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• Building a new cluster for mathematical calculations (Win/Lin)

  - by Muhammad Farhan

  I would like to build a new cluster to perform heavy mathematical calculations in Matlab and Abaqus. One of my friend told me that distributed computing is way faster than parallel computing, which is very true after reading a bit on the internet. However, I have never clustered before. Current workstation I own: Dell Precision T5400 2 x Intel Xeon 2.5 GHz 16 GB RAM (2GB x 8) 1 x Western Digital 1TB HDD 7200 rpm 1 x nVidia Quadro FX4600 768MB GPU 1 x 870W PSU OS: Windows 7 Ultimate 64-bit 2nd WS: I can buy another WS similar configuration to the one I own I am not bothered about OS, I am willing to cluster with either Windows or Linux. However, my software are compatible with windows 64-bit only. Please help me setup a cluster. Thank you.

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• conflict in debian packages

  - by Alaa Alomari

  I have Debian 4 server (i know it is very old) cat /etc/issue Debian GNU/Linux 4.0 \n \l I have the following in /etc/apt/sources.list deb http://debian.uchicago.edu/debian/ stable main deb http://ftp.debian.org/debian/ stable main deb-src http://ftp.debian.org/debian/ stable main deb http://security.debian.org/ stable/updates main apt-get upgrade Reading package lists... Done Building dependency tree... Done You might want to run 'apt-get -f install' to correct these. The following packages have unmet dependencies. libt1-5: Depends: libc6 (= 2.7) but 2.3.6.ds1-13etch10+b1 is installed locales: Depends: glibc-2.11-1 but it is not installable E: Unmet dependencies. Try using -f. Now it shows that i have Debian 6!! cat /etc/issue Debian GNU/Linux 6.0 \n \l EDIT I have tried apt-get update Get: 1 http://debian.uchicago.edu stable Release.gpg [1672B] Hit http://debian.uchicago.edu stable Release Ign http://debian.uchicago.edu stable/main Packages/DiffIndex Hit http://debian.uchicago.edu stable/main Packages Get: 2 http://security.debian.org stable/updates Release.gpg [836B] Hit http://security.debian.org stable/updates Release Get: 3 http://ftp.debian.org stable Release.gpg [1672B] Ign http://security.debian.org stable/updates/main Packages/DiffIndex Hit http://security.debian.org stable/updates/main Packages Hit http://ftp.debian.org stable Release Ign http://ftp.debian.org stable/main Packages/DiffIndex Ign http://ftp.debian.org stable/main Sources/DiffIndex Hit http://ftp.debian.org stable/main Packages Hit http://ftp.debian.org stable/main Sources Fetched 3B in 0s (3B/s) Reading package lists... Done apt-get dist-upgrade Reading package lists... Done Building dependency tree... Done You might want to run 'apt-get -f install' to correct these. The following packages have unmet dependencies. libt1-5: Depends: libc6 (= 2.7) but 2.3.6.ds1-13etch10+b1 is installed locales: Depends: glibc-2.11-1 E: Unmet dependencies. Try using -f. apt-get -f install Reading package lists... Done Building dependency tree... Done Correcting dependencies...Done The following extra packages will be installed: gcc-4.4-base libbsd-dev libbsd0 libc-bin libc-dev-bin libc6 Suggested packages: glibc-doc Recommended packages: libc6-i686 The following packages will be REMOVED libc6-dev libedit-dev libexpat1-dev libgcrypt11-dev libjpeg62-dev libmcal0-dev libmhash-dev libncurses5-dev libpam0g-dev libsablot0-dev libtool libttf-dev The following NEW packages will be installed gcc-4.4-base libbsd-dev libbsd0 libc-bin libc-dev-bin The following packages will be upgraded: libc6 1 upgraded, 5 newly installed, 12 to remove and 349 not upgraded. 7 not fully installed or removed. Need to get 0B/5050kB of archives. After unpacking 23.1MB disk space will be freed. Do you want to continue [Y/n]? y Preconfiguring packages ... dpkg: regarding .../libc-bin_2.11.3-2_i386.deb containing libc-bin: package uses Breaks; not supported in this dpkg dpkg: error processing /var/cache/apt/archives/libc-bin_2.11.3-2_i386.deb (--unpack): unsupported dependency problem - not installing libc-bin Errors were encountered while processing: /var/cache/apt/archives/libc-bin_2.11.3-2_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1) Now: it seems there is a conflict!! how can i fix it? and is it true that the server has became debian 6!!?? Thanks for your help

