsockopen isn't working? Thanks!

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  • Outlook 2003 Addons

    - by Mohit Nanda
    I want to create a custom Addon/plugin for Outlook 2003, to support integrated functionality with a task management system. I am unable to find many good development resources for the same. Can someone please explain Outlook 2003 architecure and development of a plugin. Good links/resources are also welcome.

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  • What are the advantages of a rebase over a merge in git?

    - by eSKay
    In this article, the author explains rebasing with this diagram: Rebase: If you have not yet published your branch, or have clearly communicated that others should not base their work on it, you have an alternative. You can rebase your branch, where instead of merging, your commit is replaced by another commit with a different parent, and your branch is moved there. while a normal merge would have looked like this: So, if you rebase, you are just losing a history state (which would be garbage collected sometime in the future). So, why would someone want to do a rebase at all? What am I missing here?

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  • Why doesn't JQuery hover animate work in this example

    - by Christian
    When I hover over the box it doesn't change it's caller as I intent. What's wrong? <html> <head><title>test</title></head> <style type="text/css" > .box_type1{ width:560px; height:560px; background-color:#b0c4de; } </style> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script> <script type="text/javascript"> $(document).ready(function(){ $('.box_type1').hover( function () { $(this).stop().animate({backgroundColor:'#4E1402'}, 300); }, function () { $(this).stop().animate({backgroundColor:'#943D20'}, 100); }); }); </script> <body> </div> <div class="box_type1"> </div> </body> </html>

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