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• memory and time intensive php task

  - by Goddard

  Sorry if this question has been asked before, but I couldn't find anything usable. I'm working on a project for a client and currently I have to loop through the users table which is about 3000 records and still growing. I have to do some calculations on a nightly basis which I am going to be using cron/php. The calculations script uses about 3.5mb of memory and takes about 1 second to run. When loading individual users my current php setup handles this fine, but if I try and loop through the user list my php script execution time runs out. I've read after doing some searching that I can make the page reload itself after each user calculation and just keep my previous place in the loop and this sounds like a good idea, but I wanted to hear some opinions from others that have handled similar situations and how you handled these types of tasks. Thanks.

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• Internet Connection Problems

  - by Confused One

  I just installed Ubuntu 11.04 onto a laptop. There is no list of automatic connections when I click on the internet connection symbol. Enable Wireless was unchecked, so I checked it. However, it continues saying "wireless is disabled." Soft is blocked, and when I tried rfkill unblock wifi it told me that the device was not ready. I tried to counter this with what I found on this thread but nothing worked. I have tried manually entering my Wireless information, but this does not help. Is there a solution?

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• PAE on Ubuntu 12.04

  - by JamesStewy

  I am having trouble using PAE on Ubuntu 12.04 LTS 32bit. I recently upgraded from 4 to 8gb of RAM but PAE doesn't appear to have picked this up. When I run "grep --color=always -i PAE /proc/cpuinfo" I get pae in the list. When I run "dmidecode | grep Size | grep MB" Installed Size is 3825 but the Maximum Total Memory Size: 8192 MB. When I check the BIOS it says there is 8192 MB available and the computer fully supports I have followed everything I can find on the internet (including this https://help.ubuntu.com/community/EnablingPAE) and nothing is working. My Computer is a Toshiba Portege m750. It has an Intel Centrino Core 2 Duo processor. Bought in 2009 Thanks, JamesStewy

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• Accidental deletion of the Gmail (IMAP) Trash 'System Label' in Evolution

  - by user20635

  I am using 11.04 and Evolution 2.32.2 I accidentally deleted the Gmail (IMAP) Trash 'System Label' in Evolution. Because this is Gmail object and (not a label per say), it is not deletable in Gmail. Under my Gmail account settings, I have made sure that both, 'Show in Label List' and 'Show in IMAP' are checked. That being said, I cannot seem to restore this IMAP folder in Evolution. I deleted the affected mail account, re-created, restarted Evolution, and no change. Any thoughts? Thanks.

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• Most supported/easiest to get started gamedev language?

  - by user1009013

  In what language are the most libraries/frameworks (like lwjgl for Java, XNA for C#)? What language is the easiest to start making a game (very easy to get a 3D-environment rendered)? What language has the friendliest learning curve? Say I want to make a game and I don't know any programming languages, I want to develop for any platform(so don't give the answer "the one you know best/the platform you are working on"), then what is the best language to start with. I get this question a lot "I have this and that ideas for a game and want to make it, what language should I use"(mostly asked by beginning programmers), but I don't know how to answer that. The answer "use the one you are most familiar with", because sometimes they don't even know a language yet... I am not asking for someone's personal opinion, but an objective list of what languages are the easiest/most supported/have the most/best libraries/frameworks to get started with gamedevelopment.

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• Ad networks that will serve via HTTPS?

  - by Dogweather

  I've built a website with 160K page views per month that serves every page over HTTPS. The recent FireSheep news will probably increase the adoption of "HTTPS everywhere" but it's been very hard to find ad networks and affiliates that will serve their content via HTTPS. I don't want to use these because I don't want my visitors to get "broken security" notification from their browsers (and of course, relevant ads would be a leak of private information). I'm tired of spending a ton of time signing up with ad networks and affiliates only to find out down the road that they don't support HTTPS (e.g. AdSense). Can anyone suggest any options or provide a pointer to a list of these somewhere?

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• Security Alert for CVE-2011-5035 Updated

  - by Eric P. Maurice

  Hi, this is Eric Maurice again.  Oracle has just updated the Security Alert for CVE-2011-5035 to announce the availability of additional fixes for products that were affected by this vulnerability through their use of the WebLogic Server and Oracle Container for J2EE components.  As explained in a previous blog entry, a number of programming language implementations and web servers were found vulnerable to hash table collision attacks.  This vulnerability is typically remotely exploitable without authentication, i.e., it may be exploited over a network without the need for a username and password.  If successfully exploited, malicious attackers can use this vulnerability to create denial of service conditions against the targeted system. A complete list of affected products and their versions, as well as instructions on how to obtain the fixes, are listed on the Security Alert Advisory.  Oracle highly recommends that customers apply these fixes as soon as possible.