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• Why is my HDD not showing up?

  - by Mike

  I'm on Windows 7, got a new 2 TiB NON-external hard disk. When I plug it in it doesn't show up on the Disk Management list in the Computer Management window (that you get by right-clicking My Computer and selecting "Manage"). At first I thought it was broken, but I could see it using a friend's computer. I've run a full disk scan using the official tool from Western Digital, no problems. I've formatted it and partitioned it at another friends place, I've even encrypted the disk fully without any problems, then mounted it and placed a text file on it with the word "hello" inside and saved the file. When I boot my own computer the disk shows up in BIOS. So the disk is not broken. I've tried changing what SATA slot on the motherboard I stick it in. Makes no difference. After all this: Why won't my Windows 7 discover the disk???

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• Debian 5 server is randomly shutting down.

  - by revofreak

  My debian 5 vps is suffering from random shutdowns. I reinstalled it several times, the hosts moved me to a different physical box, check the install image and said everyone else also uses it and is fine. Heres the output from syslog Mar 27 00:19:19 noobintraining-1 -- MARK -- Mar 27 00:32:01 noobintraining-1 shutdown[18142]: shutting down for system halt Mar 27 00:32:06 noobintraining-1 init: Switching to runlevel: 0 Mar 27 00:32:06 noobintraining-1 xinetd[15907]: Exiting... Mar 27 00:32:07 noobintraining-1 named[15865]: received control channel command 'stop -p' Mar 27 00:32:07 noobintraining-1 named[15865]: shutting down: flushing changes Mar 27 00:32:07 noobintraining-1 named[15865]: stopping command channel on 127.0.0.1#953 Mar 27 00:32:07 noobintraining-1 named[15865]: stopping command channel on ::1#953 Mar 27 00:32:07 noobintraining-1 named[15865]: no longer listening on ::#53 Mar 27 00:32:07 noobintraining-1 named[15865]: no longer listening on 127.0.0.1#53 Mar 27 00:32:07 noobintraining-1 named[15865]: no longer listening on 89.238.172.132#53 Mar 27 00:32:07 noobintraining-1 named[15865]: exiting Mar 27 00:32:07 noobintraining-1 exiting on signal 15 Any help is most appreciated!

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• Video issues with old server running Boxee

  - by Skaughty

  I have a old Dell Power Edge 1650 1U rackmount server running Windows XP. Dual 1.3 ghz Processors and 1 GB of RAM. I would like to run Boxee on it, but the 8mb integrated video card will not support it. The font within Boxee just comes up as blocks of color. I have a PCI Radion R9000 dual out video card. However when I plug it in I can not get video signal on any of the VGA outs. Is it possible to upgrade the video card on this old of a server, or is it possible to make it work with the older integrated video?

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• Good scanner to buy as of January 2010

  - by AlexV

  I'm planning to buy a scanner soon and since I didn't purchased one in years I wanted to know which brand / models are the "best". The ability to scan negatives is a nice to have but not 100% required. If you are specifing a model in particular, plase note that it must work under 64-bit OS (I'm using Windows 7 Ulitmate 64-bit). I'm not looking for a all-in-one solution like scanner/fax/printer. I want to use this to scan "old" photos from the non-digital era :) And sometimes to scan magazines and books. I am located in Canada it would be nice if your suggestion is available here. I usually buy online at NCIX and DirectCanada if it can help you see what's available there. Edit: My search leaded me to 2 particular models. I hesitate between Canon CanoScan 8800F and Epson V600. Anyone have good/bad words on either of them?

