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Articles indexed Monday March 22 2010

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  • Turn off the Linux OOM killer by default?

    - by Peter Eisentraut
    The OOM killer on Linux wreaks havoc with various applications every so often, and it appears that not much is really done on the kernel development side to improve this. Would it not be better, as a best practice when setting up a new server, to reverse the default on the memory overcommitting, that is, turn it off (vm.overcommit_memory=2) unless you know you want it on for your particular use? And what would those use cases be where you know you want the overcommitting on? As a bonus, since the behavior in case of vm.overcommit_memory=2 depends on vm.overcommit_ratio and swap space, what would be a good rule of thumb for sizing the latter two so that this whole setup keeps working reasonably?

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  • VPN Router drops connections

    - by Kathleen
    We are using a Netgear VPN Firewall Router FVS318v3.. We have a DSL connection here at the office, and my users complain of the connection dropping, or locking up on their end.. Latest firmware is installed, rebooting the router doesn't help, no other internet connectivity issues reported anywhere else (ie., no other internet connection problems here, or at their end, except when connecting to the VPN..) Is there anything else I can check to pinpoint this problem? TIA!!!

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  • Top Marketer FAQ - What Are Dofollow and Nofollow Links?

    If you have been doing any research on off page SEO or backlinks you have likely heard the terms nofollow and dofollow and that you only want to get dofollow for link popularity. This can be confusing unless you understand what all the fuss is about and how to tell the difference between the two.

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  • Effective SEO Training

    Most companies are frustrated on how they can get the attention of all the internet users to see their website easily. It is also a concern to be on top of all search engines.

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  • Opt For the Expert Services of an SEO Consultant

    Targeted traffic is very essential for bringing in business to your online website. You must use the right tools and be aware of the right methods when you pursue an online venture. If you are looking for ways to increase targeted traffic to your website and increase your web presence you should resort to the services of a good SEO consultant.

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  • Keyword Research - Why Bother?

    "Every long journey, starts with a single step" says Confucius. And with every successful SEO campaign, one must start with proper keyword research. Keyword research is more than just knowing which keywords to use for a campaign, it also determines the direction of your campaign in relation to whatever key phrase you are targeting.

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  • SEO Marketing

    SEO marketing has become a hot new emerging sector on the internet today. With the many new websites being uploaded to the internet almost every minute, search engine optimization is on everyone's minds. There are a lot of available options when it comes to choosing a form of marketing SEO to meet your needs.

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  • Web service request ignores basic WSDL XML element restrictions

    - by Oliver
    Hi all, I have encountered some difficulties while trying to validate an incoming soap message to a service I have running on JBoss AS (v. 5.1.0). In my code, I have explicitly set some fields to be required, eg: public class MyClass { @XmlElement(required=true, nillable=false) private List<myOtherObjects> myList; } This requirement is also reflected in the WSDL (note the lack of minOccurs="0"): <xs:element maxOccurs="unbounded" name="myList" type="tns:myOtherObjects" /> However, when I do a test soap message that has myList set to empty or null, these restrictions are completely ignored, forcing me to validate manually within the application logic on the service. I did some searching on the Internet and found out that, on WebLogic, the validation does not seem to be enabled by default, though it can be turned on by modifying the weblogic-webservices.xml file. (http://forums.oracle.com/forums/thread.jspa?threadID=783972&tstart=115) I’m wondering if there is something similar that I have to do with JBoss AS to enable automatic validation before the soap message reaches the service. Any help would be greatly appreciated. Oliver

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  • WPF: Draw a grid on a Canvas?

