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Articles indexed in April 2010

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  • which linux flavour should I use to for my hosting server?

    - by rabbit
    Hi, We plan to host our website on a linux server. The site is created using java based technologies and will run on multiple instances of tomcat with apache in the front. I want to go in for a 64 bit linux OS so that I can install 64bit jvm. So my options are : Ubuntu Fedora CentOS which one (and which version) would be the most stable?

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  • Is there a Distributed SAN/Storage System out there?

    - by Joel Coel
    Like many other places, we ask our users not to save files to their local machines. Instead, we encourage that they be put on a file server so that others (with appropriate permissions) can use them and that the files are backed up properly. The result of this is that most users have large hard drives that are sitting mainly empty. It's 2010 now. Surely there is a system out there that lets you turn that empty space into a virtual SAN or document library? What I envision is a client program that is pushed out to users' PCs that coordinates with a central server. The server looks to users just like a normal file server, but instead of keeping entire file contents it merely keeps a record of where those files can be found among various user PCs. It then coordinates with the right clients to serve up file requests. The client software would be able to respond to such requests directly, as well as be smart enough to cache recent files locally. For redundancy the server could make sure files are copied to multiple PCs, perhaps allowing you to define groups in different locations so that an instance of the entire repository lives in each group to protect against a disaster in one building taking down everything else. Obviously you wouldn't point your database server here, but for simpler things I see several advantages: Files can often be transferred from a nearer machine. Disk space grows automatically as your company does. Should ultimately be cheaper, as you don't need to keep a separate set of disks I can see a few downsides as well: Occasional degradation of user pc performance, if the machine has to serve or accept a large file transfer during a busy period. Writes have to be propogated around the network several times (though I suspect this isn't really much of a problem, as reading happens in most places more than writing) Still need a way to send a complete copy of the data offsite occasionally, and this would make it very hard to do differentials Think of this like a cloud storage system that lives entirely within your corporate LAN and makes use of your existing user equipment. Our old main file server is due for retirement in about 2 years, and I'm looking into replacing it with a small SAN. I'm thinking something like this would be a better fit. As a school, we have a couple computer labs I can leave running that would be perfect for adding a little extra redundancy to the system. Unfortunately, the closest thing I can find is Dienst, and it's just a paper that dates back to 1994. Am I just using the wrong buzzwords in my searches, or does this really not exist? If not, is there a big downside that I'm missing?

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  • why is 64 bits version called AMD64 and 32 bits version called i386?

    - by ajsie
    I have never understood this. This is what i know: 64 bits OS if you want to handle more than 2GB RAM. Else, 32 bits OS. So on Ubuntu's homepage you can download either 64 bits or 32 bits. But the 64 bits is called amd64 and the 32 bits is called i386. So i have to have a AMD processor to run amd64? And intel to run i386? And if someone codes a software (lets say Apache). Does he have to code one 32 bits and one 64 bits? Do some softwares only exist for 32 and not 64 and vice versa? Thanks in advance!

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  • Where is debian storing its network settings?

    - by user13743
    I have a debian machine that is supposed to have a static ip, but insists on getting its address from the DHCP server. Here's this settings file: $> cat /etc/network/interfaces # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface allow-hotplug eth0 iface eth0 inet static address 192.168.1.99 gateway 192.168.1.1 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 Yet $> sudo /etc/init.d/networking restart Reconfiguring network interfaces...done. $> sudo ifconfig eth0 Link encap:Ethernet HWaddr 00:e0:03:09:05:2e inet addr:192.168.1.205 Bcast:255.255.255.255 Mask:255.255.255.0 ... Where is it being told to use dhcp?

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  • Print problems in GVIM

    - by remio
    I have set linebreak and wrap. The document looks great on my screen but when I print it the words are broken p.e. this is the text of my printed docume nt How can I resolve this problem? ps: I don't want to reformat the text, I would like to keep the text as it is on the screen. I would like to have also a bit more right margin space. Is this possible?

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  • How to achieve a specific fraction(say 80%) of the cpus and balanced over them

    - by swellfr
    Hi, I was wondering if it would be possible to run app not at 100% of the cpu but at a specific amount of the cpus. I see different usage of this , we can better balance concurrent application ( we may want to have balance app 50% to have fair apps/agent/... ) i was also wondering if the power consumption would not be better if the cpus doesnt run at full throttle but at some lower level( say 80% ) What are your thoughts Thx examples are welcomed :)

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  • FFMPEG based Theora Video Decoder performance??

