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  • Actor library / framework for C++

    - by Giorgio
    In the C++ project I am working for we would like to use something like Scala actors and remote actors (see e.g. this tutorial). Being able to use remote actors (actors living in different processes, possibly on different machines and communicating via TCP/IP) has higher priority for us because we have an application consisting of several processes deployed on different machines. Being able to use several actors living in the same process (possibly different threads) is also interesting, but has lower priority for the moment. On wikipedia I have found some links to actor libraries for C++ and I have started to look at Theron. Before I dive too deep into the details and build an extended example with Theron, I wanted to ask if anybody has experience with any of these libraries and which one they would recommend.

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  • Software Center empty "No usefulness from server" "no username in config file"

    - by Theron G. Burrough
    I upgraded to 12.04 LTS and ran Software Center while a few things were running, and crashed. (2 GB RAM on a Netbook.) On reboot, Ubuntu One interface would not find any programs, neither installed (to run) nor available for download. So I launched Software Center, which opens, but does nothing. I click "Close" button and get a "Force Quit?" box. So I quit. Did research, learned to run Software Center from Terminal: 2012-04-29 23:14:36,978 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file Then tried the below without success: Reinstallation of software center: sudo apt-get install --reinstall software-center Didn't work. Found this in a post: remove the config file for software-center then log out and back in sudo rm -rf ~/.config/software-center Didn't work. Reinstalled Software Center with Synaptic Package Manager. Still no dice! And I am a Linux newbie, so I don't know where the Dickens that config file is. Help appreciated.

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  • GLX on NVIDIA OPTIMUS, Ubuntu 12.04

    - by Gabriel Theron
    I have a laptop that has an NVIDIA Optimus graphic card setup. I have tried running Minecraft on that laptop, and the game crashes after login, with the following error: org.lwjgl.LWJGLException: Could not init GLX I tried to update my drivers, but no driver update was available. I searched for people asking the same question and I found none, hence the following question: Is it possible to enable GLX on NVIDIA Optimus? If yes, how to? Thank you in advance.

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  • Performance of concurrent software on multicore processors

    - by Giorgio
    Recently I have often read that, since the trend is to build processors with multiple cores, it will be increasingly important to have programming languages that support concurrent programming in order to better exploit the parallelism offered by these processors. In this respect, certain programming paradigms or models are considered well-suited for writing robust concurrent software: Functional programming languages, e.g. Haskell, Scala, etc. The actor model: Erlang, but also available for Scala / Java (Akka), C++ (Theron, Casablanca, ...), and other programming languages. My questions: What is the state of the art regarding the development of concurrent applications (e.g. using multi-threading) using the above languages / models? Is this area still being explored or are there well-established practices already? Will it be more complex to program applications with a higher level of concurrency, or is it just a matter of learning new paradigms and practices? How does the performance of highly concurrent software compare to the performance of more traditional software when executed on multiple core processors? For example, has anyone implemented a desktop application using C++ / Theron, or Java / Akka? Was there a boost in performance on a multiple core processor due to higher parallelism?

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  • Google Chrome "warn to quit" not warning on Cmd + Tab quit

    - by Theron Luhn
    As a Mac poweruser, I often use Cmd + Tab to switch between applications. Tab is unfortunately close to Q, so I often end up jamming Cmd + Q as well by accident. On most applications, this isn't a problem; a popup appears confirming if I want to quit, and I just click "cancel." However, this isn't the case with Google Chrome. I checked "warn before quitting", and when I press Cmd + Q a box saying "Hold Cmd + Q to quit" pops up. But when jamming Cmd + Q while switching to Chrome using Cmd + Tab, it completely ignores the "warn before quitting" policy and quits immediately. Any way to fix this annoyance? Switching either of the shortcuts to something else would fix the problem, but I'm not able to find a way to do so.

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  • Accessing localhost:8080 through local network

    - by Theron Luhn
    I'm developing a Python WSGI website. I'm running a Paste development server on my Mac (OS X 10.7) on port 8080. I want to test the website on some other devices and OSs I have connected to the local network (Windows 7 VM, iPad, iPhone, etc.), but am having trouble. I turned on Web Sharing, and am able to access that (port 80) without a problem on all my devices. Port 8080 still doesn't work. An excerpt from my Paste configuration: [server:main] use = egg:waitress#main host = 127.0.0.1 port = 8080 The OS X firewall (Settings - Security - Firewall) is off. I have no other firewall software installed. My network is through a Linksys WRT160N router. I haven't done much with the settings, so most of them are at their defaults. I've been Googling all morning, but can't find a solution.

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  • A detail question when applying genetic algorithm to traveling salesman

    - by burrough
    I read various stuff on this and understand the principle and concepts involved, however, none of paper mentions the details of how to calculate the fitness of a chromosome (which represents a route) involving adjacent cities (in the chromosome) that are not directly connected by an edge (in the graph). For example, given a chromosome 1|3|2|8|4|5|6|7, in which each gene represents the index of a city on the graph/map, how do we calculate its fitness (i.e. the total sum of distances traveled) if, say, there is no direct edge/link between city 2 and 8. Do we follow some sort of greedy algorithm to work out a route between 2 and 8, and add the distance of this route to the total? This problem seems pretty common when applying GA to TSP. Anyone who's done it before please share your experience. Thanks.

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  • How do i put this chunk of code into a php variable?

    - by Theron Chong
    if (isset($_SESSION['name'])){ //select BID and duedates which are between the range of 1-3 days // before due date from current date $query = "SELECT DueDate FROM item WHERE DueDate BETWEEN '$warning2' and '$warning' and user='$_SESSION[name]' ORDER BY DueDate DESC"; $find = mysql_query($query); $alert = mysql_num_rows($find); if ($alert>=1){ echo "You have got " .$alert. " item(s) due on: </br >"; while ($item = mysql_fetch_array($find)){ echo $item['DueDate']; echo "<br />"; } } echo "Success!"; } Question: How do i input all this code into a single php variable, say $alert. I am not clear of where to put single quotes or double quotes to make it work. At the end of the day, I will be using the variable for a javascript alert box.

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  • jQuery : how to manipulate indexes?

    - by Gabriel Theron
    Should not be such a hard question... I'm just having a hard time figuring out how to make operations on some jquery elements, particularly their indexes. Teh codez: $( "#docSlider" ).css("background-image", "url(../../bundles/mypath/images/maquette/img" + $( "#selectable li" ).index( this ) + (".jpg)")); I want to make the name of the picture I load depend on the index of a jQuery selectable. So I grab the index and try to add 1... but it can't work because "+" is also a concatenator. I've tried to parseInt as well, but it was always worth 0. How do I simply transform the index to an integer and then concatenate it with the rest of the string? Thank you in advance! Edit : I'm using a function that already exists, so I can hardly change the parameters (well, I guess I can't...)

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