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• cannot find vcvarsall.bat when runnning a pyhton script

  - by Ariel

  hello all, i am working on vista, and using python 2.6.4. i am using a software which uses a python script. but then i bumped into the message "cannot find vcvarsall.bat". so i installed visual c++ 2010. still the file is not found though it is there. my guess (a very uneducated one...) is that somewhere the path is wrong, because i also have an old visual 2008 (pretty empty) folder. since i have little idea in programming i have no idea where to make the changes for the new path. do i change something in the registery or in the script. i would be happy if somebody could help (preferably in lamen terms). thanx. Ariel

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• Language Design: Combining Gotos and Functions

  - by sub

  I'm designing and currently rethinking a low-level interpreted programming language with similarities to assembler. I very soon came across the functions/loops/gotos decision problem and thought that while loops like while and for would be too high-level and unfitting, gotos would be too low level, unmaintainable and generally evil again. Functions like you know them from most languages that have return values and arguments aren't fitting in the language's concept either. So I tried to figure out something between a function and a goto which is capable of Recursion Efficient loops After some thinking I came up with the idea of subroutines: They have a beginning and an end like a function They have a name but no arguments like a goto You can go into one with jump and go out of it again before its end with return (doesn't give back any result, only stops the subroutine) Handled just like normal code - Global scope like goto So I wanted to know: Is the idea above good? What are the (dis)advantages? Would there be a better combination of function and goto or even a completely new idea?

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• MVC with cocoa/objective-c

  - by Leonardo

  Hi all, I have a strong j2ee background, and I am trying to move to objective-c for some desktop/iphone programming. I used many java web frameworks with mvc in mind, spring and struts ecc... so I am used to have servlet or controller which pass attributes to jsp pages, which is the view. In jsp pages with jstl you can call this attribute and render to video. In this way controller and view are (in theory) clearly separated. With xcode, I can easily recognize the controller and the view built with IBuilder. All the tutorial I found, shown the controller which go and change directly labels or text fields. So my two questions: seems to me that there's no separation between the two (controller and view), where I am wrong in that ? is there a way for a controller to pack all objects in a kind of context in a j2ee way and have the view read that context ? thanks Leonardo

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• Seeking enlightenment - global variables in AppEngine (aeoid.get_current_user())

  - by jerd

  Hello This may be a 'Python Web Programming 101' question, but I'm confused about some code in the aeoid project (http://github.com/Arachnid/aeoid). here's the code: _current_user = None def get_current_user(): """Returns the currently logged in user, or None if no user is logged in.""" global _current_user if not _current_user and 'aeoid.user' in os.environ: _current_user = User(None, _from_model_key=os.environ['aeoid.user']) return _current_user But my understanding was that global variables were, ehm, global! And so different requests from different users could (potentially) access and update the same value, hence the need for sessions, in order to store per-user, non-global variables. So, in the code above, what prevents one request from believing the current user is the user set by another request? Sorry if this is basic, it's just not how i thought things worked. Thanks

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• What web-development platform should I use considering Time-To-Market?

  - by Jonas

  I have been looking at a few differend platforms for my coming web-development project. I would like to hear what web-development platform is recommended when considering Time-To-Maket. Suppose that I already know the programming language well, but not the web-framework. The OS will be Linux. My requirements and priorities: Time-To-Market RESTful Maintainable code Scales-up (not dog-slow) The one I have looked at but never used are: Java and Play! Framework or GWT Python and Django PHP and Zend Framework Ruby and Ruby on Rails Erlang and Nitrogen and Webmachine Scala and Lift C++ and Wt C# and ASP.NET Mono It's a bonus if the framework has support for making sites for mobile phones.

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• MySQL daemon keeps terminating unexpectedly

