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  • Java OutOfMemoryError due to Linux RAM disk cache not freed

    - by Markus Jevring
    The process will run fine all day, then, bam, without warning, it will throw this error. Sometimes seemingly in the middle of doing nothing. It will happen at seemingly random times during the day. I checked to see if anything else was running on the machine, like scheduled backups or something, but found nothing. The machine has enough physical memory (2GB, with about 1GB free for a 3-500MB load), and has sufficient -Xmx specified. According to our sysadmin, the problem is that the RAM that the kernel uses as a disk cache (apparently all but 8MB) is not freed when the JVM needs to allocate memory, so the JVM process throws an OutOfMemoryError. This could be because Java asks the kernel if enough memory is available before allocating and finds that it is insufficient, resulting in a crash. I would like to think, however, that Java simply tries to allocate the memory via the kernel, and when the kernel gets such a request, it makes room for the application by throwing our some of the disk cache. Has anyone else run in to the issue, and if so, what was the error, and how did you solve it? We are currently using jdk1.6.0_20 on SLES 10 SP2 Linux 2.6.16.60-0.42.9-smp in VMWare ESX.

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  • Code Golf: Numeric Equivalent of an Excel Column-Name

    - by Vivin Paliath
    Can you figure out the numeric equivalent of an Excel column string in the shortest-possible way, using your favorite language? For example, the A column is 1, B is 2, so on and so forth. Once you hit Z, the next column becomes AA, then AB and so on. Rules: Here is some sample input and output: A: 1 B: 2 AD: 30 ABC: 731 WTF: 16074 ROFL: 326676 I don't know if the submitter is allowed to post a solution, but I have a Perl solution that clocks in at 125 characters :).

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  • Give back full control to a user on a disk from another computer

    - by Foghorn
    I have my friend's hard drive mounted externally. After messing with the permissions with TAKEOWN so I could fix some viruses, I have full control over their drive. The problem is, now it's stuck in a "autochk not found" reboot sequence. I think the problem is that the boot sector is invisible to the drive now. So my question is, How can I use icacls to give back the full ownership, when the user I am giving it to is not on my machine? I ran the TAKEOWN command from my windows 7 laptop, their machine is a windows xp Professional with three partitions, I only altered the one that has the boot sector. Here is the permissions that icacls shows: (Where my computer is %System% my username is ME, and the drive is E:\ C:\Users\ME icacls E:\* E:\$RECYCLE.BIN %System%\ME:(OI)(CI)(F) Mandatory Label\Low Mandatory Level:(OI)(CI)(IO)(NW) E:\ALLDATAW %System%\ME:(I)(OI)(CI)(F) E:\alrt_200.data %System%\ME:(OI)(CI)(F) E:\AUTOEXEC.BAT %System%\ME:(OI)(CI)(F) E:\AZ Commercial %System%\ME:(I)(OI)(CI)(F) E:\boot.ini %System%\ME:(OI)(CI)(F) E:\Config.Msi %System%\ME:(I)(OI)(CI)(F) E:\CONFIG.SYS %System%\ME:(OI)(CI)(F) E:\Documents and Settings %System%\ME:(I)(OI)(CI)(F) E:\IO.SYS %System%\ME:(OI)(CI)(F) E:\Mitchell1 %System%\ME:(I)(OI)(CI)(F) E:\MSDOS.SYS %System%\ME:(OI)(CI)(F) E:\MSOCache %System%\ME:(I)(OI)(CI)(F) E:\NTDClient.log %System%\ME:(OI)(CI)(F) E:\NTDETECT.COM %System%\ME:(OI)(CI)(F) E:\ntldr %System%\ME:(OI)(CI)(F) E:\pagefile.sys %System%\ME:(OI)(CI)(F) E:\Program Files %System%\ME:(I)(OI)(CI)(F) E:\RECYCLER %System%\ME:(I)(OI)(CI)(F) E:\RHDSetup.log %System%\ME:(OI)(CI)(F) E:\System Volume Information %System%\ME:(I)(OI)(CI)(F) E:\WINDOWS %System%\ME:(I)(OI)(CI)(F) Successfully processed 22 files; Failed processing 0 files C:\Users\ME

