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  • Network latency and speed of light

    - by James
    This was kinda of covered by the following Is minimum latency fixed by the speed of light? , but i would like to add the follow up a bit. The scenario is as follows; we have two opposing sites one on the West Coast of the US and one in Ireland. The customer is in central Europe, and has requested a latency test. Ireland gives responses of ~65-70ms. However the West Coast guys claim to be faster with a response of 60ms. Now a quick check says that light in fiber would take about 42ms to make the trip to the States and 8.5ms to Ireland. So obviously this is a single hop and does not include routers, switches, firewalls, protocol overhead etc. Would I be right to call BS on their figures? As a final note I tested a ping to Google IP address that was allegedly on the west coast from a site that covered a similar distance and was amazed to get a response time of 20ms. Suggesting ICMP packets that travel twice the speed of light. So A) what am I missing B) Am I right to suspect shenanigans? UPDATE: Guys thanks so far for your help and I have been reading various previous questions on this. About 5 years I had an issue where the hop from the UK to Ireland added 10ms of latency no matter what we did. In the end I moved the servers; So imagine my surprise when I have guys that claim they are 5ms faster with a transatlantic trip. So again should I call BS? Oh and assume both sites are normal mortals that don't have access to Google magical routing, warp dives or flux capacitors. :)

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  • Having an issue trying to get Gigabit speed across my network (Ubuntu Server)

    - by user94217
    I've just started looking into the network speeds at my office, the entire network is setup to be "Gigabit". This includes Gb switches, Gb Network cards and Cat 5e cabling. I'm not expecting the full speed, I just want more than ~90 Mb/s. I've been running some tests with iperf the linux tools and checking the hardware with ethtool. I have 3 servers and when doing my checks/test I discovered that the two backup servers can access each other at around 450 Mb/s but when using either one of them to connect and test the main server, I only get the 90Mb/s even though ethtool shows the networking card running at 1000/Full. The only difference between all the server/networking cards is the "Port" which ethtool shows. On the two backup servers the "Port" is shown as MII yet on the other it's shown as "Twisted Pair". When using ethtool -s to manually set the "Port" to MII on the main server, it looses all connectivity and does not show "Speed" or "Duplex". Anyway, Am i doing something wrong? Is there a specific reason my main server cannot use Gb when there appears to be no difference except the "Port"?

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  • Why is my connection slow?

    - by Jay R.
    I have a Dell Precision T5400 with a Broadcom 1Gb onboard NIC. For some strange reason, when I access machines on our local network, the best I can get is around 125KB/s download speed. My laptop that has a 10/100Mb NIC onboard usually gets around 300KB/s or better from the same network resource. Both machines are plugged into the same 1Gb switch which connects to our local network wall jack at 100Mb half duplex. There is also a printer plugged into the same switch at 100Mb full. The resource I'm using for the test is a 30MB zip file copied from a jetty webserver that is running as part of a cruisecontrol installation. The cruisecontrol installation is running WindowsXP with full real-time antivirus and Altiris patch management and inventory running. That stuff on its own is eating some of the download speed. I've seen the laptop reach into the multiple MB/s download speed before, but the desktop never seems to get past 125KB/s to 130KB/s. In WindowsXP, before I upgraded the driver in the desktop, it was that slow. In Fedora, it is still slow even though it appears to be using the same driver version as the upgraded Windows driver. The upgraded Windows driver is faster, but still not nearly as fast as the laptop. What gives? Any insight to improve the situation would be appreciated. Could it be that the BroadCom board just isn't that good, or the driver in linux is just not as good as the Windows one?

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  • Over gigabit connection, Teracopy does 31MB/s, but Windows 8 does it at ~109MB per second?

    - by Gaurang
    I got my brain-melting first taste of Gigabit networking today, between my 2011 MacMini and Windows 8 Pro desktop connected via Cat.5e to Linksys WRT320N(sporting dd-WRT). After making sure that the line speed on both systems showed 1Gbps, I proceeded to copying a 2.4GB MP4 from the Mini to the Win 8 desktop (SMB sharing). Although satisfied with the 30-34 MB/s that Teracopy was showing (that was a proper step-up for me from 10 MB/s), I still was curious about this massive difference in the advertised and real-world speed. 2 hours of Google had me believing that there were other factors that resulted in less speed, SMB being one. So just for the sake of doing it, I iPerf'd both the systems and guess what that showed - around 875mbps on both systems! I then stumbled upon this little piece of info after which I turned off Teracopy and copied the same file through Windows 8's regular copier. 109 MB/s. Molten brains :) What exactly is causing this? And can I enable such speeds via Teracopy? I really dig the extra features that Teracopy has, will surely miss them now :D