  - by Yehia A.Salam

  The MySQL daemon on my CentOS server keeps crashing, i got the logs from /var/logs/mysqld but still i am not sure how to fix this: 121114 16:22:56 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended 121114 21:55:11 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql 121114 21:55:11 [Note] Plugin 'FEDERATED' is disabled. 121114 21:55:11 InnoDB: The InnoDB memory heap is disabled 121114 21:55:11 InnoDB: Mutexes and rw_locks use GCC atomic builtins 121114 21:55:11 InnoDB: Compressed tables use zlib 1.2.3 121114 21:55:11 InnoDB: Using Linux native AIO 121114 21:55:11 InnoDB: Initializing buffer pool, size = 128.0M 121114 21:55:11 InnoDB: Completed initialization of buffer pool 121114 21:55:11 InnoDB: highest supported file format is Barracuda. InnoDB: The log sequence number in ibdata files does not match InnoDB: the log sequence number in the ib_logfiles! 121114 21:55:11 InnoDB: Database was not shut down normally! InnoDB: Starting crash recovery. InnoDB: Reading tablespace information from the .ibd files... InnoDB: Restoring possible half-written data pages from the doublewrite InnoDB: buffer... 121114 21:55:12 InnoDB: Waiting for the background threads to start 121114 21:55:13 InnoDB: 1.1.6 started; log sequence number 77177262 121114 21:55:13 [Note] Event Scheduler: Loaded 0 events 121114 21:55:13 [Note] /usr/libexec/mysqld: ready for connections. Version: '5.5.12' socket: '/var/lib/mysql/mysql.sock' port: 3306 MySQL Community Server (GPL) by Remi 121115 00:19:44 mysqld_safe Number of processes running now: 0 121115 00:19:44 mysqld_safe mysqld restarted 121115 0:19:47 [Note] Plugin 'FEDERATED' is disabled. 121115 0:19:47 InnoDB: The InnoDB memory heap is disabled 121115 0:19:47 InnoDB: Mutexes and rw_locks use GCC atomic builtins 121115 0:19:47 InnoDB: Compressed tables use zlib 1.2.3 121115 0:19:47 InnoDB: Using Linux native AIO 121115 0:19:47 InnoDB: Initializing buffer pool, size = 128.0M InnoDB: mmap(137363456 bytes) failed; errno 12 121115 0:19:47 InnoDB: Completed initialization of buffer pool 121115 0:19:47 InnoDB: Fatal error: cannot allocate memory for the buffer pool 121115 0:19:47 [ERROR] Plugin 'InnoDB' init function returned error. 121115 0:19:47 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 121115 0:19:47 [ERROR] Unknown/unsupported storage engine: InnoDB 121115 0:19:47 [ERROR] Aborting Edit #1 total used free shared buffers cached Mem: 496 370 126 0 24 110 -/+ buffers/cache: 234 261 Swap: 1023 9 1014 Edit #2 Also, largest table in my mysql is 20MB, so my the memory used should be pretty moderate. SELECT CONCAT(table_schema, '.', table_name), CONCAT(ROUND(table_rows / 1000000, 2), 'M') rows, CONCAT(ROUND(data_length / ( 1024 * 1024 * 1024 ), 2), 'G') DATA, CONCAT(ROUND(index_length / ( 1024 * 1024 * 1024 ), 2), 'G') idx, CONCAT(ROUND(( data_length + index_length ) / ( 1024 * 1024 * 1024 ), 2), 'G') total_size, ROUND(index_length / data_length, 2) idxfrac FROM information_schema.TABLES ORDER BY data_length + index_length DESC LIMIT 10;

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• Best non-development book for software developers

  - by Dima Malenko

  What is the best non software development related book that you think each software developer should read? Note, there is a similar, poll-style question here: What non-programming books should programmers read? Update: Peopleware is a great book, must read, no doubt. But it is about software development so does not count. Update: We ended up suggesting more than one book and that's great! Below is summary (with links to Amazon) of the books you should consider for your reading list. The Design of Everyday Things by Donald Norman Getting Things Done by David Allen Godel, Escher, Bach by Douglas R. Hofstadter The Goal and It's Not Luck by Eliyahu M. Goldratt Here Comes Everybody by Clay Shirky ...to be continued.

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• Roadblocks in creating a custom operating system

  - by Dinah

  It seems to me that the most common overly ambitious project that programmers (esp. Comp. Sci. grads) try to tackle is building your own operating system. (Trying to create your own programming language + compiler is probably even more common but not nearly as ambitious.) For those (like myself) foolish enough to try: aside from the sheer size, what are the biggest *gotcha*s or unexpected roadblocks you've encountered in trying to create your own OS from the ground up? Edit: A great OS question: http://stackoverflow.com/questions/43180/how-to-get-started-in-operating-system-development/

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• Create a permalink with Javascript

  - by Jon Romero

  I have a textbox where a user puts a string like this: "hello world! I think that __i__ am awesome (yes I am!)" I need to create a correct url like this: hello-world-i-think-that-i-am-awesome-yes-i-am How can be done using reg expressions? Also, is it possible to do it with Greek (for example)? "Ge?a s?? ??sµe" turns to geia-sou-kosme In other programming languages (python/ruby) I am using a translation array. Should I do the same here?

