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  • How do you manage large web farms?

    - by Andrew Katz
    I have a quickly growing web farm running IIS 7 (30+ servers). All servers are identical copies of each other and all servers are physical. We update the software about once a month, and in the current process, we follow the following steps: Disable server from pool on F5 load balancer. Disable HTTP Keep-alives in IIS so connections drop quickly. Change default directory of website to new folder containing new binaries. Test server Enable HTTP Keep-alives. Enable server in F5 pool. Move to server 2 Microsoft used to have Application Center which was abandoned a while ago. They have made a second attempt with the Web Farm Framework, but this adds as much QA time testing the release package as it saves in the deployment. Has anyone seen a commercial off the shelf application that is tailored for managing and deploying to large web farms? Thanks!

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  • Nginx Static Content Server Maxing Out?

    - by Harry
    I use nginx to serve the static content for a decently busy website of mine. I have the logging disabled, and 4 worker processes enabled with 5,000 connections per worker (which should yield a max connection limit of 20,000. The server is only operating at about 10% CPU usage and 50% ram, but it's very laggy, and sometimes nginx is so slow to respond to the requests, it times out. For a small number of connections, it's fine, but once any load starts occurring (~2,500 connections), it backs up and bogs down. Is there any other bottlenecks or limits that I might be hitting? This is a FreeBSD server, and all the static files are located locally (not NFS). The NIC is an unmetered gigabit, and it's only using around 75 megabit. Any insight would be appreciated. Thanks.

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  • Personalized Pricing

    - by David Dorf
    In past postings I've spent a fair amount of time talking about targeted promotions.  Using a complete view of the customer that includes purchase history, location history, and psychographics gleaned from social media, we can select the offer with the greatest chance of redemption.  This is done to influence shopping behavior, which might be introducing the consumer to a new product line, increasing their basket size, increasing frequency of purchases, etc. Safeway seems to be taking a slightly different approach with their personalized pricing.  In additional to offering electronic coupons and club card offers, they are also providing a personalized price for certain items based on purchase history.  So when Sally want to shop at Safeway, she first checks the "Just for U" website for three types of deals.  She starts by selecting manufacturer coupons to load into her loyalty card, then she checks the Club Card for offers like "buy one get one free." The third step is the interesting one.  Safeway will set a particular lower price for Sally good for 90 days on items she buys often.  Clearly this isn't enforcing a new behavior but rather instilling loyalty.  I would love to know exactly how they are determining the personalized price.  Of course bargain hunters can still stack the three offers so they can, for example, get their $4.99 Oatmeal for $0.72. I like this particular question and answer from their website's FAQ: My offers are not that great. Can I tell you what offers I need? That's a good idea. That functionality is not currently available, but we appreciate your input and are constantly improving our just for U program. Stay tuned for exciting enhancements! I suppose if Safeway is tracking all the purchases, they can easily determine whether the customer if profitable.  As long as the customer stays profitable, why not let them determine a few offers themselves?  Food for thought.

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  • How stoper one annimation model on XNA?

    - by Mehdi Bugnard
    I met a Difficulty for one stoper annimation. Everything works great starter for the animation. But I do not see how stoper and can continue the annimation paused. The "animationPlayer.StartClip (clip)" is used to choke the annimation but impossible to find a way to stoper Thans's a lot Here is my code to use. protected override void LoadContent() { //Model - Player model_player = Content.Load<Model>("Models\\Player\\models"); // Look up our custom skinning information. SkinningData skinningData = model_player.Tag as SkinningData; if (skinningData == null) throw new InvalidOperationException ("This model does not contain a SkinningData tag."); // Create an animation player, and start decoding an animation clip. animationPlayer = new AnimationPlayer(skinningData); AnimationClip clip = skinningData.AnimationClips["ArmLowAction_006"]; animationPlayer.StartClip(clip); } protected overide update(GameTime gameTime) { KeyboardState key = Keyboard.GetState(); // If player don't move -> stop anim if (!key.IsKeyDown(Keys.W) && !keyStateOld.IsKeyUp(Keys.S) && !keyStateOld.IsKeyUp(Keys.A) && !keyStateOld.IsKeyUp(Keys.D)) { //animation stop ? not exist ? animationPlayer.Stop(); isPlayerStop = true; } else { if(isPlayerStop == true) { isPlayerStop = false; animationPlayer.StartClip(Clip); } }

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  • How to install Mac OS X Snow Leopard server on any virtual machine with DMG?

