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  • What is a normal value for pages/sec on a Windows Server 2003 Web Server?

    - by Emil Lerch
    I know the answer to this is "it depends", and I know that the counter can and will be thrown off by backup jobs or other things that might use memory mapped files. I'd like to get a bit of clarity over exactly what "it depends" on and some general guidelines around what a healthy web server normally shows for this counter. So if activities regarding memory-mapped files are excluded, if I have ample amounts of memory, should I really see this down close to 0? When should I get suspicious that I might need additional RAM and/or start looking for application memory leaks?

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  • Xampp installation

    - by Bernavi Spain
    I get some troubles when I want to install the xampp tool, I run the command sudo apt-get install xampp and this is what I get in return Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: xampp:i386 : Depends: python-gtk2:i386 but it is not going to be installed Depends: python-glade2:i386 but it is not going to be installed E: Unable to correct problems, you have held broken packages. Im using linux mint maya cinnamon

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  • Installing PHP Imagick with libmagickcore4

    - by Ali
    I have ImageMagick (version 6.6.9-7) on Ubuntu 12.04, which has libmagickcore4. When I tried to install PHP imagick, I received the following error: The following packages have unmet dependencies: php5-imagick : Depends: libmagickcore3 (>= 8:6.6.0.4) but it is not installable Depends: libmagickwand3 (>= 8:6.6.0.4) but it is not installable E: Unable to correct problems, you have held broken packages. Apparently, the problem is that php5-imagick is based on libmagickcore3 but a newer verion has been installed on my Ubuntu. Is there a way to instruct PHP imagick to use libmagickcore4?

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  • How can I install a headless JDK on an Ubuntu Jaunty server?

    - by Hanno Fietz
    I recently set up a build server that requires a JDK to run (for example, to compile the Java sources). The OpenJDK package in Ubuntu pulls in the OpenJDK JRE as a dependency which, in turn, depends on a large number of packages that are only relevant for graphical environments. For the standard JRE, there's a headless version of the package, but for the JDK, no. This issue has been discussed in various places before, and one solution that I found and used was this: $ apt-get --no-install-recommends -d install openjdk-6-jdk $ dpkg -i --ignore-depends=openjdk-6-jre /path/to/just-downloaded.deb While this worked, it now leaves my system with a broken dependency tree and apt-get refuses further installs untill I run apt-get -f. Is there a better solution to this?

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  • Cannot start `Routing and Remote Access Service` and it's dependencies

    - by ahmadali shafiee
    I tried to start Routing and Remote Access Service but I've got an error says the dependency service or group failed to start then I tried to start Remote Access Connection Manager (one of RRAS's dependencies) and the error way same. then I tried to start The Secure Socket Tuning Protocol Service but there was an error says that the the service started then stopped! the errors form event log is here: The Remote Access Connection Manager service depends on the Secure Socket Tunneling Protocol Service service which failed to start because of the following error: The operation completed successfully. The Secure Socket Tunneling Protocol Service service entered the stopped state. The Routing and Remote Access service depends on the Remote Access Connection Manager service which failed to start because of the following error: The dependency service or group failed to start. sort by date Does anyone know how can I resolve the problem?

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  • ubuntu package dependency error

    - by Sabareesh Kkanan
    Webmin was upgrading packages and something went wrong after that and now i cannot install anything. Even my apache server is down . When i type apt-get install apache2 i get this error The following packages have unmet dependencies: apache2 : Depends: apache2-mpm-worker (= 2.2.22-6ubuntu2.3) but it is not going to be installed or apache2-mpm-prefork (= 2.2.22-6ubuntu2.3) but it is not going to be installed or apache2-mpm-event (= 2.2.22-6ubuntu2.3) but it is not going to be installed or apache2-mpm-itk (= 2.2.22-6ubuntu2.3) but it is not going to be installed Depends: apache2.2-common (= 2.2.22-6ubuntu2.3) but it is not going to be installed E: Unable to correct problems, you have held broken packages. then i ran apt-get dist-upgrade and got this The following packages have been kept back: libtiff4 libxml2 rpm-common 0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded. please help

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  • debian dependencies (libssl-dev and libncurses5)