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• Resizing screenshots/screen captures for inclusion in Beamer

  - by Stephen

  Sorry, this may or may not be a programming question directly, but I am trying to resize screenshots with Imagemagick and Gimp to include in a Beamer presentation, but it comes out even blurrier than the resizing done by LaTeX. For instance, in Beamer I might have a command to rescale the image \includegraphics[width=.5\textwidth]{fig.png}. Using something like \begin{frame} \message{width = \the\textwidth} \message{height = \the\textheight} \end{frame} I have gotten the \textwidth and \textheight parameters in points (345.69548, 261.92444). So I have a script (in Python) that sends a system call to Imagemagick: 'convert %s -resize %.6f@ resized_%s' % (f,a,f) where a is calculated as \textwidth*\textheight*0.5**2. When I then go back into my Beamer presentation and include the resized figure, \includegraphics{resized_fig.png}, the size looks approximately correct but it's super-blurry. I also tried resizing in Gimp (using the GUI) but no luck either... help? Thanks...

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• Reading multiple Emacs info files simultaneously

  - by pajato0

  For reading programming (and other) documentation, the Emacs INFO mode is outstanding. So outstanding that I would like to be able to read say, the Emacs Lisp info file and the org-mode info files simultaneously without traversing back up to the beginning of the info tree. Either I've missed something obvious or I will need to hack some Emacs Lisp to achieve the goal. And yet again, someone may have already cracked this nut. So I guess my question is: what is the state of the practice for reading mulitple INFO files in Emacs simultaneously?

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• The Zen of Python distils the guiding principles for Python into 20 aphorisms but lists only 19. What's the twentieth?

  - by Jeff Walden

  From PEP 20, The Zen of Python: Long time Pythoneer Tim Peters succinctly channels the BDFL's guiding principles for Python's design into 20 aphorisms, only 19 of which have been written down. What is this twentieth aphorism? Does it exist, or is the reference merely a rhetorical device to make the reader think? (One potential answer that occurs to me is that "You aren't going to need it" is the remaining aphorism. If that were the case, it would both exist and act to make the reader think, and it would be characteristically playful, thus fitting the list all the better. But web searches suggest this to be an extreme programming mantra, not intrinsically Pythonic wisdom, so I'm stumped.)

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• Clojure editor/IDE recommendations on OS X

  - by Julien Chastang

  I am starting to learn the Clojure programming language. Are there any recommendations for Clojure editors/IDEs on OS X? Update 2009-9-23: The clojure space has changed tremendously since I originally posted this question. Many of the links below, especially those that refer to clojure-mode with emacs, are out-of-date. The best clojure IDE I found was the enclojure Netbeans plugin which was recently released (2009-08-25). Update 2010-4-30: Here is another very good link on this subject by Lau B. Jensen. Also, for my own clojure development, I have actually moved to emacs / swank-clojure.

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• Perl for a Python programmer

  - by fortran

  I know Python (and a bunch of other languages) and I think it might be nice to learn Perl, even if it seems that most of the people is doing it the other way around... My main concern is not about the language itself (I think that part is always easy), but about learning the Perlish (as contrasted with Pythonic) way of doing things; because I don't think it'll be worth the effort if I end up programming Python in Perl. So my questions are basically two: Are there many problems/application areas where it's actually more convenient to solve them in Perl rather than in Python? If the first question is positive, where can I found a good place to get started and learn best practices that is not oriented to beginners?

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• Ruby Summer of Code Project Ideas

  - by blatyo

  So, I'm thinking about applying for Ruby Summer of Code. However, I'm not sure what I want to propose. I was wondering if any of my fellow redditors had any good ideas? I've been programming in Ruby for about 3 years. I am primarily a web developer, but I do things related to bit torrent, data mining, and databases as well. I have a bit torrent related gem that I wrote for the hell of it. I've also got some projects on Github (username: blatyo). I am looking for ideas for me, but anything you can think of that would be awesome I would like to hear as well.

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• MySQL: Pacemaker cannot start the failed master as a new slave?