    - by goldenmean
    Hi, I am in process of porting and optimization of the theora video decoder in the ffmpeg-0.5 package to ARM-Cortex-A8 -Neon processor @ 667 MHz. I am looking for some target estimate for frames per second the decoder library alone should achieve after full optimization (C level and Neon assembly / Intrinsics) for 720x480 Progressive content for a 2Mbps stream. I have a Real Video 9 decoder on cortex-A8 which gives around 40 fps for the same stream above.(720x480, 2Mbps) How can i extrapolate this data based on relative complexities of RV9 and Theora and get a fps estimate for theora decoder Cortex-A8? I am aware the performance depends upon the cache configuration of the h/w, etc...,but any Any pointers will help. Thanks, -AD

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  • get rid of red X in IE for non-existing images

    - by hubertg
    I have a 3rd website (Confluence) which references images which are secured by a login. If the current user is logged in the image is shown if not the image url would redirect to a login form. Example When you enter this url in the browser a redirect to the login page is done. The problem now: IE shows a the dreaded red X icon for the image even though there should be just nothing (like in Firefox). Anyone knows how to get around this?

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  • Doctrine unsigned validation error storing created_at

    - by Alex Dean
    Hi, I'm having problems with the Timestampable functionality in Doctrine 1.2.2. The error I get on trying to save() my Record is: Uncaught exception 'Doctrine_Validator_Exception' with message 'Validation failed in class XXX 1 field had validation error: * 1 validator failed on created_at (unsigned) ' in ... I've created the relevant field in the MySQL table as: created_at DATETIME NOT NULL, Then in setTableDefinition() I have: $this->hasColumn('created_at', 'timestamp', null, array( 'type' => 'timestamp', 'fixed' => false, 'unsigned' => false, 'primary' => false, 'notnull' => true, 'autoincrement' => false, )); Which is taken straight from the output of generateModelsFromDb(). And finally my setUp() looks like: public function setUp() { parent::setUp(); $this->actAs('Timestampable', array( 'created' => array( 'name' => 'created_at', 'type' => 'timestamp', 'format' => 'Y-m-d H:i:s', 'disabled' => false, 'options' => array() ), 'updated' => array( 'disabled' => true ))); } (I've tried not defining all of those fields for 'created', but I get the same problem.) I'm a bit stumped as to what I'm doing wrong - for one thing I can't see why Doctrine would be running any unsigned checks against a 'timestamp' datatype... Any help gratefully received! Alex

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  • Trying to set up nested while loops using a boolean switch

    - by thorn100
    First time posting. I'm trying to set up a while loop that will ask the user for the employee name, hours worked and hourly wage until the user enters 'DONE'. Eventually I'll modify the code to calculate the weekly pay and write it to a list, but one thing at a time. The problem is once the main while loop executes once, it just stops. Doesn't error out but just stops. I have to kill the program to get it to stop. I want it to ask the three questions again and again until the user is finished. Thoughts? Please note that this is just an exercise and not meant for any real world application. def getName(): """Asks for the employee's full name""" firstName=raw_input("\nWhat is your first name? ") lastName=raw_input("\nWhat is your last name? ") fullName=firstName.title() + " " + lastName.title() return fullName def getHours(): """Asks for the number of hours the employee worked""" hoursWorked=0 while int(hoursWorked)<1 or int(hoursWorked) > 60: hoursWorked=raw_input("\nHow many hours did the employee work: ") if int(hoursWorked)<1 or int(hoursWorked) > 60: print "Please enter an integer between 1 and 60." else: return hoursWorked def getWage(): """Asks for the employee's hourly wage""" wage=0 while float(wage)<6.00 or float(wage)>20.00: wage=raw_input("\nWhat is the employee's hourly wage: ") if float(wage)<6.00 or float(wage)>20.00: print ("Please enter an hourly wage between $6.00 and $20.00") else: return wage ##sentry variables employeeName="" employeeHours=0 employeeWage=0 booleanDone=False #Enter employee info print "Please enter payroll information for an employee or enter 'DONE' to quit." while booleanDone==False: while employeeName=="": employeeName=getName() if employeeName.lower()=="done": booleanDone=True break print "The employee's name is", employeeName while employeeHours==0: employeeHours=getHours() if employeeHours.lower()=="done": booleanDone=True break print employeeName, "worked", employeeHours, "this week." while employeeWage==0: employeeWage=getWage() if employeeWage.lower()=="done": booleanDone=True break print employeeName + "'s hourly wage is $" + employeeWage

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  • C# Int and math not returning full value.

    - by Mike
    Int64 c1 = Convert.ToInt64(csvdeep[1]); Int64 division = 1024; string results = Math.Abs(c1 / division / division / division).ToString(); My c1 is 10201841664 and results is "9". I'd perfer to get the 2nd two decimal places so my real result would be 9.50. Any tips on how I could get the 2 decimal places?

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  • How to have NHibernate persist a String.Empty property value as NULL

    - by Todd
    I have a fairly simple class that I want to save to SQL Server via NHibernate (w/ Fluent mappings). The class is made up mostly of optional string fields. My problem is I default the class fields to string.empty to avoid NullRefExceptions and when NHibernate saves the row to the database each column contains an empty string instead of null. Question: Is there a way for me to get NHibernate to automatically save null when the string property is an empty string? Or do I need to litter my code with if (string.empty) checks?