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  • The 35 Best Tips and Tricks for Maintaining Your Windows PC

    - by Lori Kaufman
    When working (or playing) on your computer, you probably don’t think much about how you are going to clean up your files, backup your data, keep your system virus free, etc. However, these are tasks that need attention. We’ve published useful article about different aspects of maintaining your computer. Below is a list our most useful articles about maintaining your computer, operating system, software, and data. HTG Explains: Learn How Websites Are Tracking You Online Here’s How to Download Windows 8 Release Preview Right Now HTG Explains: Why Linux Doesn’t Need Defragmenting

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  • How to See What Web Sites Your Computer is Secretly Connecting To

    - by Lori Kaufman
    Has your internet connection become slower than it should be? There may be a chance that you have some malware, spyware, or adware that is using your internet connection in the background without your knowledge. Here’s how to see what’s going on under the hood. Secret Squirrel by akumath HTG Explains: When Do You Need to Update Your Drivers? How to Make the Kindle Fire Silk Browser *Actually* Fast! Amazon’s New Kindle Fire Tablet: the How-To Geek Review

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  • Examples of MMOs with small dev teams

    - by Aliud Alius
    I'd like to see a list of MMOs with small development teams in order to better understand where small teams have found a place for themselves. While examples of MMORPGs are of interest, so are games focusing on socializing, trade and commerce, city or empire building, crafting, exploration, strategy and so on. Any shipping game supporting between, say 800 and 10,000 simultaneous players belongs on this list. Thanks.

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  • Critique of SEO of this HTML

