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• Drawing lattices online

  - by lavabo

  This isn't really a programming question but... Is there any way to draw online a lattice for a material, like a compound? i.e. a 3D gridlike pattern? I know there are some applications for drawing mathematical lattices, but the notation to me is unfamiliar - are there simply programs or applets or something for drawing lattices like in a compound?

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• Keyboard and monitor recommendations

  - by Dmn

  I'm about to get a 23" monitor to connect to my laptop for programming, and general multimedia besides. This is the monitor; what do you think? Also, would you recommend getting a keyboard to use instead of the laptop's one? It seems like it would be awkward otherwise. This is the keyboard I'm looking at because it seems to have the low laptop style keys. Would you recommend something different?

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• Wear and tear on server hard drive from filesystem polling by PHP script

  - by jackie

  So I'm working on a discussion platform, and various clients will visit http://host/thread.php, which will render the discussion thread to date in addition to a form to submit a new post. When a new post is submitted, I would like all of the other clients with browser windows open to have it appear in near-real-time. One of the constraints of my script is that it may not use a DBMS and it must stay in the filesystem. Additionally, I can't use any PECL/PEAR extensions like inotify or anything like that for IPC. The flow will look like this: Client A requests thread.php and the thread is so far empty, but nonetheless it opens a Server-Side Event at eventPusher.php. Client B does the same. Client A fills out a post in the form and and submits (POSTs) it to subHandler.php. ??? (subHandler stores the new submission into the main thread storefile which gets read from when a fresh, new client requests thread.php, in addition to somehow signalling to the continually-running eventPusher event-source that a new comment was posted and that it should echo the event-json to the client. How, exactly, it will send this signal I'm yet unsure of, but there are a few options that I've thought of -- this is the crux of the question, so see below for more clarification) eventPusher.php happily pushes the new event to the client and it shows up soon after it was originally submitted on all clients who have the page open's screens. Now for the #4 missing-link mystery-step, I see a few problems. I mean, either way, eventPusher is gonna be doing a while loop of some sort -- it's gonna be polling something, I think that much is clear. (If that's a bad assumption please do let me know.) Now, the simplest way would be subHandler gets invoked on the form submission, writes it to the main store in addition to newComments.xml, then exits without doing anything else. Then eventPusher checks in newComments.xml every X seconds (by the way, what would be a reasonable time interval here?) and if it finds something then it emits an event to the client. Now, my fear with this is that the server's hard drive will have to constantly start spinning up. Maybe this isn't the case, perhaps it would just get cached in RAM and the linux kernel would take care of this transparently such that filesystem access doesn't actually engage the device because the kernel knows that that particular file hasn't changed since last read. * idea #2: I have no idea how to go about this, but perhaps there is a variable scope that gets stored in general RAM on the system which can be read by any process. Like if we mega-exported a bash variable so that $new_post is normally false but it gets toggled to true by subHandler, and then back to flase once it's pushed to the client. I doubt there's such a variable scope in PHP directly, but I struggle with the concept of variable scope, I just can't seem to understand it no matter what I read on it. * idea #3: eventPusher queries ps in its whileloop for another instance of itself. If there's not another eventPusher active then it's highly unlikely that new comments will be getting submitted. It's okay if this only works =90% of the time, it doesn't need to be completely foolproof. * idea #4: eventPusher queries DMESG to see if that file's been written to recently. So to sum everything up, I need to have inter-php-script-communication in near-real-time that will work on a standard mod_php shared hosting setup without any elevated privileges, PHP addon modules, or other system adjustments that can't be done from the PHP script itself at runtime. With*out* spinning up the drive more than a few times. No SQL servers either. Apologies if my english isn't the best, I'm still trying to improve on it.

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• Debian virtual memory reaching limit