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• Multicasting and multicast address

  - by Zia ur Rahman

  I have confusion about the multicast addresses, I have read an example which is given by. Suppose two applications have been built to send audio over a network. One application accepts and digitizes an audio input stream, and then sends the resulting frame across the network to other application. The second application receives the digitized audio from the network, converts it back to the audio signal and plays the result over a speaker. Unless the two applications use broadcast to send frames, no other computers on the network will receive a copy of the frame. Multicasting provides an excellent solution to the problems of allowing some computers to participate in audio transmission. To use multicasting , a multicast address must be chosen for the audio application. And the receiving application passes the multicast address to the network interface. The interface begins to accept the packets sent to that address. Question: how this multicast address is chosen, how the receiving application knows that the sender using this specific destination address for the audio frames.

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• How to fix White Screen of Death after updating iTunes?

  - by cust0s

  The other night I updated my iTunes to the latest version (through Software Update) when I came to turn on my computer I was greeted with the dreaded white screen of death. I use an early 2008 iMac 24". I've tried the basic things, unplugging/turning off accessories, trying to boot from the install disk, reseting pram, etc, etc. Still no luck and no change what-so-ever. All I've been able to ascertain that my keyboard still works (by ejecting). I should point out that I did recently replace my Hard drive with a Western Digital Black 500GB (though the computer is well out of warrenty) and I'm a little concerned that the problem could be the screen.

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• Wake on Lan/Wan won't work after some time has passsed

  - by Vian Esterhuizen

  I have the following set up: Gigabyte Z77X-UD5H Wake On Lan Enabled Asus N66U Port Forwarding Static IP assigned to my computer Windows 7 Advanced Power Management - PCI Express - Off Intel 82579V - All options under Power Management checked I'm trying to set this up for Wake on Wan capabilities. If I shut down my computer and immediately try to Wake on Wan (and Lan) it works and starts up. While the computer is on, I've used a few WOL specific packet sniffers and the packet comes through on the correct port. After any period of time over a few minutes, waking on Wan or Lan won't work. The back "activity" light is blinking on my ethernet port on my computer, as well as on the router, so I would assume the network card is on and able to receive a signal. Any ideas? Suggestions? What can I do to troubleshoot the problem?

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• DokuWiki Segmentation Fault On Radius Auth

  - by mrduclaw

  I'm running x64 Ubuntu 12.04. I did a simple apt-get install dokuwiki to install DokuWiki. And I'm trying to follow the directions located here: http://www.dokuwiki.org/auth:radius to get Radius authentication working. Things seemed to install OK. Under Configuration Manager I selected Authentication backend to be "Radius" and filled in the Radius details at the bottom. Now, however, whenever I try to log into the Wiki, my browser gives me the following error: No data received I checked /var/log/apache2/error.log and see this: [Tue Jul 10 22:22:14 2012] [notice] child pid 5270 exit signal Segmentation fault (11) I'm fairly sure the Radius server is setup correctly as it correctly authenticates with my squid proxy and other stuff on the network. But this is about the extent of my Linux troubleshooting skills. Can anyone suggest steps for me to follow to help track down what's causing apache2 to segfault short of attaching with gdb and issuing a set follow-fork-mode? I'm also open to just hearing suggestions for simila

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• Best software to edit your photos (red-eye correction etc.)

  - by FractalizeR

  Hello. My mother wants me to correct her photos (red eye, some other defects). But, actually, I don't know what tool I can use on Windows for digital photo editing. Preferably, free of course. I was going to try F-Spot for that, but found, that it's available only on Linux. Can you suggest something cool for photo editing? I need to edit, NOT organize. GIMP is too complex, Paint .NET seem not to be capable of extended correction functions.

