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• MongoDB on FreeBSD

  - by Hartator

  We are currently using MongoDB 2.0.0 on MacOS but our servers are running FreeBSD. The most recent port of MongoDB is the 1.8.3 version. I have tried to compile the 2.0.0 by hand but I came across errors that I didn't manage to fix. I came across on the Internet a few old resources which are saying that MongoDB does not run well on FreeBSD mainly for performance issue (memory mapped files). Is that true ? Does it mean we have to switch our server to another OS ? Thanks for your opinions! Sources : http://groups.google.com/group/mongodb-user/browse_thread/thread/8131b7e5a5c710d9 http://ivoras.net/blog/tree/2009-11-05.a-short-time-with-mongodb.html

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• MySQL on Windows - how do I set the wait_timeout for connections using named pipes?

  - by gustafc

  I use a MySQL database running on a Windows box, and for performance reasons I'm connecting to it using named pipes. The (Java) application using the database (through Hibernate) can let the connection lie idle for quite a long time, which causes the connection to fail with the following message: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 33 558 297 milliseconds ago. The last packet sent successfully to the server was 33 558 297 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. autoReconnect unfortunately has no effect (and neither does autoReconnectForPools), but the wait_timeout docs state that wait_timeout only applies "to TCP/IP and Unix socket file connections, not to connections made via named pipes, or shared memory". How can I change the wait_timeout for named pipes?

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• Eclipse: would more CPU cores with HyperThreading help increase speed?

  - by Dylan

  I'm programming a very large project in Eclipse. Right now I use a dual core machine with 2GB RAM, but Eclipse is sometimes busy for minutes (refreshing/indexing/building), so I'm upgrading to a new machine (with 16GB RAM and an SSD). Now I must choose between an Intel 2500K or an Intel 2600K that has HyperThreading. The price difference is about $100. Would that be worth it, for Eclipse, or is more memory/faster drive much more important for Eclipse ? Can Eclipse make use of the HyperThreading at all?

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• ORA-01019 error only as an administrator

  - by Mike

  I'm having a strange problem. I've installed the Oracle 10g client on a terminal server running Windows Server 2008R2. When I try to connect to Oracle, using, say, Toad, I receive the error "ORA-01019 unable to allocate memory in the user side". But this only happens if I'm logged in as an administrator. If I connect as a normal user, I can connect without issue. Also -- if a normal user is connected, I can then connect without a problem as an administrator. Any thoughts?

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• How can I restore Outlook 2007 from a PST file without having to import everything?

  - by schnapple

  I recently upgraded to Windows 7 and went the "format from scratch" route. I backed up my C:\ drive to the free space on my D:\ drive. So now I have Outlook 2007 reinstalled and I have my .pst files and so forth from the previous installation. If memory serves the answer on getting all those emails back into Outlook again is "create a new .pst file for the account and then reimport everything". What I'd like to do is be able to just put the .pst file where it's supposed to go and then have Outlook 2007 just "remember" everything. But I'm pretty sure this doesn't work. Is there a way to restore Outlook from a pst file without having to re-import everything?

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• Shell script with ImageMagick: hangs forever?

  - by AP257

  I've generated a shell script that uses ImageMagick to convert and crop around 18000 images. Here's a sample entry (so there are 18000 of these): if [ ! -f ./cropped/16333-1.png ] then convert -crop 724x118+876+1989 ./lin/34.png ./cropped/16333-1.png echo cropping 16333-1 fi if [ ! -f ./cropped/16333-1_thumb.png ] then convert -define jpeg:size=400x100 ./cropped/16333-1.png -thumbnail '400x100>' -background transparent -gravity center -extent 400x100 ./cropped/16333-1_thumb.png echo thumbing 16333-1 fi The script only runs for about 2000 images before hanging forever. Am I missing something, or leaking memory somewhere? Thanks for your help!

