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  • How do private BitTorrent trackers monitor how much users upload/download?

    - by Jon-Eric
    From Wikipedia: Most private trackers monitor how much users upload or download, and in most situations, enforce a minimum upload-to-download ratio. How exactly can a tracker figure out how much data was uploaded and downloaded by each user? My understanding is that a BitTorrent tracker is merely a registry of users that are currently downloading/seeding and that peers, once connected, transfer data directly. So I wouldn't think that the tracker would know anything about the amount of data transferred, much less, where it came from.

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  • How do I layout a form in WPF using grid or other controls for maintainability

    - by Jason Coyne
    I have a WPF form, I want to lay out a standard form onto it. Each form element will have a label, and then a control. Pretty standard stuff. If I use a wrap panel, it can cause the label and the control to be separated, but I want them to stay together. is there some WPF equivalent of nobr? Grid works, and allows for column spanning etc, however I really really hate that you specify the column and row on each control. This makes it extremely inconvenient to reorder or insert things into the list. Is there a way to get the grid to use more HTML style column/rows where the items are a child of the row they are in, so that I can re-order easily? Is there some other control that will let me layout a form easily?

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  • Tab versus space indentation in C#

    - by Lars Fastrup
    I sometimes find myself discussing this issue with other C# developers and especially if we use different styles. I can see the advantage of tab indentation allowing different developers to browse the code with their favorite indent size. Nonetheless, I long ago went for two space indentation in my C# code and have stuck with it ever since. Mainly because I often disliked the way statements spanning multiple lines are sometimes messed up when viewing code from other developers using another tab size. Recently a developer at one of my clients approached me and asked why I did not use tabs because he preferred to view code with an indentation size of 4. So my question is: Which style do you prefer and why?

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  • Do I still need to send the "Expires" header, or can I assume that web caches understand "Cache-Cont

    - by chris_l
    I want to reduce the overhead caused by HTTP headers to a minimum, so I'd like to avoid the "Expires" header, and use "Cache-Control" only - or maybe the other way around (I'm planning to send very short HTTP responses to browsers, so the answer to this question doesn't fully apply here: My headers account for a significant percentage). AFAIK, the "Cache-Control" header was standardized in HTTP 1.1, but are there still web caches/proxies, that don't understand it? Note: This is a sub-question to my stackoverflow (bounty) question

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  • Why does my performance slow to a crawl I move methods into a base class?

    - by Juliet
    I'm writing different implementations of immutable binary trees in C#, and I wanted my trees to inherit some common methods from a base class. However, I find. I have lots of binary tree data structures to implement, and I wanted move some common methods into in a base binary tree class. Unfortunately, classes which derive from the base class are abysmally slow. Non-derived classes perform adequately. Here are two nearly identical implementations of an AVL tree to demonstrate: AvlTree: http://pastebin.com/V4WWUAyT DerivedAvlTree: http://pastebin.com/PussQDmN The two trees have the exact same code, but I've moved the DerivedAvlTree.Insert method in base class. Here's a test app: using System; using System.Collections.Generic; using System.Diagnostics; using System.Linq; using Juliet.Collections.Immutable; namespace ConsoleApplication1 { class Program { const int VALUE_COUNT = 5000; static void Main(string[] args) { var avlTreeTimes = TimeIt(TestAvlTree); var derivedAvlTreeTimes = TimeIt(TestDerivedAvlTree); Console.WriteLine("avlTreeTimes: {0}, derivedAvlTreeTimes: {1}", avlTreeTimes, derivedAvlTreeTimes); } static double TimeIt(Func<int, int> f) { var seeds = new int[] { 314159265, 271828183, 231406926, 141421356, 161803399, 266514414, 15485867, 122949829, 198491329, 42 }; var times = new List<double>(); foreach (int seed in seeds) { var sw = Stopwatch.StartNew(); f(seed); sw.Stop(); times.Add(sw.Elapsed.TotalMilliseconds); } // throwing away top and bottom results times.Sort(); times.RemoveAt(0); times.RemoveAt(times.Count - 1); return times.Average(); } static int TestAvlTree(int seed) { var rnd = new System.Random(seed); var avlTree = AvlTree<double>.Create((x, y) => x.CompareTo(y)); for (int i = 0; i < VALUE_COUNT; i++) { avlTree = avlTree.Insert(rnd.NextDouble()); } return avlTree.Count; } static int TestDerivedAvlTree(int seed) { var rnd = new System.Random(seed); var avlTree2 = DerivedAvlTree<double>.Create((x, y) => x.CompareTo(y)); for (int i = 0; i < VALUE_COUNT; i++) { avlTree2 = avlTree2.Insert(rnd.NextDouble()); } return avlTree2.Count; } } } AvlTree: inserts 5000 items in 121 ms DerivedAvlTree: inserts 5000 items in 2182 ms My profiler indicates that the program spends an inordinate amount of time in BaseBinaryTree.Insert. Anyone whose interested can see the EQATEC log file I've created with the code above (you'll need EQATEC profiler to make sense of file). I really want to use a common base class for all of my binary trees, but I can't do that if performance will suffer. What causes my DerivedAvlTree to perform so badly, and what can I do to fix it?

