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  • Ubuntu 10.4 Lucid Server Minimal Install: Slow terminal scrolling

    - by noname
    I have a minimal install of Ubuntu 10.4 Server for testing and learning purposes. There is a very annoying occurrance: whenever I try to "man dpkg" or any command that load a few screens length of text (eg. "ls -al") the redraw speed of the console is just way too slow. I can see how each new line causes the whole screen to redraw. Note: that this doesn't happen inside X. No gui is installed. I have been experimenting with adding vesafb to the grub line as some guides suggested, but no speedups happened. You might be able to reproduce this behaviour on your linux system by switching to terminal using CTRL+ALT+F1. Is there any way to speed scrolling up?

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  • Jenkins shows same information for all projects

    - by SuperCabbage
    I've been using Jenkins for the last month or so and what started out as a small issue has gotten worse and worse. I have 10 projects in Jenkins, all polling from different Git repos and building to different environments but they all show the same details on the dashboard. I can still build the projects, but I have to manually enter the URL to see any console output etc. I'm running 1.536 under Ubuntu 12.04, there's not much in the logs other than the following; Oct 22, 2013 2:21:19 PM WARNING jenkins.model.lazy.AbstractLazyLoadRunMap search JENKINS-15652 Assertion error #1: failing to load /data/builds #20 EXACT: lo=23,hi=9,size=23,size2=23 – Any ideas?

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  • Laptop with internal serial port in 2009 (and 2010)

    - by Vincent Demeester
    Are there any computer vendors (like Dell, Lenovo, or..) that still sell laptops with an internal serial port? We are using several modem and other kind of box at work that have to be used (and/or programmed) with serial port (RS232, DB9, ..). We tried many usb/pcmcia serial adapter which run fine when used to load programs on the boxes but not with modems. The protocol behind the RTC connection (with modem) need timer we are not able to reach when using an adapter (maybe until we find a very good adapter), and that leads to my question..

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  • Routing to a Terminal Services Cluster

    - by Dave
    I am trying to connect to a Load Balanced Windows 2008 R2 cluster using Remote Desktop Services. I have no trouble connecting to the the Servers' IP addresses (.253.16 and .253.17) or the Cluster address (.253.20) from inside the subnet (.253). The trouble is when I try to connect from the other subnet(.251). I can remote to the other non-clustered servers (.253.12 and .253.15) inside the .253 subnet from the .251 without an issue. I receive a ping reply from the cluster and other servers when I am on the .251 subnet. But when I try to connect via remote desktop it times out but only to any of the IPs on the cluster (.20,.17,.16). My ASA 5510 handling the routing reports message in the log: Deny TCP (no connection) from 192.168.251.2/4283 to 192.168.253.16/3389 flag FIN PSH ACK Here is a picture if it helps http://dl.dropbox.com/u/4217864/terminal%20server.jpg Thanks for any help

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  • How to optimize sandboxie for faster application loading

    - by user23950
    I'm referring to this one: http://www.sandboxie.com/index.php?DownloadSandboxie Do you know of any alternatives that might be better than this software. And if you don't know of any alternative. Can you show me how can I make it faster to load firefox. Or any other browser. Because it really makes application incredibly slow at loading when you run them inside a sandbox. I've also seen lots from here: http://superuser.com/questions/57129/alternative-to-sandboxie-for-64-bit-systems Do you know of any other?

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  • apache and ajp performance

    - by user12145
    I have an apache sitting in front of two tomcat app servers(one on the same physical server, the other on a different one) that does time consuming work(0.5 sec to 10sec per request). The apache http server is getting killed by an average of 1 to 2 concurrent requests per second. both Server spec is about 2GB of RAM. Is there a way to optimize apache to handle the load? any advise is welcome. BalancerMember ajp://localhost:8009/whoisserver BalancerMember ajp://XXX.XX.XXX.XX:8009/whoisserver I keep getting the following in apache2.2 log: [Mon Dec 28 00:31:02 2009] [error] ajp_read_header: ajp_ilink_receive failed [Mon Dec 28 00:31:02 2009] [error] (120006)APR does not understand this error code: proxy: read response failed from 127.0.0.1:8009 (localhost)

