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• Random touchpad and keyboard freezes on new 10.10 installation

  - by ancaleth

  My touchpad and keyboard freeze up on my newly installed Ubuntu 10.10. I was using Ubuntu 10.4 via wubi before on this Laptop where this problem never occurred. (I did not migrate wubi or upgrade to 10.10, it's a fresh start. 64-bit on Dell Studio, plenty of RAM, plenty of free space on partition etc.) I can't say there is a pattern yet, once it happened during the download of packages with the Update Manager, once it was just using Firefox, no other program running. I was forced to shut down manually. In between these crashes the laptop was booted once, updates were installed etc., firefox was used and there weren't any problems. Both crashes should be in the attached kern.log and I noticed there were some error problems before the last crash (at the end, obviously). It seems the wireless was experiencing problems. This wasn't noticed on the user end, since the touchpad + keyboard were already frozen. kern.log: http://paste.ubuntu.com/552617/ How can the freezes be fixed?

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• How to disable discrete GPU using NVIDIA drivers?

  - by penzoiders

  I have a DELL studio XPS 13 (aka 1340) as of 12.04 most things run smoothly out of the box, but I have some power draining and warmness issues (if not to be called terrible heat issues) The system came with a NVIDIA GeForce 9500M (which has Hybrid SLI) and it shows up in "lspci" as these 2 cards 02:00.0 VGA compatible controller: NVIDIA Corporation G98 [GeForce 9200M GS] (rev a1) 03:00.0 VGA compatible controller: NVIDIA Corporation C79 [GeForce 9400M G] (rev b1) I had to install nvidia-current over noveau driver 'cause noveau does freeze the system after suspension. By installing nvidia-current and running nvidia-xconfig the resume process after suspension is fixed. By the way both with nvidia-current and noveau the system drains a lot of battery and heats up a lot. I suppose this is because the discrete GPU is always on. I don't really need 3D graphics on this system, if not the minimal to run unity and compiz for window management. So my question is: How do I disable, using nvidia-current, the discrete GPU 9200M and use only the integrated one 9400M? notes: In BIOS I have no option to disable discrete GPU This I think is not applicable because of the suspension-freeze issue (with noveau): https://help.ubuntu.com/community/HybridGraphics I've found this but I don't know which --sli option I should choose to fit my needs: http://manpages.ubuntu.com/manpages/hardy/man1/nvidia-xconfig.1.html My system has not optimus or cuda, but anyone can tell me if bumblebee can work for me?

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• Ubuntu won't log in after update

  - by Dave M G

  I just updated Ubuntu about 15 minutes ago on my desktop which is running 12.04. Within the set of updates, there were some kernel upgrades. It didn't say I needed to reboot after the update was finished, but I thought I would anyway. The computer successfully rebooted up to the login screen. However, after entering my password, the screen goes black for a moment, then it comes back to the login screen. I tried the suggestions in this question, but unfortunately they didn't help. In the accepted answer, the questioner vaguely says it was a "Unity problem". I'm using Gnome-classic with full Compiz effects. I tried uninstalling and reinstalling Compiz, but that didn't fix anything. So... I can't use my desktop computer until this is fixed. I hope there is some help soon. I've uploaded the output of cat /var/log/Xorg.0.log to Pastebin. A temporary solution of changing to gdm instead of lightdm was found with help in the chat room.

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• Problems after installing a plethora of updates

  - by box

  yesterday I decided to install 32-bit Ubuntu on my 64-bit desktop, first of all, is that a problem? After installing, i had around 270 updates to install, according to the update manager. I was having trouble launching a game with WINE, so I thought updating might help. After updating, I restarted my computer, and after a long while it showed me my desktop and the icon's on it, but I didn't get anything else. I didn't have the "taskbar" (not sure what it's called, sue me) on the left side, nor the bar at the top. I also received an error message saying some program had stopped working. I decided to restart my computer again, and that was when it told me that i have to re-configure my drivers, or run in "Low Graphics" mode for one session, amongst other options. Well, I decided to try to revert to the "basic video drivers", which was an option it gave. Restarting the computer gave me the same problem as in the second paragraph. After a few more restarts and a night of restless sleep, here I am trying to start my computer again, only to receive a black screen, and my monitor "going to sleep". I'm sort of stumped here, being new to Ubuntu (desktop, at least) and I really hope this gets fixed without me having to install Ubuntu on yet another partition (I have three other partitions for various things already) tl;dr: Black screen on boot after installing updates.

