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  • What is the preferred pattern when attaching a 'runtime object'?

    - by sebf
    In my application I have the following: public class NeatObject { /* lots of static data, and configuration flags */ } public class NeatObjectConsumer { void DoCleverStuffWithObjectOnGPU(NeatObject obj); } Where NeatObject and its consumer are used to control the GPU. The idea being that, the configuration of an instance of NeatObject and its members, define how the consumer instance behaves. The object can be passed around, edited, and most importantly serialised/deserialised by the application, with and without knowledge of NeatObjectConsumer, then provided back to the consumer to do something else. The purpose of this seperation is: The consumer manages hardware resources, which change depending on the computer, and even on the execution of the application, making preserving the state of an object which does everything difficult. Avoids circular references if the assembly that contains the consumer needs to reference one that only needs to know about NeatObject. However, there is a complication in that the consumer creates hardware resources and needs to associate them with NeatObject. These don't need to be preserved, but still need to be retrieved. DoCleverStuffWithObjectOnGPU() will be called many, many times during execution and so any bottleneck is a concern, therefore I would like to avoid dictionary lookups. What is the preferred method of attaching this information to NeatObject? By preferred, I mean intuitive - other coders can see immediately what is going on - and robust - method doesn't invite playing with the resources or present them in such a way as to make them easily corruptible. Essentially, I want to add my own metadata - how should I do it? Try to use 'actual metadata' functionality like Reflection? A member of the type of an abstract class? Unmanaged pointers? If you took on a project that used this pattern, what would you have liked the previous developer to do?

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  • How do I use a custom 503 error page with Nginx?

    - by Michael Gorsuch
    Hi. I have implemented rate limiting with Nginx (which works excellently, by the way) and would like to display a custom 503 error page. I have followed examples on the web without luck. I am running a simple configuration that looks something like this: listen x.x.x.x:80 server_name something.com root /usr/local/www/something.com; error_page 503 /503.html; location / { limit_req zone=default burst=5 nodelay; proxy_pass http://mybackend; } The idea is that our rate limited users would be shown a special page explaining what was going on. The rate limiting is working, but the built-in 503 page is rendering. Any ideas?

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  • Minimizing use of paper

    - by Abody97
    I've recently faced this problem in a dynamic programming curriculum, and I honestly have no idea about how to determine the appropriate state. You're given N (1 <= N <= 70) paragraphs and M (1 <= M <= N) figures. Each paragraph i requires PL_i (1 <= PL_i <= 100) lines and references at most one figure. Each figure is referenced exactly once (i.e., no two paragraphs can reference the same figure, and for each figure there's a paragraph that references it.) Each figure requires PF_i (1 <= PF_i <= 100) lines. The task is to distribute those figures and paragraphs on paper in the order they're given, where one paper fits for L lines at most. No paragraph or figure is too large to fit on one paper. If a paragraph x placed on paper x_p references a figure y then y must be placed on either the paper x_p - 1 or x_p or x_p + 1. We have to find the minimum number of lines (and thus pages) to allocate in order to distribute all the figures and paragraphs. Any help would be extremely appreciated. Thanks in advance!

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  • What is the best approach for deploying apps to companies

    - by Supercell
    What is the best approach for the following scenario: 1) A publicly available app (available in app stores) which is used by end users to make use of services offered by multiple companies. 2) These companies maintain their services also using a mobile app. I'm not sure on how to solve the second part. Having one app for both enduser and admin functionality, secured by username/password doesn't sound like a good idea. This would leave the only option of developing a separate admin application for the companies. What is the best approach to deploy "admin" like mobile apps to companies only, for Android, iOS and Windows Phone? Some additional information: Public App ---- Servers ----- Multiple Company Apps The public app shows all companies offering their services. An end user uses the public app to order something from a specific company. The order is sent to our servers. Our servers send the order to the associated company. This order is displayed on the company's admin app and given the option to accept the order.

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  • What kinds of languages would be most useful for this kind of webapp?

