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  • Nervous about the "real" world

    - by Randy
    I am currently majoring in Computer Science and minoring in mathematics (the minor is embedded in the major). The program has a strong C++ curriculum. We have done some UNIX and assembly language (not fun) and there is C and Java on the way in future classes that I must take. The program I am in did not use the STL, but rather a STL-ish design that was created from the ground up for the program. From what I have read on, the STL and what I have taken are very similar but what I used seemed more user friendly. Some of the programs that I had to write in C++ for assignments include: a password server that utilized hashing of the passwords for security purposes, a router simulator that used a hash table and maps, a maze solver that used depth first search, a tree traveler program that traversed a tree using levelorder, postorder, inorder, selection sort, insertion sort, bit sort, radix sort, merge sort, heap sort, quick sort, topological sort, stacks, queues, priority queues, and my least favorite, red-black trees. All of this was done in three semesters which was just enough time to code them up and turn them in. That being said, if I was told to use a stack to convert an equation to infix notation or something, I would be lost for a few hours. My main concern in writing this is when I graduate and land an interview, what are some of the questions posed to assess my skills? What are some of the most important areas of computer science that are prevalent in the field? I am currently trying to get some ideas of programs I can write in C++ that interest and challenge me to keep learning the language. A sodoku solver came to mind but am lost as to where to start. I apologize for the rant, but I'm just a wee bit nervous about the future. Any tips are appreciated.

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  • Problem running Qreator on Xubuntu-14.04

    - by Seyed Mohammad
    I installed Qreator using apt-get on Xubuntu-14.04: $ sudo apt-get install qreator But the application fails to start! When I try to run it via Terminal, the following error messages are printed and the program aborts: $ qreator ** (qreator:3859): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-Gh2FPHrMr2: Connection refused No handlers could be found for logger "qreator_lib" Traceback (most recent call last): File "/usr/bin/qreator", line 47, in <module> qreator.main() File "/usr/lib/python2.7/dist-packages/qreator/__init__.py", line 63, in main window = QreatorWindow.QreatorWindow() File "/usr/lib/python2.7/dist-packages/qreator_lib/Window.py", line 48, in __new__ new_object.finish_initializing(builder) File "/usr/lib/python2.7/dist-packages/qreator/QreatorWindow.py", line 79, in finish_initializing self.init_qr_types() File "/usr/lib/python2.7/dist-packages/qreator/QreatorWindow.py", line 135, in init_qr_types self.qr_types = [d(self.update_qr_code) for d in QRCodeType.dataformats] File "/usr/lib/python2.7/dist-packages/qreator/qrcodes/QRCodeType.py", line 71, in __init__ self.create_widget() # pylint: disable=E1101 File "/usr/lib/python2.7/dist-packages/qreator/qrcodes/QRCodeLocation.py", line 29, in create_widget self.widget = QRCodeLocationGtk(self.qr_code_update_func) File "/usr/lib/python2.7/dist-packages/qreator/qrcodes/QRCodeLocationGtk.py", line 49, in __init__ latitude, longitude = get_current_location() File "/usr/lib/python2.7/dist-packages/qreator/qrcodes/QRCodeLocationGtk.py", line 109, in get_current_location '/org/freedesktop/Geoclue/Providers/Hostip') File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object follow_name_owner_changes=follow_name_owner_changes) File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in __init__ self._named_service = conn.activate_name_owner(bus_name) File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in activate_name_owner self.start_service_by_name(bus_name) File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in start_service_by_name 'su', (bus_name, flags))) File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking message, timeout) dbus.exceptions.DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Geoclue.Providers.Hostip was not provided by any .service files How can I fix this ?

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  • How to avoid general names for abstract classes?

    - by djechlin
    In general it's good to avoid words like "handle" or "process" as part of routine names and class names, unless you are dealing with (e.g.) file handles or (e.g.) unix processes. However abstract classes often don't really know what they're going to do with something besides, say, process it. In my current situation I have an "EmailProcessor" that logs into a user's inbox and processes messages from it. It's not really clear to me how to give this a more precise name, although I've noticed the following style matter arises: better to treat derived classes as clients and named the base class by the part of the functionality it implements? Gives it more meaning but will violate is-a. E.g. EmailAcquirer would be a reasonable name since it's acquiring for the derived class, but the derived class won't be acquiring for anyone. Or just really vague name since who knows what the derived classes will do. However "Processor" is still too general since it's doing many relevant operations, like logging in and using IMAP. Any way out of this dilemma? Problem is more evident for abstract methods, in which you can't really answer the question "what does this do?" because the answer is simply "whatever the client wants."

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  • Ubuntu.sh on Android Phone

    - by pjtatlow
    So today I noticed something weird on my phone. I used a terminal emulator to see what I could do with it, and noticed that there is a file called ubuntu.sh. I tried to run it and got all sorts of permission denied errors, and then I decided to root my phone. But now I'm nervous to run it, does anyone know what it does or why it is there? edit I forgot to mention that I have an AT&T Morotola Atrix 4G running Android 2.3.6. Also when I use the app SSHDroid to go into my phone from my Ubuntu machine, I'm greeted with this: "The programs included with the Ubuntu system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. To access official Ubuntu documentation, please visit: http://help.ubuntu.com/" Also, here are the contents of ubuntu.sh #!/bin/sh export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin export LD_LIBRARY_PATH=/usr/lib:/usr/local/lib # make sure no left-over pidfiles, etc. ####################################### rm -fr /var/run/* rm -fr /var/lock/* chmod 666 /system/usr/keychars/* rm -f /tmp/tab* mkdir -p /home/adas/Desktop chmod 755 /home/adas/Desktop chown -R adas.adas /home/adas/Desktop [ -x /usr/bin/firefox-install-profile ] && /usr/bin/firefox-install-profile [ -x /usr/local/bin/check-citrix-certs.sh ] && /usr/local/bin/check-citrix-certs.sh [ -x /usr/bin/migrate-webapps ] && /usr/bin/migrate-webapps # boot scripts ############## /etc/init.d/rc S # lock down /var for CTS ######################## chown root.adas /var/tmp chown root.adas /var/lock chmod 775 /var/tmp chmod 775 /var/lock chmod 666 /dev/socket/dbus chmod 666 /dev/null # runlevel 2 scripts #################### /etc/init.d/rc 2 cp /sdcard/*.lic /data/ chmod 666 /data/*.lic This is really strange, any ideas?

