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Articles indexed Tuesday December 18 2012

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• Does low latency code sometimes have to be "ugly"?

  - by user997112

  (This is mainly aimed at those who have specific knowledge of low latency systems, to avoid people just answering with unsubstantiated opinions). Do you feel there is a trade-off between writing "nice" object orientated code and writing very fast low latency code? For instance, avoiding virtual functions in C++/the overhead of polymorphism etc- re-writing code which looks nasty, but is very fast etc? It stands to reason- who cares if it looks ugly (so long as its maintainable)- if you need speed, you need speed? I would be interested to hear from people who have worked in such areas.

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• What steps/tools/apps are necessary to make local php development on a tablet viable?

  - by Tchalvak

  I do my php web development locally, as in, creating a local instance of a site and then coding it and then pushing code to servers via git/github. I'm considering getting an android tablet or ipad and a wireless keyboard for very mobile development, but I in no way want to go back to the bad old days of using ftp and syncing up code changes on a development server directly, that would be too much of a trade-off to interest me. Is there enough support for the stack to develop php websites locally on a tablet? Anyone had experience trying this sort of thing?

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• Why does Zend discourage "floating functions"?

  - by kojiro

  Zend's Coding Standard Naming Convention says Functions in the global scope (a.k.a "floating functions") are permitted but discouraged in most cases. Consider wrapping these functions in a static class. The common wisdom in Python says practically the opposite: Finally, use staticmethod sparingly! There are very few situations where static-methods are necessary in Python, and I've seen them used many times where a separate "top-level" function would have been clearer. (Not only does the above StackOverflow answer warn against overuse of static methods, but more than one Python linter will warn the same.) Is this something that can be generalized across programming languages, and if so, why does Python differ so from PHP? If it's not something that can be generalized, what is the basis for one approach or the other, and is there a way to immediately recognize in a language whether you should prefer bare functions or static methods?

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• Is asking for control totals on a file an outdated means of verifying a file?

  - by CTKeane

  I'm in a new position where I need to process a flat files on a regular basis. The last time I did this was 5 or 6 years ago but as part of the file layout I received control totals. It gave me simplistic information on the file like the total number of records as well as sums of the important fields. This helped me during testing then also during production to verify the file arrived and has correct information. I have asked for similar data for this new project and have hit a wall of no. Is this no longer a standard practice? Is there a better way?

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• How are video card\graphics drivers written exactly? [closed]

  - by Bigyellow Bastion

  I was thinking, since I want an application layer for my operating system, how or what would be the best way to write, or better understand how to write, my own graphics device drivers or software to enable application layered software to request data through my graphics system (I.e. windows, icons, mouse pointers). I don't need every little detail, I'd just like some possible insight on the procedure one may accomplish this feat in, perhaps the best way to understand the interaction between the graphics GUI rendering software to the hardware interaction directly, and the application software requesting the graphics driver itself.

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• How to correct a junior, but encourage him to think for himself? [closed]

  - by Phil

  I am the lead of a small team where everyone has less than a year of software development experience. I wouldn't by any means call myself a software guru, but I have learned a few things in the few years that I've been writing software. When we do code reviews I do a fair bit of teaching and correcting mistakes. I will say things like "This is overly complex and convoluted, and here's why," or "What do you think about moving this method into a separate class?" I am extra careful to communicate that if they have questions or dissenting opinions, that's ok and we need to discuss. Every time I correct someone, I ask "What do you think?" or something similar. However they rarely if ever disagree or ask why. And lately I've been noticing more blatant signs that they are blindly agreeing with my statements and not forming opinions of their own. I need a team who can learn to do things right autonomously, not just follow instructions. How does one correct a junior developer, but still encourage him to think for himself? Edit: Here's an example of one of these obvious signs that they're not forming their own opinions: Me: I like your idea of creating an extension method, but I don't like how you passed a large complex lambda as a parameter. The lambda forces others to know too much about the method's implementation. Junior (after misunderstanding me): Yes, I totally agree. We should not use extension methods here because they force other developers to know too much about the implementation. There was a misunderstanding, and that has been dealt with. But there was not even an OUNCE of logic in his statement! He thought he was regurgitating my logic back to me, thinking it would make sense when really he had no clue why he was saying it.