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• TechEd 2012: Fast SQL Server

  - by Tim Murphy

  While I spend a certain amount of my time creating databases (coding around SQL Server and setup a server when I have to) it isn’t my bread and butter.  Since I have run into a number of time that SQL Server needed to be tuned I figured I would step out of my comfort zone and see what I can learn. Brent Ozar packed a mountain of information into his session on making SQL Server faster.  I’m not sure how he found time to hit all of his points since he was allowing the audience abuse him on Twitter instead of asking questions, but he managed it.  I also questioned his sanity since he appeared to be using a fruit laptop. He had my attention though when he stated that he had given up on telling people to not use “select *”. He posited that it could be fixed with hardware by caching the data in memory.  He continued by cautioning that having too many indexes could defeat this approach.  His logic was sound if not always practical, but it was a good place to start when determining the trade-offs you need to balance.  He was moving pretty fast, but I believe he was prescribing this solution predominately for OLTP database prior to moving on to data warehouse solutions. Much of the advice he gave for data warehouses is contained in the Microsoft Fast Track guidance so I won’t rehash it here.  To summarize the solution seems to be the proper balance memory, disk access speed and the speed of the pipes that get the data from storage to the CPU.  It appears to be sound guidance and the session gave enough information that going forward we should be able to find the details needed easily.  Just what the doctor ordered. del.icio.us Tags: SQL Server,TechEd,TechEd 2012,Database,Performance Tuning

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• How to identify web development benchmarking questions? [closed]

  - by GenericJam

  I am in my final year of college and I have to put forward some sort of thesis for my final year project. The project is a web based attendance system that I am building for the college. I have it about 70% complete in Java. After completing it in Java, the plan is for me to rewrite the server bit in Erlang and then release the bitter rivals in a head to head cage match. The idea being that there is some sort of grounds for comparison. There are a few hurdles along the way, such as me learning Erlang. I understand that a performance comparison like this isn't strictly scientific as there are many factors such as the programmer (myself); the hardware it runs on; etc... but it is meant to be a reasonable comparison of the merits of using Java vs. Erlang for web development. I need help in identifying what the relevant questions are that my project could address. Even though the project scope is fixed, I am trying to shoehorn in some worthwhile scientific inquiries.

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• Why is my disk full?

  - by Agmenor

  I installed Ubuntu 12.04 by doing a fresh install where there was previously Ubuntu 11.10. My computer warns me now that my disk is nearly full. After having run apt-get purge, run apt-get autoremove and emptied the Trash can, I still have this problem as shown by this screenshot of Gparted: The disk /dev/sda7 is indeed full. I ran the Disk Usage Analyzer (Baobab) and I am still not sure of what is happening: One of my hypothesis is that when installing Ubuntu 12.04, I didn't configure my disks well and the disk /dev/sda6 is not mounted well as /home. Is this the reason indeed? What should I do to verify this and then to get the things fixed? Here are a few additional details to answer the questions I received (thank you everybody): My home directory is not encrypted. The Backup utility (Déjà Dup) is not set for automatic backups. (I do it myself and manually.) After I mount /dev/sda6, the command df -h gives Filesystem Size Used Avail Use% Mounted on /dev/sda7 244G 221G 12G 96% / udev 3,9G 4,0K 3,9G 1% /dev tmpfs 1,6G 904K 1,6G 1% /run none 5,0M 0 5,0M 0% /run/lock none 3,9G 164K 3,9G 1% /run/shm /dev/sda6 653G 189G 433G 31% /media/8ec2fa69-039b-4c52-ab1b-034d785132a1 (sorry but formatting this into code does not work, for an unknown reason) Thanks to izx's post, I realized /dev/sda6 was not even mounted before. It contains all the documents I used to have when I was running Ubuntu 11.10.

