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  • Software Architecture: How to divide work to a network of computers?

    - by Morpork
    Imagine a scenario as follows: Lets say you have a central computer which generates a lot of data. This data must go through some processing, which unfortunately takes longer than to generate. In order for the processing to catch up with real time, we plug in more slave computers. Further, we must take into account the possibility of slaves dropping out of the network mid-job as well as additional slaves being added. The central computer should ensure that all jobs are finished to its satisfaction, and that jobs dropped by a slave are retasked to another. The main question is: What approach should I use to achieve this? But perhaps the following would help me arrive at an answer: Is there a name or design pattern to what I am trying to do? What domain of knowledge do I need to achieve the goal of getting these computers to talk to each other? (eg. will a database, which I have some knowledge of, be enough or will this involve sockets, which I have yet to have knowledge of?) Are there any examples of such a system? The main question is a bit general so it would be good to have a starting point/reference point. Note I am assuming constraints of c++ and windows so solutions pointing in that direction would be appreciated.

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  • Windows 8: Multiple monitors with varying DPI? [closed]

    - by Sid
    Possible Duplicate: Dual monitors on Windows - How do I set a different DPI or text size on each monitor? I'm running Windows 8 on my Macbook Pro Retina (220dpi) which has an external 24" monitor (~96 dpi). In Mac OS 10.8.2, the display settings seem ok and I can actually use both displays without usability issues. I don't know what scaling settings etc it uses but it looks fine. On Windows 8, however when I boost the DPI settings to take advantage of the retina display, it blows up the display on the external monitor - text is giant sized. How can I tell Windows 8 to use the real DPI settings of each monitor? NOTE: I'm not asking for Windows 7.

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  • PHP hosting some info required [closed]

    - by mtk
    I have recently given a control of newly bought hosting space and the domain account. There is a technical team from the hosting site to help out with problems, but that is a long process, i.e. log a ticket, wait for a long time, and I don't get the correct answer in the first shot. I was wondering, if anyone has any helpful guide and how one must go with hosting a site. Any info that must be know w.r.t to cpanel? Any other useful stuff if any one has, or could point me to ? Just to give a few difficulties: The same php code working well on local machine, giving error on remote as "File not found". The file is present indeed as I have ftp'ed all the files correctly. session_start error are outputted to html page with warning "Header already sent". and many more technical things, that work well on local but not on actual hosting server. So, if anyone has any helpful stuff in this reference, as to what all changes are required or what a programmer must be aware from a hosting perspective, please let me know. Note I am hosting a PHP site with mysql db, on a shared environment.

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  • Eclipse style autohotkey commands

    - by Ph4g3
    Is autohotkey capable of interpreting hotkeys in the style of Ctrl + Shift + W, W? I would assume a script like the following would work: ^+W:: ; Windows hotkeys (Ctrl + Shift + W) O:: Run Outlook ; Subsequent 'o' pressed => Run outlook E:: Run Explorer ; return From the documentation I note that these are called vertically stacked hotkeys and cause each line to perform the same action. In the case above, I think Ctrl+Shift+W and o will both cause outlook to be launched, whereas pressing e would cause explorer to be launched. What I would like is Ctrl+Shift+W, O runs outlook and Ctrl+Shift+W, e runs windows explorer. Is there any way to cause a hotkey to perform context specific actions (much like in Eclipse), where I can press Ctrl+Shift+W to activate a block of specific hotkeys?

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  • OpenVPN and Squid Setup troubleshooting

    - by Adam
    I am trying to setup squid to tunnel via openvpn so that I can just enter an Ip and port in my browser settings and use it as a US proxy. My server is a OpenVZ VM. Running into some issues: I setup openvpn using : http://safesrv.net/install-openvpn-on-centos/ as part of that guide I also ran: iptables -t nat -A POSTROUTING -o venet0 -j SNAT --to-source iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to-source Installed squid using this guide: http://www.server-world.info/en/note?os=CentOS_6&p=squid from that guide changed acl lan src 10.0.0.0/24 to acl lan src 10.8.0.0/24 Next, I went to my browser proxy settings and put - 10.8.0.1 in the HTTP field. Put the port I had setup in the squid config file and tried to load a page. Nothing connecting. Any help? What am I doing wrong?

