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  • How to understand computer science as a whole?

    - by MrCellophane
    I am a college student in Computer Science, I have been studying CS for a long time. But even till today, I still feel so confused about a lot of things. First of all, I have solid foundation in alg, data structure, and OOP, but I don't have a clear understanding of the whole system of the subject. I studied database, alg, data structure, OOP, network, software engineering, OS, and a lot of courses. I know what they are, but I don't know how to connect them together. Is there a way to have a clear understanding of the architecture of the subject? And is there a way to know what technology is used to do what? For example, in interviews, when people ask me alg, data str, Java, OS or any other specific field, I could answer, but when they ask some other very general about the field, I have no idea. Well, I know my question maybe a little bit confusing, but what my situation is I don't even know how to ask a clear question. I don't know my question, it's totally a mess in my head. Is there a way to make it clear?

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  • Optimal Configuration for five 300 GB 15K SAS Drives

    - by Bob
    I recently acquired an HP Z800 workstation that has five 300 GB 15K SAS Drives. This system will be dedicated to running multiple virtual machines under VMware Workstation (Note: I'm not using ESXi because I do plan to use the system for other purposes.). For the host OS, I plan to install RHEL 5. My number one concern is guest performance. For example, should I create a RAID 10 array for the OS and virtual machine storage with four of the drives and reserve the 5th? Or, is there a solution that will provide better performance?

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  • MySQL query works in Workbench but gives error code 63 from PHP

    - by smund3
    I am making a poll system with PHP/MySQL and have made created a MySQL user for the system to use. However, whenever I try to run a query from PHP as that user, I get error code 63, which after some Googleing I found out means: OS error code 63: Out of streams resources If I make the PHP script use an almighty user instead, everything works fine, so it looks like it has something to do with permissions. I am using a non-persistent connection. I have Googled a lot but I haven't found anything even slightly relevant to this issue. What could cause this error? EDIT: Now it actually started giving me a different error: OS error code 65: Package not installed ...all I did was revert the script to using the poll user instead of the almighty one.

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  • linux recommendations for older pc

    - by jdamae
    Hi, I'm new to Linux and I am interested in installing the OS on an older computer I have. I want to setup a webserver and install php, perl. My pc is an older HP Pavillion a255c, Intel Pentium 4 with 512ram. I will probably add some more memory later. This pc is more like a sandbox than anything, but would like to get quickly started with the OS. Is there a particular flavor of linux I would need to download based on my older computer? Any recommendations? I was thinking about Ubuntu but not sure what version to go with. Thanks for your help.

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  • It could be worse....

    - by Darryl Gove
    As "guest" pointed out, in my file I/O test I didn't open the file with O_SYNC, so in fact the time was spent in OS code rather than in disk I/O. It's a straightforward change to add O_SYNC to the open() call, but it's also useful to reduce the iteration count - since the cost per write is much higher: ... #define SIZE 1024 void test_write() { starttime(); int file = open("./test.dat",O_WRONLY|O_CREAT|O_SYNC,S_IWGRP|S_IWOTH|S_IWUSR); ... Running this gave the following results: Time per iteration 0.000065606310 MB/s Time per iteration 2.709711563906 MB/s Time per iteration 0.178590114758 MB/s Yup, disk I/O is way slower than the original I/O calls. However, it's not a very fair comparison since disks get written in large blocks of data and we're deliberately sending a single byte. A fairer result would be to look at the I/O operations per second; which is about 65 - pretty much what I'd expect for this system. It's also interesting to examine at the profiles for the two cases. When the write() was trapping into the OS the profile indicated that all the time was being spent in system. When the data was being written to disk, the time got attributed to sleep. This gives us an indication how to interpret profiles from apps doing I/O. It's the sleep time that indicates disk activity.

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  • Still can't mount windows 8 drive after restart

    - by Ishai Bloch
    After following the instructions in other posts, I am still getting the same error when I try to mount my Windows 8 drive in Ubuntu 14.04 on a dual boot system. I have disabled fast start after shutdown, hybrid hibernation, and the preinstalled Asus Instant On service. I have tried restarting Windows rather than shutting down. In all cases I get the same error message, namely: Error mounting /dev/sda4 at /media/jesse/OS: Command-line `mount -t "ntfs" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,dmask=0077,fmask=0177" "/dev/sda4" "/media/jesse/OS"' exited with non-zero exit status 14: Windows is hibernated, refused to mount. Failed to mount '/dev/sda4': Operation not permitted The NTFS partition is in an unsafe state. Please resume and shutdown Windows fully (no hibernation or fast restarting), or mount the volume read-only with the 'ro' mount option. I did not have the same issue before upgrading from Ubuntu 12 to 14. For what it's worth my computer is supposedly a "hybrid" with an SSD drive installed, although I can't see that the SSD drive is being used at all with my present settings. Any thoughts?