    - by Eonil
    I'm trying to install Mac OS X Snow Leopard Server on VirtualBox. I know this is duplicated question, however another questions have no fine answer. I'm trying to install on VirtualBox on iMac. So this is pretty legal. But the problem is I want to install with DMG image. Because installing DVD drive is too slow, and I have to install Mac OS X many times. And taking DVD disc from box is annoying too. But VirtualBox fails installing. It couldn't load kernel. It installs well with DVDs. Is there any way to do this? I'm considering using other VM solutions like Parallels or VMWare if they can support install from DMG images well. If you know about them certainly, please let me know.

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  • Using 12.04 installation as a persistent pen drive

    - by Cawas
    Disclaimer: I aim to build a self contained pen drive with my application inside, so no matter about updates. Maybe I'm looking at the wrong linux distribution to do this... Please let me know if you think so. I've tried knoppix and even lubuntu, but they don't come with enough "drivers" for Unity3D to work. Creating a custom live persistent pen drive is a real pain and I'm trying for 1 day without any success. Sure, being able to do it would probably be ideal and occupy the minimum space. Using the installation image on a pen drive, however, is good enough and is really easy to create. We can even do it from any OS, using UNetBootin, LiLi USB Creator or some other methods. Straight forward. Some recommend installing it on a pen drive. But that requires a lot of space and, I believe, it won't behave as good as something meant to be installed on a usb disk, because of memory management. So, there are only a few negative points on using the installation image that I can think of. Question here, is how to remove those drawbacks: Having to press "Try Ubuntu". That's the big one. Couldn't find how. Unable to load everything on memory and keep on running without the pen drive (like this) Unable to remove "Install Ubuntu 12.04 LTS" app. Setting the ISO to use maximum amount of space for the OS will leave pen drive with zero space left and any file saved within it from ubuntu is inaccessible from the outside (when plugin the pen drive and not booting from it). Am I missing something? Can those points be fixed?

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  • How to recover from failed Mysql schema update, with replication?

    - by OmerGertel
    I have two MySQL servers configured with master-slave replication. Before we deploy a new application version we: 1) STOP SLAVE 2) Take a MySQL dump of the slave. However, if a mistake is done during the deployment of the new schema version (a table is dropped by mistake, for example), having the slave intact doesn't help. Our service is write-intensive, so we can't turn it back up until we have a master working. If we now load the mysql dump back into the master, it will take a long time during which our service remains down. What is the best-practice to recover from such a mistake? How can I setup the system so I can easily promote the slave, turn on our service and only then tend to the broken database? Mainly, I'm worried with re-syncing the slave and the master after changes are done on the slave.

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  • Configuring Samba to allow Use of CUPS printer

    - by Skizz
    Having trouble with samba printing. I have a CUPS printer installed on an Ubuntu 11.04 server and that works great. When I try to configure samba to allow an XP machine to use the printer, it fails when printing. I can install the printer drivers for XP from the server and the printer appears in the XP printer control panels. When I try to print a test page from the XP machine I get this error in the system event log: Jun 27 20:33:29 FatController smbd[3571]: [2012/06/27 20:33:29, 0] rpc_server/srv_netlog_nt.c:603(_netr_ServerAuthenticate3) Jun 27 20:33:29 FatController smbd[3571]: _netr_ServerAuthenticate3: netlogon_creds_server_check failed. Rejecting auth request from client JAMES machine account JAMES$ Here's my smb.conf file: [global] server string = %h (Server) workgroup = SODOR encrypt passwords = true security = user os level = 255 preferred master = yes domain master = yes local master = yes logon path = \\%L\profile\%U logon drive = S: logon home = \\%L\home\%U domain logons = yes map to guest = Never guest ok = no dns proxy = no time server = yes logon script = logon.bat load printers = yes printing = cups printcap name = cups nt acl support = no interfaces = eth1 lo bind interfaces only = yes smb ports = 445 [netlogon] comment = Net Log On path = /home/samba/netlogon guest ok = no read only = yes browseable = no [profile] comment = User Profiles path = /home/samba/profiles read only = no create mask = 0600 directory mask = 0700 browseable = no store dos attributes = yes [printers] comment = All Printers path = /var/spool/samba browseable = yes guest ok = no printable = yes [print$] comment = Printer Drivers path = /var/lib/samba/printers browseable = yes guest ok = no read only = yes write list = root, skizz Anyone know what the problem is and how to fix it? In addition to the above, I also get this error: Jun 27 21:56:35 FatController smbd[3571]: [2012/06/27 21:56:35, 0] printing/print_cups.c:1027(cups_job_submit) Jun 27 21:56:35 FatController smbd[3571]: Unable to print file to `Edward' - client-error-not-authorized which I think is more relevant.