  - by quanta

  I'm going to setup failover for MySQL replication (1 master and 1 slave) follow this guide: https://github.com/jayjanssen/Percona-Pacemaker-Resource-Agents/blob/master/doc/PRM-setup-guide.rst Here're the output of crm configure show: node serving-6192 \ attributes p_mysql_mysql_master_IP="192.168.6.192" node svr184R-638.localdomain \ attributes p_mysql_mysql_master_IP="192.168.6.38" primitive p_mysql ocf:percona:mysql \ params config="/etc/my.cnf" pid="/var/run/mysqld/mysqld.pid" socket="/var/lib/mysql/mysql.sock" replication_user="repl" replication_passwd="x" test_user="test_user" test_passwd="x" \ op monitor interval="5s" role="Master" OCF_CHECK_LEVEL="1" \ op monitor interval="2s" role="Slave" timeout="30s" OCF_CHECK_LEVEL="1" \ op start interval="0" timeout="120s" \ op stop interval="0" timeout="120s" primitive writer_vip ocf:heartbeat:IPaddr2 \ params ip="192.168.6.8" cidr_netmask="32" \ op monitor interval="10s" \ meta is-managed="true" ms ms_MySQL p_mysql \ meta master-max="1" master-node-max="1" clone-max="2" clone-node-max="1" notify="true" globally-unique="false" target-role="Master" is-managed="true" colocation writer_vip_on_master inf: writer_vip ms_MySQL:Master order ms_MySQL_promote_before_vip inf: ms_MySQL:promote writer_vip:start property $id="cib-bootstrap-options" \ dc-version="1.0.12-unknown" \ cluster-infrastructure="openais" \ expected-quorum-votes="2" \ no-quorum-policy="ignore" \ stonith-enabled="false" \ last-lrm-refresh="1341801689" property $id="mysql_replication" \ p_mysql_REPL_INFO="192.168.6.192|mysql-bin.000006|338" crm_mon: Last updated: Mon Jul 9 10:30:01 2012 Stack: openais Current DC: serving-6192 - partition with quorum Version: 1.0.12-unknown 2 Nodes configured, 2 expected votes 2 Resources configured. ============ Online: [ serving-6192 svr184R-638.localdomain ] Master/Slave Set: ms_MySQL Masters: [ serving-6192 ] Slaves: [ svr184R-638.localdomain ] writer_vip (ocf::heartbeat:IPaddr2): Started serving-6192 Editing /etc/my.cnf on the serving-6192 of wrong syntax to test failover and it's working fine: svr184R-638.localdomain being promoted to become the master writer_vip switch to svr184R-638.localdomain Current state: Last updated: Mon Jul 9 10:35:57 2012 Stack: openais Current DC: serving-6192 - partition with quorum Version: 1.0.12-unknown 2 Nodes configured, 2 expected votes 2 Resources configured. ============ Online: [ serving-6192 svr184R-638.localdomain ] Master/Slave Set: ms_MySQL Masters: [ svr184R-638.localdomain ] Stopped: [ p_mysql:0 ] writer_vip (ocf::heartbeat:IPaddr2): Started svr184R-638.localdomain Failed actions: p_mysql:0_monitor_5000 (node=serving-6192, call=15, rc=7, status=complete): not running p_mysql:0_demote_0 (node=serving-6192, call=22, rc=7, status=complete): not running p_mysql:0_start_0 (node=serving-6192, call=26, rc=-2, status=Timed Out): unknown exec error Remove the wrong syntax from /etc/my.cnf on serving-6192, and restart corosync, what I would like to see is serving-6192 was started as a new slave but it doesn't: Failed actions: p_mysql:0_start_0 (node=serving-6192, call=4, rc=1, status=complete): unknown error Here're snippet of the logs which I'm suspecting: Jul 09 10:46:32 serving-6192 lrmd: [7321]: info: rsc:p_mysql:0:4: start Jul 09 10:46:32 serving-6192 lrmd: [7321]: info: RA output: (p_mysql:0:start:stderr) Error performing operation: The object/attribute does not exist Jul 09 10:46:32 serving-6192 crm_attribute: [7420]: info: Invoked: /usr/sbin/crm_attribute -N serving-6192 -l reboot --name readable -v 0 The full logs: http://fpaste.org/AyOZ/ The strange thing is I can starting it manually: export OCF_ROOT=/usr/lib/ocf export OCF_RESKEY_config="/etc/my.cnf" export OCF_RESKEY_pid="/var/run/mysqld/mysqld.pid" export OCF_RESKEY_socket="/var/lib/mysql/mysql.sock" export OCF_RESKEY_replication_user="repl" export OCF_RESKEY_replication_passwd="x" export OCF_RESKEY_test_user="test_user" export OCF_RESKEY_test_passwd="x" sh -x /usr/lib/ocf/resource.d/percona/mysql start: http://fpaste.org/RVGh/ Did I make something wrong?