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  • C++ Parallel Asynchonous task

    - by Doodlemeat
    I am currently building a randomly generated terrain game where terrain is created automatically around the player. I am experiencing lag when the generated process is active, as I am running quite heavy tasks with post-processing and creating physics bodies. Then I came to mind using a parallel asynchronous task to do the post-processing for me. But I have no idea how I am going to do that. I have searched for C++ std::async but I believe that is not what I want. In the examples I found, a task returned something. I want the task to change objects in the main program. This is what I want: // Main program // Chunks that needs to be processed. // NOTE! These chunks are already generated, but need post-processing only! std::vector<Chunk*> unprocessedChunks; And then my task could look something like this, running like a loop constantly checking if there is chunks to process. // Asynced task if(unprocessedChunks.size() > 0) { processChunk(unprocessedChunks.pop()); } I know it's not far from easy as I wrote it, but it would be a huge help for me if you could push me at the right direction. In Java, I could type something like this: asynced_task = startAsyncTask(new PostProcessTask()); And that task would run until I do this: asynced_task.cancel();

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  • Java and Sendmail HELO requires domain address

    - by ealgestorm
    I am trying to set up emailing from a java web application hosted on a linux server (Cent OS) in apache. Sendmail is working fine from the command line as root on localhost but when trying to send emails from the java web app (also on the same server from localhost) the following java exception is thrown. 501 5.0.0 HELO requires domain address EDIT: I have read that some people have found this is due to an incorrect hosts entry currently the hosts file contains 127.0.0.1 Centos-VPS localhost.localdomain localhost and i'm not sure what the Centos-VPS bit at the start is for but this is a clients hosted server so don't really want to break stuff EDIT see the RFC is helpful ... 501 Syntax error in parameters or arguments Now I know what the problem is! (note the sarcasm people.)

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  • USB flash drive showing empty but half of the capacity is in Used

    - by tamakisquare
    Not sure if I should post my question in superuser, but it looks like the most appropriate place among all StackExchange sites. I have a 16GB Kingston DataTraveler USB drive. When I tried to use it this morning, it showed up nothing in there but yet its details showed that half of the capacity was in used. I tried it with OS X, Ubuntu, and Windows 7 and the results were the same. I tried to create a new folder and it worked. Apparently, the drive is working but somehow not showing my previously stored data. Note that I was still using the drive last night and there wasn't any problems. Following @rob's suggestion, du -h gave me: 16K ./.Trashes 960K ./.Spotlight-V100/Store-V1/Stores/2620683B-A38B-42F4-A247-45CAF4826ADE 976K ./.Spotlight-V100/Store-V1/Stores 1008K ./.Spotlight-V100/Store-V1 1.0M ./.Spotlight-V100 1.1M And, df -h gave me: /dev/sdb1 15G 7.9G 7.1G 53% /media/KINGSTON Confirming what I reported. Anyone got a clue/answer to this issue? Thanks.

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  • How to monitor RAM usage for Hyper-V VMs ?

    - by Mac
    A bit of context first : on Windows 2008 Standard x64 with 8Gb RAM, I have 5 VMs running which should take up 1664Mb RAM (3*256Mb+384Mb+512Mb). There is nothing else running on this server except the basic OS components (this not a Core installation). I know that each VM will use more RAM on the host than what has been configured in Hyper-V. But when I run the task manager, it says 6.7Gb used ! If I sum up the RAM used by each process in the task manager (showing all users processes), I get to something around 1Gb... So : how can I check how much RAM each VM is really using on the host (it does not seem to be available via task manager) ? Note that I am aware of the fact that my problem could be unrelated to VM RAM usage, but I would still very much like to know how to do this.

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  • Looking for 'WinHlp32.exe compatible' replacement for free redistribution under vista and windows 7

    - by richardboon
    Our software installs a package of legacy software for the client, some of it has old hlp file from 3rd party vendor requiring winhlp32.exe (note: we have no legal right to modify the hlp). Those client may only have cd/dvd and might not have internet access, etc. So I need a free 'WinHlp32.exe compatible' replacement for our redistribution under vista and windows 7. Background of problem: -Microsoft stopped including the 32-bit Help file viewer in Windows releases beginning with Windows Vista and Windows Server 2008. -Starting with the release of Windows Vista and Windows Server 2008, third-party software developers are no longer authorized to redistribute WinHlp32.exe with their programs. http://support.microsoft.com/kb/917607

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  • Is there a Linux mail server with an outgoing pickup directory?

    - by Paul D'Ambra
    On my Exchange server I can drop appropriately formatted text files in the "pickup" directory and Exchange will process them. I'd like to split this bulk mailing functionality onto another box to protect our business mail IP from the bumpy ride that our monthly newsletter gives us. I should note at this point that the mailing is opt-in with an opt out link included and only goes to people who pay to be a member of our organisation The ideal solution for me would be to add a linux box to use just for this purpose so we're not paying for Exchange licenses. So is there a linux equivalent of the Exchange pickup directory?