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  • Best Configuration for Performance - ffmpeg streaming / mp4 /flv

    - by Sam Alex
    I have some mpeg video files and a web page. A visitor comes to that web page and according to the selected options, a php script calls ffmpeg and combines the different mpeg files and then converts it to a mp4 file. That mp4 file is then shown to the visitor using flowplayer. The MP4 creation takes some time and flowplayer takes some time to load the file. What do you think is the best way to accomplish this task ? Should i go for streaming server ? I need to reduce the time taken for conversion. Will converting to FLV be faster ?

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  • Trigger IP ban based on request of given file?

    - by Mike Atlas
    I run a website where "x.php" was known to have vulnerabilities. The vulnerability has been fixed and I don't have "x.php" on my site anymore. As such with major public vulnerabilities, it seems script kiddies around are running tools that hitting my site looking for "x.php" in the entire structure of the site - constantly, 24/7. This is wasted bandwidth, traffic and load that I don't really need. Is there a way to trigger a time-based (or permanent) ban to an IP address that tries to access "x.php" anywhere on my site? Perhaps I need a custom 404 PHP page that captures the fact that the request was for "x.php" and then that triggers the ban? How can I do that? Thanks! EDIT: I should add that part of hardening my site, I've started using ZBBlock: This php security script is designed to detect certain behaviors detrimental to websites, or known bad addresses attempting to access your site. It then will send the bad robot (usually) or hacker an authentic 403 FORBIDDEN page with a description of what the problem was. If the attacker persists, then they will be served up a permanently reccurring 503 OVERLOAD message with a 24 hour timeout. But ZBBlock doesn't do quite exactly what I want to do, it does help with other spam/script/hack blocking.

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  • Why can't I access a particular website even though the server appears to be available

    - by 50ndr33
    I can't access http://www.lynda.com/ with any of my browsers on my home network. By checking http://www.downforeveryoneorjustme.com/, I can see that the server is up and I can access it via a proxy like TOR. This screen appears immediately after I type the page in It doesn't even try to load the page, it seems. Though when I ping the server I get this: I tried to do ipconfig /flushdns. But it didn't help either. Anyone know how to fix this?

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  • .htaccess url rewriting problem

    - by letsworktogether
    I'm kind of stuck at this part and was hoping that I'd get some assistance. I'm building a highscores page in PHP, that's going great, it works. however, I dislike the idea of "index.php?skill=name" and therefore wanted a bit of SEO in this. I have successfully replaced the url with a more friendly version: "highscores/skill/name" And this is where the problem starts, I have added pagination to the highscores and the page is read from the HTTP_GET page variable ($_GET['page']). I dislike the idea of "highscores/skill/name&page=2" and was hoping if you guys could assist me to make the url like the following: Page 1, so accessing the file without declaring the page number: DOMAIN.TLD/highscores/skill/name Page 1 so now the page variable is needed:DOMAIN.TLD/highscores/skill/name/2 As you can tell the "2" will define page 2 and load the correct data for page 2. However, I'm having much trouble in my .htaccess file to configure it this way. RewriteRule ^highscores\/skill\/(.*?)(\/(.*?)*)$ highscores/skills.php?skill=$1&page=$2 [L] # Skills page That is my latest attempt in order to get it to work, unfortunately it does not work, it makes the page look horrible (CSS doesn't work) and it doesn't go to the page specified on the URL. I hope you understand my issue, thank you!