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  • Node.js MMO - process and/or map division

    - by Gipsy King
    I am in the phase of designing a mmo browser based game (certainly not massive, but all connected players are in the same universe), and I am struggling with finding a good solution to the problem of distributing players across processes. I'm using node.js with socket.io. I have read this helpful article, but I would like some advice since I am also concerned with different processes. Solution 1: Tie a process to a map location (like a map-cell), connect players to the process corresponding to their location. When a player performs an action, transmit it to all other players in this process. When a player moves away, he will eventually have to connect to another process (automatically). Pros: Easier to implement Cons: Must divide map into zones Player reconnection when moving into a different zone is probably annoying If one zone/process is always busy (has players in it), it doesn't really load-balance, unless I split the zone which may not be always viable There shouldn't be any visible borders Solution 1b: Same as 1, but connect processes of bordering cells, so that players on the other side of the border are visible and such. Maybe even let them interact. Solution 2: Spawn processes on demand, unrelated to a location. Have one special process to keep track of all connected player handles, their location, and the process they're connected to. Then when a player performs an action, the process finds all other nearby players (from the special player-process-location tracking node), and instructs their matching processes to relay the action. Pros: Easy load balancing: spawn more processes Avoids player reconnecting / borders between zones Cons: Harder to implement and test Additional steps of finding players, and relaying event/action to another process If the player-location-process tracking process fails, all other fail too I would like to hear if I'm missing something, or completely off track.

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  • Facebook PHP SDK and Wordpress Error

    - by Gecko
    I have a developer environment setup with WAMP, Wordpress, and PHPEdit IDE. I use the Facebook, Twitter, and YouTube API's in a sidebar. I'm using Facebook's PHP SDK to display information(no login or admin functions). Since the FB SDK and WP use session_start() I get the following warning: Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at C:\wamp\www\dfi\wp-content\themes\DFI\header.php:12) in C:\wamp\www\dfi\wp-content\themes\DFI\api\facebook.php on line 36 I'm trying to figure this out by using the warning output but it doesn't help considering the following. I know about clearing white space and characters before and after <?php ?> and placing session_start() before any http output. I use unix line enders and UTF8 encoding without BOM. My host server is not set up for output_buffering. header.php line 11 to 13 11 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 12 <html xmlns="http://www.w3.org/1999/xhtml" <?php language_attributes();?>> 13 <head> It looks like the warning comes from inline php code. I don't know what I can do to fix this line. facebook.php line 34 to 37 34 public function __construct($config) { 35 if (!session_id()) { 36 session_start(); 37 } I don't think I can stop either FB or WP from calling session_start() without breaking everything. How do I make Wordpress and Facebook play nicely together without this error?

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  • What is "Open" anyway?

    - by EmbeddedInsider
    This terms is often used with many meanings.  For example, some people consider Flash 'open' and 'multi-platform' .  But Flash is a product of Adobe systems, locked down, copy protected and distribution restricted.  And versions for other than standard PC, home use, may carry licence fees. Check it out: 3.1 Adobe Runtime Restrictions. You will not use any Adobe Runtime on any non-PC device or with any embedded or device version of any operating system. For the avoidance of doubt, and by example only, you may not use an Adobe Runtime on any (a) mobile device, set top box (STB), handheld, phone, web pad, tablet and Tablet PC (other than with Windows XP Tablet PC Edition and its successors), game console, TV, DVD player, media center (other than with Windows XP Media Center Edition and its successors), electronic billboard or other digital signage, Internet appliance or other Internet-connected device, PDA, medical device, ATM, telematic device, gaming machine, home automation system, kiosk, remote control device, or any other consumer electronics device, (b) operator-based mobile, cable, satellite, or television system or (c) other closed system device. For information on licensing Adobe Runtimes for use on such systems please visit http://www.adobe.com/go/licensing. You will notice, for its embedded operating systems, Microsoft buys and includes a fully paid license for Adobe.   Do you get this with Linux?  Unix?  QNX? So, what is 'open'? Lawrence Ricci www.EmbeddedInsider.com

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  • codesniffer command not being recognized after several installs and upgrades