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• Only one resolution available in Xorg.conf

  - by Kévin Guilbeault

  I recently upgraded to Ubuntu 12.10 and when I try to change my resolution in NVIDIA X server settings, I only get the native one (1600x900). When I had 12.04 installed, all resolutions were available in the drop down list. My goal is to have twinview working again. I used to set my two screens to twinview and clones, using my HDTV resolution (1360x768) which was previously available in 12.04 for my laptop screen too. In 12.10, I tried to install all of the NVIDIA drivers available except the nouveau driver. I tried to add a new mode using Xrandr --newmode / --addmode, but it didn't work; it coudn't detect my output. I'd like to know if this is a known bug and if there's something to do with that. Thanks!

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• Wireless problems on HP

  - by Sat93

  I'm not able to enable Wireless using the hardware switch on my HP ProBook4430s. Because of this the Enable Wireless option is greyd out and I cannot enable it. The greyd out option can be seen in the screenshot below. The results of iwconfig for my system are as follows, lo no wireless extensions. wlan0 IEEE 802.11bgn ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=off Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off eth0 no wireless extensions. Also I tried to do the following, sudo ifconfig wlan0 up but I got an error as below, SIOCSIFFLAGS: Operation not possible due to RF-kill Also the result of sudo rfkill list all for my system is as follows, 0: phy0: Wireless LAN Soft blocked: no Hard blocked: yes 1: hp-wifi: Wireless LAN Soft blocked: no Hard blocked: no 2: hp-bluetooth: Bluetooth Soft blocked: no Hard blocked: no 3: hci0: Bluetooth Soft blocked: no Hard blocked: no How do I fix this problem? Thanku!

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• Show Ubuntu logo in Byobu (tmux) status bar?

  - by RSoul

  For some reason my Byobu (tmux) status bar is showing TAB instead of the ubuntu logo. This: where it should be this: I've tried installing some different fonts, but have not corrected the issue yet. Any ideas? Further information: sudo apt-get install ttf-ubuntu-font-family Reading package lists... Done Building dependency tree Reading state information... Done ttf-ubuntu-font-family is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Update: fc-list on my computer shows all the fonts with the prefix /usr/share/fonts/ e.g., /usr/share/fonts/truetype/ubuntu-font-family/UbuntuMono-R.ttf: Ubuntu Mono:style=Regular But the same command on a working system shows fonts listed thus: Ubuntu Mono:style=Bold Italic Perhaps it's a font location problem?

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• Steam not displaying text on wine 1.5 running on Ubuntu 12.04

  - by Jscags

  Hello fellow dwellers of askubuntu, as the title says I'm having difficulties with getting Steam to run properly. I think I have the solution but I am pretty incompetent with Ubuntu (just started using it the other day) so a step by step process would be unbelievably appreciated! Here are the links to what I think possible solutions are: [1] https://bbs.archlinux.org/viewtopic.php?id=146223 [2] http://bugs.winehq.org/show_bug.cgi?id=31374 I've tried googling how to preform the solutions such as changing the alias/script for steam (no idea what that is) to -no-dwrite or launching with wine Steam.exe -no-dwrite. The dwrite seems to be the issue in all this but I can't for the life of me figure out how to do anything about it. Any useful input is what I'm hoping for but for the brave soul who feels like typing a bit more, perhaps a step-by-step list of instructions starting from downloading Steam off the official website, would be my saving grace. If there is any more info you guys need let me know and I'll of course be happy to oblige!

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• Why can't I get into my repositories?

  - by ken1943

  Upgraded from 10.04 to 10.10 by mistake and am having problems with some of my programs. They either don't work or they disappear from view on the screen. The Repositories menu item in Synaptic Packages Manager is a case in point. The computer does nothing when I choose this item. I am locked out of unless I edit /etc/apt/sources.list. The rest of the application seems to work, however. Update Manager just flashes on screen then disappears without doing, as does Printing. How do I downgrade from a higher to a lower level repository? I need to downgrade from 10.10 to 10.04. Each time Ubuntu upgrades to 10.10 evil things happen and the operating system really gets messed up. I really do not want to have to erase and install my operating system all over again if I can help it.