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  • How to do Cross Platform in own Engine? [on hold]

    - by Mineorbit
    At the Moment I finished the first game with my game engine(if I wanna call it like that) which is based in LWJGL. Now i'm worring if I could do crossplattforming in my engine. I build me a tool tool with a batch file to compile my project dir into an .exe . At first i'm looking to do it on Android with an comparable batch file. An link for an tutorial would be awesome! At next place there would be an renderer and audiosystem. If read that theres an OpenGL ES renderer, and I allready played a bit around with the Android SDK. But I use the Texture and Audio class in slick-util. So I thought about creating OOP classes that carry around the data and load it in an platform specific Buffer. A Link for an equaly easy-to-use Texture or Audio class would be awesome! Thats all for now! Answers would be awesome! Thanks, Mineorbit!

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  • APC module causing strange error

    - by clifgriffin
    When I run php -v I get: PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/apc.so' - /usr/lib64/php/modules/apc.so: undefined symbol: php_pcre_exec in Unknown on line 0 This isn't my first rodeo. I've setup APC multiple times. This is a MediaTemple Dedicated Virtual 4.0 with Plesk 11. Plesk 11 is the only thing essentially different from the other servers I've set this up on. I've verified that pcre-devel is installed. I've compiled APC from source as well as used pecl to install it. No difference. I also tried downgrading to APC 3.0.19, with no love.

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  • Architectural and Design Challenges with SOA

    With all of the hype about service oriented architecture (SOA) primarily through the use of web services, not much has been said about potential issues of using SOA in the design of an application. I am personally a fan of SOA, but it is not the solution for every application. Proper evaluation should be done on all requirements and use cases prior to deciding to go down the SOA road. It is important to consider how your application/service will handle the following perils as it executes. Example Challenges of SOA Network Connectivity Issues Handling Connectivity Issues Longer Processing/Transaction Times How many of us have had issues visiting our favorite web sites from time to time? The same issue will occur when using service based architecture especially if it is implemented using web services. Forcing applications to access services via a network connection introduces a lot of new failure points to the application. Potential failure points include: DNS issues, network hardware issues, remote server issues, and the lack of physical network connections. When network connectivity issues do occur, how are the service clients are implemented is very important. Should the client wait and poll the service until it is accessible again? If so what is the maximum wait time or number of attempts it should retry. Due to the fact of services being distributed across a network automatically increase the responsiveness of client applications due to the fact that processing time must now also include time to send and receive messages from called services. This could add nanoseconds to minutes per each request based on network load and server usage of the service provider. If speed highly desirable quality attribute then I would consider creating components that are hosted where the client application is located. References: Rader, Dave. (2002). Overcoming Web Services Challenges with Smart Design: http://soa.sys-con.com/node/39458

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  • Booting Windows7 kernel from an initrd/wim image file

    - by Ivo
    I'm wondering if it's possibile to have Win7 kernel and relative drivers (especially storage drivers) to boot from an initrd-like image file (maybe .wim?) and later then mount the windows root partition and complete the load of the full OS? I'll try to explain why: I'm running an emulated environment with NO REAL BIOS, and I'm passingthrough a raid storage controller. I want windows to boot from this controller array, but of course the BCD manager cannot access disks in the array until kernel and relative controller storage drivers are loaded. To be clear I get the classical winload.exe missing error. I need a similar solution to what Linux does, loading the kernel and his drivers, and later then mount the root partition and complete the boot. Any ideas or advices?