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  • [Dear Recruiter] I developed in Mo'Fusion

    - by refuctored
    Forward: Sometimes I really feel like technology recruiters have no experience or knowledge of the field they are recruting for.  A warning to those companies hiring technical recruiters -- ensure that the technical recruiters you hire to fill a position are actually technical.  Here's proof below, where I make up completely ridiculous technologies, but still have interest from the recruiter for an interview. Letter to me: Hello - Your name came up as a possible match for a long term contract Cold Fusion Developer role I have in Bothell, WA.  This role requires you to be onsite in Bothell, WA. This is  a tough role to fill so I was hoping you might have someone you can recommend? Unfortunately no telecommute. Thank you! Sincerly, Mindy Recruiter My response: Mindy -- Wow I'm super-excited that you took the time to contact me about this position!  Let me tell you, you won't be disappointed with my skill set! Firstly, I've been developing in ColdFusion since 1993 before it was owned by Adobe and it was operating under code name, "Hot-Jack".  Recently I started developing under the Domain-View-Driven-Domain-Model (DVDDM), integrating client-side CF on Moobuntu.  Not only do I have a boat load of ColdFusion EXP,  I also have a ton of experience in the open source communities lesser known derivative of CF, Mo'Fusion (MF).  I've also invested thousands of hours of my time learning esoteric programming languages. Look forward to working with you! George And her response: Hi George – just left you a message. Give me a call at your convenience.  The role does require someone to be onsite here.. are you able to relocate yourself? Mindy [Sigh]

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  • Gap in parallaxing background loop

    - by CinetiK
    The bug here is that my background kind of offset a bit itself from where it should draw and so I have this line. I have some troubles understanding why I get this bug when I set a speed that is different then 1,2,4,8,16,... In main class I set the speed depending on the player speed bgSpeed = -(int)playerMoveSpeed.X / 10; and here's my background class class ParallaxingBackground { Texture2D texture; Vector2[] positions; public int Speed { get; set;} public void Initialize(ContentManager content, String texturePath, int screenWidth, int speed) { texture = content.Load<Texture2D>(texturePath); this.Speed = speed; positions = new Vector2[screenWidth / texture.Width + 2]; for (int i = 0; i < positions.Length; i++) { positions[i] = new Vector2(i * texture.Width, 0); } } public void Update() { for (int i = 0; i < positions.Length; i++) { positions[i].X += Speed; if (Speed <= 0) { if (positions[i].X <= -texture.Width) { positions[i].X = texture.Width * (positions.Length - 1); } } else { if (positions[i].X >= texture.Width*(positions.Length - 1)) { positions[i].X = -texture.Width; } } } } public void Draw(SpriteBatch spriteBatch) { for (int i = 0; i < positions.Length; i++) { spriteBatch.Draw(texture, positions[i], Color.White); } } }

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  • Oracle Fusion Middleware 12c Updates (2013/10/17)

    - by Hiro
    Oracle Fusion Middleware 12c Media Pack ?????2013/10/17 ???????????????? 1. Oracle Tuxedo?? Oracle Tuxedo System and Applications Monitor Plus 12c Release 1 (12.1.1.1) for Oracle Tuxedo 9.1 for Linux x86 (32-bit) Oracle Tuxedo System and Applications Monitor Plus 12c Release 1 (12.1.1.1) for Oracle Tuxedo 9.1 for HP-UX PA-RISC (32-bit) Oracle Tuxedo System and Applications Monitor Plus 12c Release 1 (12.1.1.1) for Oracle Tuxedo 11.1.1.2.0 for HP-UX Itanium (64-bit) Oracle Service Architecture Leveraging Tuxedo (SALT) 12cR1 (12.1.1.0) for HP-UX Itanium (64-bit) ??????????????? ???3????????????????·?????????????????????????????? (OS)???????Oracle Tuxedo 9.1, ????11.1.1.2.0 ????????????????Oracle Tuxedo System and Applications Monitor Plus (TSAM Plus) 12c?????? ???Oracle Service Architecture Leveraging Tuxedo (SALT) 12c???HP-UX Itanium????????????? 2. Data Integration?? Oracle Data Integrator 12c (12.1.2.0.0) Oracle Enterprise Data Quality 9.0.8 ??????????????? Oracle Data Integrator 12c????????????????? ????????????????·???????????????????????????·???????????????????????????? ???????????? Oracle GoldenGate???????????????E-LT (Extract, Load, Transform) ???????·?????????????·???????????????????????????????? ???·??????????·?????????????????????????????????????????·????????????????????????? Oracle Warehouse Builder???????????????????????????????Oracle Data Integrator?????????????????? Oracle Enterprise Manager Cloud Control 12c?????????????????IT??????? ????????????????????????????????????????????????·????????? ???(??)????·???????Oracle Data Integrator 12c????Oracle GoldenGate 12c??????????????????? ????????Oracle Data Integrator??????(??)?????·???????????????????????????? ?????