    - by RubyFreak
    I'm trying to install under RVM the Ruby Enterpise (REE) under debian My debian is squeeze (uname -r) 2.6.18-194.26.1.el5.028stab070.14xen i did try to install ree but it complains that it is missing libssl-dev and libreadline5-dev. I did update my lenny to squeeze, but i didn't update the kernel, since its a production server. The operational system is already updated and upgraded sources.list: deb http://ftp.de.debian.org/debian/ squeeze main contrib non-free deb-src http://ftp.de.debian.org/debian/ squeeze main contrib non-free deb http://security.debian.org/ squeeze/updates main deb-src http://security.debian.org/ squeeze/updates main I did try to install it using the following command: apt-get install libssl-dev libreadline5-dev But unfortunately i'm getting the following problems: The following packages have unmet dependencies: libreadline5-dev: Depends: libncurses5-dev but it is not going to be installed libssl-dev: Depends: libssl0.9.8 (= 0.9.8o-4squeeze1) but 0.9.8o-6 is to be installed E: Broken packages I was thinking to reinstall those packages and install again, but it has too many dependencies, and it is a production server, that i would like to know if there is any other way to fix it. Or at least to double check if it is necessary to reinstall both :-/

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  • Applications not installing due to unmet dependencies

    - by Vineet Sharma
    I was running Apache on Linode. I recently shifted to Lighttpd and removed apache, now whenever I try to install any application I get the following error. ivineet:~# apt-get install subversion Reading package lists... Done Building dependency tree Reading state information... Done You might want to run `apt-get -f install' to correct these: The following packages have unmet dependencies: libapache2-mod-php5: Depends: apache2-mpm-prefork (> 2.0.52) but it is not going to be installed or apache2-mpm-itk but it is not going to be installed subversion: Depends: libsvn1 (= 1.6.12dfsg-6) but it is not going to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). ivineet:~#

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  • Installing cURL on Ubuntu

    - by davykiash
    Am trying to install cURL on my ubuntu server using the command sudo apt-get install php5-curl However i get the following error Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: php5-curl: Depends: phpapi-20060613+lfs Depends: php5-common (= 5.2.6.dfsg.1-3ubuntu4.5) but 5.3.2-0.dotdeb.1 is to be installed E: Broken packages I am running PHP Version 5.3.2-0.dotdeb.1 on my server. Whats the issue? I need to get curl up and running.

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  • Which interface defines the physical address of a Dialup connection

    - by Debabratta
    I use dial up connection to connect to the Internet. When I type ipconfig/all in the command prompt it shows me a physical address along with description for the dial up connection. The description field shows WAN(PPP/SLIP)Interface. I want to know upon which this physical address depends? It depends on my computer or ISP. On changing my ISP, physical address for this dialup connection will change or remain same? Please give some idea.

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  • ANT: ways to include libraries and license issues

    - by Eric Tobias
    I have been trying to use Ant to compile and ready a project for distribution. I have encountered several problems along the way that I have been finally able to solve but the solution leaves me very unsatisfied. First, let me explain the set-up of the project and its dependencies. I have a project, lets call it Primary which depends on a couple of libraries such as the fantastic Guava. It also depends on another project of mine, lets call it Secondary. The Secondary project also features some dependencies, for example, JDOM2. I have referenced the Jar I build with Ant in Primary. Let me give you the interesting bits of the build.xml so you can get a picture of what I am doing: <project name="Primary" default="all" basedir="."> <property name='build' location='dist' /> <property name='application.version' value='1.0'/> <property name='application.name' value='Primary'/> <property name='distribution' value='${application.name}-${application.version}'/> <path id='compile.classpath'> <fileset dir='libs'> <include name='*.jar'/> </fileset> </path> <target name='compile' description='Compile source files.'> <javac includeantruntime="false" srcdir="src" destdir="bin"> <classpath refid='compile.classpath'/> </javac> <target> <target name='jar' description='Create a jar file for distribution.' depends="compile"> <jar destfile='${build}/${distribution}.jar'> <fileset dir="bin"/> <zipgroupfileset dir="libs" includes="*.jar"/> </jar> </target> The Secodnary project's build.xml is nearly identical except that it features a manifest as it needs to run: <target name='jar' description='Create a jar file for distribution.' depends="compile"> <jar destfile='${dist}/${distribution}.jar' basedir="${build}" > <fileset dir="${build}"/> <zipgroupfileset dir="libs" includes="*.jar"/> <manifest> <attribute name="Main-Class" value="lu.tudor.ssi.kiss.climate.ClimateChange"/> </manifest> </jar> </target> After I got it working, trying for many hours to not include that dependencies as class files but as Jars, I don't have the time or insight to go back and try to figure out what I did wrong. Furthermore, I believe that including these libraries as class files is bad practice as it could give rise to licensing issues while not packaging them and merely including them in a directory along the build Jar would most probably not (And if it would you could choose not to distribute them yourself). I think my inability to correctly assemble the class path, I always received NoClassDefFoundError for classes or libraries in the Primary project when launching Second's Jar, is that I am not very experienced with Ant. Would I require to specify a class path for both projects? Specifying the class path as . should have allowed me to simply add all dependencies to the same folder as Secondary's Jar, should it not?