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  • Problems with Maverick upgrade

    - by altenuta
    I upgraded to Maverick 10.10 from Lucid. I have an old Toshiba Satellite with a 1.1 MHz and 256MB RAM. Initially I couldn't get my wireless to work. That solved itself after installing various updates and programs. The problems that remain are: I have to authorize at least 2 times at start-up. This machine is Ubuntu only. No boot load screen. I have a ton of programs and system directories that are in my home folder. Is this normal? It is difficult to wake the computer from sleep. Usually I just shut it down and restart. Tonight I waited and got a message about corrupt memory. The computer takes forever to do just about everything. Slow to start programs or doing things on the web. I am a longtime Mac user (since 1986). I also manage a network of several windoze machines. I am definitely a GUI guy and do very little in the terminal so I really need to know where to begin to get things straightened out. Can I rescue this machine without wiping it and doing a fresh install? This is basically a hobby machine. Aside from all the programs and upgrades I've installed, I have almost no files or documents to worry about saving. Anyone have any ideas about the problems I'm having and the best way to proceed? Thanks, Al

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  • Install Git on my Media Temple (dv) 4.0 server

    - by Chris
    I'm trying to install Git on my Media Temple (dv) 4.0 server. I've followed these instructions: http://wiki.mediatemple.net/w/%28dv%29_4.0:Install_GIT It seems to have "installed", as there are a boat load of files in the following directory: /root/git-2012-06-06 However, when I perform any git command in the server: git: command not found My assumption is that something, somewhere isn't configured properly, but I have no idea where to start. Could anybody lend a hand / offer some pointers? (And if you hadn't guessed, I'm pretty new to all this, so please be kind!) Thanks very much Chris

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  • Ubuntu connects to wireless but doesn't work!

    - by UbuntuUser990
    I just installed Ubuntu 14.04 LTS on my laptop, it connects to my wireless network and shows that it is connected, but when I try to load a webpage or do anything like download Steam for Dota 2, it doesn't work. When I try to connect my Facebook account to Ubuntu, it doesn't work. I want to be able to use Ubuntu with working internet access. What do I do?. ifconfig this shows up eth0 Link encap:Ethernet HWaddr 88:ae:1d:60:56:eb inet addr:192.168.1.13 Bcast:192.168.1.255 Mask:255.255.255.0 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:16 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:24 errors:0 dropped:0 overruns:0 frame:0 TX packets:24 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:1856 (1.8 KB) TX bytes:1856 (1.8 KB) When I type ping askubuntu.com this shows up ping: unknown host askubuntu.com

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  • Unable to install ubuntu on a AMD 64 bit system with a AMD Radeon HD 6670 graphics card

    - by Tom Wingrove
    I’ve been running a dual boot system (Ubuntu/Windows7) for two years or so with no problems. I recently built an AMD 64 Bit System, re-installed Windows but when I went to load Ubuntu inside Windows, hit a snag. The screen view during installation became small square blocks of colour, which obviously is a graphics drive problem. I tried various live disks both 32 & 64 bit for, Ubuntu 12.04, 11.10 & 10.10, all but Ubuntu 10.10 had the same problem. Ubuntu 10.10 loaded ok, installed the presented ATI graphics driver as usual but was left with the AMD Unsupported watermark at the bottom right of the screen. The graphics card installed in the computer is an MSI ATI Radeon HD 6670 (in effect an AMD Radeon HD 6670). I am fairly new to linux and while I can install and tweak the OS, I am rather baffled as to what to do. So my question is will an up to date ATI Driver be released in the near future for installation/live disks? Or am I going to have to downgrade my graphics card to use linux? Yours Tom Wingrove

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  • How to automatically resume php-fpm?

    - by alfish
    I am using nginx+php-fpm on Debian Squeeze for a busy server and have had great difficulty to deal with maximum connections being reached. Here the problem is that php processes sometimes just die randomly under high load and leave the server with no php process. Then I need to manually restart php5-fpm service to bring back the server to life. I am wondering how to avoid this to happen, or at least treat the symptoms by restarting the php5-fpm automatically whenever there is not php process left to listen to incoming requests. My relevant configs are: pm = dynamic pm.max_children = 1400 pm.start_servers = 10 pm.max_spare_servers = 20 pm.process_idle_timeout = 1s; #not sure it will be useful when pm=dynamic pm.max_requests = 100000 request_terminate_timeout = 30 I appreciate your suggestions to cope with this nasty problem.

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  • Basic procedural generated content works, but how could I do the same in reverse?