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  • Could not load file or assembly 'System.Data.SQLite' or one of its dependencies. An attempt was made to load a program with an incorrect format.

    - by Om Talsania
    Problem Description: Could not load file or assembly 'System.Data.SQLite' or one of its dependencies. An attempt was made to load a program with an incorrect format. Likely to be reproduced when: You will usually encounter this problem when you have downloaded a sample application that is a 32-bit application targeted for ASP.NET 2.0 or 3.5, and you have IIS7 on a 64-bit OS running .NET 4.0, because the default setting for running 32-bit application on IIS7 with 64-bit OS is false. Resolution: 1. Go to IIS Management Console Start -> Administration Tools -> Internet Information Services (IIS) Manager 2. Expand your server in the left pane and go to Application Pools 3. Right click to select ‘Add Application Pool’  4. Create anew AppPool. I have named it ASP.NET v2.0 AppPool (32-bit) and selected .NET Framework v2.0.50727 because I intend to run my ASP.NET 3.5 application on it. 5. Now right click the newly created AppPool and select Advanced Settings 6. Change the property “Enable 32-Bit Applications” from False to True  7. Now select your actual web application from the left panel. Right click the web application, and go to Manage Application -> Advanced Settings  8. Change the Property “Application Pool” to your newly created AppPool.  And… the error is gone…

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  • Fedora 11 System - Failed Hard Drive Removed, and Boot gets GRUB Hard Disk Error

    - by Mindful
    Greetings, I have a machine with a 120GB ATA drive that has what I thought to be non-essential data on it. I also have a 320GB SATA hard drive with the OS/Application/Files (good data I want to keep). My 120GB ATA is failing I believe, as my computer kept slowing to a halt. However, when I move the drive from BIOS my computer will not start, says "GRUB Hard Disk Error". I know that my Fedora system has an LVM setup. I am looking to just remove the 120GB drive from "the mix", and just have one hard drive. How do I recover ? Thank you. I have access to a Linux Live CD right now and can make any changes. However, it won't boot into my OS - it fails. UPDATE: here's my Grub.Conf # grub.conf generated by anaconda # # Note that you do not have to rerun grub after making changes to this file # NOTICE: You have a /boot partition. This means that # all kernel and initrd paths are relative to /boot/, eg. # root (hd1,0) # kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00 # initrd /initrd-version.img #boot=/dev/sda1 default=0 timeout=5 splashimage=(hd1,0)/grub/splash.xpm.gz hiddenmenu title Fedora (2.6.30.10-105.2.23.fc11.i686.PAE) root (hd1,0) kernel /vmlinuz-2.6.30.10-105.2.23.fc11.i686.PAE ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.30.10-105.2.23.fc11.i686.PAE.img title Fedora (2.6.30.9-102.fc11.i686.PAE) root (hd1,0) kernel /vmlinuz-2.6.30.9-102.fc11.i686.PAE ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.30.9-102.fc11.i686.PAE.img title Fedora (2.6.27.24-170.2.68.fc10.i686.PAE) root (hd1,0) kernel /vmlinuz-2.6.27.24-170.2.68.fc10.i686.PAE ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.27.24-170.2.68.fc10.i686.PAE.img title Fedora (2.6.27.24-170.2.68.fc10.i686) root (hd1,0) kernel /vmlinuz-2.6.27.24-170.2.68.fc10.i686 ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.27.24-170.2.68.fc10.i686.img title Fedora (2.6.27.21-170.2.56.fc10.i686) root (hd1,0) kernel /vmlinuz-2.6.27.21-170.2.56.fc10.i686 ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.27.21-170.2.56.fc10.i686.img title Fedora (2.6.27.19-170.2.35.fc10.i686) root (hd1,0) kernel /vmlinuz-2.6.27.19-170.2.35.fc10.i686 ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.27.19-170.2.35.fc10.i686.img title Upgrade to Fedora 10 (Cambridge) kernel /upgrade/vmlinuz preupgrade repo=hd::/var/cache/yum/preupgrade stage2=http://chi-10g-1-mirror.fastsoft.net/pub/linux/fedora/linux/releases/10/Fedora/i386/os/images/install.img ks=hd:UUID=f11769ba-29bc-46de-8c40-a949720a438e:/upgrade/ks.cfg initrd /upgrade/initrd.img title Win rootnoverify (hd0,0) chainloader +1