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• How to ask developers to think about high resolution screens

  - by WhiteWind

  I just got a ASUS N56VZ laptop, and it`s all good, but the screen resolution 1920x1080px. I am not asking, how to scale ui elements. If someone is interested I have found some tricks: increase font size in system settings increase unity dock size in MyUnity or system settings in modern Ubuntu versions. tweak userChrome.js of FireFox to make buttons|panels|icons larger add DefaultZoomLevel extension to FireFox to make it zoom pages initially. But all of it is miserable, because there are some big bugs: window decoration elements are way too small to pick them with mouse. I can't scale window easily and I can't position my cursor fast on the close|maximize buttons. Tuning lines like in sound volume dialog are hardly clickable at all. Unity top panel (status panel & tray) hardly can contain the bigger font, so it looks ugly, but icons are still the same. Sometimes I can`t read text, as it is cropped (and I cant scale some dialogs as it has fixed size) Chromium is not usable at all (ok, it's not Ubuntu problem, but the problem still exists) JAVA applications are not scalable (same as above) In FF I am able to get descent results in most cases, but multiplication of system font increase and browser font increase makes system controls (combobox, lists, drop down lists) extremely big, so I cant even control the zoom level on the page. IMHO, we should post a bug report (but what kind of bug?) and vote for it! The problem is even deeper, but at least we should ask developers to think about it. So my question is: how can I post a report (the right words and right place) and how can we (who already has that problem, or who want it to be solved before hardware upgrade) vote for faster solution. Any ideas?

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• How do I fix my ethernet card losing network connection every few minutes with kernels 3.8.x?

  - by igoryonya

  I'm using Ubuntu 13.04. My laptop is Acer Aspire one 722-c58rr, and my ethernet card works for a few seconds at a time with kernels 3.8.x, however, kernels 3.5.x and below worked fine. On kernels 3.8.x, it works fine after boot for about a minute, then it looses network connection. When pinging to some address, it says: network address is unreachable, but it can ping it's own address. The address is statically configured. Everything was working fine before. I went to vacation, where I used WiFi and 3G connections, so I didn't notice that the problem occurred. Came back home, plugged in into the ethernet. It worked for a minute then stopped. Rebooting commutator fixed the problem. Tried to connect to a different commutator, same problem. Unplugging and plugging the cable fixes the problem for another minute. Disconnecting eth in Network manager and reconnecting it again, does the same thing. WiFi has no such problem. Tried to use a different cable that works fine on another computer, the same problem. Tried to boot with the lower kernel version, the same problem was happening until I got to the version 3.5 of the kernel series. Everything works fine on the kernel 3.5.x, but I don't want to miss out on the new kernel's features. Executing commands, when booted with 3.8 kernel series, give the following results: lspci| grep -i eth: 06:00.0 Ethernet controller: Qualcomm Atheros AR8152 v2.0 Fast Ethernet (rev c1) dmesg| grep eth1: [ 89.548291] atl1c 0000:06:00.0: atl1c: eth1 NIC Link is Up How do I fix it, while staying in the new kernel version?

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• Ubuntu 12.04 menu bar, nautilus, terminal, and gtk themes not working after installation of Gimp 2.8

  - by Chris

  I installed gimp2.8 from this ppa: ppa:otto-kesselgulasch/gimp after that, my system began having problems. This is my thought process in trying to fix what's happened and the order in which it happened: I noticed the menu bar at the top changed from an opaque black to perfectly clear and the titles of applications and the hidden buttons reacted slowly. No big deal, restarted to see if it fixed it. It didn't, in fact, when the logon screen came up, the password field was grey and boxy like a default windows 98 theme (that's the best I can describe it) as were all the option buttons for gtk programs. I open terminal to try and reinstall gtk, but the terminal is just a black screen with no ability to input commands. I go to a tty and I reinstalled gtk3 and gtk2 (I have both on my system. I don't think they're in conflict, they hadn't been before hand). I restarted. Nothing doing. Log in, nautilus isn't placing icons on my desktop. I click the launcher. It flashes, but no window opens. Try to open by Alt+f2, nothing. I purge ubuntu-desktop, restart, reinstall ubuntu-desktop. Nothing. I have no clue what to do at this point so I'm asking for any help diagnosing the problem and fixing it.