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  • how to get rid of certificate error: navigation blocked in ie8

    - by Radek
    when I access our intranet via https I get this "certificate error: navigation blocked" error in IE8 on Windows XP SP3. I can click Continue to this website (not recommended). but I use IE for automation testing so I have to avoid these extra clicks. Any idea? I tried setting “Turn off the Security Settings Check feature” to enabled. setting "Display Mixed Content" to enabled lowering security levels to minimum adding the web server address to trusted zone

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  • Verizon FiOS Speed concerns

    - by Josh K
    I'm working on getting a separate internet connection to run out and I was looking into available options. FiOS claims to offer 25Mb up / 25 Mb down as a maximum rate. Do they have listed minimum rates? Is there anything with fiber I should be concerned about? Special hardware, special routers, availability concerns?

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  • How to determine where debian package was sourced

    - by user169309
    How would I trace out which archive(s) in the sources.list a given installed deb package was or (could be) sourced from? I understand that the same package may be indexed by multiple archives. Does "aptitude" log any of this type of information when its installing packages? My aim is to pare down my current sources.list to the minimum set of archives needed to maintain the current set of installed packages.

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  • how to optimize apache on web-server

    - by Prakash
    how can I optimize the server with following configuration. It takes too much time to load a page. IBM X3200 M3 Server - 1 Intel Xeon Processor with 4 GB Ram Below is my current configuration for apache: Start Servers: 5 (Default) Minimum Spare Servers: 10 Maximum Spare Servers: 20 Server Limit: 500 Max Clients: 500 Max Requests Per Child: 10000 (Default) Keep-Alive: On Keep-Alive Timeout: 5 Max Keep-Alive Requests: 100 Timeout: 200

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  • Opinions on platform game actor/background collision resolving

    - by Kawa
    Imagine the following scenario: I have a level whose physical structure is built up from a collection of bounding rectangles, combined with prerendered bitmap backgrounds. My actors, including the player character, all have their own bounding rectangle. If an actor manages to get stuck inside a level block, partially or otherwise, it'll need to be shifted out again, so that it is flush against the block. The untested technique I thought up during bio break is as follows: If an actor's box is found to intersect a level box, determine where the centerpoints of each rect are. If the actor's center is higher than the level box's, move the actor so that the bottom of the actor's rect is flush with the top of the level's rect, and vice versa if it's lower. Then do a similar thing horizontally. Opinions on that? Suggestions on better methods? Actually, the bounding rects are XNA BoundingBlocks with their Z spanning from -1 to 1, but it's still 2D gameplay.

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  • ASP.net Treeview/Listview combination or alternative: Tutorials? Help?

    - by jlrolin
    I need to create an ASP.net page that has a control on the page that has a five-level TreeView on the left side of the page, and accounting balances on the right side the coincide with each breakdown in the tree. Top level is company, next is group, next is program, etc... and the balances break down accordingly. I've seen that there are controls out there such as TreeView/ListView combination controls that can do this. Is there any tutorials or help out there on how to go about accomplishing this without paying for controls? Could a treeview do this alone by spanning data across the entire length of the columns since every level will have totals on it?

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  • Reach self hosted server from LAN