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  • When should I use Areas in TFS instead of Team Projects

    - by Martin Hinshelwood
    Well, it depends…. If you are a small company that creates a finite number of internal projects then you will find it easier to create a single project for each of your products and have TFS do the heavy lifting with reporting, SharePoint sites and Version Control. But what if you are not… Update 9th March 2010 Michael Fourie gave me some feedback which I have integrated. Ed Blankenship via @edblankenship offered encouragement and a nice quote. Ewald Hofman gave me a couple of Cons, and maybe a few more soon. Ewald’s company, Avanade, currently uses Areas, but it looks like the manual management is getting too much and the project is getting cluttered. What if you are likely to have hundreds of projects, possibly with a multitude of internal and external projects? You might have 1 project for a customer or 10. This is the situation that most consultancies find themselves in and thus they need a more sustainable and maintainable option. What I am advocating is that we should have 1 “Team Project” per customer, and use areas to create “sub projects” within that single “Team Project”. "What you describe is what we generally do internally and what we recommend. We make very heavy use of area path to categorize the work within a larger project." - Brian Harry, Microsoft Technical Fellow & Product Unit Manager for Team Foundation Server   "We tend to use areas to segregate multiple projects in the same team project and it works well." - Tiago Pascoal, Visual Studio ALM MVP   "In general, I believe this approach provides consistency [to multi-product engagements] and lowers the administration and maintenance costs. All good." - Michael Fourie, Visual Studio ALM MVP   “@MrHinsh BTW, I'm very much a fan of very large, if not huge, team projects in TFS. Just FYI :) Use Areas & Iterations.” Ed Blankenship, Visual Studio ALM MVP   This would mean that SSW would have a single Team Project called “SSW” that contains all of our internal projects and consequently all of the Areas and Iteration move down one hierarchy to accommodate this. Where we would have had “\SSW\Sprint 1” we now have “\SSW\SqlDeploy\Sprint1” with “SqlDeploy” being our internal project. At the moment SSW has over 70 internal projects and more than 170 total projects in TFS. This method has long term benefits that help to simplify the support model for companies that often have limited internal support time and many projects. But, there are implications as TFS does not provide this model “out-of-the-box”. These implications stretch across Areas, Iterations, Queries, Project Portal and Version Control. Michael made a good comment, he said: I agree with your approach, assuming that in a multi-product engagement with a client, they are happy to adopt the same process template across all products. If they are not, then it’ll either be easy to convince them or there is a valid reason for having a different template - Michael Fourie, Visual Studio ALM MVP   At SSW we have a standard template that we use and this is applied across the board, to all of our projects. We even apply any changes to the core process template to all of our existing projects as well. If you have multiple projects for the same clients on multiple templates and you want to keep it that way, then this approach will not work for you. However, if you want to standardise as we have at SSW then this approach may benefit you as well. Implications around Areas Areas should be used for topological classification/isolation of work items. You can think of this as architecture areas, organisational areas or even the main features of your application. In our scenario there is an additional top level item that represents the Project / Product that we want to chop our Team Project into. Figure: Creating a sub area to represent a product/project is easy. <teamproject> <teamproject>\<Functional Area/module whatever> Becomes: <teamproject> <teamproject>\<ProjectName>\ <teamproject>\<ProjectName>\<Functional Area/module whatever> Implications around Iterations Iterations should be used for chronological classification/isolation of work items. This could include isolated time boxes, milestones or release timelines and really depends on the logical flow of your project or projects. Due to the new level in Area we need to add the same level to Iteration. This is primarily because it is unlikely that the sprints in each of your projects/products will start and end at the same time. This is just a reality of managing multiple projects. Figure: Adding the same Area value to Iteration as the top level item adds flexibility to Iteration. <teamproject>\Sprint 1 Or <teamproject>\Release 1\Sprint 1 Becomes: <teamproject>\<ProjectName>\Sprint 1 Or <teamproject>\<ProjectName>\Release 1\Sprint 1 Implications around Queries Queries are used to filter your work items based on a specified level of granularity. There are a number of queries that are built into a project created using the MSF Agile 5.0 template, but we now have multiple projects and it would be a pain to have to edit all of the work items every time we changed project, and that would only allow one team to work on one project at a time.   Figure: The Queries that are created in a normal MSF Agile 5.0 project do not quite suit our new needs. In order for project contributors to be able to query based on their project we need a couple of things. The first thing I did was to create an “_Area Template” folder that has a copy of the project layout with all the queries setup to filter based on the “_Area Template” Area and the “_Sprint template” you can see in the Area and Iteration views. Figure: The template is currently easily drag and drop, but you then need to edit the queries to point at the right Area and Iteration. This needs a tool. I then created an “Areas” folder to hold all of the area specific queries. So, when you go to create a new TFS Sub-Project you just drag “_Area Template” while holding “Ctrl” and drop it onto “Areas”. There is a little setup here. That said I managed it in around 10 minutes which is not so bad, and I can imagine it being quite easy to build a tool to create these queries Figure: These new queries can be configured in around 10 minutes, which includes setting up the Area and Iteration as well. Version Control What about your source code? Well, that is the easiest of the lot. Just create a sub folder for each of your projects/products.   Figure: Creating sub folders in source control is easy as “Right click | Create new folder”. <teamproject>\DEV\Main\ Becomes: <teamproject>\<ProjectName>\DEV\Main\ Conclusion I think it is up to each company to make a call on how you want to configure your Team Projects and it depends completely on how many projects/products you are going to have for each customer including yourself. If we decide to utilise this route it will require some configuration to get our 170+ projects into this format, and I will probably be writing some tools to help. Pros You only have one project to upgrade when a process template changes – After going through an upgrade of over 170 project prior to the changes in the RC I can tell you that that many projects is no fun. Standardises your Process Template – You will always have the same Process implementation across projects/products without exception You get tighter control over the permissions – Yes, you can do this on a standard Team Project, but it gets a lot easier with practice. You can “move” work items from one “product” to another – Have we not always wanted to do that. You can rename your projects – Wahoo: everyone wants to do this, now you can. One set of Reporting Services reports to manage – You set an area and iteration to run reports anyway, so you may as well set both. Simplified Check-In Policies– There is only one set of check-in policies per client. This simplifies administration of policies. Simplified Alerts – As alerts are applied across multiple projects this simplifies your alert rules as per client. Cons All of these cons could be mitigated by a custom tool that helps automate creation of “Sub-projects” within Team Projects. This custom tool could create areas, Iteration, permissions, SharePoint and queries. It just does not exist yet :) You need to configure the Areas and Iterations You need to configure the permissions You may need to configure sub sites for SharePoint (depends on your requirement) – If you have two projects/products in the same Team Project then you will not see the burn down for each one out-of-the-box, but rather a cumulative for the Team Project. This is not really that much of a problem as you would have to configure your burndown graphs for your current iteration anyway. note: When you create a sub site to a TFS linked portal it will inherit the settings of its parent site :) This is fantastic as it means that you can easily create sub sites and then set the Area and Iteration path in each of the reports to be the correct one. Every team wants their own customization (via Ewald Hofman) - small teams of 2 persons against teams of 30 – or even outsourcing – need their own process, you cannot allow that because everybody gets the same work item types. note: Luckily at SSW this is not a problem as our template is standardised across all projects and customers. Large list of builds (via Ewald Hofman) – As the build list in Team Explorer is just a flat list it can get very cluttered. note: I would mitigate this by removing any build that has not been run in over 30 days. The build template and workflow will still be available in version control, but it will clean the list. Feedback Now that I have explained this method, what do you think? What other pros and cons can you see? What do you think of this approach? Will you be using it? What tools would you like to support you?   Technorati Tags: Visual Studio ALM,TFS Administration,TFS,Team Foundation Server,Project Planning,TFS Customisation