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• What is a *slightly* less extreme equivalent to being "fluent" in a language?

  - by Mehrdad

  tl;dr: What is a less extreme (but still noticeable) alternative to the word "fluent", when saying e.g. "I am fluent in C++/Python/whatever?" I think I can call myself "fluent" in C#, because I know the language and runtime very well, and I'm very familiar with the .NET framework's APIs and classes, etc. I would like to claim the same thing for Python and C++. But while I can program in Python (I did so for an entire summer, making a website with Django), for example, I would not call myself fluent because my code isn't always "Pythonic" (e.g. using map/filter vs. list comprehensions), and I'm not too intimate with some aspects of the language and standard library yet (e.g. the introspection API, etc.). Is there a word or phrase I can use on e.g. a resume to describe what I know? I can think of "very familiar with", but is there a better word/phrase I can use?

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• What does it mean for SVN "to pollute the local source tree"?

  - by asd

  I'm reading "Professional Team Foundation Server 2010" by Wrox, and in an advantages/disadvantages list, the said: "Like CVS, SVN makes use of .svn directories inside the source folders to store state of the local working copy, and to allow synchronization with the server. However, it can have the affect of polluting the local source tree, and can cause performance issues wiht very large projects or files." What does the bit about pollution mean? I've used SVN for C# & ASP.NET projects for a long time and haven't encountered any problems. What probably does this quote think I should have been watching out for?

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• How to manually detect deadlocks

  - by Dawson

  I understand the concepts of deadlock well enough, but when I'm given a problem like the one below I'm not sure how to go about solving it. I can draw a resource allocation graph, but I'm not sure how to solve it from there. Is there a better more formal way of solving this? Consider a system with five processes, P1 through P5, and five resources, R1 through R5. Resource ownership is as follows. • P1 holds R1 and wants R3 • P2 holds R2 and wants R1 • P3 holds R3 and wants R5 • P4 holds R5 and wants R2 • P5 holds R4 and wants R2 Is this system deadlocked? Justify your answer. If the system is deadlocked, list the involved processes.

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• How do you change brightness, color and sharpness from command line?

  - by YumYumYum

  I am controlling my PC with SSH and scripting. How can i change the brightness, color and sharpness from command line? Try 1: failed $ sudo redshift -t 5000:5000 -g .5 Cannot list GNOME panel applets. Initialization of gnome-clock failed. Trying next provider... Latitude and longitude must be set. Try 2: failed $ cat brightness 20 $ cat max_brightness 20 $ echo 1 | sudo tee /sys/class/backlight/acpi_video0/brightness 1 $ echo 20 | sudo tee /sys/class/backlight/acpi_video0/brightness Any alternative way to do? Follow up: http://jonls.dk/redshift/ [command] [1000K to 10000K] [effects 0.1 to 10.0] | | / / / ^ ^ ^ ^ ^ redshift -t 1000:1000 -l 0:0 -g .1; Dark redshift -t 1000:1000 -l 0.0 -g 5; Bright

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• Ubuntu won't load properly all of a sudden

  - by Peter Raeves

  This has been the second time this has happened, but when I booted this morning my hardware wasn't detected anymore. I see both screens pop up as normal, choose Ubuntu 14.04 in the grub list and from that point onwards none of the following hardware seems to be used: VGA, DVI-D, USB, Audio jacks. This has happened before, but at that time, I still had one screen left, so I could navigate through the (non-USB) keyboard and how weird this may sound, but from the moment I opened Windows in vmware, all of my hardware started working again. This was a few weeks ago, but the same seems to have happened again. This time I can't use that little hack though, since now Ubuntu stops using both screens. My hardware is all detected, Ubuntu just doesn't want to use it somehow. Did anybody else encounter this and how did they solve this?

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• C++ compiler structures such as Virtual method Table etc

  - by Roger

  I am aware of the C++ Virtual Table which allows dynamic dispatch for doing things at runtime (although if I am honest I am not completely sure of the full list of things it achieves). I am wondering what other "low level" aspects of C++ are there, which one doesnt usually come across when learning the C++ language? Things like: -How is multithreading and locking on objects performed? -Overloading/overwriting functions -Generics Are there other "structures", similar to the vtable, which assist with these types of things on a lower level? (and if anyone can help with what the VTable actually does it would be most appreciated!)