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• Pointless Code In Your Source

  - by Ali

  I've heard stories of this from senior coders and I've seen some of it myself. It seems that there are more than a few instances of programmers writing pointless code. I will see things like: Method or function calls that do nothing of value. Redundant checks done in a separate class file, object or method. if statements that always evaluate to true. Threads that spin off and do nothing of note. Just to name a few. I've been told that this is because programmers want to intentionally make the code confusing to raise their own worth to the organization or make sure of repeat business in the case of contractual or outsourced work. My question is. Has anyone else seen code like this? What was your conclusion was to why that code was there? If anyone has written code like this, can you share why?

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• How can I avoid the engineering mistakes of PDT?

  - by ashy_32bit

  As a developer with enough experience to evaluate a tool, I may say that PDT is very huge in size and slow in performance for a PHP IDE. It gets bigger by release and exponentially slower by the size of the projects. Add some extra syntax coloring rules and it literally crawls, code completion works randomly and building workspace takes like forever. Java black magic (-Xmx etc) eases the pain a little but that's it. So my questions are: Why is PDT like this? What design or engineering factors led to its poor performance? How can I avoid making these same mistakes in my own products?

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• How to measure his own skill in a programming language? [closed]

  - by lollancf37

  Possible Duplicate: How Can I Know Whether I Am a Good Programmer? As many programmers I have worked in several languages. While of course there are some that I am more at ease than other, I do not have a real way to precisely measure my skill in a specific language. So I thought of a system which allows me to help me with that. I am looking for 5 common criteria in programming languages, to which I will have a value from 1 (junior) to 4 ( Senior) to represent my skill. I however have no real idea of the criteria I should choose for that. Does anybody have suggestion ? Thanks.

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• Is programming a SubCulture? [closed]

  - by Trufa

  I was going through this article: http://en.wikipedia.org/wiki/Subculture Which got mee thinking is programming a subculture? After the a while I started thinking it really hard, and if you go really in depth this is a very complex and interesting question to ask. YOu can even ask yourself if (heavy) internet (social) users are an subculture and programmers a culture within. I think it might be an interesting discussion, hope you like it! NOTE: I linked the wiki article because it might be a good baseline, maybe you can base you answer on Ken Gelder´s proposal to distinguish subcultures. But it should be based on a little bit more that intuition. Thanks in advance! Trufa

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• How would you rank these programming skills in order of learning them? [closed]

  - by mumtaz

  As a general purpose programmer, what should you learn first and what should you learn later on? Here are some skills I wonder about... SQL Regular Expressions Multi-threading / Concurrency Functional Programming Graphics The mastery of your mother programming language's syntax/semantics/featureset The mastery of your base class framework libraries Version Control System Unit Testing XML Do you know other important ones? Please specify them... On which skills should I focus first?

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• I can't boot Lubuntu 12.10 on my iMac G3?

  - by Devon

  I downloaded lubuntu-12.10-alternate-powerpc.iso and burned it to a CD then installed it perfectly, like so then when I went to boot it up I got all the way to the boot screen, then after about 10 - 15 seconds it would disappear and the screen would stay black forever.. I captured it on video and uploaded it to YouTube so that you guys could see what I see. http://www.youtube.com/watch?v=puMbXeLNuTU I installed this on my slot-loading iMac G3 (indigo) with 512MB.