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  • Unable to uninstall maas completely

    - by user210844
    I'm not able to uninstall MAAS sudo apt-get purge maas ; sudo apt-get autoremove Reading package lists... Done Building dependency tree Reading state information... Done Package 'maas' is not installed, so not removed 0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded. 2 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Setting up maas-region-controller (1.2+bzr1373+dfsg-0ubuntu1) ... Considering dependency proxy for proxy_http: Module proxy already enabled Module proxy_http already enabled Module expires already enabled Module wsgi already enabled sed: -e expression #1, char 91: unterminated `s' command dpkg: error processing maas-region-controller (--configure): subprocess installed post-installation script returned error exit status 1 No apport report written because MaxReports is reached already dpkg: dependency problems prevent configuration of maas-dns: maas-dns depends on maas-region-controller (= 1.2+bzr1373+dfsg-0ubuntu1); however: Package maas-region-controller is not configured yet. dpkg: error processing maas-dns (--configure): dependency problems - leaving unconfigured No apport report written because MaxReports is reached already Errors were encountered while processing: maas-region-controller maas-dns E: Sub-process /usr/bin/dpkg returned an error code (1) Reading package lists... Done Building dependency tree Reading state information... Done 0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded. 2 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Setting up maas-region-controller (1.2+bzr1373+dfsg-0ubuntu1) ... Considering dependency proxy for proxy_http: Module proxy already enabled Module proxy_http already enabled Module expires already enabled Module wsgi already enabled sed: -e expression #1, char 91: unterminated `s' command dpkg: error processing maas-region-controller (--configure): subprocess installed post-installation script returned error exit status 1 No apport report written because MaxReports is reached already dpkg: dependency problems prevent configuration of maas-dns: maas-dns depends on maas-region-controller (= 1.2+bzr1373+dfsg-0ubuntu1); however: Package maas-region-controller is not configured yet. dpkg: error processing maas-dns (--configure): dependency problems - leaving unconfigured No apport report written because MaxReports is reached already Errors were encountered while processing: maas-region-controller maas-dns E: Sub-process /usr/bin/dpkg returned an error code (1)