    - by Freefri
    I have a self hosted server with Apache2 pointed with the domain example.com. I have also some virtual servers www.example.com, cloud.examle.com, etc. This server is in my LAN, and when I try to acces to my server within the lan throw www.examle.com y get my router's configuration page. From outside the LAN www.example.com and cloud.examle.com works properly. From inside the LAN 192.168.1.33 (server internal IP) shows the default webpage (www.examle.com), but I can not get cloud.examle.com I also have a LAN name server in 192.168.1.33 with bind9. I set up my gateway 192.168.1.1 with my LAN-NS as primary NS I solve this problem creating a new dns zone in the NS. This are my config files: ;ZONE-1 $ORIGIN . $TTL 86400 ; 1 day home.lan. IN SOA server.home.lan. hostmaster.home.lan. ( 2008080901 ; serial 8H ; refresh 4H ; retry 4W ; expire 1D ; minimum ) home.lan. IN NS server.home.lan. $ORIGIN home.lan. ; Set the address for localhost.home.lan localhost IN A 127.0.0.1 router IN A 192.168.1.1 server IN A 192.168.1.33 mypc IN A 192.168.1.132 ;ZONE-2 $ORIGIN . $TTL 86400 ; 1 day example.com. IN SOA www.example.com hostmaster.home.lan. ( 2008080902 ; serial 8H ; refresh 4H ; retry 4W ; expire 1D ; minimum ) example.com. IN NS 192.168.1.33 $ORIGIN examle.com. localhost IN A 127.0.0.1 www IN A 192.168.1.33 cloud IN A 192.168.1.33 My DNS and my names are working properly now My question are: What do you think about my solution? Can I change the A zone with CNAME to server.home.lan (this is the domain in the LAN to the server)? How can I set a default IP for all my whatever.example.com?

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  • PES 2012 results in a Nvidia error on Dell N5110 regarding System Requirements?

    - by ???? ???????
    I bought laptop Dell N5110 and installed PES 2012. Nvidia graphics card has 1GB RAM, but when I try to run game message appears that there is just 128MB graphics memory. Here is the message: Warning :Your computer does not meet the Minimum System Requirements to run this software.As a result, you may experience errors during operation.Your Video Card does not meet the required specifications.(GPU:VRAM 128MB) What could be the problem?

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  • "Can't Connect to Server" from 2nd virtual host on VPS