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• Fail to upgrade from 10.10 to 11.04

  - by Ana Solís

  I was using Natty for a while, but while updating to the new release there was a blackout and it wasn't able to finish and Ubuntu failed to load after that. I thought, no worries I got my files backed up and I still got my 10.10 CD I used to put Ubuntu in my computer in the first place. So I installed it again, with the plan of using the update manager to get myself with the current release... Except I get this error: W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/natty/main/source/Sources.gz 404 Not Found , W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/natty/main/binary-amd64/Packages.gz 404 Not Found , E:Some index files failed to download, they have been ignored, or old ones used instead. My internet connection is just fine, seeing as I'm able to post this, but I don't know what else to do. Tried to download Quantal in another computer and putting it on a DVD (since it won't fit in a CD...) and the stupid thing fails to load it, it skips it over and goes right back to Maverick... (not a faulty disk, it installed Ubuntu just fine in a friends computer...)

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• Booting Error while using 12.04 booting from GRUB

  - by Paul Z.

  my name is Paul. I have encountered an issue relating to GRUB booting and the booting process in general. I have been running Ubuntu 12.04 LTS on my machine for quite a while. Before that, i had (before) 10.04, 11.04, 11.10, etc. I have been running Ubuntu, in general, but more specifically 12.04 for a long time with little to no problems. The problem: Earlier today, i was using my machine and then decided to take a little break. I shut down my machine (laptop, in case anyone was wondering) and left. Later, I came back ready to start it up and continue. I started it up and it took me to the Toshiba screen (like normal) then to the GRUB screen. I guessed that nothing was truly wrong, and chose the first option (something around the lines of: Ubuntu, with linux 3.22.0-35-generic). I waited for a bit and it still displayed the same purple screen. I restarted it and now chose the option like the first but with recovery at the end. Same result. Later, I waited longer and found that my computer came up with a bunch of lines of script. I waited longer but nothing new happened. What are your suggestions as to fix this problem? I will let my computer run overnight with the recovery setting and will let you know what the result is. Until then, please help. Thank you, your time and effort is greatly appreciated!

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• Hard drive skipped in boot

  - by Yasin

  Good evening. I just installed Ubuntu 12.04 using a USB, but right after the install, after restarting the machine, I get a message asking me to insert a bootable drive. My boot settings in Bios have the hard drive first, then DVD, then USB stick, and I have two systems installed, Windows 7 and Ubuntu 12.04. I suspected the hard drive got somehow disconnected internally, so I checked but everything was in place. I used the live USB to start Ubuntu, and I could see the hard drive and mount whatever partition I wanted. The one that contains the recently installed Ubuntu, looks the same. (It hasn't been deleted or anything). I'm not sure if this is a hardware problem or a loader(grub) problem, because the hard drive is visible. Only it isn't seen by the BIOS. My only means of internet connection is a USB modem, which doesn't work when I'm using the live USB, so I have can't download anything from the internet, in case someone asks. I also reinstalled Ubuntu 12.04, to no avail. This is my second problem with this laptop, and Ubuntu, and it's not even a week old. I hope this one gets solved. Thank you.

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• Installing 12.10 on Dell r710

  - by user115490

  I have been trying to install Ubuntu 12.10 on a Dell r710. I have 6 disks in each 2 TB. I setup a raid 5 in the HW raid controller with all drives, and proceeded with the OS install. When the partitioner runs it fails to create / for some reason. I then tried just setting up a simple raid 1 with 2 drives in the HW controller, and doing the OS install again. The installer runs fine this time. Once trying to boot I then get a kernel panic of 'Target File System doesn't have requested /sbin/init' as well as a bunch of 'deleted inode referenced'. Can someone tell me what I am doing wrong here?

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• Disable automount in Nautilus

  - by jimmybondy

  I have added my mount devices in /etc/fstab and they get correctly mounted (2nd partition with ntfs and nas-share with nfs). I have also disabled automount in Nautilus preferences by using dconf-editor (following this post): user@server:~$ gsettings list-recursively org.gnome.desktop.media-handling org.gnome.desktop.media-handling automount false org.gnome.desktop.media-handling automount-open false org.gnome.desktop.media-handling autorun-never false Now i see every mount device twice in Nautilus (the entry in fstab already mounted). When clicking on the other entry i get the eligible message mount.nfs: /media/nas_share is busy or already mounted How i can i disable the appearente of those devices in Nautilus? EDIT Regarding automount: I have only one line in /etc/auto.master: +auto.master

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• What is the most reliable WiFi card?