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• How can I have sound output before logging in?

  - by ??O?????

  I have a machine (Ubuntu 11.10) that I would like to have it play audio (typically through an amplifier), but the machine should be headless (where its final placement will be). I will control what is played through ssh. However, there is no sound output until I login to the graphical console. At first I thought it was an issue with pulseaudio, so I promptly removed it to use the default ALSA, but I have the same issues. I ssh to the machine, I run alsamixer and get the typical cannot open mixer: No such file or directory error (while /proc/asound/cards display correctly what I have). If I login on the graphical console, alsamixer works fine in the ssh session, and I have sound output. I logout, and then alsamixer stops working. So something runs (Xsession perhaps?) when I login that enables sound output, and gets disabled when I logout. I remember in older versions of Ubuntu, there was a drum roll when the machine showed the login screen; that is not the case anymore. Perhaps if I somehow can enable that drum roll, I'll have fixed my problem too. In any case, the question I ask is what the title says.

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• Why is a software development life-cycle so inefficient?

  - by user87166

  Currently the software development lifecycle followed in the IT company I work at is: The "Business" works with a solution manager to build a Business Requirement document The solution manager works with the Program manager to build a Functional Spec The PM works with the engineering lead to develop a release plan and with the engineering team to develop technical specifications If there are any clarifications required, developers contact the PM who contacts the solution manager who contacts the business and all the way back introducing a latency of nearly 24 hours and massive email chains for any clarifications By the time the tech spec is made, nearly 1 month has passed in back and forth Now, 2 weeks go to development while the test writes test cases Code is dropped formally to test, test starts raising bugs. Even if there is 1 root cause for 10 different issues, and its an easily fixed one, developers are not allowed to give fresh code to test for the next 1 week. After 2-3 such drops to test the code is given to the ops team as a "golden drop" ( 2 months passed from the beginning) Ops team will now deploy the code in a staging environment. If it runs stable for a week, it will be promoted to UAT and after 2 weeks of that it will be promoted to prod. If there are any bugs found here, well, applying for a visa requires less paperwork This entire process is followed even if a single SSRS report is to be released. How do other companies process such requirements? I'm wondering why, the business cannot just drop the requirements to developers, developers build and deploy to UAT themselves, expose it to the business who raise functional bugs and after fixing those promote to prod. (even for more complex stuff)

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• How do I interpolate air drag with a variable time step?

  - by Valentin Krummenacher

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

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• How do I decide what type of programmer I want to be?

  - by Pearsonartphoto

  I've been working at my current work for some time, and I'm considering a bit of a change of careers. I'm trying to decide what it is exactly that I want to do, and I'm really just not sure. I'm not wanting a solution for my particular case, but what I'd like to know are some generalities of things I can look for. Here are some positions that I'm considering, and what my definitions are (I'm probably calling them something other than what is standard, but hopefully this will do for now). I'm looking for quizzes, articles, explanations, or anything that can help me figure this out. Manager - Managing programmers in some sense, mostly in making sure they are kept working. Coder - A person who is told to make a program do XYZ, and makes it do that. Doesn't have to model anything, or come up with formulas. Algorithm Designer - A person who comes up with a way to make software do something, but doesn't necessarily code that program, at least, not in it's final form. QA - A person who tests code for bugs, preferably with the code in hand. Architect - This person figures out how all of the pieces fit together, is a technical manager of sorts. Maintainer - This person takes someone else's existing code, and makes sure it is fixed when issues arise. Also of some note is figuring out what industry I want to work in. Feel free to add any of your own categories.