    - by Tom Gullen
    I'm designing a new site which I want to be as SEO friendly as possible, fast and responsive, semantic and very accessible. A lot of these things, embarrassingly are quite new to me. Have I miss applied anything? I want the template to be perfect. Live demo: http://69.24.73.172/demos/newDemo/ HTML: <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <title>Welcome to Scirra.com</title> <meta name="description" content="Construct 2, the HTML5 games creator." /> <meta name="keywords" content="game maker, game builder, html5, create games, games creator" /> <link rel="stylesheet" href="css/default.css" type="text/css" /> <link rel="stylesheet" href="plugins/coin-slider/coin-slider-styles.css" type="text/css" /> </head> <body> <div class="topBar"></div> <div class="mainBox"> <header> <div class="headWrapper"> <div class="s searchWrap"> <input type="text" name="SearchBox" id="SearchBox" tabindex="1" /> <div class="s searchIco"></div> </div> <!-- Logo placeholder --> </div> <div class="menuWrapper"><nav> <ul class="mainMenu"> <li><a href="#">Home</a></li> <li><a href="#">Forum</a></li> <li><a href="#" class="mainSelected">Construct</a></li> <li><a href="#">Arcade</a></li> <li><a href="#">Manual</a></li> </ul> <ul class="underMenu"> <li><a href="#">Homepage</a></li> <li><a href="#" class="underSelected">Construct</a></li> <li><a href="#">Products</a></li> <li><a href="#">Community Forum</a></li> <li><a href="#">Contact Us</a></li> </ul> </nav></div> </header> <div class="contentWrapper"> <div class="wideCol"> <div id="coin-slider" class="slideShowWrapper"> <a href="#" target="_blank"> <img src="images/screenshot1.jpg" alt="Screenshot" /> <span> Scirra software allows you to bring your imagination to life </span> </a> <a href="#"> <img src="images/screenshot2.jpg" alt="Screenshot" /> <span> Export your creations to HTML5 pages </span> </a> <a href="#"> <img src="images/screenshot3.jpg" alt="Screenshot" /> <span> Another description of some image </span> </a> <a href="#"> <img src="images/screenshot4.jpg" alt="Screenshot" /> <span> Something motivational to tell people </span> </a> </div> <div class="newsWrapper"> <h2>Latest from Twitter</h2> <div id="twitterFeed"> <p>The news on the block is this. Something has happened some news or something. <span class="smallDate">About 6 hours ago</span></p> <p>Another thing has happened lets tell the world some news or something. Lots to think about. Lots to do.<span class="smallDate">About 6 hours ago</span></p> <p>Shocker! Santa Claus is not real. This is breaking news, we must spread it. <span class="smallDate">About 6 hours ago</span></p> </div> </div> </div> <div class="thinCol"> <h1>Main Heading</h1> <p>Some paragraph goes here. It tells you about the picture. Cool! Have you thought about downloading Construct 2? Well you can download it with the link below. This column will expand vertically.</p> <h3>Help Me!</h3> <p>This column will keep expanging and expanging. It pads stuff out to make other things look good imo.</p> <h3>Why Download?</h3> <p>As well as other features, we also have some other features. Check out our <a href="#">other features</a>. Each of our other features is really cool and there to help everyone suceed.</p> <a href="#" class="s downloadBox" title="Download Construct 2 Now"> <div class="downloadHead">Download</div> <div class="downloadSize">24.5 MB</div> </a> </div> <div class="clear"></div> <h2>This Weeks Spotlight</h2> <div class="halfColWrapper"> <img src="images/spotlight1.png" class="spotLightImg" alt="Spotlight User" /> <p>Our spotlight member this week is Pooh-Bah. He writes good stuff. Read it. <a class="moreInfoLink" href="#">Learn More</a></p> </div> <div class="halfColWrapper r"> <img src="images/spotlight2.png" class="spotLightImg" alt="Spotlight Game" /> <p>Killer Bears is a scary ass game from JimmyJones. How many bears can you escape from? <a class="moreInfoLink" href="#">Learn More</a></p> </div> <div class="clear"></div> </div> </div><div class="mainEnder"></div> <footer> <div class="footerWrapper"> <div class="footerBox"> <div class="footerItem"> <h4>Community</h4> <ul> <li><a href="#">The Blog</a></li> <li><a href="#">Community Forum</a></li> <li><a href="#">RSS Feed</a></li> <li> <a class="s footIco facebook" href="http://www.facebook.com/ScirraOfficial" target="_blank" title="Visit Scirra on Facebook"></a> <a class="s footIco twitter" href="http://twitter.com/Scirra" target="_blank" title="Follow Scirra on Twitter"></a> <a class="s footIco youtube" href="http://www.youtube.com/user/ScirraVideos" target="_blank" title="Visit Scirra on Youtube"></a> </li> </ul> </div> <div class="footerItem"> <h4>About Us</h4> <ul> <li><a href="#">Contact Information</a></li> <li><a href="#">Advertising</a></li> <li><a href="#">History</a></li> <li><a href="#">Privacy Policy</a></li> <li><a href="#">Terms and Conditions</a></li> </ul> </div> <div class="footerItem"> <h4>Want to Help?</h4> <p>You can contribute to the community <a href="#">in lots of ways</a>. We have a large active friendly community, and there are lots of ways to join in!</p> <a href="#" class="ralign"><strong>Learn More</strong></a> </div> <div class="clear"></div> </div> </div> <div class="copyright"> Copyright &copy; 2011 Scirra.com. All rights reserved. </div> </footer> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script> <script type="text/javascript" src="js/common.js"></script> <script type="text/javascript" src="plugins/coin-slider/coin-slider.min.js"></script> <script type="text/javascript" src="js/homepage.js"></script> </body> </html>

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  • DNS lookup when using a CDN

    - by Steven Wu
    Using a CDN can vastly improve the load time of a website. I been thinking of using it to host all my external files like CSS, JS, Images, Videos etc. However I was thinking when linking to a CDN, wouldn't the browser have to use additional DNS lookup? So wouldn't this be counter productive? Or is the benefit to host every external files on a CDN out weighs the additional cost of a DNS lookup? What are your thoughts?

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  • How is this site so fast?

    - by user8628
    how is the website http://dftba.com/ so fast? when i click a link it loads right then? what makes it work like this? how do i make it work like this on my site? some of the objects on the site are being hosted by a website called ecogeek-cdn.net? who is this company and why do they host the images of this site? i have been looking into this site some time because i want this site to be like mine site they site use Apache they site use Python (when asked the developer told me this) they site use jquery and jqueryui they site is custom built not using wordpress they site is ownedhosted by liquidweb they site gets a million users a month they site launched in january they site uses cpanel they site does not have SSH or FTP (i tried to connect but it denied me all) they does have SSH and FTP but only allowed by their addresses Please; my english is not as good as yours

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  • Godaddy one page hosting

    - by liv a
    Disclaimer: not sure this is the right place for this kind of question, sorry in advance, just point me to the right place and I'll move it. In godaddy when paying only for domain, without hosting, they state you can get one page hosting for free but that option only opens their web-builder. I want to create a nicely design landing page, where the content is static.Is there a way to make my domain point to a wordpress one page or self created html one page/ landing page?

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  • Suitable SDK to develop quick game?