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• Rainmeter customization issues, pretty basic

  - by user62865

  I'll admit it; I'm new to using Rainmeter. What I want to do is create two panels (one left, the other on the right) that mirror one another. One side I want to work for the Eastern US while the other for the UK. I want to keep digital clocks, the same style etc., on both sides with their respective time zone. On top of this I want to have weather reports for the whole day (Current weather and temp, morning, afternoon, and night) for each location. However, I have not been able to find any skins which allow this. For whatever reason every time I try to load a skin for a clock I can only load it for one clock of that type and I'm having the same issue with the weather skins. Could anyone please tell me what skins I should look at and how to get a mirrored look?

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• Good Documentation on Avaya IP Office 500 r2 setup

  - by Cliff Racer

  I have set up a couple of Avaya IP Office systems over the course of my current job. I have a pretty good handle on the process, but now I am faced with something I have not done before. Both the IP office systems I have set up used all Digital phones. The new system we are putting in place will actually use IP phones for the first time. After tyring to track down some general documentation on my own, I was not able to find anything that left me feeling comfortable about setting up IP phones on an Avaya IP Office 500. Does anyone know of any good how-To's for setting up IP phones on IP Office? I get the impression its pretty simple but learend enough about Avaya to know that there are some tricky aspects to setting them up

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• Postfix TLS issue

  - by HTF

  I'm trying to enable TLS on Postfix but the daemon is crashing: Sep 16 16:00:38 core postfix/master[1689]: warning: process /usr/libexec/postfix/smtpd pid 1694 killed by signal 11 Sep 16 16:00:38 core postfix/master[1689]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling CentOS 6.3 x86_64 # postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases broken_sasl_auth_clients = yes command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix debug_peer_level = 2 disable_vrfy_command = yes home_mailbox = Maildir/ html_directory = no inet_interfaces = all inet_protocols = all local_recipient_maps = mail_owner = postfix mailbox_command = mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man mydestination = $myhostname, localhost.$mydomain, localhost mydomain = domain.com myhostname = mail.domain.com mynetworks = 127.0.0.0/8 myorigin = $mydomain newaliases_path = /usr/bin/newaliases.postfix queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES relay_domains = sample_directory = /usr/share/doc/postfix-2.6.6/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtp_tls_note_starttls_offer = yes smtp_tls_session_cache_database = btree:/var/lib/postfix/smtpd_tls_cache.db smtp_use_tls = yes smtpd_delay_reject = yes smtpd_error_sleep_time = 1s smtpd_hard_error_limit = 20 smtpd_helo_required = yes smtpd_helo_restrictions = permit_mynetworks, reject_non_fqdn_hostname, reject_invalid_hostname, permit smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_pipelining, reject_non_fqdn_recipient, reject_unknown_recipient_domain, reject_invalid_hostname, reject_non_fqdn_hostname, reject_non_fqdn_sender, reject_unknown_sender_domain, reject_unauth_destination reject_rbl_client cbl.abuseat.org, reject_rbl_client bl.spamcop.net, permit smtpd_sasl_auth_enable = yes smtpd_sasl_local_domain = $myhostname smtpd_sasl_path = private/auth smtpd_sasl_security_options = noanonymous smtpd_sasl_type = dovecot smtpd_sender_restrictions = permit_mynetworks, reject_non_fqdn_sender, reject_unknown_sender_domain, permit smtpd_soft_error_limit = 10 smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_session_cache_timeout = 3600s smtpd_use_tls = yes tls_random_source = dev:/dev/urandom unknown_local_recipient_reject_code = 550

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• Redirect output of Python program to /dev/null

  - by STM

  I have a Python executable, written and compiled by somebody else, that I simply need to run once halfway down my own bash script. The program uses a text-based UI, therefore waits for input before proceeding, but the key operations it performs when starting are required in my bash script. A messy (and strange) procedure I know, but unfortunately I haven't got any other options. I've gotten around forcefully closing the program with a kill signal, but the program's TUI insists on outputting to wherever it's run. I've tried redirecting both stdout and stderr to /dev/null and running the program in the background by suffixing an ampersand, but simply can't get it to play ball. I believe the cause is the program spawns other processes, and the output redirection of the parent process doesn't affect them. Is there any trick I can utilise to redirect all output from child processes too?