    - by Caedar
    I've had some experience with programming in the past (2-3 years of C++ self-teaching), so I'm no stranger to the programming process, but there are so many languages out there that I'm lost when thinking about this project idea that's been floating around my head: I would like to create a webapp that would be used for helping somebody figure out what kinds of productivity tools would suit them. The first part of the app would basically be a survey with a variety of questions that would help weed out tools that wouldn't be useful for them. (Slider bar between minimalist and maximizer, slider bar between all free apps and no cost limit, checkboxes on what platforms are required, etc.) While the person is filling out the survey, they will see a web of applications, webapps, and other tools forming on the screen with links showing the relationships the programs have with eachother (syncing supported, good combinations of apps, etc.), along with a list of applications below sorted by general use (notetaking, document organization, storage, etc.) I would imagine that each program entered into the database that will be accessed would have a certain set of characteristics, ie. price, user friendliness, platforms supported, general uses, etc. and the survey would be designed to correlate to those elements and remove programs that don't match the criteria set. The difficult part of this entire process would be getting the web of applications to arrange itself and render properly. Now that I've finished mind-dumping, onto my question: What kinds/combinations of programming languages would you imagine being useful for this kind of project, and why? I learn best by setting up a project for myself like this one and tinkering with the languages, so I don't mind if the end product is out of reach from my current skill level. I'd just like some guidance so I don't fumble in the dark for too long.

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  • rsync: files copied with hidden attribute

    - by haritan
    I run a backup from Windows 7 machine to Mac machine running Mountain Lion using rsync that is packaged in DeltaCopy application. I can't use DeltaCopy interface because the destination is a mapped drive (Mac's samba drive). So here is my setup: I have a folder in Mac that is the destination folder and I share this folder via Samba share. On windows machine, I map this samba share to a drive (let's say M:/) I run rsync: rsync -arv --delete "/cygdrive/C//origin/" "/cygdrive/M//mybackup/" it runs fine except that all files on the destination are hidden. Anyone has an idea on what's happening here? I really appreciate any feedback. Thank you.

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  • Deployed Web Application Requests for User Name and Password

    - by user43175
    Deployed Web Application Requests for User Name and Password I recently deployed a .NET web application into the server. Authentication mode is set to Windows (since the application is accessible only to Intranet users. Testing some machines, the application loads up properly. For some machines, a logon dialog window appears asking for User Name or Password. These dialog windows are those that you also normally see when you are trying to log into a Windows domain. Any idea why this happens randomly? Thanks.

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  • Need to include Calendar and Email in own CRM system. Whose?

    - by PurplePilot
    I am writing a web based application that needs to have some elements of CRM in it but I cannot use an of-the-shelf CRM to do what I want. (Honestly we have been through it all and it will not work). Now while Tasks, Calls, Meetings and Notes are straightforward the idea of reinventing Mail and Calendars seems a waste of time and effort and also unproductive as most users already have their own and it simply adds to the complexity of my application and hacks users off. My thoughts are going around using Outlook and or GMail/iCal and or Mac Mail/iCal and or Thunderbird and importing the relevant data or if possible integrating it into the application. Any thoughts? Anyone got any experience of this can point me in a few directions. N.B. Not looking for an answer as too complex just some pointers and thoughts. Thanks. p.s. We did look at Sugar CRM as the basis for our project and it is useful to get best practice from but as I say it was not useable due to how we are structuring our software, not Sugar's fault.

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  • Unmasking fake IP address

    - by Omousso
    I need to unmask I masked IP..that has hacked my account & a family members account(s)... Can anyone help me...I have know no Idea where to start and know nothing about even where to begin. PLEASE someone reply, this is not a random hacking but someone trying to cause my family trouble...at least my instinct says so. My family member and myself both believe we know who it is.. They have gotten into several of my accounts and I've been acting is I don't know...tracking ip's..but I feel like they are masked! Also, my family member changed there email/password numerous time and they still got in....how?? Any & all help is appreciated!!