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• Linux PCIE Physical Bus Address

  - by Without me Its just Aweso

  I am working on designing a custom PCIexpress card. I am trying to write a kernel module that will DMA my custom card. Right now when i plug the card into linux no valid PCI device shows up (meaning I probably have a error on my end, i know) however, If I halt the system at startup in the bootloader (uboot) I am able to directly access the card as I know in uboot the physical memory address that is mapped to my device. Is there a way I can access the card in a simliar fashion in linux? Thanks, Stephanie

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• Tomcat - virtualhosting - name / ip / port - based

  - by lisak

  Hey, what are the usage scenarios for these kinds of virtual hosting ? Name Based - typical tomcat virtual hosting, one HOME instance with many contexts, each as an individual host IP based / port based - multiple instances of tomcat ( how is it with performance and memory consuption?) running on IP aliases (virtual IPs) for one network adapter, usually behind http apache server that can run name based virtual hostings. Otherwise I can't figure out how would I forward requests in iptables/firewall based on IP address, which is just one. How is IP based virtual hosting done as to Tomcat and multiple instances ? I'd like to hear some usage scenarios from your experience. How are you running your applications. Cause there are applications having it's own modified classloader and they are developed in a way to run alone withing a tomcat instance. Then there are trivial applications which can run within one instance without problems. Many thanks

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• Can I optimize this mod_wsgi / apache file better?

  - by tomwolber

  Hi! I am new to Django/Python/ mod_wsgi, and I was wondering if I could optimize this file to reduce memory usage: ServerRoot "/home/<foo>/webapps/django_wsgi/apache2" LoadModule dir_module modules/mod_dir.so LoadModule env_module modules/mod_env.so LoadModule log_config_module modules/mod_log_config.so LoadModule mime_module modules/mod_mime.so LoadModule rewrite_module modules/mod_rewrite.so LoadModule setenvif_module modules/mod_setenvif.so LoadModule wsgi_module modules/mod_wsgi.so LogFormat "%{X-Forwarded-For}i %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined CustomLog /home/<foo>/logs/user/access_django_wsgi.log combined ErrorLog /home/<foo>/logs/user/error_django_wsgi.log KeepAlive Off Listen 12345 MaxSpareThreads 3 MinSpareThreads 1 MaxClients 5 MaxRequestsPerChild 300 ServerLimit 4 HostnameLookups Off SetEnvIf X-Forwarded-SSL on HTTPS=1 ThreadsPerChild 5 WSGIDaemonProcess django_wsgi processes=5 python-path=/home/<foo>/webapps/django_wsgi:/home/<foo>/webapps/django_wsgi/lib/python2.6 threads=1 WSGIPythonPath /home/<foo>/webapps/django_wsgi:/home/<foo>/webapps/django_wsgi/lib/python2.6 WSGIScriptAlias /auctions /home/<foo>/webapps/django_wsgi/auctions.wsgi WSGIScriptAlias /achievers /home/<foo>/webapps/django_wsgi/achievers.wsgi

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• Computer Components

  - by Martin

  What is the role of a motherboard in terms of how components communicate with the processor (via the system busses). Therefore, for each component, which communication bus is involved and what is the route that data takes from the component to the processor, including; The bus name Whether bus is serial or parallel The name of any bridges involved Also, what is the the role of a bridge The components are: Internal components: Floppy Drive, Hard Drive, CD/DVD Drive, Memory, Processor Power supply, Graphics card & Sound card External devices: Monitor, Keyboard, Mouse (PS2 & USB), Printer, Pen Drive I have absolutely no idea of what the routes are and how motherboards communicate, could someone give me a start here? Thanks.

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• No virtual console on ubuntu 12.10

  - by Buzzzz

  When I try to do a ctr-alt f(1-6) in ubuntu 12.10 I only get a black screen with a blinking cursor but no login prompt. Any ideas on what could be wrong? It is a fresh install of 12.10 using a amd radeon 5850 graphics card. i have tried different things in my /etc/default/grub but at the moment I use the following: # If you change this file, run 'update-grub' afterwards to update # /boot/grub/grub.cfg. # For full documentation of the options in this file, see: # info -f grub -n 'Simple configuration' GRUB_DEFAULT=0 #GRUB_HIDDEN_TIMEOUT=0 GRUB_HIDDEN_TIMEOUT_QUIET=true GRUB_TIMEOUT=10 GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian` GRUB_CMDLINE_LINUX_DEFAULT="quiet splash vga=normal" #GRUB_CMDLINE_LINUX="vga=0x0376" #RUB_CMDLINE_LINUX_DEFAULT="vga=0x014c" #GRUB_CMDLINE_LINUX="vga=0x014c" #GRUB_GFXPAYLOAD_LINUX=1600x1200x24 # Uncomment to enable BadRAM filtering, modify to suit your needs # This works with Linux (no patch required) and with any kernel that obtains # the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...) #GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef" # Uncomment to disable graphical terminal (grub-pc only) #GRUB_TERMINAL=console

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• In Linux, when I use the PS command, why do I see multiple lines for www-data?