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  • Install problems with XSendFile on Ubuntu

    - by Dan
    I installed the apache dev headers: sudo apt-get install apache2-prefork-dev Downloaded and compiled the module as outlined here: http://tn123.ath.cx/mod_xsendfile/ Added the following line to /etc/apache2/mods-available/xsendfile.load: LoadModule xsendfile_module /usr/lib/apache2/modules/mod_xsendfile.so Added this to my VirtualHost: <VirtualHost *:80> XSendFile on XSendFilePath /path/to/protected/files/ Enabled the module by doing: sudo a2enmod xsendfile Then I restarted Apache. Then this code still just provides me with an empty file with 0 bytes: file_path = '/path/to/protected/files/some_file.zip' file_name = 'some_file.zip' response = HttpResponse('', mimetype='application/zip') response['Content-Disposition'] = 'attachment; filename=%s' % smart_str(file_name) response['X-Sendfile'] = smart_str(file_path) return response And there is not in the Apache error log that pertains to XSendFile. What am I doing wrong?

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  • Is taking a semester or year off from college a good idea?

    - by astrieanna
    I am currently a Junior majoring in Computer Science at a top university (in the USA). As I'm really getting tired of taking classes, I was wondering if taking a semester or year off to do an internship(s) is a reasonable idea? It seems like it would give me more experience programming (making classes a bit easier), and give me a chance to recover from the burnout that comes from taking 18 credits a semester. A friend suggested that I just take a lighter course load, but I only have 2 more semesters of financial aid, so I need to take 18 credits in each of them in order to finish. Taking time off from school is not a normal thing to do, at least at this school. Since more internships are advertised for the summer (that I've seen), I was wondering if there are internships available in times other than the summer? If I took off for a whole year, would it be more valuable to try to stay at the same company for the whole time or to try to get a series of internships at different ones? Valuable in both the sense of resume value and personal value. Would it be easier or harder to get multiple shorter internships?

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  • Partner Webcast - Focus on Oracle Data Profiling and Data Quality 11g

    - by lukasz.romaszewski(at)oracle.com
    Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-ansi-language:RO;} Partner Webcast Focus on Oracle Data Profiling and Data Quality 11g February 24th, 12am  CET   Oracle offers an integrated suite Data Quality software architected to discover and correct today's data quality problems and establish a platform prepared for tomorrow's yet unknown data challenges. Oracle Data Profiling provides data investigation, discovery, and profiling in support of quality, migration, integration, stewardship, and governance initiatives. It includes a broad range of features that expand upon basic profiling, including automated monitoring, business-rule validation, and trend analysis. Oracle Data Quality for Data Integrator provides cleansing, standardization, matching, address validation, location enrichment, and linking functions for global customer data and operational business data. It ensures that data adheres to established standards that are adaptable to fit each organization's specific needs.  Both single - and double - byte data are processed in local languages to provide a unique and centralized view of customers, products and services.   During this in-person briefing, Data Integration Solution Specialists will be providing a technical overview and a walkthrough.   Agenda ·         Oracle Data Integration Strategy overview ·         A focus on Oracle Data Profiling and Oracle Data Quality for Data Integrator: o   Oracle Data Profiling o   Oracle Data Quality for Data Integrator o   Live demoo   Q&A Delivery Format  This FREE online LIVE eSeminar will be delivered over the Web and Conference Call. Registrations   received less than 24hours  prior to start time may not receive confirmation to attend. To register , click here. For any questions please contact [email protected]

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  • How to design highly scalable web services in Java?