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  • How to test a LDAP connection from a client

    - by FELDAP
    How to check the LDAP connection from a client to server. I'm working on the LDAP authentication and this client desktop needs to authenticate via a LDAP server. I can SSH to the LDAP server using LDAP user but When in desktop login prompt, I can't login. It says Authentication failure. Client machine has Cent OS 6.3 and LDAP server has Cent OS 5.5 LDAP software is Openldap. LDAP servers logs doesn't even show any messages. So, how to test whether the client can successfully connect to LDAP or not.

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  • Ubuntu on an XPS 14 Ultrabook with mSATA cache and 500GB HD - how to partition for dual boot?

    - by JDS
    I am getting an XPS 14 ( http://www.dell.com/us/p/xps-14-l421x/pd ) and I want to dual-boot Windows and Ubuntu. This thing has a 500GB standard HD and a 32GB mSATA that can be used as cache. Does anyone know how this thing is partitioned? Is the OS installed on the mSATA drive and data is on the big HD? Is there a BIOS controller or maybe even a Windows driver that makes the mSATA drive and 500GB HD appear contiguous? I get the impression that something makes the mSATA be used invisibly as cache, but I can't find any technical documentation how that works. My primary concern here is wrt dual-booting Ubuntu. I want to know if I need to partition the mSATA separately, or the big HD, or just partition the "magic" contiguous disk space that appears available to the OS.

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  • Disk Utility Restore causes "Could not validate resource - Invalid Argument"

    - by Yahoo
    I have a problem with Disk Utility on Mac OS X 10.6. I have an image of Windows that I would like to use as a bootable volume on a pen drive or external hard drive. The thing is: When I try to restore the volume from the image I get an error: "Restore Failure: Could not validate resource - Invalid Argument" I read some information about that error on the Internet. I converted the image into .iso (Mac OS Extended/ISO (Joliet) Hybrid Image) format and then got this error: "Restore Failure: Could not find any scan information. The source image needs to be imagescanned before it can be restored." When I try to scan the image for Restore, I get the first message. I really read a lot of information about this topic on the Internet, but I haven't found the solution. I tried both ISO and DMG formats; I don't know which is best.

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  • Microsoft secure downloader not finishing download

    - by Goran_Mandic
    I am downloading Windows 8 RTM using Microsoft's secure downloader provided by my school's DreamSpark account. The OS I'm currently on is Windows 8 preview. Once the download reaches 100%, it restarts to 0%. I open the download path folder, and find the en_windows_8_x64_dvd_915440.sdc file and the en_windows_8_x64_dvd_915440.scd.log file. The log file contains only one line : "Unpacking File: C:\Users\en_windows_8_x64_dvd_915440.sdc" I was unable to unpack the file using 3rd party software, and there seems to be no official software made for unpacking this type of file. What can I do to avoid downloading the OS illegally, even though I have my own product key?

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  • Can i create a virtual machine on my laptop to be used with another monitor?

    - by Ranhiru
    OK, the scenario is like this... I have my laptop... and I have another user without a unit. He has only a keyboard, mouse and a monitor. Is there anyway that I can make him use my computer by creating a virtual environment which he will access, BUT, without interfering with my work. I use my laptop and view my OS from the laptop monitor. I create a virtual environment (some OS probably XP) and run it. The virtual environment is displayed in the connected monitor and the other user uses it using the extra keyboard/mouse and the monitor but without interfering my screen! Is this possible? Stupid? Futuristic? Need more hardware?

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  • List/remove files, with filenames containing string that's "more than a month ago"?

    - by Martin Tóth
    I store some data in files which follow this naming convention: /interesting/data/filename-YYYY-MM-DD-HH-MM How do I look for the ones with date in file name < now - 1 month and delete them? Files may have changed since they were created, so searching according to last modification date is not good. What I'm doing now, is filter-ing them in python: prefix = '/interesting/data/filename-' import commands names = commands.getoutput('ls {0}*'.format(prefix)).splitlines() from datetime import datetime, timedelta all_files = map(lambda name: { 'name': name, 'date': datetime.strptime(name, '{0}%Y-%m-%d-%H-%M'.format(prefix)) }, names) month = datetime.now() - timedelta(days = 30) to_delete = filter(lambda item: item['date'] < month, all_files) import os map(os.remove, to_delete) Is there a (oneliner) bash solution for this?