  - by johnlai2004

  I have a LAMP server that uses ubuntu 9.10, apache2, mysql5 and php5. When I login as root through the shell, I run a "ps aux" command and see something like the following www-data 3151 0.1 4.3 220024 31032 ? S 12:22 0:00 /usr/sbin/apache2 -k start www-data 3153 0.2 3.6 214776 26020 ? S 12:22 0:01 /usr/sbin/apache2 -k start www-data 3162 0.3 5.1 225060 36920 ? S 12:26 0:01 /usr/sbin/apache2 -k start www-data 3163 0.1 4.1 218872 29664 ? S 12:26 0:00 /usr/sbin/apache2 -k start How come I see multiple lines for www-data? Does each line represent an actual user on my website? I run into memory issues at times, so I'm trying to determine if these www-data statistics are related.

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• How do I diagnose a HP Notebook which has hardware issues?

  - by Rob

  My HP DV6t-2300 recently crashed while using FLV Player. It wouldn't start up after this so I had to do a hardware reset (remove power sources, hold down power button ~15 seconds, put back power sources). After this it would turn on, but start up would freeze in Ubuntu, Windows 7, Ubuntu Recovery Mode, and various Linux Live CDs. The only successful way to boot was in Windows 7 Safe Mode. The HP Customer Service was very polite, but they are trying to blame it on a corrupt operating system which is clearly not the case (since I have tried 4 operating systems and none work). I am thinking it might be the GPU since 1) I was watching movies when it crashed and 2) Windows Safe Mode might not use the dedicated GPU. I already ran Memory and HDD tests and there were no detected errors. Any ideas of what's wrong, or suggestions for tests that I should run in safe mode? Should I try reinstalling Windows 7 to convince HP that it's not the OS?

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• Macvim lags while Vim on terminal is buttery smooth

  - by SaamJB

  I am running OS X Lion 10.7.3 and Macvim runs significantly slower than vim on the terminal for me. All movement commands in Macvim are much slower. Moving up and down in visual mode is equally as laggy. I see none of this lag when using vim from the terminal. Does anyone know what the reasons may be? I am running NERDtree on every open tab, and I know this contributes some memory overhead and potentially some slow down; but even when I don't run NERDtree Macvim runs much slower than vim from the terminal. Any help in solving this would be greatly appreciated.

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• nVidia driver is not installed for x64 Windows 7 (Vaio VGN-SZ460N)

  - by Sergey Osypchuk

  I just upgraded memory to 4GB for Sony Vaio VGN-SZ460N laptop and trying to install Windows 7 x64. All works fine with default drivers, except video - I am not able to set resolution more than 1024x768. Technical specification says that this model is using: Chipset : Intel® 945GM Processor : NVIDIA® GeForce® Go 7400 notebook graphics processing unit (GPU) and Intel® Graphics Media Accelerator 950 I was trying to use Intel 945GM driver, for Windows 7 Ultimate x64 and get error: This computer does not meet the mininum requirements for installing the software Also, I was trying to download nVidia GeForce Go 7400 x64 but it says that there is no compatible hardware. Actually, it has disclaimer that those drivers doesn't work for Sony vaio and recomendation to use OEM website. Sony website has only 32-bit version of driver which says that it cannot be installed and x64 should be used... Any ideas?

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• Where exactly does a portable app is running when the usb stick is pulled out without closing that app?

  - by Selin Peck

  Where exactly does a portable app is running when the usb stick is pulled out without closing that app? Is it in memory? Is it written the on hard disk as temporary files (where exactly is it, appdata or where)? Does that mean the next user of the pc could gain access just clicking that from the system tray and saving to other folders? How about when the system crash and that portable app is not closed the normal way? On the next open, will it stay somewhere on temporary folders?

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• Ubuntu: Is there a good tabbed PDF viewer?

  - by Frank

  Is there a good non-bloated PDF viewer for (Ubuntu) Linux that supports tabs? I don't want to use Acrobat Reader because it is slow and takes much memory, and my computer isn't the fastest. I know the alternative readers evince and foxit, but they don't support opening different PDF files in tabs. (foxit has that feature on Windows, but the Linux version 1.1, which I just tried, doesn't have it.) For evince, I know many people would like this functionality, but they get ridiculed by Ubuntu people (see here), who say that tabs are the task of a window manager. If that is the case, how can I put all evince windows into one in GNOME?