    - by stefan.at.wpf
    Hello community, I'm currently trying to add gridlines to a canvas. I need an exact free space between them, where I'd like to place something for hit detection per cell, maybe simply a transparent border or such a thing. While I thought this would be an easy thing, I'm facing problems like antialiasing and that lines in WPF aren't very "calculate" / exact drawing friendly - e.g. if I draw a line on x=20 with a thickness of 10, the line's width goes from x=15 to x=25 (maybe not exactly, just some kind like that), so it takes the given position as middle point - if it would draw from 20 to 30 it would be easier in my case. Besides that making things more complex, how does WPF handle e.g. a thickness of 5? Draw thickness 3 left from the given point and the remaining 2 right from it? Or maybe just the opposite way? Well, just wanted to show you which problems I have, though this all maybe just seems simple to be done. Just wondering if anyone has ever done this before. Currently I find a Border without content and just 2 sites set to a thickness greater than 0 as line seems to work the best in my tests, seems like it's clear where they are drawn and they somehow don't seem to make any antialiasing problems. Just wondering if there's a more intuitive / better way of doing this? I don't want to lay a Canvas over a Grid, I think this maybe makes some things more complex in the end (by the way: how would I place a Canvas on top of a Grid?). Thanks for any hint!

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  • Getting duplicate key values in array

    - by WmasterJ
    For some reason when trying to populate an array I am not getting the desired result. In the first part I create an array of arrays, the key of each has a name such as "Biology Education". But when I then populate that same array it doesn't for some reason use the same array element but a new one. So part 1 results in an array with 13 array elements (empty). After part 2 has run the array has 26 array elements, with the first 13 empty and the other 13 populated as wanted. The reason why I want to work is that the first 13 array elements are sorted. The last 13 are jumbled. Why is this happening and how can I correct it? // PART 1 // Create array of research areas $research_result = db_fetch_array($research['research_query_result']); $research['areas'] = explode("\n", $research_result['options']); // Put the values as key and every key the new value of an array object $research['areas'] = array_fill_keys($research['areas'], array()); // PART 2 foreach($research['user'] as $uid => &$user_object) { $user_object->profile_research_areas = explode(", ", $user_object->profile_research_areas); foreach($user_object->profile_research_areas as $key => $area) { $research['areas'][$area][] = $uid; } }

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  • Generate markdown from source code doc-comments

    - by erikkallen
    Is there any easy way to generate markdown from source code comments? I'm looking for something similar to Sandcastle, but with Markdown (or something like it) as output. The full story is that I use DokuWiki to generate documentation. It has many nice properties, including that all its data is stored in text files. So my idea is that I should somehow be able to get my API docs into the same place as the rest of my documentation. So far my best bet seems to be to write a custom documenter for NDoc3, but perhaps someone has already done something similar which would save me the trouble. I realize I might need to tweak it a little due to slight syntax differences.

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  • Sparse matrices / arrays in Java

    - by DanM
    I'm working on a project, written in Java, which requires that I build a very large 2-D sparse array. Very sparse, if that makes a difference. Anyway: the most crucial aspect for this application is efficency in terms of time (assume loads of memory, though not nearly so unlimited as to allow me to use a standard 2-D array -- the key range is in the billions in both dimensions). Out of the kajillion cells in the array, there will be several hundred thousand cells which contain an object. I need to be able to modify cell contents VERY quickly. Anyway: Does anyone know a particularly good library for this purpose? It would have to be Berkeley, LGPL or similar license (no GPL, as the product can't be entirely open-sourced). Or if there's just a very simple way to make a homebrew sparse array object, that'd be fine too. I'm considering MTJ, but haven't heard any opinions on its quality. Thanks!! -Dan

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  • MSSQL 2008 - Bit Param Evaluation alters Execution Plan

    - by Nathanial Woolls
    I have been working on migrating some of our data from Microsoft SQL Server 2000 to 2008. Among the usual hiccups and whatnot, I’ve run across something strange. Linked below is a SQL query that returns very quickly under 2000, but takes 20 minutes under 2008. I have read quite a bit on upgrading SQL server and went down the usual paths of checking indexes, statistics, etc. before coming to the conclusion that the following statement, found in the WHERE clause, causes the execution plan for the steps that follow this statement to change dramatically: And ( @bOnlyUnmatched = 0 -- offending line Or Not Exists( The SQL statements and execution plans are linked below. A coworker was able to rewrite a portion of the WHERE clause using a CASE statement, which seems to “trick” the optimizer into using a better execution plan. The version with the CASE statement is also contained in the linked archive. I’d like to see if someone has an explanation as to why this is happening and if there may be a more elegant solution than using a CASE statement. While we can work around this specific issue, I’d like to have a broader understanding of what is happening to ensure the rest of the migration is as painless as possible. Zip file with SQL statements and XML execution plans Thanks in advance!