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  • How to check if a server runs in pressing mode

    - by Ice
    Hi there, Layout: i have at customer side a server (win2003 R2 SP2 standard edition 32-bit) with a sql-server 2005 and some databases. This system starts with the /3GB-Switch. The system reports 3.25 GB RAM and taskmanager reports the process of sqlserver.exe with 2758255 K as the process with the highest consumption. The OS separates RAM for applications and for itself, normaly 50:50. But here we have the /3GB-Switch aktivated and i think the part for the applications is more than 50% of RAM. Knowledge (or better not knowledge): Somebody told me that if the OS runs out of memory within his part of RAM, the server runs into pressing mode. Questions: What is this pressing mode? Is pressing mode possible at all in this szenario? What should be done to get more performance out of this sql-server, beside optimizing the database and all this stuff.

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  • Virtualbox fullscreen mode problem

    - by AtharvaI
    hi all I have a slightly weird issue with virtualbox. My host OS is Win7 (64-bit) and guest OS is Ubuntu 10.10(64-bit). When I switch to fullscreen mode in virtualbox, ubuntu display resizes to fit my screen size. however, after that the display is not updated. So if i click a menu or something I don't see it appear. but it seems to work in the background. if i click a menu in fullscreen mode, i don't see anything happen, but if then switch to windowed mode I see the menu already open. I have installed virtuabox guest additions. if any has a similar issue or has found a solution please let me know thanks.

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  • Media Drive Permissions

    - by Wade Wofford
    I just switched from a Hackintosh to Linux, and am trying to make sense of it. On my hackintosh, I partitioned a big drive into 3 parts--1 which holds music, 1 for film/tv, and one for the OS. I installed Ubuntu onto the OS partition, and am now trying to make it so I can write to the media drives. I've searched around and tried several things. I tried gksu nautilus in Terminal, which brought me into root permissions. When I select a folder and try to change permissions, I get "The owner could not be changed...Error setting owner: Read-only file system" Ultimately, I have two specific aims: - I want to make it so I can write to the film/tv drive from the ubuntu machine only - I want to make it so I can write to the music drive from the ubuntu machine, or any other machine on the network (all Macs). That is, I want a single music library (an iTunes file) that will serve all Mac laptops/iPads/iPhones on the network, but which XBMC on the Ubuntu machine can also see / read from. Music will be added to the iTunes library via a single Mac laptop, but all other devices should be able to see the music drive.

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  • Motherboard RAM question.

    - by winterwindz
    Firstly I'm new at this. Not a very computer-ish person. So I very much apologize if this is not the right place, but here it goes.. My Motherboard is an Asus P5LD2-SE. I'm running in Win 7 Ultimate 32-bit(x86) OS, 1GB RAM (2x512 MB). I'm planning to upgrade my OS to 64-bit and because I know my Motherboard is a dual-channel, I bought a dual-channel 2 GB RAM (2 pcs). My question is; am I still able use my old RAM ones, since it is 4 slots..? Which in the end will show 5GB. Is it possible? Thank you for your time. =)

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  • Free NTFS partition recovery

    - by Andrei Tanasescu
    I have a 1Tb disk which was partitioned into a ~700gb ntfs disk and a 300gb HFS+ (mac os X). I've accidentally allowed mac os x to wipe the hard-disk and create a single HFS+ partition over the hard-drive. I want to recover my NTFS partition. TestDisk fails to find the NTFS partition, but the DiskInternals solution does find my files. Are there any free alternatives to DIskInternals Partition recovery solution? THe tool should simply go block by block and attempt to reconstruct the files.

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  • Visual Studio 2012 first impressions...no Macros!

    - by bconlon
    Yesterday I installed Microsoft Visual Studio 2012 for the first time (all 8.5GB) and after 20 years of (mostly) happy times using VS they have removed Macros, one of the most handy features.The first thing I wanted to do when I upgraded my VS2010 project was to add a #elseif block to each file. This would usually be simple case of find in files of the previous #elseif and then Ctrl+Shift+R to record a macro which would be: F8 (to select the next file from find list), F3 (to find the correct position in file), Ctrl+V to paste the new code. Then all I would need to do is keep Ctrl+Shift+P (Play Macro) pressed until all the files were processed.But alas Ctrl+Shift+R does nothing! I won’t say that I use Macros every day but it was a very useful feature.To continue my moaning a little more, I also don't like the bland interface. This has been well documented by others, but now I have used it myself, I find it difficult to tell one grey area of screen from another and the lack of colour makes the icons unclear.I also don't see why the menus now need to SHOUT in capital letters?On the plus side, they have now added the ability to see WPF properties in the debugger...a bit of an oversight in Visual Studio 2010. Oh, but you still can't edit and continue on files that contain templated code.Whilst Visual Studio 2012 is not a complete disaster like Windows 8 (why develop a desk top OS to be the same as a Smart device OS), it does not float my boat.Rant over.#