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  • web server and database server distance

    - by Erkan
    I want to seperate my server into two parts: web server and dbserver. My web server is located in Turkey and my dbserver is located in Germany. I cant change my web server because my agreement is based on my Ip adresses. I want to locate my dbserver in Germany because more cheap then Turkey. But... I have a problem in here. When you call a db action, first, you are going to Turkey for IIS and IIS is going to Germany for Dbserver. It is too far and so slow to response back. Any idea? Is it wrong that the distance is so far between web server and dbserver? Or Are there any solutions for this problem?

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  • my.ini optimization on Windows 2008 R2 VPS

    - by MKphpDev
    I have a vmware VPS running Windows Server 2008 R2 Enterprise that has performance issues with MySQL. Every few minutes, MySQL stall for few seconds then responed to queries. I'm sure that my.ini need to be optimized, but unfortunately, I don't have any idea of my.ini configuration. What's running on the server: 2 small wordpress blogs, 1 vbulletin forums (approx. 1.2 GB database, and increasing), small database for some sort of plug-ins (no more than 4000 records) Server Info: Processor: Intel Xeon X5550 @ 2.67GHz, RAM: 6 GB (memory useage never exceeded 2 GB), MySQL 5.5, PHP 5.3.10, IIS 7 current my.ini: [mysqld] default-storage-engine=INNODB sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE _USER,NO_ENGINE_SUBSTITUTION" max_connections=250 myisam_max_sort_file_size=20G innodb_additional_mem_pool_size=256M innodb_flush_log_at_trx_commit=1 innodb_log_buffer_size=8M innodb_buffer_pool_size=512MB innodb_log_file_size=128M innodb_thread_concurrency=10 key_buffer_size = 512M myisam_sort_buffer_size = 8M join_buffer_size = 256K read_buffer_size = 256K sort_buffer_size = 256K table_cache = 4000 thread_cache_size = 200 wait_timeout = 30 connect_timeout = 10 tmp_table_size = 32M max_allowed_packet = 1M max_connect_errors = 10000 query_cache_size = 16M query_cache_limit = 2M query_cache_type = 1 query_cache_min_res_unit = 1024 query_prealloc_size = 16384 query_alloc_block_size = 16384 skip-external-locking read_rnd_buffer_size=1M max_heap_table_size=16M thread_concurrency=8 [mysqld_safe] open_files_limit = 8192 [mysqldump] quick max_allowed_packet = 16M [myisamchk] key_buffer_size = 128M sort_buffer_size = 128M read_buffer = 2M write_buffer = 2M any help with that, please?

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  • ipfw is blocking access to a script

    - by user225551
    I need to figure out how to troubleshoot why ipfw is blocking my script. This script parses out some rss feeds over the net. I have about 10 different feed urls. About 5 or 6 of these urls are returning xml, the others are timing out. If I turn the firewall off, they will all work. The issue I'm having is that I have no idea what port I need to open for the urls that are timing out. Is there a command that will show me this?

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  • Problems with 3D transformation - (SharpDX)

    - by Morphex
    First of all , I have been trying to get this right for a couple of day already, I have read so much info and still fail miserably to understand this. So I am going to tell you that even though I have done fairly amount of research myself, I failed to implement it. I must say miserably I am trying to create a generic camera class for a game engine of sorts - for research purposes only - the thing is I have no idea how to go about it. I have read about quaternions and matrices, but when it comes to the actual implementation I suck at it. Sharpdx has already Matrices and QUaternions implemented. SO no big deal on the map behind it. How in the world would I go about creating a camera? I have seen so many camera examples and still can't make one that works as expected. I would like to implement diferent types too (Orbital, 6DoF, FPS). So what is need for a camera? UP, Forward and Right vectors I read they are needed, also a quaternion for rotations, and View and Projection matrices. I understand that a FPS camera for instance only rotates around the World Y and the Right Axis of the camera. the 6DoF rotates always around their own axis, and the orbital is just translating for set distance and making it look always at a fixed target point. The concepts are there, now implementing this is not trivial for me. Can anyone point me on what am I missing, what I got wrong? I would really enjoy if you could give a tutorial, some piece of code, or just plain explanation of the concepts. Thank you for readin, a frustrated coder.