    - by numerical25
    I've tried to install codesniffer using pear but my mac is not recognizing the phpcs command. pear config Configuration (channel pear.php.net): ===================================== Auto-discover new Channels auto_discover 1 Default Channel default_channel pear.php.net HTTP Proxy Server Address http_proxy <not set> PEAR server [DEPRECATED] master_server pear.php.net Default Channel Mirror preferred_mirror pear.php.net Remote Configuration File remote_config <not set> PEAR executables directory bin_dir /usr/local/pear/bin PEAR documentation directory doc_dir /usr/local/pear/docs PHP extension directory ext_dir /opt/local/lib/php/extensions/no-debug-non-zts-20090626 PEAR directory php_dir /usr/local/pear/share/pear PEAR Installer cache directory cache_dir /private/tmp/pear/cache PEAR configuration file cfg_dir /usr/local/pear/cfg directory PEAR data directory data_dir /usr/local/pear/data PEAR Installer download download_dir /tmp/pear/install directory PHP CLI/CGI binary php_bin /opt/local/bin/php php.ini location php_ini /opt/local/etc/php5/php.ini-development --program-prefix passed to php_prefix <not set> PHP's ./configure --program-suffix passed to php_suffix <not set> PHP's ./configure PEAR Installer temp directory temp_dir /tmp/pear/install PEAR test directory test_dir /usr/local/pear/tests PEAR www files directory www_dir /usr/local/pear/www Cache TimeToLive cache_ttl 3600 Preferred Package State preferred_state stable Unix file mask umask 22 Debug Log Level verbose 1 PEAR password (for password <not set> maintainers) Signature Handling Program sig_bin /usr/local/bin/gpg Signature Key Directory sig_keydir /opt/local/etc/pearkeys Signature Key Id sig_keyid <not set> Package Signature Type sig_type gpg PEAR username (for username <not set> maintainers) User Configuration File Filename /Users/anthonygordon/.pearrc System Configuration File Filename /opt/local/etc/pear.conf i checked php_bin and the php executable is there. when i run phpcs i get command not found Ive tried to upgrade pear, uninstall reinstall code sniffer, everything. when i run installs list i get Pear List Package Version State Archive_Tar 1.3.10 stable Console_Getopt 1.3.1 stable PEAR 1.9.4 stable PHP_CodeSniffer 1.4.0 stable Structures_Graph 1.0.4 stable XML_Util 1.2.1 stable

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  • mysql service do not launch

    - by ted
    Sorry for my English; I was trying to create db with rake in RoR application that has been configured for MySQL(gem installed, settings changed). After that attempt mysql-server broke: d@calister:~$ mysql ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) mysqld is not running at all: d@calister:~$ ps aux | grep mysql d 3769 0.0 0.0 4368 832 pts/0 S+ 18:03 0:00 grep --color=auto mysql And also it doesn't seem it would like to run: d@calister:~$ sudo service mysql start start: Job failed to start Any suggestions? Thanks EDIT: d@calister:~$ sudo -u mysql mysqld 120520 18:45:11 [Note] Plugin 'FEDERATED' is disabled. mysqld: Table 'mysql.plugin' doesn't exist 120520 18:45:11 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it. 120520 18:45:11 InnoDB: The InnoDB memory heap is disabled 120520 18:45:11 InnoDB: Mutexes and rw_locks use GCC atomic builtins 120520 18:45:11 InnoDB: Compressed tables use zlib 1.2.3.4 120520 18:45:11 InnoDB: Initializing buffer pool, size = 128.0M 120520 18:45:11 InnoDB: Completed initialization of buffer pool 120520 18:45:11 InnoDB: highest supported file format is Barracuda. 120520 18:45:12 InnoDB: Waiting for the background threads to start 120520 18:45:13 InnoDB: 1.1.8 started; log sequence number 1589459 120520 18:45:13 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist

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  • ghc6 install trouble: hGetContents: invalid argument (invalid UTF-8 byte sequence)

    - by olimay
    Having trouble installing ghc6. Here's what seems to be the relevant error that comes up when I try to (apt-get|aptitude) install ghc6: A package failed to install. Trying to recover: Setting up ghc6 (6.12.1-13ubuntu1) ... ghc-pkg: /home/opm/.ghc/i386-linux-6.12.1/package.conf.d/unix-compat-0.2-edefa7bced91ebe610d455bab466e200.conf: hGetContents: invalid argument (invalid UTF-8 byte sequence) (Here's the full output, if you're interested: http://paste.ubuntu.com/566475/ ) This still happens after apt-get clean and apt-get update. My searching around has not really helped me understand what's going on, except that it might be caused by a mismatch in locale. So, here's the output of locale too: LANG=en_US.utf8 LANGUAGE=en_US:en LC_CTYPE="en_US.utf8" LC_NUMERIC="en_US.utf8" LC_TIME="en_US.utf8" LC_COLLATE="en_US.utf8" LC_MONETARY="en_US.utf8" LC_MESSAGES="en_US.utf8" LC_PAPER="en_US.utf8" LC_NAME="en_US.utf8" LC_ADDRESS="en_US.utf8" LC_TELEPHONE="en_US.utf8" LC_MEASUREMENT="en_US.utf8" LC_IDENTIFICATION="en_US.utf8" LC_ALL= Any ideas? Additional background: this all seems very strange to me, because I used to have ghc6 installed correctly--I use XMonad as my main window manager most of the time. I tried to install haskell-platform (through apt), which failed and told me that there was something wrong with ghc6, and so I reinstalled ghc6 and began to get the above error message. (Originally posted here to SuperUser, until I remembered today that this SE site existed.)

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  • Continuous Integration using Docker

    - by Leon Mergen
    One of the main advantages of Docker is the isolated environment it brings, and I want to leverage that advantage in my continuous integration workflow. A "normal" CI workflow goes something like this: Poll repository for changes Pull from repository Install dependencies Run tests In a Dockerized workflow, it would be something like this: Poll repository for changes Pull from repository Build docker image Run docker image as container Run tests Kill docker container My problem is with the "run tests" step: since Docker is an isolated environment, intuitively I would like to treat it as one; this means the preferred method of communication are sockets. However, this only works well in certain situations (a webapp, for example). When testing different kind of services (for example, a background service that only communicated with a database), a different approach would be required. What is the best way to approach this problem? Is it a problem with my application's design, and should I design it in a more TDD, service-oriented way that always listens on some socket? Or should I just give up on isolation, and do something like this: Poll repository for changes Pull from repository Build docker image Run docker image as container Open SSH session into container Run tests Kill docker container SSH'ing into the container seems like an ugly solution to me, since it requires deep knowledge of the contents of the container, and thus break the isolation. I would love to hear SO's different approaches to this problem.