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  • Is there a Linux mail server with an outgoing pickup directory?

    - by Paul D'Ambra
    On my Exchange server I can drop appropriately formatted text files in the "pickup" directory and Exchange will process them. I'd like to split this bulk mailing functionality onto another box to protect our business mail IP from the bumpy ride that our monthly newsletter gives us. I should note at this point that the mailing is opt-in with an opt out link included and only goes to people who pay to be a member of our organisation The ideal solution for me would be to add a linux box to use just for this purpose so we're not paying for Exchange licenses. So is there a linux equivalent of the Exchange pickup directory?

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  • jQuery - upgrade from version 1.6.x to 1.7

    - by Renso
    Goal: Issues to consider when upgrading from jQuery version 1.6 to 1.7. This is a short list and may help identify the real issues you need to concern yourself with in stead of reading through all the release notesSummary of issues encountered during upgrade:As you prepare for upgrade to jQuery 1.7 from 1.6.x, this is a quick glimpse of all the issues that are relevant, not sure if it covers all but may be all you need to worry about.Use this method only for checking checkboxes and radio buttons:$("input:checked")http://api.jquery.com/checked-selector/This will work regardless of the version of jQuery you are using. Note that $("input).attr("checked") returns true prior to jQuery 1.6. Only retrieve "real" attributes with "attr", in order versions it would also retrieve properties like "tagName", this no longer works with jQuery 1.6.1+Why does $("input").attr("checked") no longer (from version 1.6.1+) return TRUE or FALSE, because if you look at the HTML (as well as W3C spec) it does not contain a true/false, but the value checked="checked", which is what it should have returned in the first place. $("input").prop("checked") works, return true, because there is in fact a DOM property for "checked" with the value being "true" or "false".Furthermore, if you want to upgrade to jQuery 1.7 you should only have to worry about this for most part:1. isNumeric() is new, be careful as the older version jQuery.isNaN() has been deprecated2. jqXHR success and error have been deprecated3. When rendering content with text(), white space issue cross-browsers: http://bugs.jquery.com/ticket/3144Other than the issues above I am not aware of any deprecations you need to worry about.Hope this helps to get everyone up to version 1.7

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  • Can I extend my total RAM by buying more, and what kind do I need to buy

    - by Xeon06
    I currently have 4 GB total RAM and I would like to get some more, to bring it to a total of 8 GB. Is it possible to simply buy another 4 GB and bring it to 8? If so, what kind should I be buying? There is a lot of different possibilities, DDR3, DDR2, clock speed, etc. I am kind of lost among all this. My current setup goes like this: ACER EG43M mainboard Intel(R) Core(TM)2 Quad CPU Q8200 @ 2.33GHz 4 total RAM slots, 2 occupied by 2 GB sticks According to CPU-Z, my memory type is DDR3 (not sure how reliable that is) Full CPU-Z dump Windows 7 64-bit So basically, I want to know whether it's possible to extend my current RAM to get 8 GB total by buying another 4, and if so, what kind of RAM do I need? Note that I am not looking for shopping recommendations. I'm worried about the hardware compatibility.

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  • How do I get my XFX Radeon HD 7870 to work with 3 monitors using HDMI, DVI, and Mini DisplayPort?

    - by user88792
    I bought a XFX Double D FX-787A-CDFC Radeon HD 7870 and set it up using the HDMI, DVI and Mini DisplayPort (using an Apple mDP-to-VGA adapter). I hooked it up, installed the drivers and rebooted. The image came up on the third monitor in a weird resolution. Why did this happen and how can I fix it? I am using Windows 7 Ultimate and the system is completely updated. Side note: When I disconnect the Mini DisplayPort adapter it works fine, however for my work I need 3-4 monitors.