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• Rebuilding a Mac Mini (early 2009) --- Update

  - by Kelly Jones

  A couple of months ago I rebuilt the family’s Mac Mini (you can read the details in this post).  Things had gone pretty smoothly until a few weeks ago.  That’s when my wife mentioned that different applications would spontaneously crash. She kept track for a few days, and it turned out to be any or all of the applications that she uses (Safari, Quicken, Entourage, etc.) . I did some online research and didn’t really find too much – but then how do you do a proper Google search for “Mac OS 10.5.8 applications crash”.  The best suggestion seemed to be issues around 10.5.8, where people suggested that you go back to a previous version (something like 10.5.6).  The only way to do that is to completely reinstall the OS – which is what I had just done. SO, instead of doing that, I decided to just reapply the 10.5.8 update by downloading it from Apple (http://support.apple.com/downloads/Mac_OS_X_10_5_8_Combo_Update ).  I had installed the updates after the rebuild through the Apple Update mechanism built into OS X.  I thought maybe the combo update would reinstall some corrupted file (or something). I did this about a week ago and sure enough, we’ve had one crash this week with the same usage patterns as before.  I still have no idea what was causing the crashes, but at this point, I’m just going to declare it fixed and move on.

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• How to debug a fatal system crash - [graphical loop DOTA2]?

  - by Huw

  Whilst playing DOTA2, I occasionally and apparently randomly seem to be experiencing a fatal crash where the display freezes fixed and the audio loops over approx the last .5 of a second. Now, I'm interested in resolving this - but my trouble is I don't know where to start. The error appears non-reproducible (I've tried returning to games and deploying the same combination of events in hopes of pinning to to a certain shader etc), and I don't know which part of 'the stack' it might be coming from. Variables that occur to me: I custom build this system, did I do something wrong - is my PSU not providing enough power to the graphics card? I am running Steam and DOTA under Linux, could this new software have a bug Might it be something to do with my ATI Catalyst graphics drivers Is some other background process interfering I'm usually mid game when this occurs, so i quickly kill the power and reboot (when i'm lucky i can get back in with only 1-2 mins lost!). So my question here relates to logs. Where should I start to look or how might I set up logs to help me pin down a fatal crash of this kind by recording moments up to / before a crash and is this likely to be something I should push Steam to do, or is there something at a system level? Then perhaps I can return with a more specific question and perhaps even a bug report :) Many thanks in advance.

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• What is the value of checking in failing unit tests?

  - by user20194

  While there are ways of keeping unit tests from being executed, what is the value of checking in failing unit tests? I will use a simple example: Case Sensitivity. The current code is case sensitive. A valid input into the method is "Cat" and it would return an enum of Animal.Cat. However, the desired functionality of the method should not be case sensitive. So if the method described was passed "cat" it could possibly return something like Animal.Null instead of Animal.Cat and the unit test would fail. Though a simple code change would make this work, a more complex issue may take weeks to fix, but identifying the bug with a unit test could be a less complex task. The application currently being analyzed has 4 years of code that "works". However, recent discussions regarding unit tests have found flaws in the code. Some just need explicit implementation documentation (ex. case sensitive or not), or code that does not execute the bug based on how it is currently called. But unit tests can be created executing specific scenarios that will cause the bug to be seen and are valid inputs. What is the value of checking in unit tests that exercise the bug until someone can get around to fixing the code? Should this unit test be flagged with ignore, priority, category etc, to determine whether a build was successful based on tests executed? Eventually the unit test should be created to execute the code once someone fixes it. On one hand it shows that identified bugs have not been fixed. On the other, there could be hundreds of failed unit tests showing up in the logs and weeding through the ones that should fail vs. failures due to a code check-in would be difficult to find.

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• No sound Ubuntu 12.04 through HDMI

  - by MikeMan

  Specs: Asus G73JH i7/720; ATI Mobility 5870 I have read through a lot of threads on getting HDMI sound to work and non of them have fixed my issue. Granted I am very new to Linux and know only the GUI aspect of what it does from finding similarities that Windows 7 has. I would like to become a Linux Power User and I figured this would be a good step to get started. I was able to successfully install my graphics driver and it shows in use. I connect the HDMI to my HD TV and I get no sound. I don't care about auto switch for sound, that would be great but not necessary. I just want my sound to work through the HDMI. What I have tried: Changed GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.audio=1" pact set-card-profile 0 output:hdmi-surround Failure: no such entity Sound Settings: Right-click Sound indicator ? Sound Settings ? Output Tab, and set Digital Output (S/PDIF) Built in Audio Speakers Built in Audio I only get 2 settings. If I right-click the area below those 2 in the "play sound through" box, I get no "show hidden devices". I am also doing all this with the HDMI connected to eliminate any possibility for error.