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  • Microphone - static background noise suppression

    - by user1873947
    My soundcard is Realtek ALC 892. On Windows 7 I use official Realtek drivers, on Linux I use PulseAudio (on Ubuntu 13.10). On both Windows and Linux, when I enable microphone boost +30db (required because my microphone is quiet), I get very annoying and loud background noise (I also confirmed the background noise with Audacity on both systems). However, Windows Realtek drivers have noise suppression option which works (after enabling it, Audacity shows no background noise and my ears also confirm that there is no background noise). My question is how can I enable background noise suppression in ALSA/PulseAudio? Is there any module I can install or maybe there is a setting for it that can be enabled in config file? I can't find solution for it and this is the only thing that prevents me from switching to Linux completely - as I talk using microphone a lot and on Windows the Realtek software removes the background noise completely and PulseAudio doesn't remove it, which means the recorded voice on Linux is very bad. I know I could buy better soundcard and microphone, but as I said, Windows Realtek drivers remove the noise on software level in real time (ie no noise when talking on TeamSpeak3/Steam/whatever voip programme) so I hope that there is such option on Linux as well. Thanks in advance! This is also crossposted on Unix StackExchange

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  • Code Generation and IDE vs writing per Hand

    - by sytycs
    I have been programming for about a year now. Pretty soon I realized that I need a great Tool for writing code and learned Vim. I was happy with C and Ruby and never liked the idea of an IDE. Which was encouraged by a lot of reading about programming.[1] However I started with (my first) Java Project. In a CS Course we were using Visual Paradigm and encouraged to let the program generate our code from a class diagram. I did not like that Idea because: Our class diagram was buggy. Students more experienced in Java said they would write the code per hand. I had never written any Java before and would not understand a lot of the generated code. So I took a different approach and wrote all methods per Hand (getter and Setter included). My Team-members have written their parts (partly generated by VP) in an IDE and I was "forced" to use it too. I realized they had generated equal amounts of code in a shorter amount of time and did not spend a lot of time setting their CLASSPATH and writing scripts for compiling that son of a b***. Additionally we had to implement a GUI and I dont see how we could have done that in a sane matter in Vim. So here is my Problem: I fell in love with Vim and the Unix way. But it looks like for getting this job done (on time) the IDE/Code generation approach is superior. Do you have equal experiences? Is Java by the nature of the language just more suitable for an IDE/Code generated approach? Or am I lacking the knowledge to produce equal amounts of code "per Hand"? [1] http://heather.cs.ucdavis.edu/~matloff/eclipse.html

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  • Lexmark X5650 doesn't print (scanning works)

    - by unor
    I want to use a Lexmark X5650 under Ubuntu. When I connect it via USB, Ubuntu recognizes the device, but can't find a driver. On the Lexmark support site, you can select "Unix/Linux" and then "Ubuntu 9.04", "9.10", "10.04" and "10.10". However, all versions lead to the same driver: lexmark-08z-series-driver-1.0-1.i386.deb.sh.tar.gz (Last updated: 2012-04-13). While installing this driver, the installer asks me to connect the device. As soon as I connect it via USB, Ubuntu now adds the printer automatically. So after the installation completed, I had 2 printers set up. But I can't print anything (I tried it with both printer configurations). Scanning works fine, though. So I guess the driver installation and the device connection are successful. When I try to print something, the print job is listed in the printing queue, but nothing happens. After some time, I get an error message which starts a debug wizard, but in the end it reads something like "Sorry, couldn't find the reason". I had several different error messages (unfortunately, I didn't record them), one was approximately like "printer cannot communicate with computer". Another said that my color ink was low (which is true, but black is full). Another said there was an input/output error. I tried it with Ubuntu 11.10. Because I read that some people had success with 10.04., I installed it in QEMU and installed the driver there, too. Same problem, though. I'd like to upgrade to 12.04, if it should work there for any reason, but I read that for some people this printer stopped working in 12.04 :/ So, it would be best if the printer would work in 12.04. If that's not possible, I'd be fine with starting a QEMU virtual machine with any GNU/Linux distribution that works with my printer.

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  • Thoughts on iPhone, Flash, IE

    - by guybarrette
    It’s interesting to see the debate caused by the iPhone debate over Flash.  In the new version of the iPhone Developer Program License Agreement, Apple bans Flash and Monotouch: 3.3.1 — Applications may only use Documented APIs in the manner prescribed by Apple and must not use or call any private APIs. Applications must be originally written in Objective-C, C, C++, or JavaScript as executed by the iPhone OS WebKit engine, and only code written in C, C++, and Objective-C may compile and directly link against the Documented APIs (e.g., Applications that link to Documented APIs through an intermediary translation or compatibility layer or tool are prohibited). In Adobe’s last SEC filing, they list the iPhone/iPad as a threat to their business. http://www.sec.gov/Archives/edgar/data/796343/000079634310000007/form_10q.htm#riskfactors We offer our desktop application-based products primarily on Windows and Macintosh platforms. We generally offer our server-based products on the Linux platform as well as the Windows and UNIX platforms. To the extent that there is a slowdown of customer purchases of personal computers on either the Windows or Macintosh platform or in general, to the extent that we have difficulty transitioning product or version releases to new Windows and Macintosh operating systems, or to the extent that significant demand arises for our products or competitive products on other platforms before we choose and are able to offer our products on these platforms our business could be harmed. Additionally, to the extent new releases of operating systems or other third-party products, platforms or devices, such as the Apple iPhone or iPad, make it more difficult for our products to perform, and our customers are persuaded to use alternative technologies, our business could be harmed. I had a conversation recently about IE9 and people were asking why is Microsoft spending money and resources to build IE9 now that we have Silverlight.  It makes just no sense to put so much efforts to support HTML 5 in IE because it’s overlapping with Silverlight, no?  Well, what if Chrome became the dominant browser and all of a sudden, Google would remove the object tag?  Would Microsoft be in the same position as Adobe is right now on the iPhone? What do you think? var addthis_pub="guybarrette";

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  • Tips for debugging Samba performance?