    - by gRnt
    I'm currently undertaking a personal project at home that I need to turn around inside the next few months (which working full time and still learning programming makes it a tad difficult). I'm looking for suggestions on SDK's or tools (preferably free or that come with games, similar to steam tools) that I can use to develop a "game". I'm OK with coding but have no 3D development skills at all. I've very little experience with mod tools or SDK's at all but I'm hoping someone can point me in the direction of one that does the following: A decent library of prefab 3D models to build scenes. Ability to add scripting to the scene I've used Unity before and would prefer to continue to do so however I really have the worst 3D skills imaginable and can't waste time learning them. I'd be looking for pre-fab items that are both industrial and possibly more lush environments (trees etc). If it makes any difference (due to licencing and what-not) I WILL NOT be selling this game or marketing it in any way and I am a University Student if any places do educations licences. Another alternative would be to source free 3d models elsewhere but again while I'm still learning I have no idea where to look if someone could point me in the right direction I'll do the rest of the digging. Thanks

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  • Serving images from different domain

    - by Tom Gullen
    Google audit: Serve static content from a cookieless domain (15) 2.65KB of cookies were sent with the following static resources. Serve these static resources from a domain that does not set cookies: If my domain is widgets.com, should I set up a img.widgets.com that servers these resources? How beneficial is this? Edit I setup img.widgets.com to serve images from, and changed all images to this URL. But I still get that message?

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  • How can I approach creating an efficient algorithm for maximizing value with these specific constraints?

    - by sway
    I'm having trouble coming up with an approach that isn't n^2 for this problem. Here's a contrived, simplified version I've come up with: Let's say you're a company that needs 4 employees to launch in a new city, a manager, two salespeople, and a customer support rep, and you magically know how much impact every candidate will have and how much salary they require to take the job. Your table of potential employees looks something like this: Name Position Salary Impact Adam Smith Manager 60,000 11 Allison Brown Salesperson 40,000 9 Brad Stewart Manager 55,000 9 ...etc (thousands of records) What algorithmic approach can be taken to find the maximum "impact" while still filling all the positions and remaining under, say, a 200,000 budget? Thanks!

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  • Make blogger load faster

    - by Wladimir Ivanov
    all. I use blogger as a platform for electronic music blog. Because of the thematics of the blog I embed many iframes (Youtube & Soundcloud). Of course this makes the articles to load slow. Almost each article on this blog consists of some text and many iframes below. What should I do in this particular case in order to make the articles (pages) load faster. Is there any available solution or I should use some jquery like lazy load to load iframes once the scroller reaches them? Any help is greatly appreciated.

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  • PHP and performance

    - by Naif
    I always hear that PHP is for medium and small websites whereas .NET and Java for enterprise applications. My question is about PHP. Why is PHP not a good option for enterprise web applications? Is it because if the web application becomes bigger then PHP will be slower as it is an interpreted language? I know that corporate world will choose .NET or J2EE because of the integration with their products and because of back end services, etc. However, if we just have PHP for building sites and web applications then how can we use it to perform well with big sites? In short, Is there a relationship between the performance of PHP and the size of the website? What are the factors that make PHP not appropriate option for big sites?

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  • Recommended hardware for developing ios games?

    - by Matthew
    I know you have to have mac os x to use xcode and thus to develop/compile apps for the iphone. And I'm not exactly wanting to go the hackintosh way, so I'm looking at buying a used mac. What specs are recommended. If I buy a cheap mac mini that has only 1gb of ram would that be enough? (I'm not talking about using that to create the graphics/audio, I'll use my normal windows/ubuntu pc for that). I'm just talking about being able to use xcode and write applications. I'm trying to spend the least amount I can without running into problems developing the app.

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  • Can I host a high traffic website at home?

    - by eric01
    I've been searching this up on google but I can't formulate my google search with the right terms to find an accurate answer to my question. Is it possible to have a super-fast connection at home to host a high traffic website? What is the generic term for that kind of connection? What's the major drawback of hosting at home? (I have no idea of the price range but it's probably quite expensive) Do you have to be a company to have the right to own such a connection?

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  • Windows gets progressively slower over time, why doesn't Ubuntu?

    - by William
    I, and many other previous Windows users notice that the computer seems to get progressively slower over time. I bought a leapfrog crammer only to find it installed process that sat there waiting for me to plug the crammer in so it could run the software. It took up three percent of the CPU twenty-four seven, seven day a week! This is one of the main reasons I left Windows. But, Ubuntu doesn't seem to slow down over time at all. Does Ubuntu allow programs to install background programs like the leapfrog crammer did to sit there like a leech and suck away at resources? Could someone explain why Windows tends to get slower over time, and is Ubuntu vulnrable to this too? Thanks for any help, this is puzzling me.