    - by Kshitiz Sharma
    I am creating some Web Services that would have 2000 concurrent users. The services are offered for free and are hence expected to get a large user base. In the future it may be required to scale up to 50,000 users. There are already a few other questions that address the issue like - Building highly scalable web services However my requirements differ from the question above. For example - My application does not have a user interface, so images, CSS, javascript are not an issue. It is in Java so suggestions like using HipHop to translate PHP to native code are useless. Hence I decided to ask my question separately. This is my project setup - Rest based Web services using Apache CXF Hibernate 3.0 (With relevant optimizations like lazy loading and custom HQL for tune up) Tomcat 6.0 MySql 5.5 My questions are - Are there alternatives to Mysql that offer better performance for what I'm trying to do? What are some general things to abide by in order to scale a Java based web application? I am thinking of putting my Application in two tomcat instances with httpd redirecting the request to appropriate tomcat on basis of load. Is this the right approach? Separate tomcat instances can help but then database becomes the bottleneck since both applications access the same database? I am a programmer not a Db Admin, how difficult would it be to cluster a Mysql database (or, to cluster whatever database offered as an alternative to 1)? How effective are caching solutions like EHCache? Any other general best practices? Some clarifications - Could you partition the data? Yes we could but we're trying to avoid it. We need to run a lot of data mining algorithms and the design would evolve over time so we can't be sure what lines of partition should be there.

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  • Time between AWS Notifying of Scale Down and Terminating instance

    - by SteveEdson
    Here is the scenario, there are multiple EC2 instances behind a load balancer. When traffic dies down, the SCALE_DOWN policy is triggered from a CloudWatch alarm. What I would like, is for the instance that is going to be terminated, or a separate server altogether, to be able to run a quick script that will execute a few commands to ensure all data has been transferred. My initial question was going to be how can I send a notification when an instance is going to be terminated by an auto scale, SCALE_DOWN policy. But then I saw this question Amazon EC2 notifying the instance when the autoscale service terminates it. If the notification is sent, how much time is there before the instance actually gets terminated? Are there any parameters to specify this time? Would it be a better idea to notify an instance that it is no longer needed, and get the instance to terminate itself once it has finished running the final script? Or, am I making this into a bigger problem than it actually is, and theres a far simpler solution?

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  • xDebug on Zend Server CE under Windows XP

    - by Hippyjim
    I have Zend Server installed on my Windows XP development machine, installed when I was naive and didn't know that Eclipse was going to become so suck so badly for PHP development. I've made the upgrade to Netbeans, but for debugging they only support xDebug. To be fair I've never used "proper" debuggers before, but other folks have raved about them so I thought I'd give it a try. I followed some directions on the Zend forum about how to install xDebug on Zend server, disabling Zend Debugger in the process. The xDebug "custom installation instructions" wizard tells me that my PHP was compiled with an unsupported compiler (MS VC8), and won't let me download anything. I tried a couple of the other xDebug binaries, but they just refused to load. So I'm left without a debugger option. Does anyone know how I can change the compiler of the php version I have installed so I can use a debugger in Netbeans? or how else i can get xDebug to install on Zend Server?

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  • Convert old AVI files to a modern format