    - by j-g-faustus
    Samba gives me 24 MB/s read and 44 MB/s write, while ftp gives 97 and 112 MB/s under the same circumstances. The documentation says that Generally, you should find that Samba performs similarly to ftp at raw transfer speed. In my case it clearly doesn't. Where can I find tips on how to debug Samba performance? Or alternatively tips for replacing Samba with something else? (I can't use ftp, unfortunately, as I need something that can be used with rsync/rsnapshot.) More details: Both computers are running Ubuntu 10.10 (using Samba because I have a Mac as well) The Samba share is on a local home network, mounted as $ mount ... //server.local/share/ on /mnt/share type cifs (rw,mand) Samba performance was tested by copying (cp) a single file of ~4GB to and from the share, using time for timing and calculating transfer speed by hand. ftp performance are the numbers from the ftp client for get/put of the same file. iperf gives network speed ~900 Mbits/s bonnie++ gives disk speeds 200 MB/s on both sides for block reads as well as block writes Tried changing the parameters suggested in the performance tuning HOWTO (read/write raw, read size, socket options), most of them made little to no difference. (The one that made a difference caused write speed to drop 50%.)

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  • Happy Birthday, SPARC!

    - by A&C Redaktion
    25 Jahre gibt es SPARC in diesem Herbst – da gratulieren Oracle A&C und alle Partner natürlich ganz herzlich! Wir blicken zurück auf ein Vierteljahrhundert Erfolgsgeschichte:Wir befinden uns im Jahr 1987 und klobige graue PCs halten seit einigen Jahren Einzug in Büros und Privathäuser. Ein innovatives Startup-Unternehmen namens Sun Microsystems präsentiert seinen neuen Computer Sun-4, die eigentliche Sensation jedoch ist der Mikroprozessor, den die jungen Leute extra dafür entwickelt hatten: SPARC. Es handelte sich um einen extrem leistungsfähigen RISC-Hauptprozessor, der sowohl in den eigenen Workstations als auch den Servern der Sun-4-Baureihe zum Einsatz kommt. Vor allem in der Unternehmens-IT ermöglicht SPARC in den Folgejahren einen enormen Sprung nach vorn.Die weitere Entwicklung von SPARC, kombiniert mit einem Überblick über andere Meilensteine in der Geschichte der Computerwelt, finden Sie auf der Webseite "Celebrate 25 Years of SPARC Innovation".Wir springen gleich weiter in die Gegenwart, denn auch seit Sun zu Oracle gehört, hat sich so manches getan: Gerade erst hat Oracle die neue Server-Linie Sparc T4 vorgestellt – in Fachkreisen spricht man bereits von der größten Leistungssteigerung in der Geschichte der SPARC-Prozessoren.In den USA wurde das Jubiläum bereits kräftig gefeiert: Hier finden Sie Bilder vom Geburtstagsfest im Museum für Computer-Geschichte in Mountain View, Kalifornien, bei dem auch die SPARC-Entwickler Bill Joy and Andreas von Bechtolsheim zugegen waren und auch im Video SPARC-Event Highlights dreht sich alles um das Jubiläum. In der Oracle Familie gibt es 2012 noch ein weiteres Geburtstagskind: Solaris wird 20, herzlichen Glückwunsch! Das Unix-Betriebssystem, basierend auf SunOS, kam im Jahr 1992 erstmals auf den Markt. Solaris konnte seine gute Stellung seither behaupten und hat nun mit Solaris 11.1 das erste Cloud-Betriebssystem vorgestellt. Dieses überträgt die Zuverlässigkeit, Sicherheit und Skalierbarkeit des bewährten Solaris in die Cloud und bietet eine optimale Plattform für Unternehmensanwendungen.  Lesen Sie hier, was die Fachpresse über die Geburtstagskinder schreibt: ProLinux.de (SPARC) Computerwoche.de (Solaris)SearchDataCenter.de (Solaris)

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  • Happy Birthday, SPARC!