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• Cannot run a VM with more than three network interfaces with KVM

  - by Bostonvaulter

  I'm running KVM on top of Ubuntu 10.10 Server I can create VM's (Virtual Machine) and network interfaces fine but I cannot seem to add more than three network interfaces. As soon as I have a VM with four network interfaces it gets stuck on startup at the starting SeaBIOS page with this message: Starting SeaBIOS (version pre-0.6.1-20100702_143500-palmer) So far I've verified this with two VM's, a Ubuntu 10.10 desktop and a Vyatta router. The specific network hardware I assign to the VM's doesn't seem to matter. I'm trying to have one bridged interface and three private networks using Vyatta to route between them. Does anyone know why I can't run a VM with more than three network interfaces? Edit: Additionally the KVM thread responsible for the specific VM hangs using ~100% CPU (i.e. one core). Here's the command for the process that is hanging: /usr/bin/kvm -S -M pc-0.12 -enable-kvm -m 512 -smp 1,sockets=1,cores=1,threads=1 -name vyatta -uuid 6dff7c94-6810-423e-5fea-fec10da0e9b7 -nodefaults -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/vyatta.monitor,server,nowait -mon chardev=monitor,mode=readline -rtc base=utc -boot c -drive file=/home/rams/virtual-machines/vyatta.img,if=none,id=drive-ide0-0-0,boot=on,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -device rtl8139,vlan=0,id=net0,mac=00:54:00:be:cc:4b,bus=pci.0,addr=0x3 -net tap,fd=97,vlan=0,name=hostnet0 -device rtl8139,vlan=1,id=net1,mac=52:54:00:da:59:ed,bus=pci.0,addr=0x5 -net tap,fd=98,vlan=1,name=hostnet1 -device rtl8139,vlan=2,id=net2,mac=52:54:00:ce:22:b6,bus=pci.0,addr=0x6 -net tap,fd=99,vlan=2,name=hostnet2 -device rtl8139,vlan=3,id=net3,mac=52:54:00:1e:bc:46,bus=pci.0,addr=0x7 -net tap,fd=101,vlan=3,name=hostnet3 -chardev pty,id=serial0 -device isa-serial,chardev=serial0 -usb -vnc 127.0.0.1:0 -k en-us -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 Edit: I've also found an error in dmesg that might be related (it also shows up when running virtd in verbose mode): 14:47:24.399: warning : qemudParsePCIDeviceStrs:1422 : Unexpected exit status '1', qemu probably failed I've also tried disabling app armor but that doesn't seem to make a difference.

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• String Formatting Tricks/Docs

  - by Meltemi

  Was reading the response by Shaggy Frog to this post and was intrigued by the following line of code: NSLog(@"%@", [NSString stringWithFormat:@"%@:%*s%5.2f", key, padding, " ", [object floatValue]]); I know string formatting is an age old art but I'm kinda doing the end around into Cocoa/Obj-C programming and skipped a few grades along the way. Where is a good (best) place to learn all the string formatting tricks allowed in NSString's stringWithFormat? I'm familiar with Apple's String Format Specifiers page but from what I can tell it doesn't shed light on whatever is happening with %*s or the %5.2f (not to mention the 3 apparent placeholders followed by 4 arguments) above?!?

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• Error Domain=SKErrorDomain Code=3 UserInfo=0x2a5a00 "Cannot connect to iTunes Store"

  - by SKk

  I am trying to implement InApp purchase in my application. I have implemented it as per Apple's programming guide and it(code) was working fine until I created new application, appid, provisioning profile and in-app products @ another developer account. Now, it gives me following error. Error Domain=SKErrorDomain Code=3 UserInfo=0x2a5a00 "Cannot connect to iTunes Store" Same code works fine if I use previous developer account's appid, pro-certificate and product ids. This is very strange issue, I double checked product id names and other things still facing same error. Any clue..?

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• Career advice for a frustrated newbie programmer.

