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• How to represent a graph with multiple edges allowed between nodes and edges that can selectively disappear

  - by Pops

  I'm trying to figure out what sort of data structure to use for modeling some hypothetical, idealized network usage. In my scenario, a number of users who are hostile to each other are all trying to form networks of computers where all potential connections are known. The computers that one user needs to connect may not be the same as the ones another user needs to connect, though; user 1 might need to connect computers A, B and D while user 2 might need to connect computers B, C and E. Image generated with the help of NCTM Graph Creator I think the core of this is going to be an undirected cyclic graph, with nodes representing computers and edges representing Ethernet cables. However, due to the nature of the scenario, there are a few uncommon features that rule out adjacency lists and adjacency matrices (at least, without non-trivial modifications): edges can become restricted-use; that is, if one user acquires a given network connection, no other user may use that connection in the example, the green user cannot possibly connect to computer A, but the red user has connected B to E despite not having a direct link between them in some cases, a given pair of nodes will be connected by more than one edge in the example, there are two independent cables running from D to E, so the green and blue users were both able to connect those machines directly; however, red can no longer make such a connection if two computers are connected by more than one cable, each user may own no more than one of those cables I'll need to do several operations on this graph, such as: determining whether any particular pair of computers is connected for a given user identifying the optimal path for a given user to connect target computers identifying the highest-latency computer connection for a given user (i.e. longest path without branching) My first thought was to simply create a collection of all of the edges, but that's terrible for searching. The best thing I can think to do now is to modify an adjacency list so that each item in the list contains not only the edge length but also its cost and current owner. Is this a sensible approach? Assuming space is not a concern, would it be reasonable to create multiple copies of the graph (one for each user) rather than a single graph?

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• How do I purge or empty Windows Explorer's network username and sharename cache?

  - by Abel

  While troubleshooting a Samba vs Windows Network issue, I noticed that Windows' Explorer remembers login credentials of remote shares, even if you ask it not to. For instance, after accessing a share using \\servername\sharename plus entering username/password and then closing Windows Explorer, adding the same share as a network drive gives the following message, regardless whether the username is the same or not: The network folder specified is currently mapped using a different user name and password. To connect using a different user name and password, first disconnect any existing mappings to this network share. Using NET USE does not show the share. After restarting the computer, I have no problems accessing the share using different credentials. But restarting just for testing other credentials is annoying, esp. while troubleshooting. How can I purge this cache, using Windows Vista? Note: using nbtstat -R[R], ipconfig /renew, killing explorer.exe or disabling / re-enabling the network card didn't help.

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• Is using a dedicated thread just for sending gpu commands a good idea?

  - by tigrou

  The most basic game loop is like this : while(1) { update(); draw(); swapbuffers(); } This is very simple but have a problem : some drawing commands can be blocking and cpu will wait while he could do other things (like processing next update() call). Another possible solution i have in mind would be to use two threads : one for updating and preparing commands to be sent to gpu, and one for sending these commands to the gpu : //first thread while(1) { update(); render(); // use gamestate to generate all needed triangles and commands for gpu // put them in a buffer, no command is send to gpu // two buffers will be used, see below pulse(); //signal the other thread data is ready } //second thread while(1) { wait(); // wait for second thread for data to come send_data_togpu(); // send prepared commands from buffer to graphic card swapbuffers(); } also : two buffers would be used, so one buffer could be filled with gpu commands while the other would be processed by gpu. Do you thing such a solution would be effective ? What would be advantages and disadvantages of such a solution (especially against a simpler solution (eg : single threaded with triple buffering enabled) ?

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• What's the difference between a normal ActiveX killbit update and one for IDX?

  - by Bob

  I'm looking back at some old MS security bulletin for distribution to new clients and when I look at downloads for the last set of MS ActiveX killbits, KB article here, under each platform I see links with the term IDX. For instance there will be an entry that says "For Windows 7 for 32-bit versions" and then one a few rows down that says "For Windows 7 IDX for 32-bit versions". What's the difference between the two? I understand from a little digging that idx is one of the field names for the database that ActiveX controls are stored in, but that's not really helpful.

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• How can I choose a Webapp UI Design/dev collaborative tool?

  - by Cheeso

  I am working with a team that's building a webapp for internal use in an enterprise. It's basically a workflow app at heart, where there's a single "request". Each request flows through various stages, and at each stage, there's a person or role that is responsible for moving the request to the next stage. "Moving" the request to the next stage might involve adding more data, validating things, gathering input from some external source and correlating it to the data in the request, and so on. The workflow engine has been selected. The UI for the various roles and stakeholders is being designed. We have a distributed group of stakeholders. I'd like to employ a collaborative design/dev effort, where devs can produce and stand-up mockups or even working prototypes, then solicit feedback on those things. In a centralized team this could be done via design review meetings, with everyone gathered round a screen projector. That just is not going to work for us. So what I'd like is an app that can help with this. Any recommendations on apps or how to choose?

