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• Graph visualization code in javascript?

  - by Chris Farmer

  Hi. I have a data structure that represents a directed graph, and I want to render that dynamically on an HTML page. Does anyone know of any javascript code that can do a reasonable job with graph layout? These graphs will usually be just a few nodes, maybe ten at the very upper end, so my guess is that performance isn't going to be a big deal. Ideally, I'd like to be able to hook it in with jQuery so that users can tweak the layout manually by dragging the nodes around. Edit: Google's Visualization API seems to be more "graphs as charts" oriented than "graphs as nodes" oriented. I didn't see any node-oriented visualizations already built there, anyway. Do you know that one exists?

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• Unable to run OpenMPI across more than two machines

  - by rcollyer

  When attempting to run the first example in the boost::mpi tutorial, I was unable to run across more than two machines. Specifically, this seemed to run fine: mpirun -hostfile hostnames -np 4 boost1 with each hostname in hostnames as <node_name> slots=2 max_slots=2. But, when I increase the number of processes to 5, it just hangs. I have decreased the number of slots/max_slots to 1 with the same result when I exceed 2 machines. On the nodes, this shows up in the job list: <user> Ss orted --daemonize -mca ess env -mca orte_ess_jobid 388497408 \ -mca orte_ess_vpid 2 -mca orte_ess_num_procs 3 -hnp-uri \ 388497408.0;tcp://<node_ip>:48823 Additionally, when I kill it, I get this message: node2- daemon did not report back when launched node3- daemon did not report back when launched The cluster is set up with the mpi and boost libs accessible on an NFS mounted drive. Am I running into a deadlock with NFS? Or, is something else going on?

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• HAproxy roundrobin balancing does not appear to be distributing evently

  - by andrew

  Hello, I know that with loaded servers, roundrobin in HAproxy (1.4.4) does not evenly distribute, but my servers are currently getting NO traffic (test setup), and roundrobin balancing does www1,www1,www1,www1,www1,...www2,www2,www2,...,www1... I'm verifying this by having the script being run on each server cat /etc/HOSTNAME (slackware). I need to have it switch back and forth each time to test some session stuff (stored in shared memcached) but am having trouble getting it to switch between my two web servers on each request. global log 127.0.0.1 local0 warning maxconn 4096 chroot /usr/share/haproxy pidfile /var/run/haproxy.pid uid 99 gid 99 daemon defaults balance roundrobin fullconn 100 maxconn 4096 mode http option dontlognull option http-server-close option forwardfor option redispatch retries 3 timeout connect 5000 timeout client 20000 timeout server 60000 timeout queue 60000 stats enable stats uri /haproxy stats auth ***:*** frontend www *:80 log global acl is_upload hdr_dom(host) -i uploads.site.com acl is_api hdr_dom(host) -i api.site.com acl is_dev hdr_dom(host) -i dev.site.com acl is_apidev hdr_dom(host) -i apidev.site.com use_backend uploads.site.com if is_upload use_backend api.site.com if is_api use_backend dev.site.com if is_dev !is_apidev default_backend site.com backend site.com option httpchk HEAD /alive.php HTTP/1.1\r\nHost:site.com server www1 1.1.1.1:8080 weight 10 minconn 5 maxconn 25 check inter 2000 rise 2 fall 2 server www2 1.1.1.2:8080 weight 10 minconn 5 maxconn 25 check inter 2000 rise 2 fall 2 backend api.site.com option httpchk HEAD /alive.php HTTP/1.1\r\nHost:api.site.com server www1 1.1.1.1:8080 weight 10 minconn 5 maxconn 25 check inter 2000 rise 2 fall 2 server www2 1.1.1.2:8080 weight 10 minconn 5 maxconn 25 check inter 2000 rise 2 fall 2 backend dev.site.com option httpchk HEAD /alive.php HTTP/1.1\r\nHost:dev.site.com server www1 1.1.1.1:8080 weight 10 minconn 5 maxconn 25 check inter 2000 rise 2 fall 2 server www2 1.1.1.2:8080 weight 10 minconn 5 maxconn 25 check inter 2000 rise 2 fall 2 backend uploads.site.com option httpchk HEAD /alive.php HTTP/1.1\r\nHost:uploads.site.com server www1 1.1.1.1:8080 weight 10 minconn 5 maxconn 25 check inter 2000 rise 2 fall 2 server www2 1.1.1.2:8080 backup weight 10 minconn 5 maxconn 25 check inter 2000 rise 2 fall 2 So basically, I have some different back-ends (I've verified the ACLs are working), with the default option "roundrobin" selected. I've tried removing weights, removing the minconn/maxconn/fullconn attributes for all servers (not just the backend I'm testing), tried removing the ACLs, etc. I've been testing on dev.site.com BTW. Anyone see a reason why I can't get something like www1,www2,www1,www2,...? Also, this is one of my first questions on here, so please let me know if I left anything needed out of my post. Thanks!