  - by Gregor

  As a relative newbie to systems, I inherited a Debian server and I've noticed that virtual memory is very high (around 95%!). The server has been running slow for around 6 months, and I was wondering if any of you had any tips on things I could try, particularly on freeing up memory. The server hosts various websites and also a Postit email server. Here are the details: Operating system Debian Linux 5.0 Webmin version 1.580 Time on system Thu Apr 12 11:12:21 2012 Kernel and CPU Linux 2.6.18-6-amd64 on x86_64 Processor information Intel(R) Core(TM)2 Duo CPU E7400 @ 2.80GHz, 2 cores System uptime 229 days, 12 hours, 50 minutes Running processes 138 CPU load averages 0.10 (1 min) 0.28 (5 mins) 0.36 (15 mins) CPU usage 14% user, 1% kernel, 0% IO, 85% idle Real memory 2.94 GB total, 1.69 GB used Virtual memory 3.93 GB total, 3.84 GB used Local disk space 142.84 GB total, 116.13 GB used Free m output: free -m total used free shared buffers cached Mem: 3010 2517 492 0 107 996 -/+ buffers/cache: 1413 1596 Swap: 4024 3930 93 Top output: top - 11:59:57 up 229 days, 13:38, 1 user, load average: 0.26, 0.24, 0.26 Tasks: 136 total, 2 running, 134 sleeping, 0 stopped, 0 zombie Cpu(s): 3.8%us, 0.5%sy, 0.0%ni, 95.0%id, 0.7%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 3082544k total, 2773160k used, 309384k free, 111496k buffers Swap: 4120632k total, 4024712k used, 95920k free, 1036136k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 28796 www-data 16 0 304m 68m 6188 S 8 2.3 0:03.13 apache2 1 root 15 0 10304 592 564 S 0 0.0 0:00.76 init 2 root RT 0 0 0 0 S 0 0.0 0:04.06 migration/0 3 root 34 19 0 0 0 S 0 0.0 0:05.67 ksoftirqd/0 4 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/0 5 root RT 0 0 0 0 S 0 0.0 0:00.06 migration/1 6 root 34 19 0 0 0 S 0 0.0 0:01.26 ksoftirqd/1 7 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/1 8 root 10 -5 0 0 0 S 0 0.0 0:00.12 events/0 9 root 10 -5 0 0 0 S 0 0.0 0:00.00 events/1 10 root 10 -5 0 0 0 S 0 0.0 0:00.00 khelper 11 root 10 -5 0 0 0 S 0 0.0 0:00.02 kthread 16 root 10 -5 0 0 0 S 0 0.0 0:15.51 kblockd/0 17 root 10 -5 0 0 0 S 0 0.0 0:01.32 kblockd/1 18 root 15 -5 0 0 0 S 0 0.0 0:00.00 kacpid 127 root 10 -5 0 0 0 S 0 0.0 0:00.00 khubd 129 root 10 -5 0 0 0 S 0 0.0 0:00.00 kseriod 180 root 10 -5 0 0 0 S 0 0.0 70:09.05 kswapd0 181 root 17 -5 0 0 0 S 0 0.0 0:00.00 aio/0 182 root 17 -5 0 0 0 S 0 0.0 0:00.00 aio/1 780 root 16 -5 0 0 0 S 0 0.0 0:00.00 ata/0 782 root 16 -5 0 0 0 S 0 0.0 0:00.00 ata/1 783 root 16 -5 0 0 0 S 0 0.0 0:00.00 ata_aux 802 root 10 -5 0 0 0 S 0 0.0 0:00.00 scsi_eh_0 803 root 10 -5 0 0 0 S 0 0.0 0:00.00 scsi_eh_1 804 root 10 -5 0 0 0 S 0 0.0 0:00.00 scsi_eh_2 805 root 10 -5 0 0 0 S 0 0.0 0:00.00 scsi_eh_3 1013 root 10 -5 0 0 0 S 0 0.0 49:27.78 kjournald 1181 root 15 -4 16912 452 448 S 0 0.0 0:00.05 udevd 1544 root 14 -5 0 0 0 S 0 0.0 0:00.00 kpsmoused 1706 root 13 -5 0 0 0 S 0 0.0 0:00.00 kmirrord 1995 root 18 0 193m 3324 1688 S 0 0.1 8:52.77 rsyslogd 2031 root 15 0 48856 732 608 S 0 0.0 0:01.86 sshd 2071 root 25 0 17316 1072 1068 S 0 0.0 0:00.00 mysqld_safe 2108 mysql 15 0 320m 72m 4368 S 0 2.4 1923:25 mysqld 2109 root 18 0 3776 500 496 S 0 0.0 0:00.00 logger 2180 postgres 15 0 99504 3016 2880 S 0 0.1 1:24.15 postgres 2184 postgres 15 0 99504 3596 3420 S 0 0.1 0:02.08 postgres 2185 postgres 15 0 99504 696 628 S 0 0.0 0:00.65 postgres 2186 postgres 15 0 99640 892 648 S 0 0.0 0:01.18 postgres

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• Sending ASCII characters on Mac USB/RS232 cable

  - by Olivier

  Hello, I have a RS232C/USB cable to connect an electronic device to my iMac Intel (MacOSX SnowLeo 10.6.3). Is there a utility program that allows for sending ASCII characters on the USB port that the RS232C device will understand? If possible, I'd rather avoid programming. I'd prefer an Automator script or a simple program with a GUI. Thanks

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• Passing parameters to a shell script running as a cronjob

  - by Takashi

  I am new to bash scripting (not programming in general). I am writing a bash script that will run a Python script I have written. I want to be able to do the following: Pass parameters to the bash script via the cronjob (so I can have two cron jobs) one to be run with parameter 'foobar', and the other 'foo' switch based on the parameter passed to the bash script (by switching, I mean an if/else based on the paramter passed to the bash script).