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• Windows Server 2003 guest on Xen frequently stops responding

  - by smokris

  I'm running a Windows Server 2003 guest instance in Xen 3.x. This DomU runs fine for a day or two, then stops responding — I don't get any network response, and I can no longer connect to Xen's VNC console for this DomU. xm list shows this: Name ID Mem VCPUs State Time(s) Domain-0 0 6508 8 r----- 1161159.4 [A working Linux DomU] 1 512 1 -b---- 68711.1 [The hung Windows DomU] 5 512 1 ------ 67234.2 [Another working Linux DomU] 3 512 1 -b---- 163036.4 (What does the ------ mean? The xm manual explains what each of the six states mean, but not what no-state means.) If I xm destroy and then xm create the Windows DomU again, it boots right back up (with the Windows alert The previous system shutdown at [...] was unexpected.), and then stops responding after another day or two. I checked /var/log/xen/*.log, but no log messages are generated at the time the server stops responding. How should I proceed in troubleshooting this?

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• best way to send messages to all subscribers with multiple subscriptions and multiple providers

  - by coding_idiot

  I'm writing an application in which - Many users can subsribe to posts made by another users. So for a single publisher there can be many subscribers. When a message is posted by an user X, all users who have subscribed to messages of User X will be sent an email. How to achieve this ? I'm thinking of using publish-subscribe pattern. And then I came through JMS. Which is the best JMS implementation to use according to your experience ? Or else what else solution do you propose to the given problem ? Shall I go for a straight-forward solution ?: User x posts a message, I find all users (from database) who subscribe to user x and then for every user, I call the sendEmail() method. [EDIT] My intention here is not to send-emails. I'm really sorry if it wasn't clear. I also have to send kind of system-notifications apart from Email to all subscribers. Right now, I've implemented the email-sending as a threadPool

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• Using 4 monitors with 2 generic video cards... possible?

  - by Ikram

  I'm thinking of setting up 4 monitors in a grid, using two video cards, one card to feed each pair of monitors through the card's two DVI ports. The most important requirement for me is to have the grid of monitors act as one single huge screen. Is this scenario possible by using two generic cards like Radeon 4870s on a Windows 7 computer? (I've heard of Eyefinity, but 4870s don't have it) Another issue is that I only have one PCI-Express slot on my computer's motherboard, therefore I'll need to use one of the lesser PCI cards as the second video card. Will this pose problems?

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• How do I delete an Outlook calendar entry (after the meeting is over) without notifying the creator

  - by JabberwockyDecompiler

  I have several meetings during the day and I like to be able to open my calendar and see what is left at a glance so I delete the meetings that I have already completed. If I do this close enough to the meeting time I am asked if I want to notify the creator. If I do this after the meeting has started Outlook automatically sends a notice to the creator that I have declined the meeting. I am only deleting the one instance so it is still in my calendar for the next time, however that creates an email that others must read/delete. I need to be able to remove single occurrences of meetings without automatically sending a notice that I am deleting the entry. NOTE: I am using Outlook 2007, I did not see anything in the Advanced Email Options. NOTE 2: I have seen this happen with Lotus notes as well (Like anyone actually uses that). NOTE 3: There is not a sent message created, only the creator of the calendar event will see the message.

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• Caching DNS server (bind9.2) CPU usage is so so so high

  - by Gk.

  I have a caching-only dns server which get ~3k queries per second. Here is specs: Xeon dual-core 2,8GHz 4GB of RAM Centos 5x (kernel 2.6.18-164.15.1.el5PAE) bind 9.4.2 rndc status: recursive clients: 666/4900/5000 About 300 new queries (not in cache) per second. Bind always uses 100% on one core on single-thread config. After I recompiled it to multi-thread, it uses nearly 200% on two core :( No iowait, only sys and user. I searched around but didn't see any info about how bind use CPU. Why does it become bottleneck? One more thing, here is RAM usage: cat /proc/meminfo MemTotal: 4147876 kB MemFree: 1863972 kB Buffers: 143632 kB Cached: 372792 kB SwapCached: 0 kB Active: 1916804 kB Inactive: 276056 kB I've set max-cache-size to 0 to make sure bind can use as much RAM as it want, but it always stop at ~2GB. Since every second we got not cached queries so theoretically RAM must be exhausted but it wasn't. Do you have any idea? TIA, -Gk

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• How can I read a portion of one Minecraft world file and write it into another?