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  • How do you assign resources and keep begin, end and duration of a task intact?

    - by Random
    I have problems with assigning more than one resource to a group of tasks. The idea is simple, my tasks are in one group and are manually scheduled to particular begin and end dates. I want to assign more than one resource to keep task duration and dates (fixed duration) and increase work. For top level tasks it works fine but as long tasks are grouped, the duration of each is extended to reach group end date and work remains. For the problematic tasks, the Gantt chart looks like this: One resource attached (good) ( Task 1.1 ) ( Task 1.2 ) (Task 1.3) More than one resource attached (wrong) ( Task 1.1 )....................... ( Task 1.2 ).......... (Task 1.3) So for tasks like that, I want to have a fixed schedule and just increase work by adding resources that work in the same time, but sometimes MS Project does leveling to do resources work sequentialy.

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  • Request to server x Reply from server y

    - by klaasio
    I need some advice from you guys: I'm dealing with a custom loadbalancer/software for which we will use 2 main servers and about 8 slave servers. In short: User sends request to main server, main server will receive and handle the requests, sends a request to a slave server and slave server should send data DIRECTLY to the "user". User - Main server Main server - Slave server Slave server - User The reason for which data should be send directly to the user and not through the main server is because of bandwidth and low budget. Now I have the following idea's: -IPinIP, but that is not possible in Layer7 (so far i know there some expensive routers for that) -IP Spoof, using C/C++ we will make it look like the reply came from main server. But I was thinking, perhaps the reply "slave server - User" could just come from a different IP without causing issues in the firewall from the user or his anti-virus. I don't know so well about "home" firewalls/routers and/or anti-virus software. I guess the user machine wouldn't handle it well?

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  • Possible? OpenVPN server requiring both certificate- AND password-based login (via Tomato router firmware)

    - by Eric
    I've been using Shibby's build of Tomato (64k NVRAM version) on my Asus N66U router in order to run an OpenVPN server. I'm curious whether it's possible to setup this OpenVPN server to require both a certificate AND a username/password before a user is allowed access. I noticed there's a "challenge password" entry when filling out the certificate details, but everyone says to leave it blank "or else"; I have no idea why, and I can't find an explanation. In addition, I've Google'd this issue a bunch and have noticed people talking about a PAM module for OpenVPN in order to authenticate via username/password, but that appeared to be an either/or option; in other words, I can force authentication via username/password OR certificate. I want to require both. Is this possible? If so, how?

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  • GL_INVALID_OPERATION in glEnd

    - by Killrazor
    Hello, I'm having problems drawing a simple sprite. When I draw: void CSprite2D::render() { CHECKGL(glLoadIdentity()); CHECKGL(glEnable(GL_TEXTURE_2D)); CHECKGL(glEnable(GL_BLEND)); CHECKGL(glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)); m_texture->bind(); //CHECKGL(glPushMatrix()); CHECKGL(glBegin(GL_TRIANGLE_STRIP)); CHECKGL(glNormal3i(0,0,1)); CHECKGL(glTexCoord2f(m_textureAreaStart.s,m_textureAreaStart.t)); // 0,0 by default CHECKGL(glVertex3i(m_position.x,m_position.y,0)); CHECKGL(glNormal3i(0,0,1)); CHECKGL(glTexCoord2f(m_textureAreaEnd.s,m_textureAreaStart.t)); // 1,0 by default CHECKGL(glVertex3i( m_position.x + m_dimensions.x, m_position.y, 0)); CHECKGL(glNormal3i(0,0,1)); CHECKGL(glTexCoord2f(m_textureAreaEnd.s, m_textureAreaEnd.t)); // 1,1 by default CHECKGL(glVertex3i( m_position.x + m_dimensions.x, m_position.y + m_dimensions.y, 0)); CHECKGL(glNormal3i(0,0,1)); CHECKGL(glTexCoord2f(m_textureAreaStart.s, m_textureAreaEnd.t)); // 0,1 by default CHECKGL(glVertex3i( m_position.x, m_position.y + m_dimensions.y,0)); CHECKGL(glEnd()); //CHECKGL(glPopMatrix()); CHECKGL(glDisable(GL_BLEND)); } I'm always get an GL_INVALID_OPERATION in glEnd(). I suspect that error is not here, but I can't detect where may be. Actually, the output render seems ok. But I want to solve this situation before to catch a subtle bug tomorrow. Any idea of what could be