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• Spring bean's DESTROY-METHOD attribute [does not work for me]

  - by EugeneP

  Can get work the attribute "destroy-method". First, even if I type non-existing method name into "destroy-method" attribute, Spring initialization completes fine (already strange!). Next, when a bean has a "prototype" scope, then I suppose it must be destroyed before the application is closed. That not happens, it is simply never called in my case. Though, after extracting this bean I can call this method explicitly and it does its job. Could you explain why this method is never called in my Spring 2.5 case? p.s. The method exists, it is public and has no arguments.

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• SQL Server 2008 Table Maintenance - Rebuild, Reorganize, Update Stats, Check Integrity etc HELP!

  - by Albert

  I'm migrating a ~15GB database from SQL Server 2005 to a new server running SQL Server 2008, and along with that I need to create all the new Maintenance Plans. I can take care of all the backup stuff, but the table maintenance baffles me some. Does anyone have any input on how often I should (or how often you do would suffice too) the following tasks? Check Database Integrity Rebuild Indexes Reorganize Indexes Update Statistics Shrink Database? Am I missing anything? Again if you can share how often you do these tasks that would be great...and/or share any general information about your approach to table maintenance that would be helpful. Lastly does it matter what order I run these tasks in (when setting up a job)?

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• Why is Windows Task Scheduler trying to launch multiple instances?

  - by Paul H

  We have a number of Windows Scheduled tasks that run on one Server 2008 Webserver (not R2) which is in a cluster. We recently moved from an original webserver Cluster to a new webserver Cluser (Server 2008 - not R2). The new webserver (in the cluster) running the Windows Tasks is setup the same as on the original we believe. BUT we now find that on the new Windows Server the Windows Task Scheduler seems to want to instantly start each task three times. If we set the option to queue up a new task we get: Event ID 324 Task Scheduler queued instance "{9a1a8411-b042-45ff-8e6b-89874df230d7}" of task "\Client Reporting" and will launch it as soon as instance "{2bcc3df6-ea3b-4453-90c2-75b8b1946388}" completes. If we set the option to stop an existing task we get: Event ID 323 Task Scheduler stopped instance "{e685a910-b32b-414e-85fd-96bbe54314a2}" of task "\Client Reporting" in order to launch new instance "{4db66265-1f51-4ede-8535-ac7c3cb5c4c1}" . Ticked settings: Allow task to be run on demand. Run task as soon as possible after a scheduled start is missed. Stop the task if running for longer than 1 hour. If the running task does not end when requested force it to stop. Start the task only if the computer is on AC power. Stop the task if the computer switches to battery power. Selected option: If the task is already running - stop the existing instance. Note: We moved the tasks from one server to another in the cluster to see if it the Task Scheduler on the particular server we'd picked causing the problem. Same behaviour. Could it be something to do with the build of the new servers? We have very similar tasks set up on another server cluster that work OK without all this multiple starting. Comparing those tasks to the ones here - there does not seem to be anything obviously different in terms of settings available to us through the options within the Task Scheduler. Trigger: The task is scheduled to be triggered daily, once an hour - and to be stopped if it exceeds this time. Action: Runs a .bat file. What could be causing this/where we can look to see what logic is causing the tasks to start multiple times in this way?

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• What are the best uses for each programming language?