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  • How do I delete folders in bash after successful copy (Mac OSX)?

    - by cohortq
    Hello! I recently created my first bash script, and I am having problems perfecting it's operation. I am trying to copy certain folders from one local drive, to a network drive. I am having the problem of deleting folders once they are copied over, well and also really verifying that they were copied over). Is there a better way to try to delete folders after rsync is done copying? I was trying to exclude the live tv buffer folder, but really, I can blow it away without consequence if need be. Any help would be great! thanks! #!/bin/bash network="CBS" useracct="tvcapture" thedate=$(date "+%m%d%Y") folderToBeMoved="/users/$useracct/Documents" newfoldername="/Volumes/Media/TV/$network/$thedate" ECHO "Network is $network" ECHO "date is $thedate" ECHO "source is $folderToBeMoved" ECHO "dest is $newfoldername" mkdir $newfoldername rsync -av $folderToBeMoved/"EyeTV Archive"/*.eyetv $newfoldername --exclude="Live TV Buffer.eyetv" # this fails when there is more than one *.eyetv folder if [ -d $newfoldername/*.eyetv ]; then #this deletes the contents of the directories find $folderToBeMoved/"EyeTV Archive"/*.eyetv \( ! -path $folderToBeMoved/"EyeTV Archive"/"Live TV Buffer.eyetv" \) -delete #remove empty directory find $folderToBeMoved/"EyeTV Archive"/*.eyetv -type d -exec rmdir {} \; fi

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  • How does a syscall knows where the wrapper function put its parameters in?

    - by EpsilonVector
    I'm trying to implement a syscall in Linux (RedHat Enterprise 8) and I'm a bit confused about the way it works. From what I understand, I implement a wrapper in user mode which puts the syscall number in eax and parameters in ebx, ecx, edx, etc, and then invokes int 0x80 which calls the appropriate syscall. My question is, since a syscall is written like a regular C function, how does it know what registers contain what parameters? Is it a convention, or is there a mechanism for it, and if so where and how does it do it?

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  • Do newer versions of BJam support backwards compatibility with older versions of Boost?

    - by cmmacphe
    I'm trying to build version 1.35 of Boost with the newest version of bjam that is bundled with version 1.42 Boost. Will this adversely affect the results of the build? Is this even possible? The reason I'm trying to do this is because the newest version of BJam has support for command line options that are not included in the older version of BJam that comes bundled with 1.35 of boost.

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  • Apache not loading Xdebug, but does when started from the Command Line

    - by JamesD
    I know that this sounds odd, but believe me, it's what is happening. Here are my system settings: Windows7 Apache 2.2 PHP 5.2.12 Xdebug 2.0.5 I have XDebug configured in my PHP.ini file. When I run php -m, I do in fact see that Xdebug is loaded. Now, if I start Apache AS A SERVICE (or by the Apache Monitor), and run phpinfo(), it is NOT showing Xdebug as being loaded. However, (now here's the crazy part), if I go to my Apache bin directory, and simply run httpd.exe, and then go and look at phpinfo(), Xdebug now shows as being loaded! Also, comparing some phpinfo() when started via service or by command line, it looks like the php.ini file is the same for either case. Everything looks the same except for the Xdebug being loaded part. Please, if you have any ideas it would be greatly appreciated.

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  • How do i sign variables?

    - by acidzombie24
    I have a few variables that must be stored on the client side. As usual anything on client side can be tampered. I would like to sign a few variables and verified them when the data is sent back to the server. At the moment i think they are 5 64bit vars. On the server i would like to sign those 5 variables, then ensure the signature is valid when the client sends it back. How do i do this using C# .NET?

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