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  • List of Asus U46 laptop troubles with Ubuntu 12.04

    - by Cybertib
    I've bought my ASUS U46 last february. I would like to make it work better with Ubuntu 12.04. Note taht I was forced to install Ubuntu 12.04 (before its publication) by ethernet. After a successfull install, several problem remain unfixed such as : USB 3 just does not work correctly. Can be fixed, but I didn't succeed yet. Nvidia Optimus (means that you can use Intel Chipset or the Nvidia GeForce) is possible to use thanks to BumbleBee project. It seems to work, though. But Nvidia tools still say they don't see any Nvidia driver installed. Battery duration can be optimised by using Laptop-tools. Any standby state lead to a X server crash. A good CTRL+ALT+F1 login and "shutdown -r" avoids a brutal power off. And since few weeks, I have some bug reports right after boot about "unattended-upgrade", and dpkg troubles after any apt-get install or update (Linux kernel doesn't compile anymore), ... Are there any ways to fix those troubles ? I would need a bit of assistance, in fact. Thank you for you help, Sincerly yours, Thibault

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  • NFSv4 with idmap

    - by HTF
    The following errors appear on the NFS server, could you please advise how I can fix this? Details: System: CentOS release 6.4, NFS: nfs-utils-1.2.3-36 # cat /etc/idmapd.conf [General] Domain = domain.com [Mapping] Nobody-User = nobody Nobody-Group = nobody [Translation] Method = nsswitch Sep 3 08:25:28 snode1 rpc.idmapd[1382]: nss_getpwnam: name '0' does not map into domain 'domain.com' Sep 3 08:25:29 snode1 rpc.idmapd[1382]: nss_getpwnam: name '500' does not map into domain 'domain.com' EDIT: 03 Sep 2013 10:41 Please note that I'm using NFSv4 and these errors appear on NFS server only (not NFS clients). Server: # cat /etc/sysconfig/nfs MOUNTD_NFS_V2="no" MOUNTD_NFS_V3="no" ... RPCNFSDARGS="-N 2 -N 3" Clients: # cat /etc/fstab server:/ /data nfs4 defaults,hard,intr,timeo=15,_netdev,noatime,nodiratime,nosuid 0 0

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  • How to avoid being fooled

    - by Dacav
    I'm a big fan of the OpenSource development model, and I think that sharing information, knowledge and ideas is the best way of working in software development. Still I think that being hired for proprietary software development must not be demonized. Of course, as there's a no reward in terms of sharing there must be a bigger reward in terms of money (i.e. I surrender all my rights for cash). It may happen that one gets hired piecework, for a single project: in this case one is more vulnerable to dishonest employers. This didn't happen to me personally, but some friends of mine had bad experiences, and lost a lot of time without being fairly retributed. Of course a contract should protect both parts. But contracts can be very generic in the specification. Software is not anything but a palpable good! Besides I don't think that contracts can distinguish between a well written software and a poorly written one. Note also that, in this (nasty) spirit, it's also likely that the employer cannot trust the employee! So also the employer should be protected by a dishonest employee). My question is the following: Which is, in your opinion, a good way of avoiding this kind of situation from the technical perspective?

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  • SQL Server 2005 transactional replication break before a configured number of retries

    - by ti2
    We have a SQL Server 2000 Standard database with some tables being replicated (continuous transactional replication) to dozens of SQL Server 2005 Express and MSDE computers. The step 2 of the replication agent job (Run agent) is configured by default to retry every 1 minute for 10 times if some problem ocurr. Because the client machines get shut down at night (they are POS machines), we changed the number of retries to 5760 (4 days), so replication would not be broken at night and would not need to be restarted manually. But the problem is that every other day we have at least one machine with broken replication, with this error: The process could not connect to Subscriber 'POS986'. NOTE: The step was retried the requested number of times (5760) without succeeding. The step failed. It seems that SQL Server is not respecting the number of retries or the interval between retries as we configured. PS: I have restarted the replication job after changing the number of retries from 10 to 5760.

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  • Apache timeouts and error log

    - by BlackFire27
    I have an error whenever I run my code for a certain time. I use a lot of loops and sql connections. I basically, put and take out links from my database. The problem is that there is some error thrown that I cant see, whenever I execute a long sql operation .. Note that the fault isnt the code. The code runs well, whenever there are a few links involved. But when there are over 200 links.. an error is thrown that I cants see. I tried to trace the error in a few places: C:\Program Files\Zend\ZendServer\logs\php_error.log C:\Program Files\Zend\phpMyAdmin\config.inc.php Edit Viewer in win xp I am running XP: Windows xp php version: 5.3.9-ZS5.6.0. Apache/2.2.21 Apacher version: (Win32) mod_ssl/2.2.21 OpenSSL/0.9.8o I cant trace the error at all, and why it happens. All I can suspect of, is that there is a server timeout..