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  • /users/tags should contain scores

    - by Sean Patrick Floyd
    I am implementing some simple JavaScript/bookmarklet based apps that show some reputation info, including the score in the User's top tags (roughly based on this previous bookmarklet of mine). Now I can get a user's top tags (using the API), and I can also get the per-tag score if the user is logged in, by dynamically parsing the tag's top users page. But it costs me one AJAX request per tag and I have to download 10+k to extract a single numeric value. It would save a lot of traffic if the tags in <api>/users/<userid>/tags had a score field. The data seems to be there, after all the top users pages use it, so it would just be a question of exposing the data. Suggested structure: "tags": [ { "name": { "description": "name of the tag", "values": "string", "optional": false, "suggested_buffer_size": 25 }, "score": { "description": "tag score, sum of up votes for answers on non-wiki questions", "values": "32-bit signed integer", "optional": false }, "count": { "description": "tag count, exact meaning depends on context", "values": "32-bit signed integer", "optional": false }, "restricted_to": { "description": "user types that can make use of this tag, lack of this field indicates it is useable by all", "values": "one of anonymous, unregistered, registered, or moderator", "optional": true }, "fulfills_required": { "description": "indicates whether this tag is one of those that is required to be on a post", "values": "boolean", "optional": false }, "user_id": { "description": "user associated with this tag, depends on context", "values": "32-bit signed integer", "optional": true } } ]

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  • Problem after mysql-server installation I cant install any thing in ubuntu 12.04.1 now

    - by mohammed ezzi
    I'm not an advanced user of Linux and I tried to install work with database so I installed Mysql-server, I think I did same thing wrong so I get in trouble and now I cant install any thing and this what I get when I use apt-get -f install : root@me:~# apt-get -f install Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following extra packages will be installed: mysql-server mysql-server-5.5 Suggested packages: tinyca mailx The following packages will be upgraded: mysql-server mysql-server-5.5 2 upgraded, 0 newly installed, 0 to remove and 194 not upgraded. 2 not fully installed or removed. Need to get 0 B/8,737 kB of archives. After this operation, 15.4 kB of additional disk space will be used. Do you want to continue [Y/n]? y dpkg: dependency problems prevent configuration of mysql-server-5.5: mysql-server-5.5 depends on mysql-server-core-5.5 (= 5.5.24-0ubuntu0.12.04.1); however: Version of mysql-server-core-5.5 on system is 5.5.28-0ubuntu0.12.04.3. dpkg: error processing mysql-server-5.5 (--configure): dependency problems - leaving unconfigured No apport report written because MaxReports is reached already dpkg: dependency problems prevent configuration of mysql-server: mysql-server depends on mysql-server-5.5; however: Package mysql-server-5.5 is not configured yet. dpkg: error processing mysql-server (--configure): dependency problems - leaving unconfigured No apport report written because MaxReports is reached already Errors were encountered while processing: mysql-server-5.5 mysql-server E: Sub-process /usr/bin/dpkg returned an error code (1) I tried to remove mysql-server but nothing happened.

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  • Trouble installing Rabbit VCS for nautilus

    - by Ranhiru Cooray
    I am using Ubuntu 11.10 and following instructions mentioned here to install Rabbit VCS. I added the PPA properly, did a sudo apt-get update and ran sudo apt-get install rabbitvcs-core rabbitvcs-nautilus rabbitvcs-thunar rabbitvcs-gedit rabbitvcs-cli There were dependency issues and I googled a bit and found out that I need to install RabbitVCS only for nautilus as that is the default file manager for Ubuntu. So I ran the install commands separately for rabbitvcs-core, rabbitvcs-gedit and rabbitvcs-cli. Now my understanding is that those are installed properly. However when I run the install command for rabbitvcs-nautilus, I still get a dependency issue. ranhiru@ranhiru-HP-HDX16-NoteBook-PC:~$ sudo apt-get install rabbitvcs-nautilus Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: rabbitvcs-nautilus : Depends: nautilus (< 1:3.0~) but 1:3.2.1-0ubuntu2 is to be installed Depends: python-nautilus (< 1.0~) but 1.0-0ubuntu2 is to be installed E: Unable to correct problems, you have held broken packages. How do I solve this?