    - by chaoskreator
    I'm using Debian 7 Wheezy and Apache 2.2.22, and I'm setting up Virtual Hosts for a number of websites on my VPS. I've successfully configured the VirtualHost directives for one of the sites, but the second one continually gives "Problem Loading Page" in Firefox. I've run configtest and it has verified all my syntax is correct, and I've checked all the permissions. Everything on the 2nd domain is pretty much copy/pasted from the first, so I'm not sure what the issue is, as there are no entries into /var/log/apache2/error.log other than where I have reloaded the configurations: /# cat /var/log/apache2/error.log [Thu May 29 01:19:00 2014] [notice] Graceful restart requested, doing restart [Thu May 29 01:19:00 2014] [info] Init: Seeding PRNG with 656 bytes of entropy [Thu May 29 01:19:00 2014] [info] Init: Generating temporary RSA private keys (512/1024 bits) [Thu May 29 01:19:00 2014] [info] Init: Generating temporary DH parameters (512/1024 bits) [Thu May 29 01:19:00 2014] [debug] ssl_scache_shmcb.c(253): shmcb_init allocated 512000 bytes of shared memory [Thu May 29 01:19:00 2014] [debug] ssl_scache_shmcb.c(272): for 511920 bytes (512000 including header), recommending 32 subcaches, 133 indexes each [Thu May 29 01:19:00 2014] [debug] ssl_scache_shmcb.c(306): shmcb_init_memory choices follow [Thu May 29 01:19:00 2014] [debug] ssl_scache_shmcb.c(308): subcache_num = 32 [Thu May 29 01:19:00 2014] [debug] ssl_scache_shmcb.c(310): subcache_size = 15992 [Thu May 29 01:19:00 2014] [debug] ssl_scache_shmcb.c(312): subcache_data_offset = 3208 [Thu May 29 01:19:00 2014] [debug] ssl_scache_shmcb.c(314): subcache_data_size = 12784 [Thu May 29 01:19:00 2014] [debug] ssl_scache_shmcb.c(316): index_num = 133 [Thu May 29 01:19:00 2014] [info] Shared memory session cache initialised [Thu May 29 01:19:00 2014] [info] Init: Initializing (virtual) servers for SSL [Thu May 29 01:19:00 2014] [info] mod_ssl/2.2.22 compiled against Server: Apache/2.2.22, Library: OpenSSL/1.0.1e [Thu May 29 01:19:00 2014] [notice] Apache/2.2.22 (Debian) PHP/5.4.4-14+deb7u9 mod_ssl/2.2.22 OpenSSL/1.0.1e mod_perl/2.0.7 Perl/v5.14.2 configured -- resuming normal operations [Thu May 29 01:19:00 2014] [info] Server built: Mar 4 2013 22:05:16 [Thu May 29 01:19:00 2014] [debug] prefork.c(1023): AcceptMutex: sysvsem (default: sysvsem) I've ensured to enable each vhost with a2ensite {sitename.conf} with no errors there, either. Below are the contents of the configuration files... /etc/apache2/apache2.conf # Global configuration # LockFile ${APACHE_LOCK_DIR}/accept.lock PidFile ${APACHE_PID_FILE} Timeout 300 KeepAlive On MaxKeepAliveRequests 100 KeepAliveTimeout 5 ## ## Server-Pool Size Regulation (MPM specific) ## # prefork MPM # StartServers: number of server processes to start # MinSpareServers: minimum number of server processes which are kept spare # MaxSpareServers: maximum number of server processes which are kept spare # MaxClients: maximum number of server processes allowed to start # MaxRequestsPerChild: maximum number of requests a server process serves <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 10 MaxClients 150 MaxRequestsPerChild 0 </IfModule> # worker MPM # StartServers: initial number of server processes to start # MinSpareThreads: minimum number of worker threads which are kept spare # MaxSpareThreads: maximum number of worker threads which are kept spare # ThreadLimit: ThreadsPerChild can be changed to this maximum value during a # graceful restart. ThreadLimit can only be changed by stopping # and starting Apache. # ThreadsPerChild: constant number of worker threads in each server process # MaxClients: maximum number of simultaneous client connections # MaxRequestsPerChild: maximum number of requests a server process serves <IfModule mpm_worker_module> StartServers 2 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxClients 150 MaxRequestsPerChild 0 </IfModule> # event MPM # StartServers: initial number of server processes to start # MinSpareThreads: minimum number of worker threads which are kept spare # MaxSpareThreads: maximum number of worker threads which are kept spare # ThreadsPerChild: constant number of worker threads in each server process # MaxClients: maximum number of simultaneous client connections # MaxRequestsPerChild: maximum number of requests a server process serves <IfModule mpm_event_module> StartServers 2 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxClients 150 MaxRequestsPerChild 0 </IfModule> # These need to be set in /etc/apache2/envvars User ${APACHE_RUN_USER} Group ${APACHE_RUN_GROUP} # # AccessFileName: The name of the file to look for in each directory # for additional configuration directives. See also the AllowOverride # directive. # AccessFileName .htaccess # # The following lines prevent .htaccess and .htpasswd files from being # viewed by Web clients. # <Files ~ "^\.ht"> Order allow,deny Deny from all Satisfy all </Files> DefaultType None HostnameLookups Off ErrorLog ${APACHE_LOG_DIR}/error.log LogLevel debug # Include module configuration: Include mods-enabled/*.load Include mods-enabled/*.conf # Include list of ports to listen on and which to use for name based vhosts Include ports.conf # # The following directives define some format nicknames for use with # a CustomLog directive (see below). # If you are behind a reverse proxy, you might want to change %h into %{X-Forwarded-For}i # # LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined LogFormat "%h %l %u %t \"%r\" %>s %O" common LogFormat "%{Referer}i -> %U" referer LogFormat "%{User-agent}i" agent <Directory "/var/www"> Order allow,deny Allow from all Require all granted </Directory> # Include generic snippets of statements Include conf.d/ # Include the virtual host configurations: Include sites-enabled/*.conf NameVirtualHost *:80 /etc/apache2/sites-available/site1.net.conf <VirtualHost *:80> ServerName site1.net ServerAlias site1.net *.site1.net DocumentRoot "/var/www/site1" ErrorLog "/var/www/site1/logs/error.log" CustomLog "/var/www/site1/logs/access.log" vhost_combined <Directory "/var/www/site1"> Options None AllowOverride All Order allow,deny Allow from all Satisfy Any </Directory> </VirtualHost> /etc/apache2/sites-available/site2.com.conf <VirtualHost *:80> ServerName site2.com ServerAlias site2.com *.site2.com DocumentRoot "/var/www/site2" ErrorLog "/var/www/site2/logs/error.log" CustomLog "/var/www/site2/logs/access.log" vhost_combined <Directory "/var/www/site2"> Options None AllowOverride All Order allow,deny Allow from all Satisfy Any </Directory> </VirtualHost> I've also tried setting NameVirtualHost like: Listen 80 NameVirtualHost 23.88.121.82:80 NameVirtualHost 127.0.0.1:80 and the VirtualHost Directives: <VirtualHost 23.88.121.82:80> ... </VirtualHost> for both sites, but that causes the first site to fail, as well. I'm wondering if I need to set up individual IPs for each site, possibly? I have 2 more IPv4 and 3 IPv6 addresses available, if that would make a difference. Also, in the grand scheme of things, I will need to enable SSL for the first site. I've been reading that I'll need to basically just mimic the directives for listening on port 80, only on port 443, and make sure mod_ssl is enabled? EDIT: I just ran apache2 -t to test the config files that way, and got the error: apache2: bad user name ${APACHE_RUN_USER}. However, apachectl configtest returns Syntax OK. There are no other mentions of errors with the mutex anywhere else, however. I was pretty sure if there was an error with the user apache was supposed to run under, the server wouldn't start at all... EDIT 2: Restarting apache fixed the bad user name error.