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  • Computer won't stay powered up

    - by Android
    I have just tried to turn my PC on this morning and it won't stay powered up. It will come on as normal for about 5 seconds, not quite long enough for the monitor to wake up. Then it will power off. After about 2 seconds it will start again, it will continue like this until I pull out the plug. Plugging it in again doesn't restart the cycle although pressing the power button does. I have tried to clear the cmos but beyond that I have no ideas. It was working perfectly when I put it in hibernate last night. NOTE: I am using a Dell Optiplex 755 UPDATE 1: I took out the motherboard battery and it almost came on then it displays the message Error loading Operating System UPDATE 2: After taking out the custom video card, it says "No hard drive present"

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  • Use server git installation in GitHub for Windows

    - by Lg102
    We are using Git as the version control for our website development. I work from a laptop, which is connected to the internal network via a WiFi connection. I've mapped the server drives as network drives in Windows. Commands such as git status take significantly longer for me than they do for my co-workers on wired connections. When connecting to the server using SSH and running commands on the git installation there, performance is even better. Is there a way to configure GitHub for Windows to use the server-installed git (with my credentials)? Note: While our production servers has a user configuration with proper permissions, the development server has only one root user.

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  • Lost all non-linux hard drives

    - by Rick
    I've somehow lost access to all my non-linux drives. I'm not sure how. I have two other hard drives set up (a windows boot and an external usb I was using under windowsxp). A few days ago I could access both under linux with no problem. Now, I see them listed under media, but when I click on them, nothing is there (same thing happens when I go there in a term window). Now, the computer (under linux) sees them, but I can't see anything in them. (in nautilus it shows "(Empty)") Any ideas what happened or how to get access to them again? My guesses as to what might have caused it: -I was trying to set up AdobeAIR (unsuccessfully) and had to make and remove a couple of symbolic links. Never got that to work but maybe links I made or removed did something? -I was also trying to set up nautilus so that I could enter it with sudo permission. I also didn't figure out how to do that successfully, but maybe something I did while trying messed it up? (I think I installed and uninstalled nautilus-actions configuration tool). Note: I'm working on a relatively new install of 12.04

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  • MOD_REWRITE not creating correct path

    - by Bill
    SO I am trying to setup a RewriteRule on my server for caching static objects. the files are in this naming scheme /docroot/css/stylesheet.min.css and I have them printed in the code like /docroot/css/stylesheet.min.123438348.css (the number is example it comes from a get modified function). Note docroot is an example directory how can I have the server ignore the numbers and redirect to the stylesheet.min.css I need to do this for every css and js files (/js and /css) as well as one specific spritemap image my current attempt RewriteRule ^/(docroot)/(js|css)/(.+).(min).(.+).(js|css)$ /$1/$2/$3.$4.$6 RewriteRule ^(/docroot/images/spritemap).([0-9]+).(png)$ $1.$3 Update: Now I have the setup like this RewriteEngine on Options FollowSymLinks RewriteRule ^(.+).(min).([0-9]+).(js|css)$ $1.$2.$4 [L] This is rewriting localhost/docroot/css/stylesheet.min.12343242.css to /var/www/html/docroot/trunk/docroot/css/stylesheet.min.css so it is getting the right file how do I get apache to take off the beginning of the that the /var/www/html/docroot/trunk/

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  • Dependency Injection: where to store dependencies used by only one method?

    - by simoneL
    I developing a project integrated with Dependency Injection (just for reference, I'm using Unity). The problem is that I have some Manager classes with several methods and in many cases I have dependencies used only in one method. public class UserManager : IUserManager { private UserRepository UserRepository {get;set;} private TeamRepository TeamRepository {get;set;} private CacheRepository CacheRepository {get;set;} private WorkgroupRepository WorkgroupRepository {get;set;} public UserManager(UserRepository userRepository, TeamRepository teamRepository, CacheRepository cacheRepository , WorkgroupRepository workgroupRepository, ... // Many other dependencies ) { UserRepository = userRepository; TeamRepository = teamRepository; CacheRepository = cacheRepository ; WorkgroupRepository = workgroupRepository; ... // Setting the remaining dependencies } public void GetLatestUser(){ // Uses only UserRepository } public void GetUsersByTeam(int teamID){ // Uses only TeamRepository } public void GetUserHistory(){ // Uses only CacheRepository } public void GetUsersByWorkgroup(int workgroupID){ // Uses only workgroupRepository } } The UserManager is instantiated in this way: DependencyFactory<IUserManager>(); Note: DependencyFactory is just a wrapper to simplify the access to the UnityContainer Is it OK to have classes like that in the example? Is there a better way to implement avoiding to instantiate all the unnecessary dependencies?

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