    - by A&C Redaktion
    25 Jahre gibt es SPARC in diesem Herbst – da gratulieren Oracle A&C und alle Partner natürlich ganz herzlich! Wir blicken zurück auf ein Vierteljahrhundert Erfolgsgeschichte:Wir befinden uns im Jahr 1987 und klobige graue PCs halten seit einigen Jahren Einzug in Büros und Privathäuser. Ein innovatives Startup-Unternehmen namens Sun Microsystems präsentiert seinen neuen Computer Sun-4, die eigentliche Sensation jedoch ist der Mikroprozessor, den die jungen Leute extra dafür entwickelt hatten: SPARC. Es handelte sich um einen extrem leistungsfähigen RISC-Hauptprozessor, der sowohl in den eigenen Workstations als auch den Servern der Sun-4-Baureihe zum Einsatz kommt. Vor allem in der Unternehmens-IT ermöglicht SPARC in den Folgejahren einen enormen Sprung nach vorn.Die weitere Entwicklung von SPARC, kombiniert mit einem Überblick über andere Meilensteine in der Geschichte der Computerwelt, finden Sie auf der Webseite "Celebrate 25 Years of SPARC Innovation".Wir springen gleich weiter in die Gegenwart, denn auch seit Sun zu Oracle gehört, hat sich so manches getan: Gerade erst hat Oracle die neue Server-Linie Sparc T4 vorgestellt – in Fachkreisen spricht man bereits von der größten Leistungssteigerung in der Geschichte der SPARC-Prozessoren.In den USA wurde das Jubiläum bereits kräftig gefeiert: Hier finden Sie Bilder vom Geburtstagsfest im Museum für Computer-Geschichte in Mountain View, Kalifornien, bei dem auch die SPARC-Entwickler Bill Joy and Andreas von Bechtolsheim zugegen waren und auch im Video SPARC-Event Highlights dreht sich alles um das Jubiläum. In der Oracle Familie gibt es 2012 noch ein weiteres Geburtstagskind: Solaris wird 20, herzlichen Glückwunsch! Das Unix-Betriebssystem, basierend auf SunOS, kam im Jahr 1992 erstmals auf den Markt. Solaris konnte seine gute Stellung seither behaupten und hat nun mit Solaris 11.1 das erste Cloud-Betriebssystem vorgestellt. Dieses überträgt die Zuverlässigkeit, Sicherheit und Skalierbarkeit des bewährten Solaris in die Cloud und bietet eine optimale Plattform für Unternehmensanwendungen.  Lesen Sie hier, was die Fachpresse über die Geburtstagskinder schreibt: ProLinux.de (SPARC) Computerwoche.de (Solaris)SearchDataCenter.de (Solaris)

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  • Apache Server-Side Includes Refuse to Work (Tried everything in the docs but still no joy)

    - by raindog308
    Trying to get apache server-side includes to work. Really simple - just want to include a footer on each page. Apache 2.2: # ./httpd -v Server version: Apache/2.2.21 (Unix) Server built: Dec 4 2011 18:24:53 Cpanel::Easy::Apache v3.7.2 rev9999 mod_include is compiled in: # /usr/local/apache/bin/httpd -l | grep mod_include mod_include.c And it's in httpd.conf: # grep shtml httpd.conf AddType text/html .shtml DirectoryIndex index.html.var index.htm index.html index.shtml index.xhtml index.wml index.perl index.pl index.plx index.ppl index.cgi index.jsp index.js index.jp index.php4 index.php3 index.php index.phtml default.htm default.html home.htm index.php5 Default.html Default.htm home.html AddHandler server-parsed .shtml AddType text/html .shtml In the web directory I created a .htaccess with Options +Includes And then in the document, I have: <h1>next should be the include</h1> <!--#include virtual="/footer.html" --> <h1>include done</h1> And I see nothing in between those headers. Tried file=, also with/without absolute path. Is there something else I'm missing? I see the same thing on another unrelated server (more or less stock CentOS 6), so I suspect the problem is between keyboard and chair...

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  • Is It Time To Specialize?

    - by Tim Murphy
    Originally posted on: http://geekswithblogs.net/tmurphy/archive/2013/06/18/is-it-time-to-specialize.aspx Over my career I have made a living as a generalist.  I have been a jack of all trades and a master of none.  It has served me well in that I am able to move from one technology to the other quickly and make myself productive.  Where it becomes a problem is deep knowledge.  I am constantly digging for the things that aren’t basic knowledge.  How do you make a product like WCF or Windows RT do more than just “Hello World”? As an architect I need to be a jack of all trades.  This is what helps me to bring the big picture of a project into focus for developers with different skills to accomplish the goals of the project. It is a key when the mix technologies crosses Windows, Unix and Mainframe with different languages and databases.  The larger the company that the project is for the more likely this scenario will arise. As a consultant and a developer I need to have specialized skills in order to get the job done efficiently.  if I have a SharePoint or Windows Phone project knowing the object model details and possible roadblocks of the technology allow me to stay within budgets as well as better advise the client on technology decisions. What is the solution?  Constant learning and associating with developers who specialize in a variety of technologies is the best thing you can do.  You may have thought you were done with classes when you left college, but in this industry you need to constantly be learning new products and languages.  The ultimate answer is you must generally specialize.  Learn as many subject areas as possible, but go deep when ever you can.  Sleep is overrated.  Good luck. del.icio.us Tags: software development,software architecture,specialization,generalist

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  • CodePlex Daily Summary for Tuesday, May 27, 2014