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• What contributes to smooth online video streaming?

  - by Wesley

  I had a general question about streaming videos online; in particular, on YouTube. What really is required to smoothly stream videos at 360p or 480p? Then for that HD goodness, what really allows a computer to smoothly stream 720p and 1080p? I'm not too sure whether it's to do with the CPU (speed, # cores, cache size), GPU (chipset, VRAM, memory type) or even HDD (IDE vs SATA). What contributes to the ability to stream regular videos and, furthermore, high-definition videos online?

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• Linux: don't use file system cache under a directory

  - by GetFree

  For a PHP website I'm monitoring, I need to see what files are being used each time the browser makes a request. I thought of using find . -type f -amin 1. With that I get all files which were read in the last minute (it's a developing server so only I am using the website). I took care of removing the noatime attribute from the mounting point. However there must be something else that's preventing the kernel from reading the actual files on disk because the access time is not being updated when I read a file. I guess it must be the file-system cache which is retrieving the files from memory. Is there a way to disable file caching under a specific directory? (public_html in my case) Also I read somewhere that there is the nobh mounting atributes which apparently disables file caching under that mounting point, but I'm not sure.

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• Installing Linux from External Card Reader

  - by Subhamoy Sengupta

  I have this problem. I was experimenting if I could use a memory card (SDHC) as an USB drive for all intents and purposes, and when I put the card in an USB card reader, I can use it just like regular USB stick and it also shows up in the BBS popup menu as an USB stick. When I tried to create an installation media out of it like this: sudo dd if=/path/to/image of=/dev/sdb And tried to boot from it, simply nothing happened. Cursor blinked a couple times, and jumped to the GRUB of my pre-existing GNU/Linux installation. What am I missing here? Is this not doable? I tried this with Xubuntu 12.04 and ArchLinux, by the way. I have also tried UNetBootIn instead of dd. Nothing happened differently.

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• Computer cannot detect hard disk

  - by Nrew

  Details: BIOS: AMI Bios, set primary master to Auto OS: Windows XP Sp2 Memory: 384 Mb Processor: Pentium 3 yeah this one is really very old. And some of the capacitors in the motherboard are already bulging. It detected the hdd yesterday when were trying to fix it and install xp. But today it cannot boot and said: Boot failure. What can you suggest that I would do to revive this old machine. What would be the problem, is it the hdd, the ide cable or the motherboard.

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• AMD FX 8350 potentially overheating

  - by rhughes

  I am worried that my CPU is overheating when running at maximum capacity. I have not overclocked the machine. The machine often powers down after a couple of minutes of max CPU usage. I get the following events in the Event Log after the crash: Log Name: System Source: Microsoft-Windows-Kernel-Power Date: 11/10/2013 12:05:40 Event ID: 41 Task Category: (63) Level: Critical Keywords: (2) User: SYSTEM Computer: home-pc Description: The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly. What can I do to confirm this or further narrow down this issue? Due to the sudden nature of the crash, no MEMORY.DMP is created I believe. I am happy to post any extra information that is needed.

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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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• Can ECC registred RAM 512 MB DDR-400 be used on thinclients - specifically Neoware CA10/CA22?

  - by Ramaswami Murugan

  Can ECC registered RAM 512 MB DDR-400 be used on thin clients - specifically Neoware CA10/CA22? Neoware thin clients (now HP Thin clients e100/e140) have 2 slots for a max of 1 Gb of DDR-400 RAM (184 Pin PC3200). I notice that the price of ECC reg RAM is considerably less than that of non-reg RAM ($10 for ECC reg 512 MB vs $24 for non-ECC reg 512 MB) so this approach is worth it for me to upgrade my memory on numerous thin clients (approx 40). The BIOS is Phoenix E686 and the chipset is VIA 800MHz - 1 Ghz.

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• Copying windows 8 Users folder having long long paths

  - by bilal.haider

  I was trying to move my "Users" folder in Windows 8 as described here and here. But when I try to copy the folder using "xcopy" in Windows Installation Disk Repair Mode, after some files are copied, I get "insufficient memory". The files on which the error is given are like C:\Users\Bilal\Application Data\Application Data\Application Data.........Application Data\Application Data..... What is the point in such directories within directories? I also tried copying them using Mini Windows XP, but the problem was there too.. Also tried copying using Parted Magic Live CD... but still.. So now, how can I move them? Another Question. Is moving such/ system files using Linux a good idea? Does it do anything to permissions?

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