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• CPU load, USB connection vs. NIC

  - by T.J. Crowder

  In general, and understanding the answer may vary by manufacturer and model (and driver, and...), in consumer-grade workstations with integrated NICs, does the NIC rely on the CPU for a lot of help (as is typically the case with a USB controller, for instance), or is it fairly intelligent and capable on its own (like, say, the typical Firewire controller)? Or is the question too general to answer? (If it matters, you can assume Linux.) Background: I'm looking at connecting a device (digital television capture) that will be delivering ~20-50 Mbit/sec of data to a somewhat under-powered workstation. I can get a USB 2 High-speed device, or a network-attached device, and am interested in avoiding impacting the CPU where possible. Obviously, if it's a 100Mbit NIC, that's roughly half its theoretical inbound bandwidth, whereas it's only roughly a tenth of the 480 Mbit/second the USB 2 "High Speed" interface. But if the latter requires a lot of CPU support and the former doesn't...

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• Prevent audio recording applications from picking up non-microphone audio output

  - by hheimbuerger

  When talking to people over Mumble/Teamspeak/Ventrilo, I have a few who are broadcasting all of their audio output (e.g. music playing in the background, game sounds, etc.) whenever they are sending -- in addition to the microphone signal. I don't have this problem myself, so it's hard for me to troubleshoot remotely, but I'm interested in collecting solutions for this problem for Windows XP, Vista and 7, so that I can link them to this question. Links to other related SU questions are highly welcome as well, but I couldn't find any. Most people seem to try to either get microphone to feed back into the audio output or turn exactly that off, which is different from this problem. I'm talking about the opposite problem, the output being fed into the input.

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• Why is my ipad's wireless so flakey?

  - by Mark

  I'm the proud owner of a new IPad here in the UK. All is good, except for the wifi, which is a bit flakey. It connects fine to my Draytek router which is set for WPA/WPA2 and 56g only, displaying full signal strength. Then, after a few minutes, it goes down to minimum strength... And sometimes it goes back up again. A few times, it seems to loose connection completely, and needs to be turned off and on again. I've looked at the Apple support site, and have tried their recommendations (which are not really very relevant), but still nothing. I've tried setting the router to wpa2 only, and setting long-preamble. Right now, I guess I want to know if it's a hardware problem with my device and should be returned, or if it's a problem with all ipads which will be resolved. Guess I could take it back to the Mac genius bar, but I find those guys so incredibly pretentious and, frankly, rather useless, that i'd rather wait until I've exercised other options!

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• Setting up a linux server to share an internet connection.

  - by Skizz

  I in the process of reconfiguring my network. It is currently like this: internet - modem - wireless router - wired server/clients | |---- wireless clients but I need to move the router to get a better signal for the wireless clients. So, I'm looking at this: internet - modem - server - switch - wired clients | |---- wireless router - wireless clients How do I set up the server to enable this? Also, what set ups do the clients need. The server is Ubuntu 9.04 and the clients are a mix of Windows XP / 7, Ubuntu and printers. I believe this new set up will allow me to control access to the internet, which would be useful.

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• The ghost of icons past

  - by Kenneth Cochran

  I am fortnightly( or an approximation thereof) visited by the ghosts of icons, long departed. These apparitions only reveal themselves momentarily after I've logged in then vanish. Returning from whence they came. I've investigated their history and found no clues as to why they continue to haunt me. I sought out an exorcist but those I found were only qualified to expel spirits of humans and demons. Not one had any experience with digital poltergeists. Perhaps praying to Saint William of Redmond will improve the Vista before me. Dost thou agree?