  - by Kim Prince

  Which WiFi card is most reliable with Ubuntu, in particular V12.04? I have a ASUS PCE-N15 card which is dropping out intermittently. It has the RTL8188CE chipset, and I see that plenty of others have had a problem with this same chipset. I have tried building the custom drivers and a few other fixes, but still not reliable. So, I need to race out another card ASAP, but which card to buy? (I don't just want to select from the Ubuntu components list, since it is not infallible. For example, it says the RTL8188CE chips set works). Thanks!

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• Disabling eth0 Module on a Macbook Aluminum

  - by user115488

  The Ubuntu page for my device states the following at the bottom (Known Issues) PowerTOP reports that the module for the 10/100/1000 interface wakes the processor 100+x/sec, accounting for 50% of wakeups on an idle system. This dramatically shortens battery life. One potential solution is to unload this module if you only use wireless. I only use wireless, but I could not find instructions to "unload the module". I have a feeling if I try something related to this, but not the same, battery life will not improve and my eth0 won't work. Anyone have a good guide on this?

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• Can I prevent an IDENTIFY PACKET DEVICE command to a specific device at boot?

  - by Brian Spisak

  This is related to a previous question related to installation that is now resolved. I'm opening a new question, because I still need to get my DVD drive working. Problem: Failed boot when my ASUS DRW-24B1/ST DVD drive is attached to my asmedia ASM1061. Symptom: ata8.00: exception Emask 0x52 Sact 0x0 SErr 0xffffffff action 0xe frozen ata8: SError: { blah blah } ata8.00: failed command: IDENTIFY PACKET DEVICE ata8.00: cmd blah blah res blah blah (ATA bus error) ata8.00: status: { DRDY } ata8: hard resetting link Background: The ASM1061 is a PCIe to SATA bridge providing 2 x 6Gb/s ports and is supposed to be fully compliant to SATA specs. I just discovered in the fine print of my ASUS P8Z77-V pro motherboard that "These SATA ports are for data hard drivers only. ATAPI devices are not supported." However, I have already installed Windows 7 using this drive and I can run the Ubuntu 12.04 installer from it as well. The only time I have a problem is during Ubuntu boot when it tries an IDENTIFY PACKET DEVICE which seems to be an ATAPI command. I can't simply switch this device to another SATA port because they are already allocated to other devices. (My chipset's 2 x 6Gb/s are connected to my boot SSD and a fast HDD while the 4 x 3Gb/s ports are running a RAID 5 array.) If this can't be fixed or worked around, I suppose I'll have to go buy SATA add-in card. Blech. Thoughts: If indeed this is a device specific issue (that it doesn't support ATAPI discovery) then I can't expect - is it udev? - to work with it. But, it seems that Windows and even the Ubuntu installer work just fine. So why does udev have a problem? At the end of the day, it would be nice to have the DVD working under Ubuntu, but I can live without it. But, as this is a dual-boot machine, I can't physically disconnect it because I want it to work with Windows. (And physically disconnecting it every time I want to boot Ubuntu is NOT an option. ;-) Questions: Should this be considered a bug? My feelings are that if it works with other OS that it should probably work with Ubuntu as well. How can I work around this problem? I have a limited knowledge of linux internals, but it seems I should be able to somehow tell udev (or whatever is doing the discovery) to ignore that device. Is there a way?

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• WiFi is painfully slow, sometimes stops altogether

  - by Zelda64fan

  Lately my WiFi connection has been quite slow, and sometimes I lose my internet connection altogether (but the computer does not actually disconnect from the WiFi network). This only affects my laptop and only when it's running Ubuntu, so I think it must be a problem with Ubuntu. I haven't changed anything recently; this is on 12.10 64-bit. What could it be? Update: It's doing this now. The connection isn't completely dead, it's just staying under 5 kB/s. Still frustrating though. It also seems to affect all users.