    - by iWerner
    Hi, we have a collection of old home videos that were saved in AVI format a long time ago. I want to convert these files to a more modern format because the Totem Movie Player that comes with Ubuntu 10.4 seems to be the only program capable of playing them. The files seem to be encoded with a MJPEG codec, and playing them in VLC or Windows Media Player plays only the sound but there is no video. Avidemux was able to open the files, but the quality of the video is severely degraded: The video skips frames and is interlaced (it's not interlaced when playing it in Totem). Neither ffmpeg nor mencoder seems to be able to read the video stream. mencoder reports that it is using ffmpeg's codec. Here's a section from its output: ========================================================================== Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family [mjpeg @ 0x92a7260]mjpeg: using external huffman table [mjpeg @ 0x92a7260]mjpeg: error using external huffman table, switching back to internal Unsupported PixelFormat -1 Selected video codec: [ffmjpeg] vfm: ffmpeg (FFmpeg MJPEG) while running ffmpeg produces the following: $ ffmpeg -i input.avi output.avi FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1, Copyright (c) 2000-2009 Fabrice Bellard, et al. configuration: --extra-version=4:0.5.1-1ubuntu1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static libavutil 49.15. 0 / 49.15. 0 libavcodec 52.20. 1 / 52.20. 1 libavformat 52.31. 0 / 52.31. 0 libavdevice 52. 1. 0 / 52. 1. 0 libavfilter 0. 4. 0 / 0. 4. 0 libswscale 0. 7. 1 / 0. 7. 1 libpostproc 51. 2. 0 / 51. 2. 0 built on Mar 4 2010 12:35:30, gcc: 4.4.3 [avi @ 0x87952c0]non-interleaved AVI Input #0, avi, from 'input.avi': Duration: 00:00:15.24, start: 0.000000, bitrate: 22447 kb/s Stream #0.0: Video: mjpeg, yuvj422p, 720x544, 25 tbr, 25 tbn, 25 tbc Stream #0.1: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s Output #0, avi, to 'output.avi': Stream #0.0: Video: mpeg4, yuv420p, 720x544, q=2-31, 200 kb/s, 90k tbn, 25 tbc Stream #0.1: Audio: mp2, 44100 Hz, stereo, s16, 64 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 Press [q] to stop encoding frame= 0 fps= 0 q=0.0 Lsize= 143kB time=15.23 bitrate= 76.9kbits/s video:0kB audio:119kB global headers:0kB muxing overhead 20.101777% So the problem is that output does not contain any video, as evidenced by the video:0kB at the end. In all of the above cases the audio comes out fine. So my question is: What can I do to convert these files to a more modern format with more modern codecs?

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  • Graduate Life in Oracle by Ramakrishna Nalabothula

    - by david.talamelli
    Preparation for the BIG interview: I prepared in both technical and logical aspects to face the Oracle Interview. I had to cover almost all main areas in technical and many types of problems in logical areas. We attended mock- interviews and written tests at our college, browsed websites and communities. Having started with such a rigorous preparation before Oracle visited the college; it was possible for me to make it into the list of final selection. I put in a big effort to reach this position and I am very happy to achieve this. Why I chose Oracle: Oracle is one of the best technology providers and has a large customer base. I think it is not an easy job to offer services to that many customers. So, the company needs young and dynamic people and I wanted to be one among them. This gave me spirit and led me to walk into Oracle. I am working on different technologies and learning something new in the field. Having many customers is challenging Oracle and my work is challenging me. I am confident enough that customers to both me and Oracle will never lose their faith. Learning at Oracle: The style of learning is good and never resembles a classroom session in a college. It is always fun to learn here. There is no exam to track the performance. There is enough time until we completely learn it. There is no concept of stiff competition. Peers help through KT (Knowledge Transfers) and there are good resources in the Oracle to learn. People are always there to direct you to those. There are lots of opportunities for Web learning too! My Work Area: My team gives me a great opportunity to offer service to the entire product. There were no situations when I got tense with my work or targets and deliverables. I work with a Global Team and my manager is based in the UK. I have a lot of freedom and flexibility. I use the work from home option in case of any disturbances in the city or due to personal problems. I have a weekly meeting with my manager and use Instant Messenger for status updates. My manager plans very well to give me enough time to complete tasks. I have good coordination from the team towards our deadlines. My work has also brought me close to many people across various technology and product teams. I am glad to make many friends across Oracle. I am enjoying my time and work here. I cover all the major activities in the team. I am thankful to everyone from the Development and Quality Assurance Team to have high confidence in me by assigning such big responsibilities. Primary tasks are maintaining the environments that are very unstable at times. This really requires big time and effort to trace the root causes. I am working and still learning on all these areas. The happiest thing is I got chances to travel to USA & UK for training and for supporting a few customer demo projects. I have got to explore more across two countries and got sponsored to visit the places around due to Oracle's policies. I am very much thankful for these what I have from Oracle and for the cooperation there from other colleagues. Fun at Work: Oracle has a club from Employees to conduct games and events. I had an opportunity to participate in competitions, tournaments inside Oracle and Inter-Corporate for all games. I thank Oracle for providing me all these opportunities and I would like to extend my thanks to Senior Management for their confidence in me. I thank Oracle HR Recruiting Team too for selecting me into Oracle and giving me this opportunity to share my experience and feelings. Ramakrishna Nalabothula