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  • Windows7 issue in mutli- tasking and memory

    - by Nitesh
    I seeming some problem in my windows OS recently, let me first say my system configuration. processor - Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66 GHz Installed memory (RAM) - 4.00 GB (3.00 GB usable) System type - 32 bit operating system I am using two OS in this system, first one is Windows7 and the other is centOS. Well, I am using this from a long time there was no problem , and all of a sudden since from couple weeks I am facing problems in my Windows7 OS. In windows7 i was nearing using multiple jobs almost every time i log in, there was no problem but now i don't no what happen I am not able to do multiple jobs at same time. For example- 1 I am now not able to listen to music in windows media player and view photo's. All of a sudden the system stops working and does not respond and then respond after 5mins and the music get played where it got stopped after 5 mins. 2 When i start browersing internet it hangs all of sudden and doesn't respond for 2 or 3 mins and gets loading. I mean it just happens for every operation i do in the system. Even now typing was also difficult, it gets hanged very frequently even though i am doing single task. I have never come across this kind of problem before. So the first thing i did was to see the useage of the processor and the memory. Well, i thick the useage of the processor was fine, for single task the useage was some where around 3 to 5%. Well, it was something weird i found in the memory, in spite of no task that i was running it was using somewhere around 34 to 41% of memory. So i opened the task manager and click on resource monitor in performance tab. And in the memory section of the monitoring tool i found the usage of my RAM, it was something like this. Hardware reserved - 1029 MB In Use - 1430 MB Modified - 49 MB Standby - 1566 MB free - 22 MB And i could also see Available 1588 MB Cached 1615 MB Total 3067 MB Installed 4096 MB well, this if all i could find out and i have no idea why my computer is acting so weird all of a sudden and the performance problem is growing day by day and i also don't know if there is problem in Bios, i have let it for default settings from long time. please help me and Thank you in advance for reading this and helping me.

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  • Optimal Disk Setup for OLTP SQL Server

    - by Chris
    We have a high transaction (lots of reads and writes) database server (running SQL 2005) that is currently set up with a RAID 1 OS partition (C:) and a RAID 5 data/log/tempdb partition (D:). The C: has 2 drives and the D: has 4 drives. The server has around 300 databases ranging from 10MB to 2GB in size. I have been reading up on best practices for partioning the disks, but would like some opinions on our setup since we are so limited in the number of disks. It seems like RAID 10 is popular, but I dont think we could use it with only 6 total disks to work with. Thanks. Update I went with 3 RAID 1 Partitions (2 disks each) Partition 1: OS, TempDB, Backups Partition 2: Logs Partition 3: Data

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  • Can't boot into XP after setting up dual boot with Win 7 vhd.

    - by bebop
    I set up a dual boot for win 7 from vhd on 2 xp machines. One of them everything went fine, and I get the option to choose the os when I turn the machine on. The other was slightly different in that rather than seeing the current OS disk (the one with XP on) as the c:\ when I was setting up windows 7 vhd during install it saw the disk as d:. I didn't think anything of it and went ahead and created a vhd on the d: drive. Now when I turn this machine on, it boots straight to win7 and I never get the option to choose xp. When I look at the boot option in msconfig, I only see Windows 7. How can I go about adding the old XP drive as a boot option at startup again? Edit: Strangely when I rebooted this time (perhaps the first time since I removed the install DVD) it boots to XP. I suppose I'll just have to reinstall windows 7 again in a new vhd...

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  • How do I recover files from a corrupt VDI file?

    - by Eric P
    Is it possible to repair a corrupt VDI file? The OS on the VDI (XP) doesn't boot at all, it just hangs at a black screen. I was getting file errors before on its last boot, but now its not working at all. Sector viewer shows 'Invalid partition table Error loading operating system Missing operating system'. I tried mounting the file from the host OS, but it just says that the drive isn't formatted. I don't need to be able to run the VDI, but I do need some files that are on it. Is there any way to recover files from the corrupt VDI file?

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