  - by VirtuosiMedia

  I come from a web developer background, so I'm fairly familiar with PHP and JavaScript, but I'd eventually like to branch out into other languages. At this point, I don't have a particular direction or platform that I'm leaning toward as far as learning a new language or what I would use it for, but I would like to learn a little bit more about programming languages in general and what each one is used for. I've often heard (and I agree) that you should use the right tool for the job, so what jobs are each programming language best suited for? Edit: If you've worked with some of the newer or more obscure languages, please share for those as well.

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• How do I properly implement Unicode passwords?

  - by Sorin Sbarnea

  Adding support for Unicode passwords it an important feature that should not be ignored by the developpers. Still adding support for Unicode in the passwords it's a tricky job because the same text can be encoded in different ways in Unicode and this is not something you may want to prevent people from logging in due to this. Let's say that you'll store the passwords os UTF-8. Now the question is how you should normalize the Unicode data? You had to be sure that you'll be able to compare it. You need to be sure that when the next Unicode standard will be released it will not invalidate your password verification. Note: still there are some places where Unicode passwords are probably never be used, but this question is not about why or when to use Unicode passwords, is about how to implement them the proper way.

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• HTML - Word Doc Images

  - by Michael

  Okay I have roughly 150 + pages of procedures all written in MS word. The person who wrote the procedures did an excellent job of recording the process how to perform specific tasks. This individual went though and created screen shots a MS word doc. There are approx 2 screen shots per page. So it is roughly 300 images and I do not want to recreate the wheel. Does anyone know a quick way of handling the images? The written portion is pretty straightforward but the images is what I am struggling with. Regards, Mike

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• Lightweight PHP library alternative to common frameworks

  - by artarad

  Hi hi, I'm looking for a easy to learn php library to use for my coming web app project. I've recently finished a web app with fully handwritten raw php code and it's absolutely hard to be done again for another project. even though I have the recent project code snippets to be used again, but due to their non-structural arrangement (not object oriented), i have no passion to use 'em again. I have no experience with common frameworks like ZF, CakePhp, CodeIgniter, so I think to get my hands on a multipurpose OO library for my web app and the framework learning will be the next step! any suggestion? UPDATE: Many thanks guys, I have not enough time to get through the depth of every lib or framework you have kindly introduced. Since I'm going one step further I'm going to use ZF as famous framework which could provide me more job opportunities perhaps. thankssss :)

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• Problems with dotLess Stopping characters and hacks list?

  - by rDeeb

  Have any one run into trouble when running dotLess and having hacks on your CSS files? Been working on a project... just installed dotLess after one year of development to ease a little bit the job of creating new CSS files for some new functionality of the web site, and recently our old CSS is not working correctly. Viewing the resulting CSS files we realized that the dotLess compiler stopeed at some hacks like this one: html>/**/body #itemTable .informationView fieldset textarea { min-height: 1.3em; height: 1.3em; } So we were wondering if there is any list of stopping words or hacks for dotLess?

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• Finding out if an IP address is static or dynamic?

  - by Joshua

  I run a large bulletin board and I get spammers every now and again. My moderation team does a good job filtering them out but every time I IP ban them they seem to come back (I'm pretty sure it's the same person on some occasions, as the post patterns are exactly the same as are the usernames) but I'm afraid to ban them by IP address every time. If they are on a dynamic IP address, I could be banning innocent users later down the line when they try to get to my forum through SERPs, but if I ban only via static IPs I know that I'm only banning that one person. So, is there a way to properly determine if an IP address is static or dynamic? Thanks.

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• Testing perceived performance

  - by Josh Kelley

  I recently got a shiny new development workstation. The only disadvantage of this is that the desktop apps I'm developing now run very, very fast, and so I fear that parts of the code that would be annoyingly slow on end users' machines will go unnoticed during my testing. Is there a good way to slow down an application for testing? I've tried searching around, but all of the results I've been able to find seem pretty fiddly to set up (e.g., manually setting up a high-priority CPU-bound task on the same CPU core as the target app, or running a background process that rapidly interrupts and resumes the target app), and I don't know if the end result is actually a good representation of running on a slower computer (with its slower CPU, slower RAM, slower disk I/O...). I don't think that this is a job for a profiler; I'm interested in the user's perception of end-to-end performance rather than in where the time goes for particular operations.