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  • Setting 0 margin in header using LaTeX's fancyhdr

    - by Morten
    Hi, I'm trying to define a custom layout for my report for which I'm using fancyhdr. On the pages which contains a chapter start I want my header to contain a colorbox spanning across the whole page (0 cm margins) although keeping my defaults margin in the text area. I can get the box to span across the "margin notes" area, but not the other side. Here's some of my code: \fancypagestyle{plain}{ % pages containing chapter start \fancyhead{} \fancyhead[RO]{\colorbox{NavyBlue}{\textcolor{White}{\raisebox{0cm}[1cm][0.5cm]{\makebox[3cm][c]{\textbf{\CNoV\thechapter}}}}} } Any ideas on how to do it?

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  • Is there a Linux distro specific for running as a host OS for Virtualization?

    - by harmh
    Hi, as I understand running VMware or other virtualizations requires a "host os". Normally this is one of your main os-es, that you really use. What I would like is a mini-linux and virtualization software pre-wrapped into a specialized bootalble, installable mini-os. So the linux would not have a webserver, nor X, just the minimum to run as a host OS and of course optimized for that, like some partitioning tools and such.

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  • Rule of thumb in RAM estimate for static pages? [closed]

    - by IMB
    Possible Duplicate: How do you do Load Testing and Capacity Planning for Web Sites I've seen tutorials saying they can run decent websites on 64MB RAM (Debian/Lighttpd/PHP/MySQL) however it's not clearly defined how much hits/traffic a "decent" site gets. Is there a rule of thumb on how much RAM a web server needs? To keep things simple, let's say you're running a site with static content and it's averaging at 100,000 hits per hour (HTML + images combined, no MySQL). How much RAM is the minimum requirement for that?

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  • How to preserve file attributes when one copies files in Windows?

    - by netvope
    On Linux, we can simply do: cp -pr directory How to do that in Windows? Can it be done in Windows Explorer? Any GUI tool suggestions? It would be the best if I can keep the NTFS permissions and creation/modification/access time. At a minimum, I need to preserve the modification date for the files and the directories. Windows Explorer's copy does not preserve the modification date for directories.

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  • What are the Best Virtual Desktop Managers for Windows 7 excluding Dexpot? [closed]

    - by user233641
    My question is different to others as my list of important features is completely different and I believe unique. Necessary Features Are: Dual-monitor support 6 desktops minimum Different icons can be created on different desktops Reliable and does not delete or remove icons without input from me Ability to save profiles and reload them if necessary Ability to change the home desktop to a different one Reasonably easy to use Keyboard Support Good email support

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  • Decreasing cached memory and increasing Free memory in RAM

    - by Greenhorn
    Hi, Im using windows 2007 server 64 bit OS, I've uploaded the snap shot of my task manager when minimum processes running It shows Total memory 8190 mb *Cached memory 4315 mb* Free 3402 mb So effectively I get only 3402 mb of total RAM usage My question here is more than half is used for cached memory is there any means I can decrease this cached memory inturn I can increase my free memory. I need to do this because my Application requires at least 5GB RAM and it crashed when run in this system. Please give me a solution for this Thanks in advance

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  • i need help to designe code in c++

    - by user344987
    ) Design and implement a Graph data structure. Use adjacency matrix to implement the unweighted graph edges. The Graph must support the following operations: 1.Constructor 2.Destructor 3.Copy constructor 4.A function to add an edge between two nodes in the graph 5.A display function that outputs all the edges of the graph 6.A function edge that accepts two nodes, the function returns true if there is an edge between the passed nodes, and returns false otherwise. B.(100 points) Depth first search and Breadth first search functions. C.(100 points) A function to output a spanning tree of the graph, use any algorithm you find appropriate, also, make the necessary changes on the data structure in A to implement your algorithm.

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