    - by andrew
    My 2D world is made up of blocks. At the moment, I create a block and assign it a number between 1 and 4. The number assigned to the nth block is always the same (i.e if the player walks backwards or restarts the game.) and is generated in the function below. As shown here by this animation, the colours represent the number. function generate_data(n) math.randomseed(n) -- resets the random so that the 'random' number for n is always the same math.random() -- fixes lua random bug local no = math.random(4) --print(no, n) return no end Now I want to limit the next block's number - a block of 1 will always have a block 2 after it, while block 2 will either have a block 1,2 or 3 after it, etc. Before, all the blocks data was randomly generated, initially, and then saved. This data was then loaded and used instead of being randomly called. While working this way, I could specify what the next block would be easily and it would be saved for consistency. I have now removed this saving/loading in favour of procedural generation as I realised that save whiles would get very big after travelling. Back to the present. While travelling forward (to the right), it is easy to limit what the next blocks number will be. I can generate it at the same time as the other data. The problem is when travelling backwards (to the left) I can not think of a way to load the previous block so that it is always the same. Does anyone have any ideas on how I could sort this out?

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  • Nginx request forking

    - by Adam
    Hi, I'm wondering if nginx can "fork" a request. Let's imagine config: upstream backend { server localhost:8080; ... more servers here } server { location /myloc { FORK-REQUEST http://my-other-url:3135/something proxy_pass http://backend; } } I would like nginx to send a copy of request to the url specified by FORK-REQUEST and after that to load balance it with backend servers and return the response to the client. As I don't need the response from FORK-REQUEST it would be best if this request was async so normal prcessing doesn't have to wait. Is a scenario like this possible?

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  • Grub does not show a Windows 8 option after dual boot

    - by skytreader
    So, I've successfully dual-booted my Windows 8 machine with Ubuntu 12.04 . However, I still don't have a convenient method of choosing what OS to load at boot time. After installing Ubuntu, my computer still loads Windows 8 directly. I then added grubx64.efi to the white list of my boot loader. But after that, my machine loads Ubuntu directly without even a shadow of GRUB showing up! I used boot-repair and I got this paste.ubuntu URL: paste.ubuntu.com/1326074. After running boot-repair (and re-white listing the grubx64.efi file), GRUB now shows up but without any Windows 8 option! Lastly, I ran sudo fdisk -l and it gave me this: WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sda: 750.2 GB, 750156374016 bytes 255 heads, 63 sectors/track, 91201 cylinders, total 1465149168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x6396389f Device Boot Start End Blocks Id System /dev/sda1 1 1465149167 732574583+ ee GPT Partition 1 does not start on physical sector boundary. I'm guessing my problem has something to do with the warning from fdisk above but I don't know what to do with it. How do I proceed now?

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  • loading 60 images locally fast is it possible...? [closed]

    - by Tariq- iPHONE Programmer
    when my app starts it loads 60 images at a time in UIImageView and it also loads a background music. in simulator it works fine but in IPAD it crashes.. -(void)viewDidLoad { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; //img.animationImages = [[NSArray arrayWithObjects: MyImages = [NSArray arrayWithObjects: //[UIImage imageNamed: @"BookOpeningB001.jpg"],...... B099,nil]; //[NSTimer scheduledTimerWithTimeInterval: 8.0 target:self selector:@selector(onTimer) userInfo:nil repeats:NO]; img.animationImages = MyImages; img.animationDuration = 8.0; // seconds img.animationRepeatCount = 1; // 0 = loops forever [img startAnimating]; [self.view addSubview:img]; [img release]; [pool release]; //[img performSelector:@selector(displayImage:) ]; //[self performSelector:@selector(displayImage:) withObject:nil afterDelay:10.0]; [self performSelector: @selector(displayImage) withObject: nil afterDelay: 8.0]; } -(void)displayImage { SelectOption *NextView = [[SelectOption alloc] initWithNibName:nil bundle:nil]; [self presentModalViewController:NextView animated:NO]; [NextView release]; } Am i doing anything wrong ? Is there any other alternative to load the local images faster in UIImageView !

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