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• Apache Serving 403 Forbidden after OS X Snow Leopard Upgrade to Version 10.6.6

  - by Ian Oxley

  I've just upgraded my MacBook Pro to OS X Snow Leopard version 10.6.6 and now Apache is misbehaving: requests to http://localhost/ generate a 403 Forbidden response -- FIXED requests to any of my virtual hosts seem to generate a 200 Ok response, but contain zero bytes Some further info that might be useful: I'm using the Apache that comes bundled with OS X. I'm using PHP from http://www.entropy.ch/software/macosx/php/ (which is in /usr/local/bin) I've had look at the Apache error log and the only error seems to be the following: [notice] child pid 744 exit signal Segmentation fault (11) I'm completely stumped by this. Any help would be much appreciated. UPDATE Ok, I've managed to resolve the 403 Forbidden error thanks to http://techtrouts.com/mac-os-x-105-web-sharing-forbidden-403-on-httplocalhostusername/ I'm still having the second problem though for any request e.g. this now happens when I request http://localhost

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• Annex-A vs Annex-B ADSL splitters

  - by Odys

  While trying to improve our Adsl connection, I found that we use a splitter that is from an unknown ventor and have no clue whether is for AnnexA (PSTN) or AnnexB (ISDN) line. Is it possible that somebody used the wrong splitter and just because it connected nobody ever cared? We have an ISDN line but the splitter used is blank. I am not really sure if it is AnnexB. Would it be possible to use an AnnexA filter over an ISDN line (even with that much signal loss)? (I am posting here because this is about our connection to the rack, I'm not sure if there is a more proper SExchange site)

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• Apache stopping downloads part way through

  - by Ben Smiley

  On my site there are some digital files which can be downloaded through a PHP script. The script works fine for small files but large files i.e. 115MB cannot be downloaded successfully. The connection dies after around 15 minutes but it's not consistent - sometimes longer sometimes shorter. I don't think it's a problem with the script timing out because the download time isn't consistent. Equally it doesn't seem like a memory limit problem because the amount downloaded varies each time. Does anyone know of any Apache or PHP related settings which could cause this kind of problem?

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• What are the limitations of virtual machines?

  - by j-g-faustus

  I'm considering setting up a virtual machine running Windows, with Ubuntu 10.10 as the host OS, for those cases where I have a Windows-only program. I understand that using a VM will lose some performance, but are there other limitations to what the OS in a virtual machine can do compared to "running on bare metal"? For example: Can a VM play games, like Dragon Age Origins or Civilization V? (Possibly with poorer framerates and/or lower resolution, but does it play at all?) Can a VM rip DVD/Blue-ray using AnyDVD or similar Windows program? Can a VM handle new hardware that requires dedicated drivers, but the drivers are only available for the OS running inside the VM? (Ex. graphics card, digital camera, card reader for smart card authentication.) Is it possible to say anything about "general limitations" of VMs, or is this wholly dependent on the specific VM?

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• Revo 3610 not doing hdmi handshake

  - by DoomStone

  I am having a problem with my Revo 3610 witch is connected to my tv via hdmi. For some reason will it not do the hdmi handshake with the tv, so my tv does not think that there are anything in the hdmi port. I have tested the tv and it works find, with my laptop and dvd. It dose work some times, but this time have it failed for 2 days in a row, and i have tried rebooting, turning the tv off and on, and so on nothing helps. I can trick the TV to listen to the HDMI with connecting with my laptop and then change the hdmi back to my revo, this on the other hand results in the image going thoug nicely but there are a big fat "Check signal cable." on the screen. I have also tryed changing the resolution in the revo but this dose not help ether. Have any one had this problem before, and if so how did you fix it? Example: http://i.imgur.com/gguZ4.jpg

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