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  • Download/update webpages listed in XML sitemap

    - by unor
    I'm searching a FLOSS tool that downloads all pages (and embedded resources, e.g. images) linked in a XML sitemap (built according to http://www.sitemaps.org/). The tool should "crawl" the sitemap regularly and look for new and deleted URLs and changes in the lastmod element. So whenever a page gets added/deleted/updated, the tool should apply the changes. Some sitemaps list sub-sitemaps in sitemapindex?sitemap. The tool should understand this and load all linked sub-sitemaps and look for URLs in there. I know there are tools that allow me to extract all URLs from the sitemap, so that I could feed them to wget or similar tools (see for example: Extract Links from a sitemap(xml)). But this wouldn't help in getting noticed about updates to pages. Tracking the webpages itself for updates doesn't work, because "secondary" content on the pages changes daily, but lastmod gets only updated when relevant content changed.

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  • Apache2 gettimeofday() keeps CPU at 100%

    - by pincoded
    I use Ubuntu 6.06.2 LTS with Server version: Apache/2.0.55; built:Aug 16 2010 18:25:39 and PHP 5.1.2 (cli) (built: Sep 16 2010 20:32:18). All my 4 Cores are constantly at 100% and the system begins to accumulate load. A restart for apache fixes the problem temporarily. I made a strace to the pid of the apache processes that keep the CPU busy. I get the following message continuously: gettimeofday({1285234145, 989639}, NULL) = 0 Do you have any ideas where this problem comes from? Thank you. UPDATE: The problem came from an application error that generated an infinite loop. Thank you all for your great help.

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  • apache2 slow responding (debian)

    - by baloo
    I'm running an apache2 2.2.9 webserver with modpython and mpm_worker_module. The current config for the mpm is ServerLimit 32 StartServers 10 MaxClients 800 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 25 MaxRequestsPerChild 0 The server has 1G of ram and a 100Mbit connection. Checking netstat -na | grep ESTABLISHED | wc -l gives me a number between 50 - 60. The load is about 1.0 Every pageload is also cached by memcached. I can't see why the server is so slow in responding to new connections, sometimes droping them completely? Also tried disabling iptables to make sure it's not because of a full state table or something like that. The only thing in dmesg is a lot of spam about "TCP: Treason uncloaked!"

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  • prevent apt dependency from being satisfied (permanently)

    - by Bryan Hunt
    I want to install mailman (just to use it's mail archiving feature) but Ubuntu wants to pull down a load of extra dependencies. sudo apt-get install mailman Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed: apache2 apache2-mpm-worker apache2.2-common Suggested packages: apache2-doc apache2-suexec apache2-suexec-custom spamassassin lynx listadmin Is there any way to mark those packages ( apache2 apache2-mpm-worker apache2.2-common ) as never to be installed? This is not 2002 ;)

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  • Grid pathfinding with a lot of entities