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  • Do any JS implementations currently support (or have support on the roadmap for) fast, vectorized op

    - by agnoster
    I'd like to do a bit of matrix/vector arithmetic in JavaScript, and was wondering if any browsers or other JS implementations actually have support for vectorized operations, for instance for quickly summing the entries of two Arrays (or summing, or whatever). Even if that currently doesn't mean it compiles down to vectorized operations, at least some language support would be nice for when it does get implemented - I'd take the existence of functions or syntax to support it as a step in the right direction. (Understandably, "vectorization javascript" searches are pretty much all about graphics and SVG.)

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  • Why do ASP.NET applications appear to be running in a terminal server session?

    - by Heinzi
    Running the following ASPX page (IIS 6, Server 2003 R2) <%@ Page Language="vb" AutoEventWireup="false" %> <% Response.Write("Am I running in a terminal server session: " & _ System.Windows.Forms.SystemInformation.TerminalServerSession) %> yields the following output: Am I running in a terminal server session: True Why? IIS is running as a service, not as a Terminal Services application... (BTW, according to Reflector, SystemInformation.TerminalServerSession is just a wrapper for GetSystemMetrics(SM_REMOTESESSION).)

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  • Advice on optimzing speed for a Stored Procedure that uses Views

    - by Belliez
    Based on a previous question and with a lot of help from Damir Sudarevic (thanks) I have the following sql code which works great but is very slow. Can anyone suggest how I can speed this up and optimise for speed. I am now using SQL Server Express 2008 (not 2005 as per my original question). What this code does is retrieves parameters and their associated values from several tables and rotates the table in a form that can be easily compared. Its great for one of two rows of data but now I am testing with 100 rows and to run GetJobParameters takes over 7 minutes to complete? Any advice is gratefully accepted, thank you in advanced. /*********************************************************************************************** ** CREATE A VIEW (VIRTUAL TABLE) TO ALLOW EASIER RETREIVAL OF PARMETERS ************************************************************************************************/ CREATE VIEW dbo.vParameters AS SELECT m.MachineID AS [Machine ID] ,j.JobID AS [Job ID] ,p.ParamID AS [Param ID] ,t.ParamTypeID AS [Param Type ID] ,m.Name AS [Machine Name] ,j.Name AS [Job Name] ,t.Name AS [Param Type Name] ,t.JobDataType AS [Job DataType] ,x.Value AS [Measurement Value] ,x.Unit AS [Unit] ,y.Value AS [JobDataType] FROM dbo.Machines AS m JOIN dbo.JobFiles AS j ON j.MachineID = m.MachineID JOIN dbo.JobParams AS p ON p.JobFileID = j.JobID JOIN dbo.JobParamType AS t ON t.ParamTypeID = p.ParamTypeID LEFT JOIN dbo.JobMeasurement AS x ON x.ParamID = p.ParamID LEFT JOIN dbo.JobTrait AS y ON y.ParamID = p.ParamID GO -- Step 2 CREATE VIEW dbo.vJobValues AS SELECT [Job Name] ,[Param Type Name] ,COALESCE(cast([Measurement Value] AS varchar(50)), [JobDataType]) AS [Val] FROM dbo.vParameters GO /*********************************************************************************************** ** GET JOB PARMETERS FROM THE VIEW JUST CREATED ************************************************************************************************/ CREATE PROCEDURE GetJobParameters AS -- Step 3 DECLARE @Params TABLE ( id int IDENTITY (1,1) ,ParamName varchar(50) ); INSERT INTO @Params (ParamName) SELECT DISTINCT [Name] FROM dbo.JobParamType -- Step 4 DECLARE @qw TABLE( id int IDENTITY (1,1) , txt nchar(300) ) INSERT INTO @qw (txt) SELECT 'SELECT' UNION SELECT '[Job Name]' ; INSERT INTO @qw (txt) SELECT ',MAX(CASE [Param Type Name] WHEN ''' + ParamName + ''' THEN Val ELSE NULL END) AS [' + ParamName + ']' FROM @Params ORDER BY id; INSERT INTO @qw (txt) SELECT 'FROM dbo.vJobValues' UNION SELECT 'GROUP BY [Job Name]' UNION SELECT 'ORDER BY [Job Name]'; -- Step 5 --SELECT txt FROM @qw DECLARE @sql_output VARCHAR (MAX) SET @sql_output = '' -- NULL + '' = NULL, so we need to have a seed SELECT @sql_output = -- string to avoid losing the first line. COALESCE (@sql_output + txt + char (10), '') FROM @qw EXEC (@sql_output) GO