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  • Blogger Blog Takes Ages to Load after Custom Domain Redirection

    - by abhisek
    I recently bought a custom domain for a blogger blog (technabled.com) I have for sometime now. I followed the instructions on blogger's documentation. I added A-name records and CNAME records with my DNS provider. But, now, some strange problems are cropping up. If I connect to my broadband network and then ping technabled.com, it times out. Then, if I visit the webpage, which takes almost one and half minutes to load, and then if I ping technabled.com, it shows expected result. This is not just me. I asked some of the regular readers, who reported the same issue. As a result of this, I am losing a lot of visits. What is stranger is that the subsequent visits to the blog is faster. I have checked with a few online services to test the performance. WebPageTest seems to say the same thing: http://www.webpagetest.org/result/110117_1N_7PE/ (please see the First View / Repeat View time) Also, the pagespeed score is not that bad. So I am ruling out other possibilities. I am at a loss as to what I should do to find a solution. Help is much appreciated. :)

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  • Best way to choose random element from weighted list

    - by Qqwy
    I want to create a simple game. Every so often, a power up should appear. Right now the different kinds of power ups are stored in an array. However, not every power up should appear equally often: For instance, a score multiplier should appear much more often than an extra life. What is the best/fastest way to pick an element at random from a list where some of the elements should be picked more often than others?

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  • How does having assets saved on a secondary domain(s) reduce the load time of the website?

    - by AAA
    I went for an interview yesterday where I was asked this question: "How does having assets (images/videos) stored on a secondary domain (assets.example.com) reduce the load time of example.com?" To that I answered that by having the code "call" those assets from a secondary website it reduces the traffic that is coming to the main domain and therefore only applying bandwidth to the main domain vs having to also serve bandwidth to request assets. Is that correct? Also, If i am correct, would you say it makes sense to start new websites with this in mind or do you prefer having it done after large traffic rates are achieved?

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  • "do it all" page structure and things to watch out for?

    - by Andrew Heath
    I'm still getting my feet wet in PHP (my 1st language) and I've reached the competency level where I can code one page that handles all sorts of different related requests. They generally have a structure like this: (psuedo code) <?php include 'include/functions.php'; IF authorized IF submit (add data) ELSE IF update (update data) ELSE IF list (show special data) ELSE IF tab switch (show new area) ELSE display vanilla (show default) ELSE "must be registered/logged-in" ?> <HTML> // snip <?php echo $output; ?> // snip </HTML> and it all works nicely, and quite quickly which is cool. But I'm still sorta feeling my way in the dark... and would like some input from the pros regarding this type of page design... is it a good long-term structure? (it seems easily expanded...) are there security risks particular to this design? are there corners I should avoid painting myself into? Just curious about what lies ahead, really...

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  • What is the 'page lifecycle' of an ASP.NET MVC page, compared to ASP.NET WebForms?

    - by Simon
    What is the 'page lifecycle' of an ASP.NET MVC page, compared to ASP.NET WebForms? I'm tryin to better understand this 'simple' question in order to determine whether or not existing pages I have in a (very) simple site can be easily converted from ASP.NET WebForms. Either a 'conversion' of the process below, or an alternative lifecycle would be what I'm looking for. What I'm currently doing: (yes i know that anyone capable of answering my question already knows all this -- i'm just tryin to get a comparison of the 'lifecycle' so i thought i'd start by filling in what we already all know) Rendering the page: I have a master page which contains my basic template I have content pages that give me named regions from the master page into which I put content. In an event handler for each content page I load data from the database (mostly read-only). I bind this data to ASP.NET controls representing grids, dropdowns or repeaters. This data all 'lives' inside the HTML generated. Some of it gets into ViewState (but I wont go into that too much!) I set properties or bind data to certain items like Image or TextBox controls on the page. The page gets sent to the client rendered as non-reusable HTML. I try to avoid using ViewState other than what the page needs as a minimum. Client side (not using ASP.NET AJAX): I may use JQuery and some nasty tricks to find controls on the page and perform operations on them. If the user selects from a dropdown -- a postback is generated which triggers a C# event in my codebehind. This event may go to the database, but whatever it does a completely newly generated HTML page ends up getting sent back to the client. I may use Page.Session to store key value pairs I need to reuse later So with MVC how does this 'lifecycle' change?

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