    - by Vee
    I'd like to explain this problem with a screenshot from a released game, DROD: Gunthro's Epic Blunder, by Caravel Games. The game is turn-based and tile-based. I'm trying to create something very similar (a clone of the game), and I've got most of the fundamentals done, but I'm having trouble implementing pathfinding. Look at the screenshot. The guys in yellow are friendly, and want to kill the roaches. Every turn, every guy in yellow pathfinds to the closest roach, and every roach pathfinds to the closest guy in yellow. By closest I mean the target with the shortest path, not a simple distance calculation. All of this without any kind of slowdown when loading the level or when passing turns. And all of the entities change position every turn. Also (not shown in screenshot), there can be doors that open and close and change the level's layout. Impressive. I've tried implementing pathfinding in my clone. First attempt was making every roach find a path to a yellow guy every turn, using a breadth-first search algorithm. Obviously incredibly slow with more than a single roach, and would get exponentially slower with more than a single yellow guy. Second attempt was mas making every yellow guy generate a pathmap (still breadth-first search) every time he moved. Worked perfectly with multiple roaches and a single yellow guy, but adding more yellow guys made the game slow and unplayable. Last attempt was implementing JPS (jump point search). Every entity would individually calculate a path to its target. Fast, but with a limited number of entities. Having less than half the entities in the screenshot would make the game slow. And also, I had to get the "closest" enemy by calculating distance, not shortest path. I've asked on the DROD forums how they did it, and a user replied that it was breadth-first search. The game is open source, and I took a look at the source code, but it's C++ (I'm using C#) and I found it confusing. I don't know how to do it. Every approach I tried isn't good enough. And I believe that DROD generates global pathmaps, somehow, but I can't understand how every entity find the best individual path to other entities that move every turn. What's the trick? This is a reply I just got on the DROD forums: Without having looked at the code I'd wager it's two (or so) pathmaps for the whole room: One to the nearest enemy, and one to the nearest friendly for every tile. There's no need to make a separate pathmap for every entity when the overall goal is "move towards nearest enemy/friendly"... just mark every tile with the number of moves it takes to the nearest target and have the entity chose the move that takes it to the tile with the lowest number. To be honest, I don't understand it that well.

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  • Windows - Delayed Write Failed error on USB hard drive

    - by ndngrd
    I've got a new Verbatim 1.5TB USB hard drive (Samsung HD154UI) and I'm finding myself completely unable to fill it. I'm using Windows XP. Whenever I try to copy a load of files over, it works for some time (will copy over between 20 and 90GB) but eventually stops with an error saying "The specified path is too deep" - the specified is not too deep, there's nothing more than 2 dirs deep that I'm copying. A balloon pops up at the bottom saying "Windows - Delayed Write Failed" telling me the data could not be copied. This wouldn't be too bad if I could just restart the transfer, but after this error has happened I can't write anything else to the disk - including if I eject it and then connect it to another machine. It just seems completely locked. The only way I can unlock it is to delete everything that I was copying to it. I've tried various USB cables and copying from different machines, and the same thing keeps happening.

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  • Unable to record sound from web browser (firefox / chromium ) using recordmydesktop

    - by thamurath
    I have to do some screencast tutorials and i am using recordmydesktop with gtk frontend to do it. I need to record also the sound and here is where i have found the problem. It took me some time, but now I can record the sound from almost every application in my desktop ... almost. I need to capture some sound from a web application using java, but when i load the page nothing appears in the playback tab of pavucontrol. I think this is the problem, because if there is no sound stream i think the recordmydesktop program thinks there is no sound to record ... the funny thing is that I can ear the sound in my speakers! I have tried with Firefox and Chromium with no success. Although I have been able to record youtube videos without problem, so it seems that java is the key here. Any suggestion or idea? P.S.: I am using Ubuntu 11.10 with this configuration. ( if more information is needed please let me know) sight i cannot post images ... so I have an audigy2 sound card using Analog Stereo Output profile. I have also an "Internal Audio" device, but i have it with the "Off" profile. In recordmydesktop-Advanced-Sound: Device = default

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  • apache2 mod_rewrite enable, but not working

    - by user611478
    I have enabled mod_rewrite on my server and confirmed it using phpinfo() and it shows as enabled. I have the following in my httpd.conf file: ServerName 172.16.1.114 RewriteEngine on RewriteRule ^/test$ /index.php I've tried the rewrite rule on another server and it works as expected. No errors are thrown to my apache error log and it restarts cleanly. When I try the page it 404s and doesn't load index.php I'm sure this must be a simple problem, but I am at a loss on how to figure it out. Any help is appreciated.

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