  - by Satoru.Logic

  Hi, all. This is my first year as a programmer. The programming language that I'm most familiar with is Python. I am maintaining a web2py based legacy system, alone, which means I have to grow up as an all-rounder. The original programmers on this project are nowhere to find, and there are hardly any usable documents about requirements or anything. I find it very frustrating every time I hear the users criticize the system, and I can't help explaining that "that was not my fault, those mess was there even before I entered this company." I wonder what should I do with this situation. Please give me some advice, thanks in advance.

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• Relating NP-Complete problems to real world problems

  - by terru

  I have a decent grasp of NP Complete problems; that's not the issue. What I don't have is a good sense of where they turn up in "real" programming. Some (like knapsack and traveling salesman) are obvious, but others don't seem obviously connected to "real" problems. I've had the experience several times of struggling with a difficult problem only to realize it is a well known NP Complete problem that has been researched extensively. If I had recognized the connection more quickly I could have saved quite a bit of time researching existing solutions to my specific problem. Are there any resources (online or print) that specifically connect NP Complete to real world instances?

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• Touchscreen using sound input?

  - by ricardowong

  Hi, i don't really know if it is actually possible, but i believe that it can be made. How possible is it to make a program that recognizes different sound bouncing from the screen and turn it into a position that will obviously be later fed to the mouse. I know that it sounds kind of dumb, but lately i've been noticing that a very dull, strong sound is made when touching the screen, and that sound varies when doing so at different positions. Probably the microphone "hears" differently because the screen acts as a drum with the casing. Anyways, what do you think, anyone has any experience programming with sound?

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• MySQL: Replicating the MySQL database

  - by Lee

  Hi guys, I have a primary write server (server1) which replications to two servers (server2 and server3) which are query servers. I am replicating all databases to these servers including the MySQL database. When i execute a GRANT as follows replication works perfectly.. GRANT execute,select ON database1.* TO `user1`@`host` IDENTIFIED BY 'password'; However if i did the same GRANT to alter permissions on an existing user without IDENTIFIED clause replication breaks.. Error 'Can't find any matching row in the user table' on query. Default database: 'mysql'. Query: 'GRANT execute,select ON database1.* TO `user`@`host`' If I try and run the query manually i get the same error.. Server 1: mysql> SHOW VARIABLES LIKE "%version%"; +-------------------------+------------------------------------------------------------+ | Variable_name | Value | +-------------------------+------------------------------------------------------------+ | protocol_version | 10 | | version | 5.0.77-log | **my.cnf** [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql old_passwords=1 symbolic-links=0 max_allowed_packet = 100M log-bin = /var/lib/mysql/logs/borg-binlog.log max_binlog_size=50M expire_logs_days=7 [mysql.server] user=mysql basedir=/var/lib [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid Server 2: mysql> SHOW VARIABLES LIKE "%version%"; +-------------------------+------------------------------------------------------------+ | Variable_name | Value | +-------------------------+------------------------------------------------------------+ | protocol_version | 10 | | version | 5.0.77-log | my.cnf server-id=12 master-host=x master-user=x master-password=x master-connect-retry=60 relay-log=/var/lib/mysql/borg-relay.log relay-log-index=/var/lib/mysql/borg-relay-log.index Thanks for taking a look Edit: Currently its running fine, until you do the grant which breaks it... mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.128.0.5 Master_User: repli-ragnarok Master_Port: 3306 Connect_Retry: 60 Master_Log_File: borg-binlog.002730 Read_Master_Log_Pos: 4375760 Relay_Log_File: borg-relay.005489 Relay_Log_Pos: 4375899 Relay_Master_Log_File: borg-binlog.002730 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 4375760 Relay_Log_Space: 4375899 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 1 row in set (0.00 sec) Edit: Broken show slave status from history +----------------------------------+-------------+----------------+-------------+---------------+--------------------+---------------------+-------------------+---------------+-----------------------+------------------+-------------------+-----------------+---------------------+--------------------+------------------------+-------------------------+-----------------------------+------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------+---------------------+-----------------+-----------------+----------------+---------------+--------------------+--------------------+--------------------+-----------------+-------------------+----------------+-----------------------+ | Slave_IO_State | Master_Host | Master_User | Master_Port | Connect_Retry | Master_Log_File | Read_Master_Log_Pos | Relay_Log_File | Relay_Log_Pos | Relay_Master_Log_File | Slave_IO_Running | Slave_SQL_Running | Replicate_Do_DB | Replicate_Ignore_DB | Replicate_Do_Table | Replicate_Ignore_Table | Replicate_Wild_Do_Table | Replicate_Wild_Ignore_Table | Last_Errno | Last_Error | Skip_Counter | Exec_Master_Log_Pos | Relay_Log_Space | Until_Condition | Until_Log_File | Until_Log_Pos | Master_SSL_Allowed | Master_SSL_CA_File | Master_SSL_CA_Path | Master_SSL_Cert | Master_SSL_Cipher | Master_SSL_Key | Seconds_Behind_Master | +----------------------------------+-------------+----------------+-------------+---------------+--------------------+---------------------+-------------------+---------------+-----------------------+------------------+-------------------+-----------------+---------------------+--------------------+------------------------+-------------------------+-----------------------------+------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------+---------------------+-----------------+-----------------+----------------+---------------+--------------------+--------------------+--------------------+-----------------+-------------------+----------------+-----------------------+ | Waiting for master to send event | 10.128.0.5 | repli-valhalla | 3306 | 60 | borg-binlog.002729 | 40429793 | borg-relay.005486 | 40311514 | borg-binlog.002729 | Yes | No | | | | | | | 1133 | Error 'Can't find any matching row in the user table' on query. Default database: 'mysql'. Query: 'GRANT execute,select ON auth_tracker.* TO `mail-sin1`@`%.sin1.netline.net.uk` IDENTIFIED BY 'mail-sin1666'' | 0 | 40311375 | 40429932 | None | | 0 | No | | | | | | NULL | +----------------------------------+-------------+----------------+-------------+---------------+--------------------+---------------------+-------------------+---------------+-----------------------+------------------+-------------------+-----------------+---------------------+--------------------+------------------------+-------------------------+-----------------------------+------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------+---------------------+-----------------+-----------------+----------------+---------------+--------------------+--------------------+--------------------+-----------------+-------------------+----------------+-----------------------+ 1 row in set (0.06 sec)