    CodePlex Daily Summary for Tuesday, May 27, 2014Popular ReleasesAD4 Application Designer for flow based .NET applications: AD4.AppDesigner.18.11: AD4.Iteration.18.11(Rendering of flow chart) Bugfix: AppWrapperClassContainer MakeWrapperBuildInstances MakeFlowClassCtor Note: Currently not all elements are shown in flow chart area! This version is able to generate the source code of some samples. See: Sample Applications (You find the flow description in the documents folder of each sample). The gluing code of the AD4.AppDesigner was created by the previous version of the AD4.AppDesigner. You find the current app definition in t...ClosedXML - The easy way to OpenXML: ClosedXML 0.71.1: More performance improvements. It's faster and consumes less memory.SQL Server Change Data Capture Application: Release 1: This is the initial release of SQLCDCApp. Download the zip file. Unzip and run SQLCDCApp.exe to start.Role Based Views in Microsoft Dynamics CRM 2011: Role Based Views in CRM 2011 and 2013 - 1.1.0.0: Issues fixed in this build: 1. Works for CRM 2013 2. Lookup view not getting blockedMathos Parser: 1.0.6.1 + source code: Removed the bug with comma/dot reported and fixed by Diego.Dynamics AX Build Scripts: DynamicsAXCommunity Powershell module (0.3.0): Change log(previous release was 0.2.4) 0.3.0 AxBuild (http://msdn.microsoft.com/en-us/library/dn528954.aspx) is supported and used by default. Smarter dealing with versions - e.g. listing configurations for all versions in the same time. $AxVersionPreference shouldn't be normally needed. Additional properties returned by Get-AXConfig. 0.2.5 -StartupCmd and -Wait added to Start-AXClient. Handles console output sent from AX (http://dev.goshoom.net/en/2012/05/console-output-ax/).xFunc: xFunc 2.15.6: Fidex #77QuickMon: Version 3.12: This release is mostly just to improve the UI for the Windows client. There are a few minor fixes as well. 1. Polling frequency presets fixed (slow, normal and fast) 2. Added collector call duration to history 3. History now displays time, state, duration and details in separate columns 4. Added a quick launch drop down list to main Window (only visible when mouse hover over it) 5. Removed the toolbar border. 6. Changed Windows service collector to report error only when all services from al...VK.NET - Vkontakte API for .NET: VkNet 1.0.5: ?????????? ????? ??????.Kartris E-commerce: Kartris v2.6002: Minor release: Double check that Logins_GetList sproc is present, sometimes seems to get missed earlier if upgrading which can give error when viewing logins page Added CSV and TXT export option; this is not Google Products compatible, but can give a good base for creating a file for some other systems such as Amazon Fixed some minor combination and options issues to improve interface back and front Turn bitcoin and some other gateways off by default Minor CSS changes Fixed currenc...SimCityPak: SimCityPak 0.3.1.0: Main New Features: Fixed Importing of Instance Names (get rid of the Dutch translations) Added advanced editor for Decal Dictionaries Added possibility to import .PNG to generate new decals Added advanced editor for Path display entriesTiny Deduplicator: Tiny Deduplicator 1.0.1.0: Increased version number to 1.0.1.0 Moved all options to a separate 'Options' dialog window. Allows the user to specify a selection strategy which will help when dealing with large numbers of duplicate files. Available options are "None," "Keep First," and "Keep Last"C64 Studio: 3.5: Add: BASIC renumber function Add: !PET pseudo op Add: elseif for !if, } else { pseudo op Add: !TRACE pseudo op Add: Watches are saved/restored with a solution Add: Ctrl-A works now in export assembly controls Add: Preliminary graphic import dialog (not fully functional yet) Add: range and block selection in sprite/charset editor (Shift-Click = range, Alt-Click = block) Fix: Expression evaluator could miscalculate when both division and multiplication were in an expression without parenthesisSEToolbox: SEToolbox 01.031.009 Release 1: Added mirroring of ConveyorTubeCurved. Updated Ship cube rotation to rotate ship back to original location (cubes are reoriented but ship appears no different to outsider), and to rotate Grouped items. Repair now fixes the loss of Grouped controls due to changes in Space Engineers 01.030. Added export asteroids. Rejoin ships will merge grouping and conveyor systems (even though broken ships currently only maintain the Grouping on one part of the ship). Installation of this version wi...Player Framework by Microsoft: Player Framework for Windows and WP v2.0: Support for new Universal and Windows Phone 8.1 projects for both Xaml and JavaScript projects. See a detailed list of improvements, breaking changes and a general overview of version 2 ADDITIONAL DOWNLOADSSmooth Streaming Client SDK for Windows 8 Applications Smooth Streaming Client SDK for Windows 8.1 Applications Smooth Streaming Client SDK for Windows Phone 8.1 Applications Microsoft PlayReady Client SDK for Windows 8 Applications Microsoft PlayReady Client SDK for Windows 8.1 Applicat...TerraMap (Terraria World Map Viewer): TerraMap 1.0.6: Added support for the new Terraria v1.2.4 update. New items, walls, and tiles Added the ability to select multiple highlighted block types. Added a dynamic, interactive highlight opacity slider, making it easier to find highlighted tiles with dark colors (and fixed blurriness from 1.0.5 alpha). Added ability to find Enchanted Swords (in the stone) and Water Bolt books Fixed Issue 35206: Hightlight/Find doesn't work for Demon Altars Fixed finding Demon Hearts/Shadow Orbs Fixed inst...DotNet.Highcharts: DotNet.Highcharts 4.0 with Examples: DotNet.Highcharts 4.0 Tested and adapted to the latest version of Highcharts 4.0.1 Added new chart type: Heatmap Added new type PointPlacement which represents enumeration or number for the padding of the X axis. Changed target framework from .NET Framework 4 to .NET Framework 4.5. Closed issues: 974: Add 'overflow' property to PlotOptionsColumnDataLabels class 997: Split container from JS 1006: Series/Categories with numeric names don't render DotNet.Highcharts.Samples Updated s...PowerShell App Deployment Toolkit: PowerShell App Deployment Toolkit v3.1.3: Added CompressLogs option to the config file. Each Install / Uninstall creates a timestamped zip file with all MSI and PSAppDeployToolkit logs contained within Added variable expansion to all paths in the configuration file Added documentation for each of the Toolkit internal variables that can be used Changed Install-MSUpdates to continue if any errors are encountered when installing updates Implement /Force parameter on Update-GroupPolicy (ensure that any logoff message is ignored) ...WordMat: WordMat v. 1.07: A quick fix because scientific notation was broken in v. 1.06 read more at http://wordmat.blogspot.com????: 《????》: 《????》(c???)??“????”???????,???????????????C?????????。???????,???????????????????????. ??????????????????????????????????;????????????????????????????。New Projects2112110016: BÀI T?P OOP2112110072: 2112110072 Bai tap OOPA more efficient algorithm for an NP-complete problem: Algorithm for finding Hamiltonian cycle.Asprise OCR for C#/VB.NET Sample Applications: Embeded with a high performance OCR (optical character recognition) engine, Asprise OCR SDK library for Java, VB.NET, CSharp.NET, VC++, VB6.0, C, C++, Delphi onDisenio1Obli1: Obligatorio desarrollado por Santiago Perez y Germán Otero Universidad ORT, Año 2014DuAnCuoiKy: lap trinh windows form cuoi ky, quan ly sinh vien truong hoc student management systemEnterprise Integration and BPM - A WF Integration and BPM blueprint: A CQRS based EAI (Enterprise Application Integration) and BMP (Business Process Management) blueprint using Message Queues and Windows Workflow Foundation.GU.ERP: saLaunchPad2: A remote device timing and control systemNMusicCreator: A simple program for creating music.PPM: ??SharePoint 2013 Latency Health Analyzer Rule: Analyze network latency for all SQL Servers using this custom health analyzer rule.SnapPea: A simple MVC content management system.The Bubble Index: The Bubble Index, a Java (TM) application to measure the level of financial bubbles. Published with GNU General Public License version 2 (GPLv2).Tools for Manufacturing: t4mfg is a set of programs to be used by small to medium sized companies that manufacture goods to order.Unix Project Template: A simple framework for creating unix projects using C++ and make.