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• Unable to start Ubuntu 12.04. The system is running in low-graphics

  - by kaleidoscpicsoul

  I am a newbie to Ubuntu. I installed Ubuntu 12.04 using a USB Stick and it was running all fine for a few weeks and this error popped up. According to one of my friend, the best way was to re-install Ubuntu. Being from a non unix background i thought the same too and after the second install it happened again, but only this time was much quicker, in 3 days. I don't want to re-install Ubuntu every time this happens. I am a complete newbie to Linux which means that i am really bad at using terminal. I know there are other people who fixed this issue using this very same forum, but unfortunately the answers provided are too complex for me to understand. Please let me know how to do this. Things I want to let you know: I would need help step by step if that is alright with you. After i get the error i get the options and i click exit to console login I get the following message in a black screen (which i think is a command line sort of thing): * Stopping save kernel messages [OK] apache2: Could not reliably determine the server's fully qualified domain name,using 127.0.1.1 for ServerName [OK] * Starting web server apache2 and a blinking cursor. So basically it looks like a dead end for my non unixy eye. And one final thing is before this issue had happened i had tried configuring Python to Apache2. For that i had uninstalled and installed LAMP server several time and edited the configuration files too. I don't know if this really is a concern, but I don't know.. I have a USB with Ubuntu 12.04 in it so i can install it anytime. (But i want to know what the issue is rather than running away) . I migrated to Ubuntu from Windows and i have no plans to go back. I think that's from my side. Please let me know if there are any questions.

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• How do I get dynamic subdomains on domain aliases in Plesk? [closed]

  - by mitchdesign

  I am running a site that is available via many domains. So all domains depend on the same code, but depending on the requested domain, the correct information is shown to the user. In Plesk, I have one domain set up and it has domain aliases for all the others. This works ok. Now, I'd like to be able to use subdomains on those aliased domains. Like the domains, the subdomains will be used as input for the system to display the correct information. So, they are not a fixed set. What I have done: - In DNS I have added *.example.com CNAME example.com to the main domain. This is automatically copied by Plesk to all the aliases. So DNS-wise, I think it's ok. - I have added a vhost.conf file to the main domain, containing ServerAlias *.maindomain.tld. This works for the main domain. But still, not for the aliased domains. And there is no place to put vhost.conf files for the aliased domains.. How do I tell the server to respond to those domain's subdomains as well?

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• Tool to know what is making the desktop load longer than usual

  - by Marky

  Is there such a tool? My desktop as of late is taking longer to load than usual. I'd say it takes more than 20 seconds from GDM login until I see the desktop. Aside from disabling all app-indicators and testing it manually one by one, what else should be done? The only indicator I remember activating lately was bluetooth and I have already disabled it from Startup Applications. No improvement. I know of bootchart, but I don't really have a problem with boot. It is only after I login that the issue occurs. I'm on Natty Narwhal. *Updating this thread.... The issue seems to have fixed itself and I did not even do anything. It is really weird. I guess this is how Gnome works (and talk about not recognizing your theme and reverting to Windows 95-like look. How about that?). I have been a long time KDE user and I never encountered issues like this one. The KDE then may have booted into the desktop longer (from KDM) but at least I know it was consistent.

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• Developing an Interface to a Dynamic System

  - by radix07

  I work for a small company and have been designing a GUI to interface our embedded system. The problem with this embedded system is that it is not a finished product (may never be) and is constantly under development and being tweaked and updated for different customers and applications in small volumes. So to deal with this I made a program that can export all the data from a spreadsheet where most of the embedded system variables are sourced from and throw them into a small database for the GUI application to use. This database program I made also spits out a cross reference file for the embedded system which allows the GUI to look up all the variables. This system works pretty well so far, and is even integrated with version control among the GUI, database, and embedded system. The big problem is that there is constant development on several projects that use this system and it gets terribly tedious to keep the system up to date and bring in new changes. This has gotten to the point to where I have had to code the GUI to dynamically (generically) generate all interfaces since I am never guaranteed to find the same data the same way. I have not been able to come up with a good way to uniquely identify the data I import from excel since all fields are able to be changed (due to engineering stubbornness, code re-factoring and/or excel issues) and I cannot assign a fixed reference within the sheet itself. So, are there any good methods or ideas on how to handle the chaos?