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• Scala in image procesing

  - by Mayank Sinha

  I am new to scala and keep on researching and compiling programs , But i am more interested in Image processing in scala. Iam doing project in eclipse environment from http://www.scala-lang.org/download/2.11.0-M5.html but i couldn't find any resource to do image processing in scala . please provide me all information i.e How to install image processing package till manuals of the package to read and write image. I have tried Maven ,jmagic,opencv ,javacv etc but couldn't succeeded. Please reply with in hours my job is at stake. Mayank

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• Why doesn't GCC produce a warning when assigning a signed literal to an unsigned type?

  - by maerics

  Several questions on this website reveal pitfalls when mixing signed and unsigned types and most compilers seem to do a good job about generating warnings of this type. However, GCC doesn't seem to care when assigning a signed constant to an unsigned type! Consider the following program: /* foo.c */ #include <stdio.h> int main(void) { unsigned int x=20, y=-30; if (x > y) { printf("%d > %d\n", x, y); } else { printf("%d <= %d\n", x, y); } return 0; } Compilation with GCC 4.2.1 as below produces no output on the console: gcc -Werror -Wall -Wextra -pedantic foo.c -o foo The resulting executable generates the following output: $ ./foo 20 <= -30 Is there some reason that GCC doesn't generate any warning or error message when assigning the signed value -30 to the unsigned integer variable y?

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• How to count incrementally in SQL SERVER

  - by joe

  Hi Folks, I am assigned a problem which i am not sure how to write it in SQL SEVER (version 5/8) yet. Here is the simple query and its output: Select location, date_time, Item_sold From Product Location Date_time Item_sold VA 12/10/2010 1:30:00 PM Candy VA 12/10/2010 3:30:00 PM Chips VA 12/13/2010 12:50:00 AM Wine DC 12/13/2010 8:00:00 AM Gum DC 12/13/2010 12:30:00 PM Bags DC 12/13/2010 1:16:00 PM Cheese DC 12/13/2010 12:00:00 AM Hotdog NJ 12/15/2010 12:00:00 AM Coffee NJ 12/15/2010 1:15:00 PM Beers NJ 12/15/2010 3:45:00 AM Cream Here is my desired output, which I guess a while/for loop or a pivot function could do the job but my experience is not there yet. Basically, I need to count the number of item sold from the Item_sold column incrementally (base line date starts from 12/8 to 12/9, 12/8 to 12/10, 12/8 to 12/11, 12/8 to 12/12...) I was wondering if anyone could edcuate and solve this problem. Many thanks in advance, Joe Location 12/8 |12/8-12/9 |12/8-12/10 |12/8 - 12/11 |12/8 - 12/12 |12/8 - 12/13 VA 0 0 2 0 0 3 DC 0 0 0 0 0 4

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• Twitter - Get users live tweets on my website instantly

  - by Gublooo

  Hello guys, I was checking out the stocktwits.com website. While signing up I provided them with my twitter username. Now whenever I tweet and if my tweet contains $ and a stock ticker symbol - it instantly appears on Stocktwits.com I am interested in implementing something similar in my website. Just wanted an understanding of how this would work. This is how I'm assuming it would work at a high level: 1) On my website - require users to provide their twitter usernames 2) Run a cron job every few minutes to pull the latest tweets for each of the usernames provided using something like http://twitter.com/statuses/user_timeline/username.xml I've tried Stocktwits and they updates are almost instantaneous - so it does not appear like they are checking for updates every few minutes. What are the best ways to implement this solution Thanks

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• castle scheduler - cluster

  - by cvista

  Hi We're using the castle scheduler component: http://using.castleproject.org/display/Comp/Castle.Components.Scheduler?showChildren=false I have a wcf service which creates the tasks and that does it's job fine. I then have a console app running (will be a windows service eventually) which should then keep an eye out for tasks to run. Thing is the each create their own scheduler in the DB but they both have the same clusterid. Should the console app be able to run the tasks created by the wcf service? If not - how can i make it do that? Cheers w://

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• Developing ebooks- software?