  - by RapierMother

  I'm looking to read block data from one Minecraft world and write the data into certain places in another. I have a Minecraft world, let's say "TemplateWorld", and a 2D list of Point objects. I'm developing an application that should use the x and y values of these Points as x and z reference coordinates from which to read constant-sized areas of blocks from the TemplateWorld. It should then write these blocks into another Minecraft world at constant y coordinates, with x & z coordinates determined based on each Point's index in the 2D list. The issue is that, while I've found a decent amount of information online regarding Minecraft world formats, I haven't found what I really need: more of a breakdown by hex address of where/what everything is. For example, I could have the TemplateWorld actually be a .schematic file rather than a world; I just need to be able to read the bytes of the file, know that the actual block data starts always at a certain address (or after a certain instance of FF, etc.), and how it's stored. Once I know that, it's easy as pie to just read the bytes and store them.

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• Embedded Tomcat Cluster

  - by ThreaT

  Can someone please explain with an example how an Embedded Tomcat Cluster works. Would a load balancer be necessary? Since we're using embedded tomcat, how would two separate jar files (each a standalone web application with their own embedded tomcat instance) know where eachother are and let eachother know their status, etc? Here is the code I have so far which is just a regular embedded tomcat without any clustering: import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.File; import java.io.IOException; import java.io.Writer; public class Main { public static void main(String[] args) throws LifecycleException, InterruptedException, ServletException { Tomcat tomcat = new Tomcat(); tomcat.setPort(8080); Context ctx = tomcat.addContext("/", new File(".").getAbsolutePath()); Tomcat.addServlet(ctx, "hello", new HttpServlet() { protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { Writer w = resp.getWriter(); w.write("Hello, World!"); w.flush(); } }); ctx.addServletMapping("/*", "hello"); tomcat.start(); tomcat.getServer().await(); } } Source: java dzone

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• How to block/redirect hosts and subdomains of a host using htaccess?

  - by Sven

  I want to block several host-domains and their subdomains, as well as IP-Adresses using htaccess. So far I added to my .htaccess-file: # block doamins and all subdomains Deny from .example.org # block domainrange: 1.2.3.[1-255] Deny from 1.2.3. # Block single IP Deny from 2.3.4.5 but still I had problems with spam from e.g. server1.example.org. What is wrong with my script? Is it also possible to redirect all requests from certain hosts/IPs to a document (say: info.html)?

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• Is version history really sacred or is it better to rebase?

  - by dukeofgaming

  I've always agreed with Mercurial's mantra, however, now that Mercurial comes bundled with the rebase extension and it is a popular practice in git, I'm wondering if it could really be regarded as a "bad practice", or at least bad enough to avoid using. In any case, I'm aware of rebasing being dangerous after pushing. OTOH, I see the point of trying to package 5 commits in a single one to make it look niftier (specially at in a production branch), however, personally I think would be better to be able to see partial commits to a feature where some experimentation is done, even if it is not as nifty, but seeing something like "Tried to do it way X but it is not as optimal as Y after all, doing it Z taking Y as base" would IMHO have good value to those studying the codebase and follow the developers train of thought. My very opinionated (as in dumb, visceral, biased) point of view is that programmers like rebase to hide mistakes... and I don't think this is good for the project at all. So my question is: have you really found valuable to have such "organic commits" (i.e. untampered history) in practice?, or conversely, do you prefer to run into nifty well-packed commits and disregard the programmers' experimentation process?; whichever one you chose, why does that work for you? (having other team members to keep history, or alternatively, rebasing it).

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• How do I set the UNC permissions on a SQL Server 2008 Filestream UNC?

  - by Justin Dearing

  I have a SQL Server 2008 instance. I have configured filestream access properly, and use it from one column on one table in one of my databases. However, I cannot access the UNC share for the filestream data. I have tried browsing to it as well as trying to open specific files and I get errors both ways. I am running SQL Server 2008 enterprise on a Windows 7 workstation running on the domain. I've tried running the sql server service as a local user, then as network admin. The user I am logged in as is a local admin and a sysadmin in SQL server.