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• How to install g++ in Ubuntu 14.04?

  - by Apoorva sahay

  I have recently installed ubuntu 14.04 in virtual box. Now I want to install g++ 4.7 in it. I am trying this command in terminal but its not working. sudo apt-get install g++-4.7 Reading package list... Done Building dependency tree Reading state information... Done E: Unable to locate package g++-4.7 E: Couldn't find any package by regex 'g++-4.7' But I find gcc was there with Ubuntu 14.04 installation itself. How could I install g++ in ubuntu 14.04 and any version of g++ abouve 4.7.2 is fine with me.

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• What are the security implications of running untrusted code on my server?

  - by rahmu

  I would like to set up an app that allows users to send their code and execute it on my server. The thought of running untrusted code makes me cringe, so I am trying to set up an exhaustive list of security threats that should be addressed. I am assuming I should strip down certain features of the language executed, like file access or (maybe) networking. I also come across terms like sandboxing or chroot. I know what they mean, but how should I actually use them? In short: What security threats should I address before allowing users to run their code on my machine, and how do I do it?

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• What are some tablets that can run Ubuntu?

  - by tacozmeister

  I can't believe I'm actually asking this, but what are some good, cheap tablets that can run Ubuntu? I'm considering getting a tablet, but I don't really want an expensive one like an iPad. And I love Ubuntu. So what tablets are out there that are cheap, but can also run Ubuntu 12.04 without much lag if it's installed after purchase? Personal anecdotes would be appreciated! Note: I'm not asking you to help me shop, just to formulate a list of tablets (+personal preference) that can use Ubuntu.

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• What is a modern software engineer's resume supposed to look like? [on hold]

  - by willOEM

  My secondary education was primarily focused on the sciences (Molecular Biology and Bioinformatics), but now I work primarily as a software developer. I feel like my resume is totally inappropriate for my current career goals. Listing laboratory skills and accomplishments is not the same as listing software development skills and accomplishments. Oddly enough, I can't seem to find any resources for writing a engineer's resume online that aren't older than 5 years. GitHub and StackExchange profiles seem like as important resume items as anything, yet I don't know how to list them on a resume, or whether they are appropriate at all. So what is a modern software engineer's resume supposed to look like?

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• I want to fix a bug. Where do I start?

  - by Ingo Gerth

  Although I am not a professional programmer, I have written a program or two. Yet, nowadays every engineer and scientist learns to program a bit as well, and as such I am used to writing programs in Python, C and MATLAB. Now I want to give back a bit to Ubuntu and its great folks and fix a bug! I had a look at the list of the bitesize campaign and had to find that most of them are not that easy for me to fix as I suspect they require a lot of time to get into the matter, and I do not have that. Still I discovered this one and it looks manageable and like a cool feature to me. As I have never written a patch or released a program to the wild before though, I have no idea where to start. What should be my first step to tackle that problem? Bottom line: Where and how do I start fixing that guy?

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• svn-based versioning tool, problem with network timeout

  - by Scarlet

  My dev team was committed a versioning tool based on Subversion to run on Windows (our svn client is sliksvn). We're developing with Delphi XE2, should that matter. We're asked to implement a "check for updates availability" feature, which has to work as follows: Connect to the SVN repo via svn+ssh protocol; See if there are changes to receive and list them; Let the user decide if he wants to receive changes or not. We don't have a great knowledge on svn, so we thought to implement that thing client side by a certain number of CreateProcess calls that wrap directly proper svn commands. Anyways what we perceived is that if network problems should arise, such like a connection drop, svn client hangs forever waiting for the operation to close instead of failing for timeout. We know that CreateProcess can be given a timeout argument, but it wouldn't be correct to use it, as we can't know from outside how long will be the svn operation taking to complete. Is there any way to avoid that deadlock?

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• Lining things up while using columns

  - by Charles

  I have a request that may not be possible. I'd like to line up the elements of a form so that the inputs all start at the same place: Name: [ ] Company: [ ] Some question with a long name: [ ] But my list is (somewhat) long and I would like to show them in multiple columns on screens that are wide enough. Ideally, I'd find a POSH method (table-free is semantically appropriate, I think) that works on a reasonable number of browsers. My current page uses a table. I tried CSS with columns: auto; -moz-column-count: auto; -moz-column-width: auto; -webkit-column-count: auto; -webkit-column-width: auto; but Firefox (at least) won't break a table across columns.

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