  - by Mark Mayo

  I've written a few documents for friends or blogs on software testing, job hunting and android development. I've been toying with the idea of producing some programming-related ebooks. However, developing these in Word or OpenOffice seems too amateurish compared to some of the fantastically produced books out there. I'm proficient in LaTeX but have never seen it used to produce ... 'marketable' works - just technical papers, maths, etc - which is great for code but not for distribution. Has anyone seen any good (preferably free / open source) tool or software for developing/compiling professional-looking marketable ebooks (probably to .pdf or .exe format - but I can take care of that part if need be)? And more importantly, ones that are easy to use to format any code samples or snippets that I may choose to include. Much appreciated.

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• MySQL query cache vs caching result-sets in the application layer

  - by GetFree

  I'm running a php/mysql-driven website with a lot of visits and I'm considering the possibility of caching result-sets in shared memory in order to reduce database load. However, right now MySQL's query cache is enabled and it seems to be doing a pretty good job since if I disable query caching, the use of CPU jumps to 100% immediately. Given that situation, I dont know if caching result-sets (or even the generated HTML code) locally in shared memory with PHP will result in any noticeable performace improvement. Does anyone out there have any experience on this matter? PS: Please avoid suggesting heavy-artillery solutions like memcached. Right now I'm looking for simple solutions that dont require too much time to implement, deploy and maintain.

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• How to tell binary from text files in linux

  - by gabor

  The linux file command does a very good job in recognising file types and gives very fine-grained results. The diff tool is able to tell binary files from text files, producing a different output. Is there a way to tell binary files form text files? All I want is a yes/no answer whether a given file is binary. Because it's difficult to define binary, let's say I want to know if diff will attempt a text-based comparison. To clarify the question: I do not care if it's ASCII text or XML as long as it's text. Also, I do not want to differentiate between MP3 and JPEG files, as they're all binary.

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• Redirect away from HTTPS with ASP.NET MVC App

  - by Amadiere

  I'm using ASP.NET MVC 2 and have a login page that is secured via HTTPS. To ensure that the user always accesses those pages via SSL, I've added the attribute [RequiresHttps] to the controller. This does the job perfectly. When they have successfully logged in, I'd like to redirect them back to HTTP version. However, there isn't a [RequiresHttp] attribute and I'm struggling to get my head around how I might achieve this. The added (potential) complication is that the website when in production is hosted at the route of the domain, but for development and testing purposes it is within a sub directory / virtual directory / application. Am I over-thinking this and is there an easy solution staring me in the face? Or is it a little more complex?

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• skip-limit ignored for skippable exception thrown from writer

  - by ck

  i am working on a project with spring batch 2.0.2 and have skippable exception set up in the config. for exceptions thrown from the processor everything works fine. it skips and once the limit is execeed the job fails (or stops). for exceptions thrown from the writer (same chunk) it keeps skipping. the skip-limit doesnt seem to matter. maybe i missunderstood and skipping and writer don't go together or maybe i am missing a configuration. does anyone know how to skip issues - with a limit - within the writer properly?

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• How to re-use a thread in Java ?

  - by David

  I am a building a console Sudoku Solver where the main objective is raw speed. I now have a ManagerThread that starts WorkerThreads to compute the neibhbors of each cell. So one WorkerThread is started for each cell right now. How can I re-use an existing thread that has completed its work? The Thread Pool Pattern seems to be the solution, but I don't understand what to do to prevent the thread from dying once its job has been completed. ps : I do not expect to gain much performance for this particular task, just want to experiment how multi-threading works before applying it to the more complex parts of the code. Thanks

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• Programmer Health - how to avoid going blind and sick!

  - by stefanyko

  Hi All! this is my very first time here! so nice to meet you guys! ;-) When i was starting with this job, ( when i have chosed of doing this for the rest of my life) i have thinked also, one day, before or after, i would become blind or at least sick by drinking 5 or more coffee per day and of course by sitting down on my pc for hours!!! ;-\ From many years now, i'm asking myself how my eyes can stay in front o the monitor for so many hours per day!? well now i'm to a point of no return!!! i feel my eyes each day more tired, and my productivity is waning, but i can't change work now and i don't want do this!!!! what i need to do for prevent this to become a more serious problem for me and for my eyes!? any suggestion will be really appreciated!!! Thanks!

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