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• libvirt qemu/kvm migration problem

  - by Panda

  I am using kvm and libvirt on my Dell server. Now i am trying to migrate one virtual machine from a physical server to another. However, I failed everytime. In virsh on physicalServer1, I typed: virsh # migrate virtualmachine1 qemu+ssh://username@physicalServer2/system error: operation failed: migration to 'tcp:physicalServer2:49163' failed: migration failed Then I searched FAQ part on libvirt.org. It says: error: operation failed: migration to '...' failed: migration failed This is an error often encountered when trying to migrate with QEMU/KVM. This typically happens with plain migration, when the source VM cannot connect to the destination host. You will want to make sure your hosts are properly configured for migration (see the migration section of this FAQ) I managed to ssh physicalServer2 from a shell on virtualmachine1 so the above red part did not explain my failure. I also open ports on physicalServer2, iptables -L shows following information: Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT udp -- anywhere anywhere udp dpt:domain ACCEPT tcp -- anywhere anywhere tcp dpt:domain ACCEPT udp -- anywhere anywhere udp dpt:bootps ACCEPT tcp -- anywhere anywhere tcp dpt:bootps ACCEPT udp -- anywhere anywhere udp dpt:domain ACCEPT tcp -- anywhere anywhere tcp dpt:domain ACCEPT udp -- anywhere anywhere udp dpt:bootps ACCEPT tcp -- anywhere anywhere tcp dpt:bootps ACCEPT tcp -- anywhere anywhere state NEW tcp dpts:49152:49215 Chain FORWARD (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere 192.168.122.0/24 state RELATED,ESTABLISHED ACCEPT all -- 192.168.122.0/24 anywhere ACCEPT all -- anywhere anywhere REJECT all -- anywhere anywhere reject-with icmp-port-unreachable REJECT all -- anywhere anywhere reject-with icmp-port-unreachable ACCEPT all -- anywhere 192.168.122.0/24 state RELATED,ESTABLISHED ACCEPT all -- 192.168.122.0/24 anywhere ACCEPT all -- anywhere anywhere REJECT all -- anywhere anywhere reject-with icmp-port-unreachable REJECT all -- anywhere anywhere reject-with icmp-port-unreachable Chain OUTPUT (policy ACCEPT) target prot opt source destination The /var/log/libvirt/qemu/virtualmachine1.log on physicalServer2: 2011-05-06 13:37:30.708: starting up LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/kvm -S -M pc-0.14 -enable-kvm -m 2048 -smp 1,sockets=1,cores=1,threads=1 -name openjudge-test -uuid a8c704bc-a4f9-90db-3e57-40e60b00aac1 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/virtualmachine1.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=readline -rtc base=utc -boot c -drive file=/media/nfs/virtualmachine1.img,if=none,id=drive-ide0-0-0,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=20,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=00:16:36:8a:22 :a0,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -usb -vnc 127.0.0.1:2 -vga cirrus -incoming tcp:0.0.0.0:49163 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 char device redirected to /dev/pts/0 2011-05-06 13:37:30.915: shutting down The /var/log/libvirt/qemu/virtualmachine1.log on physicalServer1 is empty. Both physical servers are using Ubuntu 11.04. The libvirt and kvm used are installed by apt-get. The libvirt version is 0.8.8.