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  • Interpolate air drag for my game?

    - by Valentin Krummenacher
    So I have a little game which works with small steps, however those steps vary in time, so for example I sometimes have 10 Steps/second and then I have 20 Steps/second. This changes automatically depending on how many steps the user's computer can take. To avoid inaccurate positioning of the game's player object I use y=v0*dt+g*dt^2/2 to determine my objects y-position, where dt is the time since the last step, v0 is the velocity of my object in the beginning of my step and g is the gravity. To calculate the velocity in the end of a step I use v=v0+g*dt what also gives me correct results, independent of whether I use 2 steps with a dt of for example 20ms or one step with a dt of 40ms. Now I would like to introduce air drag. For simplicity's sake I use a=k*v^2 where a is the air drag's acceleration (I am aware that it would usually result in a force, but since I assume 1kg for my object's mass the force is the same as the resulting acceleration), k is a constant (in this case I'm using 0.001) and v is the speed. Now in an infinitely small time interval a is k multiplied by the velocity in this small time interval powered by 2. The problem is that v in the next time interval would depend on the drag of the last which again depends on the v of the last interval and so on... In other words: If I use a=k*v^2 I get different results for my position/velocity when I use 2 steps of 20ms than when I use one step of 40ms. I used to have this problem for my position too, but adding +g*dt^2/2 to the formula for my position fixed the problem since it takes into account that the position depends on the velocity which changes slightly in every infinitely small time interval. Does something like that exist for air drag too? And no, I dont mean anything like Adding air drag to a golf ball trajectory equation or similar, for that kind of method only gives correct results when all my steps are the same. (I hope you can understand my intermediate english, it's not my main language so I would like to say sorry for all the silly mistakes I might have made in my question)

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  • DIVIDE vs division operator in #dax

    - by Marco Russo (SQLBI)
    Alberto Ferrari wrote an interesting article about DIVIDE performance in DAX. This new function has been introduced in SQL Server Analysis Services 2012 SP1, so it is available also in Excel 2013 (which still doesn’t have other features/fixes introduced by following Cumulative Updates…). The idea that instead of writing: IF ( Sales[Quantity] <> 0, Sales[Amount] / Sales[Quantity], BLANK () ) you can write: DIVIDE ( Sales[Amount], Sales[Quantity] ) There is a third optional argument in DIVIDE that defines the result in case the denominator (second argument) is zero, and by default its value is BLANK, so I omitted the third argument in my example. Using DIVIDE is very important, especially when you use a measure in MDX (for example in an Excel PivotTable) because it raise the chance that the non empty evaluation for the result is evaluated in bulk mode instead of cell-by-cell. However, from a DAX point of view, you might find it’s better to use the standard division operator removing the IF statement. I suggest you to read Alberto’s article, because you will find that an expression applying a filter using FILTER is faster than using CALCULATE, which is against any rule of thumb you might have read until now! Again, this is not always true, and depends on many conditions – trying to simplify, we might say that for a simple calculation, the query plan generated by FILTER could be more efficient – but, as usual, it depends, and 90% of the times using FILTER instead of CALCULATE produces slower performance. Do not take anything for granted, and always check the query plan when performance are your first issue!

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  • Can't install Apache 2.2.22 on Ubuntu 13.10

    - by B18C1
    My work environment requires Apache 2.2.22 instead of the latest version of 2.4. My machine is currently running Ubuntu 13.10. When I use Synaptic or apt-get it will not allow me to choose an older version of Apache than 2.4. So my question is, how can I force an install of Apache 2.2.22 on Ubuntu 13.10 using Synaptic or apt-get. When I do try to specify the version I get the following: sudo apt-get install apache2=2.2.22-1ubuntu1 [sudo] password for b18c1: Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: apache2 : Depends: apache2-mpm-worker (= 2.2.22-1ubuntu1) but it is not going to installed or apache2-mpm-prefork (= 2.2.22-1ubuntu1) but it is not going to be installed or apache2-mpm-event (= 2.2.22-1ubuntu1) but it is not going to be installed or apache2-mpm-itk (= 2.2.22-1ubuntu1) but it is not going to be installed Depends: apache2.2-common (= 2.2.22-1ubuntu1) but it is not going to be installed E: Unable to correct problems, you have held broken packages.