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  • Socket programming C# vs C++

    - by klay
    Hi My company is willing to develop a server application, the application will use one port, clients will connect to this port and sending data every 3 minutes, casually the server will send some data. my questions are: how many connection can be handled when connecting to one port? which language Do we choose to write the Application (mainly between C# and C++)? (performance, ease of development) thanks

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  • Strategies for Accessing a Application with a COM API From PHP

    - by Alan Storm
    Background: Experienced PHP developer with a mostly *nix background. I'm writing a PHP application that needs to interact with a proprietary 3rd party system. The 3rd party system is Windows only. The PHP application will be living on a separate Linux based system The 3rd party application has been described as having a "COM API" that I'll need to talk to from the PHP application. What does this look like architecturally speaking? I'm starting with the COM section of the PHP manual, but I have specific questions. Specific Questions: Can I talk directly to a COM API from a PHP application running on another server? If so, how? (what PHP extensions would I need, or what protocols/PHP functions would I be using to talk to the API) If the answer to number 2 is no, I'd assume I'd need some kind of application on the Windows machine that can talk to COM, and then a service on the windows machine I can hit with PHP. Are there prebuilt frameworks for this kind of thing? Is this all nonsense and/or did I say something exceedingly stupid? (Quite possible, as I'm a little fuzzy on what "COM" does and doesn't cover) I'm obviously not looking for a full solution here, I'm just trying to get a general idea of what is and isn't possible and what kind of things I'll want to Google for. Thanks!

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  • Diamond square algorithm.

    - by Gabriel A. Zorrilla
    I'm trying to write the Diamond-Square algorithm in Java to generate a random map but can't figure out the implementation... Anyone with some Java code (or other language) so i can check how the loop is made would be greatly appreciated! Thanks!

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  • Should I learn Python2 or Python3?

    - by Elena
    Hello everyone, I was thinking in learning a new language and settled for Python. But now that Dive into Python 3 is out, which one should I learn, 2 or 3? I am asking this also considering possible jobs for version 2 or 3. So, what do you think? Thank you!

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  • bundles in java?

    - by fayer
    in symfony 2.0 and django there are bundles that contain everything for a feature (html, css, js, img, php/python). so if you want to delete one feature, you basically just delete that bundle and unregister it from "main". are there java frameworks for this too? or is it different in java cause java is a compiling language. thanks

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  • vHost RewriteRule is creating a 500 Error

    - by Andrew Ellis
    Hello, Below you will find my current vHost entry that I am using for a site that I currently have under development. This vHost entry works fine when I have it on my local machine, but when I push my code to my staging server that is running this same vHost record I receive a 500 Internal Server error. The machine I'm running this vHost on is running Apache 2.2.9 (Debian). <VirtualHost 206.217.196.61:80> SuExecUserGroup 13labs 13labs ServerAdmin [email protected] ServerName admin.13labs.net ServerAlias admin.13labs.net DirectoryIndex index.php DocumentRoot /var/www/13labs.net/html/admin/ ErrorLog /var/www/13labs.net/logs/error.log # Hide .svn Directories <DirectoryMatch "\.svn"> Order deny,allow deny from all </DirectoryMatch> # FastCGI Alias /fcgi-bin/ /var/www/13labs.net/fcgi-bin/ AddHandler php-fastcgi .php AddType application/x-httpd-php .php Action php-fastcgi /fcgi-bin/admin-php.fcgi <Directory /var/www/13labs.net/fcgi-bin/> SetHandler fcgid-script AllowOverride None Options -Indexes +ExecCGI -FollowSymlinks -SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> <Directory /var/www/13labs.net/html/admin/> AllowOverride None Options -Indexes -FollowSymlinks -SymLinksIfOwnerMatch FileETag All </Directory> # Rewrite Logic RewriteEngine On RewriteCond %{REQUEST_FILENAME} !\.(gif|jpe?g|png|js|css|swf|php|ico|txt|pdf)$ RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-l RewriteRule ^/(.+)$ /index.php/$1 [PT,QSA,L] Thanks for any help that you can provide. Best regards, Andrew