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  • Chef: Load Attributes from encrypted databag in json role

    - by jcvj
    I'm want to use the postfix cookbook for chef. The sasl password is expected to be in an attribute. So usually you would do this: "default_attributes": { "postfix": { "sasl": { "smtp_sasl_passwd": "somepassword" } } } The thing is: I don't want to have the password in the repository in plain text. So I put it in an encrypted data bag. Now I want to access it. This can be done with this: Chef::EncryptedDataBagItem.load("passwords", "postfix")['password'] The problem: This only works in a .rb file, but my role is in json; all my roles are in json! I don't want to change that just for this purpose. Does anybody have an idea what to do here? Help is very appreciated.

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  • Data structure for grid with negative indeces

    - by The Secret Imbecile
    Sorry if this is an insultingly obvious concept, but it's something I haven't done before and I've been unable to find any material discussing the best way to approach it. I'm wondering what's the best data structure for holding a 2D grid of unknown size. The grid has integer coordinates (x,y), and will have negative indices in both directions. So, what is the best way to hold this grid? I'm programming in c# currently, so I can't have negative array indices. My initial thought was to have class with 4 separate arrays for (+x,+y),(+x,-y),(-x,+y), and (-x,-y). This seems to be a valid way to implement the grid, but it does seem like I'm over-engineering the solution, and array resizing will be a headache. Another idea was to keep track of the center-point of the array and set that as the topological (0,0), however I would have the issue of having to do a shift to every element of the grid when repeatedly adding to the top-left of the grid, which would be similar to grid resizing though in all likelihood more frequent. Thoughts?

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  • Why is the System process listening on Port 443?

    - by Cornelius
    I am having problems starting my apache server, because port 443 is already in use. It turns out, the system process (PID 4) uses the port 443. I don't have IIS installed, the services.msc shows (predicatbly) no Exchange server running, nor WWW-Services, nor IIS. I have no idea how to find out what service uses that port short of just disabling each service one after the other, and I am not even sure that would help. I would be grateful if someone could point me towards how I can get my SSL port back, thank you :) P.S.: Of course "just switch apache to another port for SSL" would solve the problem of not being able to start apache. But I'd still like to know what is so insistent about hogging port 443. :) Edit: I by now took the 'hard route' and disabled services one after the other. It turned out that the "Routing and RAS" service was the culprit. Thank you all for the valuable input and the new tools in the combat against "WTF does my system do now".

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  • What kind of projects are suited as a portfolio? [on hold]

    - by Asyx
    I was thinking about finishing up some hobby projects I used myself or am planing to use myself but I'm not sure if a future employer might be put off by them. For example, if I decided to create a custom website for an online (gaming, maybe) community instead of using an existing CMS, is it a good idea to provide a link to said community website or should I just put up the CMS and pretend like nobody actually uses it? Also, what about very specific things? I like linguistics and constructing languages. Obviously nobody wants to come up with 1000s of words so people usually use word generators or software to emulate sound shift or software to organise everything and produce dictionaries and such. Would such a project be too specific and too abstract for a portfolio or is the "he did programming work simply for enjoyment and his hobby and not just for money or grades" thing more important? It's quite an abstract hobby and most people don't even know that it's a thing and think the languages you hear in Game of Thrones, Avatar or Star Trek are just gibberish. Explaining such things to people is a pain to begin with especially if said people speak no other language. Would such things throw an employer off or is the content itself completely irrelevant? Thanks. Also, if this is not fitting for the programmers stackexchange, then please, don't close the thread right away but tell me where else to go because I got here though a closed question from stackoverflow. Thanks.