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• ASP.NET design not SOLID

  - by w0051977

  SOLID principles are described here: http://en.wikipedia.org/wiki/SOLID_%28object-oriented_design%29 I am developing a large ASP.NET app. The previous developer created a few very large classes each with lots of different purposes. It is very difficult to maintain and extend. The classes are deployed to the web server along with the code behind files etc. I want to share a small amount of the app with another application. I am considering moving all of the classes of the ASP.NET web app to a DLL, so the small subset of functionality can be shared. I realise it would be better to only share the classes which contain code to be shared but because of the dependencies this is proving to be very difficult e.g. class A contains code that should be shared, however class A contains references to classes B, C, D, E, F, G etc, so class A cannot be shared on its own. I am planning to refactor the code in the future. As a temporary solution I am planning to convert all the classes into a single class library. Is this a bad idea and if so, is there an alternative? as I don't have time to refactor at the moment.

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• Tomcat / Railo stop responding with no error output

  - by andrewdixon

  This is going to sound very vague and I'm sure it will be voted down for not giving enough information however I don't really have any to give as you will see. We have an AWS instance running Amazon Linux, Apache, Tomcat and Railo and from time to time the Tomcat/Railo simply stops responding to requests and there are no errors output in the catalina.out file or any of the other log files in the Tomcat logs directory. When I issue the command to restart Tomcat/Railo the restart scripts sits there for a while then says that Tomcat has not responded so it has killed it off and then it starts up again and everything is fine until it happens again, anything from a couple of minutes to a couple of days later. I have done my best to check other logs on the server but have found no messages at all to indicate why Tomcat/Railo has given up and stopped responding. Can anyone suggest any reason why it might be doing this and / or any other log file(s) that we could check to see what is happening. Thanks. Andrew.

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• Wordpress Installation on Two Servers - Loadbalancing

  - by rihatum

  Hi All, I have to install wordpress (One Blog, one domain, for e.g. mycompany.com/blog) on two servers sharing one database on a different server, these two servers are behind a loadbalancer and the db would be on another server. We are planning this way due to high traffic. I have done standalone wordpress installations on a single server, on windows 2003, 2008 with IIS6, 7 etc I am just researching as to how would I implement this. What would be the steps to achieve this and upon searching I saw some posts regarding the wp-content/uploads directory to be synced at regular intervals ? your help much appreciated Thanks for reading

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• IRC Services with failover support?

  - by insertjokehere

  I run a single server (call it 'server A') IRC 'network', and thank to the generosity of some friends, I have been given a second server ('server B') that I can run an IRCd on in order to provide redundancy in case server A crashes. This is fine, I can set up a round-robin DNS with the servers linked. The problem I have is what to do about services? Does anyone know of a way to get the services to 'fail over' in case of a server failure? Eg, Server A starts off running the services, but suddenly crashes. Server B detects this and starts its own copy of the services (ideally with the same configuration and data as the services on Server B) One solution that comes it mind is to write a bot that each server runs, that sit in a channel periodically checking if the bot from the other server is in the channel. If it is, then all is well. If not, then failover. I would prefer not to have to code this myself though We are currently using Unreal IRCd and Anope services on Linux

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• Asking for Credentials, when requesting shared folders on the server, regularly for domain users?

  - by MFH

  In our network, single domain controller, when some users (members of the domain) request shared folders on the server they are required to enter their credentials, the server is Windows Server 2008 R2, even checking to remember my credentials doesn't work, sometimes it shows this message: "The system has detected a possible attempt to compromise security. Please ensure that you can contact the server that authenticated you", sometimes it shows different messages, when I try to recreate the case sometimes I failed, I searched Google for it, I didn't find useful results, some talk about kerberos, but we don't use kerberos, this keeps going each day or two, how to overcome this, I don't want these messages to appear to users?

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• Dealing with Fine-Grained Cache Entries in Coherence

  - by jpurdy

  On occasion we have seen significant memory overhead when using very small cache entries. Consider the case where there is a small key (say a synthetic key stored in a long) and a small value (perhaps a number or short string). With most backing maps, each cache entry will require an instance of Map.Entry, and in the case of a LocalCache backing map (used for expiry and eviction), there is additional metadata stored (such as last access time). Given the size of this data (usually a few dozen bytes) and the granularity of Java memory allocation (often a minimum of 32 bytes per object, depending on the specific JVM implementation), it is easily possible to end up with the case where the cache entry appears to be a couple dozen bytes but ends up occupying several hundred bytes of actual heap, resulting in anywhere from a 5x to 10x increase in stated memory requirements. In most cases, this increase applies to only a few small NamedCaches, and is inconsequential -- but in some cases it might apply to one or more very large NamedCaches, in which case it may dominate memory sizing calculations. Ultimately, the requirement is to avoid the per-entry overhead, which can be done either at the application level by grouping multiple logical entries into single cache entries, or at the backing map level, again by combining multiple entries into a smaller number of larger heap objects. At the application level, it may be possible to combine objects based on parent-child or sibling relationships (basically the same requirements that would apply to using partition affinity). If there is no natural relationship, it may still be possible to combine objects, effectively using a Coherence NamedCache as a "map of maps". This forces the application to first find a collection of objects (by performing a partial hash) and then to look within that collection for the desired object. This is most naturally implemented as a collection of entry processors to avoid pulling unnecessary data back to the client (and also to encapsulate that logic within a service layer). At the backing map level, the NIO storage option keeps keys on heap, and so has limited benefit for this situation. The Elastic Data features of Coherence naturally combine entries into larger heap objects, with the caveat that only data -- and not indexes -- can be stored in Elastic Data.