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  • User agent string of Opera Mini on iPhone

    - by nickf
    So hell froze over and Apple accepted Opera Mini into the app store. Does anyone know what the user agent string will be? The documentation says that Opera's template is like this: Opera/9.80 (J2ME/MIDP; Opera Mini/$CLIENT_VERSION/$SERVER_VERSION; U; $LANGUAGE) Presto/$PRESTO_VERSION

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  • How does Appcelerator Titanium Mobile Work?

    - by Darrell Brogdon
    I'm working on building an iPhone app with Titanium Mobile 1.0 and I see that it compiles down to a native iPhone binary. How does this work? Seems like it would take a lot of heavy lifting to analyze the JavaScript code and do a direct translation into Objective-C without having a subset language like 280 North's Objective-J and Cappuccino.

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  • Ruby Mobile Ports

    - by Nathan Campos
    I'm now learning Ruby because I saw it's a very powerfull language, but now I want to know what mobile ports of Ruby we have and for what devices. PS: I have a HTC S711, HP iPAQ Hx2, Nokia E61, Nokia N95, Palm T|X, Palm Z22, HP Jornada 720..., it's better if I can use it on these platforms, but I'm open to buy other devices, as I'm a mobile addict.

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  • php constant with gettext

    - by wesamly
    I am using config file which contains: config.php define('SYS_TITLE','My Application Title'); I load language local for gettext based on SESSION variable in another file included after the config file is loaded. something like: echo _(SYS_TITLE); What is the best way to translate the SYS_TITLE without changing much of the code.

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  • Protect .NET code from reverse engineering?

    - by Priyank Bolia
    Obfuscation is one way, but it can't protect from breaking the piracy protection security of the application. How to make sure that the application is not tampered with, and how to make sure that the registration mechanism can't be reverse engineered. Also it is possible to make to convert C# app in native code, Xenocode is too costly. C# provides lot of features, and is the ideal language for my code, so writing in C++ again the whole codebase is out of question. Secure certificates can be easily removed from the signed assemblies in .NET

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  • translate database fields with rails

    - by fursie
    hi I know about the built-in I18n in Rails, but how can I select a database field per locale? My model structure is something like this: title #default (englisch) title_de #(german) title_it #(italian) In my template I want to be able to write only <%= @model.title %> and should get the value in the right language. Is there a plugin or a solution to use different fields per different locale settings with a structure like mine?

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  • converting .doc and .xls file to html on rhel 4 server using php

    - by prateek
    i have a rhel 4 server and use php as a server side scripting language. There are many doc and excel files that are uploaded to the server daily. i make these files to be downloaded. i want to implement the view as html feature and they should preserve the formatting also. so which tools can be used or it can be done through php only. (on php4)

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  • Templates - Exercises

    - by atch
    Hi, As I mentioned in my yesterday's post, I'm trying to teach myself templates from the book: Templates: The Complete Guide. And although I'm finding this book very nicely presented and material there is explained really well there are no exercises attached after each chapter to test your knowlege, like it is in The C++ Language by B.S for example and had done all exercises from "The C++" I really feel benefit from doing them. So what I'm asking today is: Does anyone know where can I get excersises with templates. Thank you.

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