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  • Plymouth package broken... Can I safely remove it? Other solution to repare it?

    - by Julien Gorenflot
    I have a broken package... So far nothing horrible. The problem is that it is Plymouth, and it seems that if I remove it, I will remove half of the packages of my system... So here is my question: if I actually remove, or even purge plymouth; will I at least have a terminal left after it to reinstall it? Or am I definitely doomed? Just to illustrate what I say; here is the result of an apt-get --reinstall install plymouth: julien@julien-desktop:~$ sudo apt-get --reinstall install plymouth Reading package lists... Done Building dependency tree Reading state information... Done Reinstallation of plymouth is not possible, it cannot be downloaded. You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies: plymouth : Depends: libdrm-nouveau1 (>= 2.4.11-1ubuntu1~) but it is not installable Recommends: plymouth-themes-all but it is not installable E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). or an apt-get -f install (well basically it is the same) julien@julien-desktop:~$ sudo apt-get -f install [sudo] password for julien: Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... failed. The following packages have unmet dependencies: plymouth : Depends: libdrm-nouveau1 (>= 2.4.11-1ubuntu1~) but it is not installable Recommends: plymouth-themes-all but it is not installable E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages. E: Unable to correct dependencies julien@julien-desktop:~$ Any idea would be very welcome...

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  • dpkg behaving strangely?

    - by Tom Henderson
    When I use apt to get a package, I have been receiving the same error message. Here is an example trying to install wicd (which is already installed): Reading package lists... Building dependency tree... Reading state information... wicd is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded. 3 not fully installed or removed. After this operation, 0B of additional disk space will be used. Setting up tex-common (2.06) ... debconf: unable to initialize frontend: Dialog debconf: (Dialog frontend requires a screen at least 13 lines tall and 31 columns wide.) debconf: falling back to frontend: Readline Running mktexlsr. This may take some time... done. No packages found matching texlive-base. dpkg: error processing tex-common (--configure): subprocess installed post-installation script returned error exit status 1 dpkg: dependency problems prevent configuration of texlive-binaries: texlive-binaries depends on tex-common (>= 2.00); however: Package tex-common is not configured yet. dpkg: error processing texlive-binaries (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of dvipng: dvipng depends on texlive-base-bin; however: Package texlive-base-bin is not installed. Package texlive-binaries which provides texlive-base-bin is not configured yet. dpkg: error processing dvipng (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. No apport report written because the error message indicates its a followup error from a previous failure. Errors were encountered while processing: tex-common texlive-binaries dvipng E: Sub-process /usr/bin/dpkg returned an error code (1) I'm not sure if this is a problem with apt or with dpkg, but it certainly doesn't look good!

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  • How can I roll back xserver-xorg-core and xserver-common?

    - by Ville Sundberg
    A recent update to Xorg broke my desktop, which now looks like this: http://i.imgur.com/PbBxh.jpg In short, the desktop background is not updating on the secondary display. (And if there is no secondary display, the primary display background stops updating.) Looking into the history, I found that this happened right after upgrading two packages: xserver-xorg-core xserver-common These were upgraded to 1.9.0-0ubuntu7.3. I'd like to downgrade these packages. How do I do that? I've checked that both have another version in the maverick repo: xserver-xorg-core: Installed: 2:1.9.0-0ubuntu7.3 Candidate: 2:1.9.0-0ubuntu7.3 Version table: *** 2:1.9.0-0ubuntu7.3 0 500 http://fi.archive.ubuntu.com/ubuntu/ maverick-updates/main amd64 Packages 100 /var/lib/dpkg/status 2:1.9.0-0ubuntu7 0 500 http://fi.archive.ubuntu.com/ubuntu/ maverick/main amd64 Packages However, apt won't let me downgrade them: ville@fluxx ~ % sudo apt-get install xserver-common=2:1.9.0-0ubuntu7 xserver-xorg-core=2:1.9.0-0ubuntu7 The following packages have unmet dependencies: xserver-xorg-core : Depends: xserver-xorg but it is not going to be installed E: Broken packages And this is the reason: ville@fluxx ~ % sudo apt-get install xserver-common=2:1.9.0-0ubuntu7 xserver-xorg-core=2:1.9.0-0ubuntu7 xserver-xorg-core The following packages have unmet dependencies: xserver-xorg-core : Depends: xserver-common (>= 2:1.9.0-0ubuntu7.3) but 2:1.9.0-0ubuntu7 is to be installed E: Broken packages Am I out of options here?