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  • Problem in domain name of site in google search [on hold]

    - by Jayadratha Mondal
    My domain provider dont supports advanced DNS at this moment. So I have used iframe to forward to my webserver. Suppose my domain abc.com have a simple html which is opening xyz.com via Iframe. Google was showing abc.com on the search. But from last two days it is showing xyz.com, other things like description, name of the site are ok only the domain changed to xyz.com, but I want to show abc.com. When I'm typing the full domain then google showing the domain as I want. But If I type a part or any keyword then it showing that xyz.com. Anyone have any idea how to show abc.com again? EDIT: I dont know the domain name provider because its not mine. When I'm trying to set new A record its showing that "you need advanced dns to do this currently you are using simple DNS". I'm doing this from cpanel. Normally as per I know there are 3 sections. 1 domain name 2 A record 3Cname. But I dont have any domain name section.

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  • Speeding up ping

    - by sam
    We have pretty slow internet which makes working online quite tedious some times the internet is just generally slow, 600ms ping, 0.90mb download. (we are in Londnon, can you beleive). But other times the internet download speed is ok 5-8mb but the ping in 600ms is there a way we can speed this up. Good performance would be 5-10mb 30ms ping at our location, which we sometimes get in the morning. Resetting the router always seem to solve the ping issue for about 10 minutes but then it slows down again, any idea whats governing the ping and if anything can be done to address it ?

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  • Application crashes when installing on Windows 7 but not on Windows XP

    - by JiBéDoublevé
    At my company, we're migrating from Windows XP to Windows 7. We've got 2 home made applications written in C# with the .NET framework 3.5. They use ClickOnce to be installed. We're in the test phase and the installation of these soft crashes on some Windows 7 machines and doesn't on others. The difference between these machines should be the configuration of the policies. The only error message we've got is this one: I tried to find some logs somewhere but there's nothing neither in the Event Viewer nor in the applications log (wich are poorly logged, then I'm not expecting miracle from this side :( ) These applications: work with FTP servers use WCF use old deprecated libraries (as I'm not at work, I'll edit this post when I'll have the info) use nHibernate 2 use LLBLGen use a deprecated Infragistics library export data into Excel files Did you encounter such an issue while migrating? Or do you have an idea where I should investigate on?

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  • Ubuntu 12.04 "stuttering"

    - by Totte
    When I log in to the desktop Ubuntu seems to "stutter". Doing pretty much anything causes the cursor to freeze for a few seconds, and the rest of the screen updates something like every 15 seconds (during these 15 seconds I can still move the cursor). For example, opening the home folder I first see no effect, followed by a semi-transparent home folder, and finally the folder as it should be (this can take like 30 seconds); no animation, just three individual frames. Also, I sometimes don't see a window for a program, even though the program in question is supposed to be "up". Since this is my first experience of Linux, I confess I have no idea where to start - searching the web I only found problems with complete freezes/crashes requiring rebooting, as opposed to this "stuttering". I installed Ubuntu 12.04 32bit from a bootable USB stick a couple of days ago, right after a fresh Vista 32bit install. Thinking the stuttering might stop if I updated Ubuntu, I managed to install approx 270 updates through the Update Manager, but the stuttering was still there. Apart from the updates, I haven't installed any software other than what was included on the bootable USB stick. Vista and Ubuntu are on a single Crucial m4 SSD, in a dual-boot setup, with GRUB. CPU: Intel Core 2 Quad Q6600 GPU: Nvidia GeForce 8800 GTX (with the recommended proprietary drivers) RAM: 2GB DDR2

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