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  • jquery dialog button

    - by Nishima
    Hi All, Can anyone tell em how can call a function with parameters on a dialog and call that same function from somwhere else also. function showEditDialog(TagDivId, id, type, bFlag) { try { stickyinfo = new Array(); jQuery('#'+TagDivId).dialog({ autoOpen: false, height : 535, width:320, modal: true, resizable:false, //closeOnEscape:false, buttons: { Cancel: function() { jQuery(this).dialog('close'); }, 'OK': function showEditDialogOkFunc(id) { //stickyinfo.clear(); //Register Collaboba Tag with the Server. var color = jQuery('#' + id).css('background-color'); var tagid = document.getElementById(id); if(tagid != null) { GetTagInformation(id, stickyinfo); } else { return false; } } } catch(e) { alert(e); } } Is it ok the way i m calling showEditDialogOkFunc(id) and can i call this function from anywhere else.Since it's a dialog function will it get all the properies of the dialog defined above the ok function.And if i call the OK function from anuwhere else will it get all the properties of the dialog o not. Thanks

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  • Cannot save Adobe Illustrations as .pdf files

    - by Parastar
    Hi, I use adobe Illustrator creative suite 3. Now there seems to be a problem. I can't save my Illustrations In the .pdf format, since this format seems to preserve the graphic quality this Is vitally Important to me. If I save the Graphic In .jpef /.gif or png there Is some serious loss of quality so I need to find out a way to get this sorted. when I try to save the graphic as pdf It says "An unknown error has occured" please can anyone help me out here? Thank you,

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  • OracleClient to devart dotConnect for Oracle

    - by lex9081
    Has anyone tried migration from Microsoft OracleClient to dotConnect for Oracle? Is it realy so easy (as they wrote at their blog http://www.devart.com/blogs/dotconnect/?p=67) or just another marketing trick? I've tried ODP.NET, but it seems to me that its interface differs from the standard one.

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  • jquery-infinite-carousel - jump 3 items instead of one

    - by Rob B
    Successfully used jquery-infinite-carousel in the past but for my current project I need it to loop forever AND also jump 3 items at a time. Example of how it works jumping 1 at a time here. jQuery.fn.carousel = function(previous, next, options){ var sliderList = jQuery(this).children()[0]; if (sliderList) { var increment = jQuery(sliderList).children().outerWidth("true"), elmnts = jQuery(sliderList).children(), numElmts = elmnts.length, sizeFirstElmnt = increment, shownInViewport = Math.round(jQuery(this).width() / sizeFirstElmnt), firstElementOnViewPort = 1, isAnimating = false; //console.log("increment = " + increment); //console.log("numElmts = " + numElmts); //console.log("shownInViewport = " + shownInViewport); for (i = 0; i < shownInViewport; i++) { jQuery(sliderList).css('width',(numElmts+shownInViewport)*increment + increment + "px"); jQuery(sliderList).append(jQuery(elmnts[i]).clone()); } jQuery(previous).click(function(event){ if (!isAnimating) { if (firstElementOnViewPort == 1) { jQuery(sliderList).css('left', "-" + numElmts * sizeFirstElmnt + "px"); firstElementOnViewPort = numElmts; console.log("firstElementOnViewPort = " + firstElementOnViewPort); } else { firstElementOnViewPort--; } jQuery(sliderList).animate({ left: "+=" + increment, y: 0, queue: true }, "swing", function(){isAnimating = false;}); isAnimating = true; } }); jQuery(next).click(function(event){ if (!isAnimating) { if (firstElementOnViewPort > numElmts) { firstElementOnViewPort = 2; jQuery(sliderList).css('left', "0px"); } else { firstElementOnViewPort++; } jQuery(sliderList).animate({ left: "-=" + (increment), y: 0, queue: true }, "swing", function(){isAnimating = false;}); isAnimating = true; } }); } };

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  • Javascript Instance Variable Syntax (AJAX page refresh)

    - by Rosarch
    I'm having difficulty with Javascript instance variables. I'm trying to make an easy way to refresh the chat page, looking for new messages. The AJAX call supplies a mid, or the lowest message id to be returned. This allows the call to only ask for the most recent messages, instead of all of them. MessageRefresher.prototype._latest_mid; function MessageRefresher(latest_mid) { this._latest_mid = latest_mid; // it thinks `this` refers to the MessageRefresher object } MessageRefresher.prototype.refresh = function () { refreshMessages(this._latest_mid); // it thinks `this` refers to the window this._latest_mid++; } function refreshMessages(latest_mid) { $.getJSON('API/read_messages', { room_id: $.getUrlVar('key'), mid: latest_mid }, function (messages) { for (var i = 0; i < messages[0].length; i++) { var newChild = sprintf("<li>%s: %s</li>", messages[1][i], messages[0][i]); $("#messages").append(newChild); } }); var messageRefresher = new MessageRefresher(0); setInterval(messageRefresher.refresh, 1000); This results in all the messages being printed out, over and over again. I know it has other bugs, but the main issue I'm trying to work out right now is the use of the instance variable. Or is there another way I should be going about doing this?

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