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  • Perl - can't flush STDOUT or STDERR

    - by Jim Salter
    Perl 5.14 from stock Ubuntu Precise repos. Trying to write a simple wrapper to monitor progress on copying from one stream to another: use IO::Handle; while ($bufsize = read (SOURCE, $buffer, 1048576)) { STDERR->printflush ("Transferred $xferred of $sendsize bytes\n"); $xferred += $bufsize; print TARGET $buffer; } This does not perform as expected (writing a line each time the 1M buffer is read). I end up seeing the first line (with a blank value of $xferred), and then the 7th and 8th lines (on an 8MB transfer). Been pounding my brains out on this for hours - I've read the perldocs, I've read the classic "Suffering from Buffering" article, I've tried everything from select and $|++ to IO::Handle to binmode (STDERR, "::unix") to you name it. I've also tried flushing TARGET with each line using IO::Handle (TARGET-flush). No dice. Has anybody else ever encountered this? I don't have any ideas left. Sleeping one second "fixes" the problem, but obviously I don't want to sleep a second every time I read a buffer just so my progress will output on the screen! FWIW, the problem is exactly the same whether I'm outputting to STDERR or STDOUT.

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  • Remote Data connection in iphone app

    - by Tariq- iPHONE Programmer
    Hello, i am working with Social Networking iphone app which require remote data connection. So i hired a php developer in order to provide me RESTful services. But when i start working with him, he arguing me that he will not make stored procedures and web services. Instead of he suggested me to pass query as a parameter. Suppose If I have to call Search service, he told me to send POST request with 3 parameters: Query="select * from users", username=abd and password = 123 And i thing there is no such architecture in order to use remote data. Then he is saying it is possible through socket programming. And I am 100% sure this is not an appropriate way to access remote data. This is simply illogical. Thousands of iphone application using REST/SOAP services to make remote data connection He just declined me to provide RESTful services. Please its my heartily advice to all developers that post your own views over here. So that I can show to that developers that these are the views from all developers worldwide.

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  • Moving from windows to linux

    - by rincewind
    I need to reconcile these 2 facts: I don't feel comfortable working on Linux; I need to develop software for Linux. Some background: I have a 10+ years of programming experience on Windows (almost exclusively C/C++, but some .NET as well), I was a user of FreeBSD at home for about 3 years or so (then had to go back to Windows), and I've never had much luck with Linux. And now I have to develop software for Linux. I need a plan. On Windows, you can get away with just knowing a programming language, an API you're coding against, your IDE (VisualStudio) and some very basic tools for troubleshooting (Depends, ProcessExplorer, DebugView, WinDbg). Everything else comes naturally. On Linux, it's a very different story. How the hell would I know what DLL (sorry, Shared Object) would load, if I link to it from Firefox plugin? What's the Linux equivalent of inserting __asm int 3/DebugBreak() in the source and running the program, and then letting the OS call a debugger? Why the hell release builds use something, called appLoader, while debug builds work somehow different? Worst of all: how to provision Linux development environment? So, taking into account that hatred is usually associated with not knowing enough, what would you recommend? I'm ok with Emacs and GCC. I need to educate myself as a Linux admin/user, and I need to learn proper troubleshooting tools (strace is cool, btw), equivalents to the ones I mentioned above. Do I need to do Linux From Scratch? Or do I need to just read some books (I've read "UNIX programming enviornment" by Kernighan and "Advanced Programming..." by Stevens, but I need to learn something more practical)? Or do I need to have some Linux distro on my home computer?

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  • How to make game sessions like "with friends" games?

    - by Miguel lugo
    I want to make a game like "words with friends" or "chess with friends" or "Draw Something" or any of the other online multiplayer type games that are based around friends having game sessions with each other. I have made one app before that had no online features so I know the basics of objective-C and xCode. I looked up facebook connect so I know how to make friends find other friends to play with through Facebook. Just not how to make the gaming session. I only need my game to send a small array (or XML if it's better) of strings and integers from one iPhone to the other as each iPhone takes a turn. I'm NOT sending some complex video or anything like in "Draw Something." I was hoping someone could point me in the right direction (whether link to website or book or just a general idea) for how to do gaming sessions between two iPhones. I read this tutorial http://www.raywenderlich.com/3932/how-to-create-a-socket-based-iphone-app-and-server but it seems to be more about having two iPhones communicate over a server on a laptop or through the same wifi, not how to have iPhones game together over any Internet connection like in "with friends" games. I've tried to research this in other places but I'm never quite sure if what the articles I find are talking about is related to what I want or not. Someone please just point me in the right direction or give me a general outline of what to do. I will look up the specifics on my own once I know what to look for. Thank you.

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