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• Low framerate on background apps

  - by user1698923

  My problem is that when a game is running in the foreground, in Full Screen mode, any applications on my second monitor (such as youtube videos, videos, not app specific) drop their frame-rate to about 2-3 FPS. It seems like some sort of power management option that I can't track down. As far as I can tell, it's not due to the GPU not being able to keep up. For instance, my PC can play League of Legends at about 280FPS when the framerate is uncapped. If i cap it at 60FPS using the in-game option, it has no affect on the performance of the background app. Summary Operating System Windows 8 Pro 64-bit CPU Intel Core i7 3820 @ 3.60GHz 42 °C Sandy Bridge-E 32nm Technology RAM 12.0GB Triple-Channel DDR3 @ 533MHz (7-7-7-20) Motherboard Gigabyte Technology Co., Ltd. X79-UD3 (SOCKET 0) 37 °C Graphics DELL U2713HM (2560x1440@59Hz) DELL U2713HM (2560x1440@59Hz) 1280MB NVIDIA GeForce GTX 570 (Gigabyte) 58 °C Hard Drives 212GB Volume0 (RAID) 1863GB Western Digital WDC WD20EARS-00MVWB0 (SATA) 36 °C 1863GB Western Digital WDC WD20EARS-00MVWB0 (SATA) 34 °C Optical Drives No optical disk drives detected Audio ASUS Xonar Essence STX Audio Device Operating System Windows 8 Pro 64-bit Computer type: Desktop Graphics Monitor 1 Name DELL U2713HM on NVIDIA GeForce GTX 570 Current Resolution 2560x1440 pixels Work Resolution 2560x1400 pixels State Enabled, Output devices support Multiple displays Extended, Secondary, Enabled Monitor Width 2560 Monitor Height 1440 Monitor BPP 32 bits per pixel Monitor Frequency 59 Hz Device \\.\DISPLAY4\Monitor0 Monitor 2 Name DELL U2713HM on NVIDIA GeForce GTX 570 Current Resolution 2560x1440 pixels Work Resolution 2560x1400 pixels State Enabled, Output devices support Multiple displays Extended, Primary, Enabled Monitor Width 2560 Monitor Height 1440 Monitor BPP 32 bits per pixel Monitor Frequency 59 Hz Device \\.\DISPLAY5\Monitor0 NVIDIA GeForce GTX 570 Manufacturer NVIDIA Model GeForce GTX 570 GPU GF110 Device ID 10DE-1086 Revision A2 Subvendor Gigabyte (1458) Series GeForce GTX 500 Current Performance Level Level 3 Current GPU Clock 845 MHz Current Memory Clock 1900 MHz Current Shader Clock 1690 MHz Voltage 0.988 V Technology 40 nm Die Size 520 mm² Release Date Dec 07, 2010 DirectX Support 11.0 OpenGL Support 5.0 Bus Interface PCI Express x16 Temperature 57 °C Driver version 9.18.13.2018 BIOS Version 70.10.55.00.01 ROPs 40 Shaders 512 unified Memory Type GDDR5 Memory 1280 MB Bus Width 64x5 (320 bit) Filtering Modes 16x Anisotropic Noise Level Moderate Max Power Draw 219 Watts Count of performance levels : 3 Level 1 - "Default" GPU Clock 50 MHz Memory Clock 135 MHz Shader Clock 101 MHz Level 2 - "2D Desktop" GPU Clock 405 MHz Memory Clock 324 MHz Shader Clock 810 MHz Level 3 - "3D Applications" GPU Clock 845 MHz Memory Clock 1900 MHz Shader Clock 1690 MHz Things I've tried: 1) Updating the graphics driver 2) Setting windows power mode to High Performance 3) Reset Nvidia Global Performance settings to default

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