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• Testing my model for hybrid scheduling in Embedded Systems

  - by markusian

  I am working on a project for school, where I have to analyze the performances of a few fixed-priority servers algorithms (polling server, deferrable server, priority exchange) using a simulator in the case of hybrid scheduling, where we have both hard periodic tasks and soft aperiodic tasks. In my model I consider that: the hard tasks have a period equal to their deadline, with a known worst case execution time (wcet). The actual execution time could be smaller than the wcet. the soft tasks have a known wcet and random interarrival times. The actual execution time could be smaller than the wcet. In order to test those algorithms I need realistic case studies. For this reason I'm digging in the scientific literature but I am facing different problems: Sometimes I find a list of hard tasks with wcet, but it is not specified how the soft tasks parameters are found. Given the wcet of a task, how can I model its actual execution time? This means, what random distribution should I use considering the wcet? How can I model the random interarrival times of soft aperiodic tasks?

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• OpenGL : sluggish performance in extracting texture from GPU

  - by Cyan

  I'm currently working on an algorithm which creates a texture within a render buffer. The operations are pretty complex, but for the GPU this is a simple task, done very quickly. The problem is that, after creating the texture, i would like to save it. This requires to extract it from GPU memory. For this operation, i'm using glGetTexImage(). It works, but the performance is sluggish. No, i mean even slower than that. For example, an 8MB texture (uncompressed) requires 3 seconds (yes, seconds) to be extracted. That's mind puzzling. I'm almost wondering if my graphic card is connected by a serial link... Well, anyway, i've looked around, and found some people complaining about the same, but no working solution so far. The most promising advise was to "extract data in the native format of the GPU". Which i've tried and tried, but failed so far. Edit : by moving the call to glGetTexImage() in a different place, the speed has been a bit improved for the most dramatic samples : looking again at the 8MB texture, it knows requires 500ms, instead of 3sec. It's better, but still much too slow. Smaller texture sizes were not affected by the change (typical timing remained into the 60-80ms range). Using glFinish() didn't help either. Note that, if i call glFinish() (without glGetTexImage), i'm getting a fixed 16ms result, whatever the texture size or complexity. It really looks like the timing for a frame at 60fps. The timing is measured for the full rendering + saving sequence. The call to glGetTexImage() alone does not really matter. That being said, it is this call which changes the performance. And yes, of course, as stated at the beginning, the texture is "created into the GPU", hence the need to save it.

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• Book / software to learn ERP?

  - by user22311

  For a while I've been wanting to learn ERP. What I would like to do is set up a system, and then practice running a business doing things like generating invoices, raising purchase orders, producing monthly accounts, keeping track of fixed assets etc. Then look at enhancing the system further by adding custom code. I know there are a variety of open source ERP systems around, but really I would prefer a widely used commercial system as having familiarity with such a system would be more marketable. So are there any such systems that have a free developer version available? I've looked around, but I've had trouble finding such a system. Also I would like to find a good book or more likely books to read on ERP. Ideally I would be able to get an indepth explanation ERP from a business perspective, ie the accounting operations it supports, how to do all the regular accounting tasks, configuration, business operations best practices, accounting controls and so on. In addition I would like an IT perspective, ie setting up the system, developing forms and reports. Unfortunately the few books I've looked at have been really superficial and totally inadequate. They either fall into the beginning programmer camp, where they use the programming tools but concentrate on programming 101 topics like loops, flow control etc. Or they cover setting up the system with lots of screen shots, but little substance as to why things should be done a certain way. I have a programming background but no real experience in implementing ERP systems. Also I have a reasonable accounting knowledge, and have used ERP systems in various jobs, but only to a very limited degree. So are there any ERP experts who can point me in the right direction? Thanks.

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