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  • Persistent "held broken packages" error

    - by stoplan
    sudo apt-get update && sudo apt-get install netflix-desktop gives the error The following packages have unmet dependencies: netflix-desktop : Depends: wine-browser-installer but it is not going to be installed E: Unable to correct problems, you have held broken packages. but dpkg --get-selections | grep hold shows nothing. I'm running 12.04 64-bit. I've followed the directions in How do I resolve unmet dependencies?: Confirmed that main, universe, restricted and multiverse software sources are enabled sudo apt-get clean sudo apt-get -f install (returning '0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.') sudo dpkg --configure -a sudo apt-get -f install (again '0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.) sudo apt-get -u dist-upgrade (0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.) used Y PPA Manager to check for duplicate ppas (none found) [Edit] I have had the same error with other packages. Here's the output requested by Alaa: sudo apt-get install wine-browser-installer Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: wine-browser-installer : Depends: wine-compholio (= 1.5.19~precise1) E: Unable to correct problems, you have held broken packages.

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  • Ubuntu Upgrade breaks firefox

    - by Dennis
    I upgraded ubuntu, but the upgrade broke firefox, adobe flash plugin and corrupted the package database. I ran the suggested catalog repair, no change. I ran apt-get -f install, no change. I ran apt purge packageName, no change. How can I resolve this circular dependency? Here are some details: installArchives() failed: dpkg: dependency problems prevent configuration of adobe-flashplugin: firefox (12.0+build1-0ubuntu0.12.04.1) breaks adobe-flashplugin (<= 11.1.102.63-0precise1) and is installed. Version of adobe-flashplugin to be configured is 10.0.32.18-1intrepid1. dpkg: error processing adobe-flashplugin (--configure): dependency problems - leaving unconfigured No apport report written because MaxReports is reached already dpkg: dependency problems prevent configuration of adobe-flash-properties-gtk: adobe-flash-properties-gtk depends on adobe-flashplugin (= 11.2.202.235-0precise1); however: Version of adobe-flashplugin on system is 10.0.32.18-1intrepid1. dpkg: error processing adobe-flash-properties-gtk (--configure): dependency problems - leaving unconfigured No apport report written because MaxReports is reached already Errors were encountered while processing: adobe-flashplugin adobe-flash-properties-gtk Error in function: dpkg: dependency problems prevent configuration of adobe-flash-properties-gtk: adobe-flash-properties-gtk depends on adobe-flashplugin (= 11.2.202.235-0precise1); however: Version of adobe-flashplugin on system is 10.0.32.18-1intrepid1. dpkg: error processing adobe-flash-properties-gtk (--configure): dependency problems - leaving unconfigured

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  • libc-bin errors when trying to install php

    - by jonney
    i am trying to update and install php into my ubuntu server 12.04 using the command below: apt-get upgrade php apt-get install php5-curl php5-gd php5-mysql php5-pgsql However i receive this error all the time: gzip: stdout: No space left on device E: mkinitramfs failure cpio 141 gzip 1 update-initramfs: failed for /boot/initrd.img-3.2.0-34-generic with 1. run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1 Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/linux-image-3.2.0-34-generic.postinst line 1010. dpkg: error processing linux-image-3.2.0-34-generic (--configure): subprocess installed post-installation script returned error exit status 2 dpkg: dependency problems prevent configuration of linux-image-server: linux-image-server depends on linux-image-3.2.0-33-generic; however: Package linux-image-3.2.0-33-generic is not configured yet. dpkg: error processing linux-image-server (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of linux-server: linux-server depends on linux-image-server (= 3.2.0.33.36); however: Package linux-image-server is not configured yet. dpkg: error processing linux-server (--configure): dependency problems - leaving unconfigured Setting up libpq5 (9.1.10-0ubuntu12.04) ... No apport report written because the error message indicates it's a follow-up error from a previous failure. No apport report written because MaxReports has already been reached Setting up php5-curl (5.3.10-1ubuntu3.8) ... Setting up php5-pgsql (5.3.10-1ubuntu3.8) ... Processing triggers for initramfs-tools ... update-initramfs: Generating /boot/initrd.img-3.2.0-32-generic gzip: stdout: No space left on device E: mkinitramfs failure cpio 141 gzip 1 update-initramfs: failed for /boot/initrd.img-3.2.0-32-generic with 1. dpkg: error processing initramfs-tools (--configure): subprocess installed post-installation script returned error exit status 1 No apport report written because MaxReports has already been reached Processing triggers for libc-bin ... ldconfig deferred processing now taking place Errors were encountered while processing: linux-image-3.2.0-33-generic linux-image-3.2.0-34-generic linux-image-server linux-server initramfs-tools E: Sub-process /usr/bin/dpkg returned an error code (1) Not sure whats wrong and why it cant process the linux-image files?

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