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• Make Emacs status bar draggable anywhere?

  - by Ken

  In Emacs, if I split the frame (C-x 2), each window has a status bar. Historically, I could drag the status bar to resize them. Unfortunately, with Emacs these days and just a few modes (for version control, line/col number, abbrevs, my programming language, etc.), pretty much the entire bar has remapped mouse-1 to something other than letting me drag the bar! Is there any way to turn the status bar back into something I can drag, without losing all of my modes?

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• Upgrading PHP 5.1 to 5.3 on Linux Server

  - by nicorellius

  I trying to find the best way to upgrade from PHP 5.1 to 5.3. The CRM software I am running on this server requires this upgrade or else I probably wouldn't even perform it, because it seems like it's going to be perhaps trickier than I hoped it would be. Being still new to the programming world, these routine upgrades are still worrisome to me. I am running apache 2.2.6 (Fedora), PHP 5.1.6 and MySQL 5.0.27 on this server.

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• Setup VPN network for PS3

  - by L Franco

  Getting informed on setting up a home network so i can use VPN on my PS3, i live in Mexico but want the programming available in the US. Getting a little confused as every sites gives you different options, both in hardware and software. specially on subjects like dd-wrt, dns or vpn options... i know there is no "best" setup, but are there any tried and true?? Options in hardware and software would be apreciated...

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• About Eclipse's "Upgrade" menu in Team

  - by djechelon

  I wonder what that command means. I have a project shared on Subversion and this strange menu item appeared to me. I tried to click it, but Eclipse required me a confirmation to proceed because the operation cannot be undone. Eclipse version Eclipse IDE for Java Developers Version: Indigo Service Release 2 Build id: 20120216-1857 I didn't post on SO because my question is related to Eclipse itself and not to programming

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• How to set up a file server in a restricted corporate environment

  - by Emilio M Bumachar

  I work in a big corporation, and the disk space my team gets in the corporate file server is so low, I am considering turning my work PC into a file server. I ask this community for links to tutorials, software suggestions, and advice in general about how to set it up. My machine is an Intel Core2Duo E7500 @ 3GHz, 3 GB of RAM, Running Windows XP Service Pack 3. Upgrading, formatting or installing another OS is out of the question. But I do have Administrator priviledges on the PC, and I can install programs (at least for now). A lot of security software I don't even know about is and must remain installed. But I only need communication whithin the corporate network, which is not restricted. People have usernames (logins) on the corporate network, and I need to use them to restrict access. Simply put, I have a list of logins of team members, and only people in the list should access the files. I have about 150 GB of free disk space. I'm thinking of allocating 100 GB to the team's shared files. I plan monthly backups on machines of co-workers, same configuration. But automation of backups is a nice, unnecessary feature: it's totally acceptable for me to manually copy the contents to a different machine once a month. Uptime is important, as everyone would use these files in their daily work. I have experience as a python and C programmer, but no experience whatsoever as a sysadmin, and almost nothing of my programming experience is network programming. I'm a complete beginner in this. Thanks in advance for any help. EDIT I honestly appreciate all the warnings, I really do, but what I plan to make available is mostly stuff that now is solely on DVDs just for space reasons. It's 'daily work' to read them, but 'daily work write' files will remain on the corporate server. As for the importance of uptime, I think I overstated it: a few outages are OK, it's already an improvement over getting the DVDs. As for policy, my manager is kind of on my side, I will confirm that before making my move. As for getting more space through the proper channels, well, that was Plan A, and it's still on the table... But I don't have much hope. I'm not as "core businees" as I'd like.

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• Anyone know a good web-based file upload package?

  - by Ted Wexler

  Basically, what I'm looking for is a place for either one of our end users to be able to upload a file to this package, after either receiving a code from one of our support engineers or vice-versa(our engineers upload a file and send a code/link/something to end user) I've spent a bunch of time googling this, I found this: http://turin.nss.udel.edu/programming/dropbox2/, but the code there scares me, and it also doesn't render properly using PHP 5.3(uses short tags, who knows what else.) Does anyone have any recommendations?