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• Jumping Login Box after Lighdm Multiple Monitor workaround

  - by Tom Gamon

  So I used this workaround to sort my resolution at the login screen when using multiple monitors with Lightdm. #!/bin/bash XCOM0=`xrandr -q | grep 'VGA1 connected'` XCOM1=`xrandr --output LVDS1 --primary --auto --output VGA1 --auto --right-of LVDS1` XCOM2=`xrandr --output LVDS1 --primary --auto` # if the external monitor is connected, then we tell XRANDR to set up an extended desktop if [ -n "$XCOM0" ] || [ ! "$XCOM0" = "" ]; then echo $XCOM1 # if the external monitor is disconnected, then we tell XRANDR to output only to the laptop screen else echo $XCOM2 fi exit 0; Found Here: How to force Multiple Monitors correct resolutions for LightDM? It works great. However, now when I am on my login screen, the login box seems to jump to between the two displays. Any advice as to how I could make it stay on one display? Thanks

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• Ubuntu 12.10 Wine Crash Error Help

  - by Hao

  I'm trying to get wine to work for Hawken. I used winetricks and installed all the necessary components. Wine works fine with other games I have installed but when I try to run Hawken it crashes while loading with the following error: fixme:iphlpapi:CancelIPChangeNotify (overlapped 0xf2afb8): stub I'm new to Ubuntu so I have no idea how to fix this. Any help would be much appreciated. *Update: I've done some backtracking and it seems that this error is caused by the launcher not wine itself.

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• automount smb share customization

  - by Douda

  as a new linux user, used Ubuntu 12.10, I tried several tweaks with the SMB shares. I followed this tutorial to mount permanently 4 SMB shares from my local NAS. To resume, I : edit /etc/fstab added a line like : //servername/sharename /media/windowsshare cifs credentials=/home/ubuntuusername/.smbcredentials,iocharset=utf8,file_mode=0777,dir_mode=0777 0 0 created a credentials file for security reasons in my home folder (explained in the tutorial) ~/.smbcredentials It work perfectly, they are automounted on each reboot, but when I logon, I all the time get 4 file explorer open with each share. It is possible to avoid these file explorer window to be opened on every reboot ? I guess it's related to X or via a explicit deny or these graphical mount, but I don't have any clues on how to proceed Thank you for your time,

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• Logs are written to *.log.1 instead of *.log

  - by funkadelic

  For some reason my log files are writing to the *.log.1 files instead of the *.log files, e.g. for my Postfix log files it is writing to /var/log/mail.log.1 and not /var/log/mail.log as expected. Same goes for mail.err. It looks like it's also doing it for auth.log and syslog. Here is a ls -lt snippet of my /var/log directory, showing the more recently touched log files in reverse chronological order -rw-r----- 1 syslog adm 4608882 Dec 18 12:12 auth.log.1 -rw-r----- 1 syslog adm 4445258 Dec 18 12:12 syslog.1 -rw-r----- 1 syslog adm 2687708 Dec 18 12:11 mail.log.1 -rw-r----- 1 root adm 223033 Dec 18 12:04 denyhosts -rw-r--r-- 1 root root 56631 Dec 18 11:40 dpkg.log -rw-rw-r-- 1 root utmp 292584 Dec 18 11:39 lastlog -rw-rw-r-- 1 root utmp 9216 Dec 18 11:39 wtmp ... And ls -l mail.log*: -rw-r----- 1 syslog adm 0 Dec 16 06:31 mail.log -rw-r----- 1 syslog adm 2699809 Dec 18 12:28 mail.log.1 -rw-r----- 1 syslog adm 331704 Dec 9 06:45 mail.log.2.gz -rw-r----- 1 syslog adm 235751 Dec 2 06:40 mail.log.3.gz Is there something that is misconfigured? I tried restarting postfix and it still wrote to mail.log.1 afterwards (same with a postix stop; postfix start, too).

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