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• Can Windows XP remember file icon position?

  - by g .

  Windows allows you to arrange icons however you like in a window. However after some time when I go back to the window, it has forgotten the icon positions and has completely rearranged the icons. Is there a way to preserve the icon positions? In the previous version of Windows I used, this would happen on rare occasions (about 6 months) and it might only move a couple of icons. Now it is happening practically every day and it is every single icon. Attempts to rearrange them manually are futile and it is increasingly maddening. Searching Google, I have found a number of programs that allow you to save and restore icon position on the desktop. But, this is just a regular folder window so I am not sure if any of those would even work. Some details: Windows XP SP 3 running in Parallels 5 virtual machine Auto Arrange and Align to Grid are NOT turned on Fresh OS install and only setting icon positions in one window

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• What type of pattern would be used in this case

  - by Admiral Kunkka

  I want to know how to tackle this type of scenario. We are building a person's background, from scratch, and I want to know, conceptually, how to proceed with a secure object pattern in both design and execution... I've been reading on Factory patterns, Model-View-Controller types, Dependency injection, Singleton approaches... and I can't seem to grasp or 'fit' these types of designs decisions into what I'm trying to do.. First and foremost, I started with having a big jack-of-all-trades class, then I read some more, and some tips were to make sure your classes only have a single purpose.. which makes sense and I started breaking down certain things into other classes. Okay, cool. Now I'm looking at dependency injection and kind of didn't really know what's going on. Example/insight of what kind of heirarchy I need to accomplish... class Person needs to access and build from a multitude of different classes. class Culture needs to access a sub-class for culture benefits class Social needs to access class Culture, and other sub-classes class Birth needs to access Social, Culture, and other sub-classes class Childhood/Adolescence/Adulthood need to access everything. Also, depending on different rolls, this class heirarchy needs to create multiple people as well, such as Family, and their backgrounds using some, if not all, of these same classes. Think of it as a people generator, all random, with backgrounds and things that happen to them. Ageing, death of loved ones, military careers, e.t.c. Most of the generation is done randomly, making calls to a mt_rand function to pick from most of the selections inside the classes, guaranteeing the data to be absolutely random. I have most of the bulk-data down, and was looking for some insight from fellow programmers, what do you think?

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• RAID 1 not performing as expected

  - by Faken

  I recently bought a new 320Gb hard drive for my computer to set up RAID 1 on it for some added security. Installation went as smooth as could possibly be (plug in power, plug in data cable, start up computer, Intel software recognized new drive, right click create RAID 1, done!). However, for some inexplicable reason, I seem to have strange test results when using BENCH32. On my old configuration, a single 7200 rpm drive, I achieved about 60 MB/s write and 70 MB/s read. With a new RAID 1 configuration, I would expect the write to be slightly diminished but read to be significantly improved (though not exactly double speed). However, with the new configuration, I am getting 90 MB/s write and only about 80 MB/s read. I should NOT be getting improved write performance, especially NOT better than read! What's going on? My system setup is: q6600 2.4ghz CPU 4Gb DDR2 667mhz RAM on board Intel ICH9R "RAID chip" 2x Seagate 7200 RPM 320GB drives in RAID 1 Widows 7 home premium 64-bit

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• What's the strengths and weaknesses of existing configuration management systems?

  - by Daniel C. Sobral

  I was looking up here for some comparisons between CFEngine, Puppet, Chef, bcfg2, AutomateIt and whatever other configuration management systems might be out there, and was very surprised I could find very little here on Server Fault. For instance, I only knew of the first three links above -- the other two I found on a related google search. So, I'm not interested in what people think is the best one, or which they like. I'd like to know the following: Configuration Management System's name. Why it was created (as opposed to using an existing solution). Relative strengths. Relative weaknesses. License. Link to project and examples.

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