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• How do you switch between Linux manual pages?

  - by Sheldon

  I'm new with Linux and have noticed that there are numbers beside certain commands I look up. For example I want to look up accept() in the aspect of network programming, but man accept shows this instead: accept(8) Easy Software Products accept(8) NAME accept/reject - accept/reject jobs sent to a destination So how do you switch between manual pages to other numbers like accept(1) ~ accept(7)?

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• Spellchecking po files

  - by moose

  Hi, I am translating some po-files and I would like to run a spell checker over them. I have Ubuntu 10.10 and use gtranslator. As far as I know, gtranslator can't spellcheck the whole file. I tried ispell: $ ispell lordsawar-0.2.0-pre4.de.po - this doesn't work, as English and German strings, as well as some programming-relevant comments appear in the .po-file. Do you know any program running on Ubuntu which can spell check po-files?

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• How can I listen to FM Radio streaming without connecting to the internet?

  - by Vicheanak

  Many phones has the functionality to listen to FM radio without connecting to the internet. Just wondering that how can I do this on a computer? Please give me some advices, thanks a lot. Sorry guy I understand this question is not programming related. For a computer I mean a notebook which already has the wireless and Bluetooth, and these two combination shall be able for a notebook to perform this functionality.

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• What tft-monitor to buy?

  - by Julian

  hi there, this is not really a programming question, but I can't figure out what tft-monitor to buy. The features I want to have are quite simple: FullHD (1920x1080) height-adjustable made for office use 24" (or better) not too expensive thanks for your answers!

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• Windows HPC Server 08 suitability for Matlabs

  - by blade

  I want to setup another Hyper-V VM for installing Matlabs/doing some compute-intensive programming using C. I keep thinking that Windows Server HPC 2008 is designed for this sort of work. Would I be on the right track to setup a single VM with this OS and install this software? Or is HPC more for grid/distributed computing? Thanks

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• How to keep track of time.

  - by The Digital Ninja

  This is just a general question. I started working from home a few months ago and i find the hardest part is trying to keep track of what I'm working on and how much time was spent. I do both programming and network admin work. Is there any software packages (free) out there that some of you use?

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• Is integrated graphics card Radeon HD 4200 capable to handle full HD?

  - by develroot

  I enjoy my integrated graphics card Radeon HD 4200 at resolution of 1280x1024 pixels on a 19" inches LG Flatron (5:4 aspect ratio) (playing FIFA 10 at max resolution, max quality). But recently i decided to upgrade my monitor and to get an 24" inches BENQ, 1920x1080, fullHD. Would I experience any problems with that graphics card on a such a big monitor? Usually I don't play games, just movies/music/and of programming, but it would be nice to be able to play some Counter Strike without artifacts.

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• How can I create a heat map based on data from Google Analytics?

  - by tnorthcutt

  How would one go about creating a heat map (say, of the US) based on location data from Google Analytics? I'd like to somehow create such a map with the visitor data from several websites that use Google Analytics. I'm not really looking for a step-by-step tutorial, just some suggestions on how to start. Assume little to no programming experience, but a willingness to learn and hack together stuff to make it work.

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• Scratch disks on solid state drives

  - by Kato

  For something like Final Cut Pro where you have scratch disks, is it absolutely a bad idea to use a solid state drive? There would be a lot of writing, but I'm thinking it would be less for video editing then say, programming? The read/write cycles for SSDs still seem pretty long...

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• windows xp command prompt remote

  - by user19810

  I was wondering if it was possible to have remote access to a command prompt on a windows xp machine, like using remote desktop services, only with the command prompt. I'm programming a java application, and having a full remote desktop service is a kind of a system hog. Also, the system I am using to access windows remotely is ubuntu. Thanks.

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• outlining in colors

  - by John

  ? I like outlining all information, but I am looking for better way to outline: I would like my outlines to be colorful like programming, so that it is very easy to distinguish between different types of texts within an outline. How can I do this?

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• Why do some websites have just http:// in URL address without www.?

  - by user318700

  This is not a programming question, but something I was curious for a long time. I am a web developer myself, but do not know the answer to this question. I notice some websites have just http:// in their address, with no www. (eg. http-colon-//delicious) and other websites have www. in their address (eg. http-colon-//www-dot-yahoo-dot-com)

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• What should be in the path variable?

  - by Paperflyer

  Recently, I had some programming problem. Some files could not be found. I checked the PATH variable and guess what? It was empty except for Quicktime. I guess Quicktime somehow managed to delete my path. Great. So. What should be in there? (Win7 x64)

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