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  • How can I change the amount and size of Linux ramdisks (/dev/ram0 - /dev/ram15)?

    - by Kevin S.
    Using Linux, when I boot I automatically have 16 16MB ramdisks, however, I would like to create one really large ramdisk to test some software. I found that I can adjust the size of the ramdisks already on the system with the kernel boot parameter ramdisk_size however, this makes all 16 ramdisks (/dev/ram0 - /dev/ram15) the size that is specified. So if I want to create a 1GB ramdisk, I would need 16GB of memory. Basically, I want to create one 10GB ramdisk which would be /dev/ram0. How would I go about doing that? I assume there is a kernel boot parameter, but I just haven't found it.

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  • Context switches much slower in new linux kernels

    - by Michael Goldshteyn
    We are looking to upgrade the OS on our servers from Ubuntu 10.04 LTS to Ubuntu 12.04 LTS. Unfortunately, it seems that the latency to run a thread that has become runnable has significantly increased from the 2.6 kernel to the 3.2 kernel. In fact the latency numbers we are getting are hard to believe. Let me be more specific about the test. We have a program that has two threads. The first thread gets the current time (in ticks using RDTSC) and then signals a condition variable once a second. The second thread waits on the condition variable and wakes up when it is signaled. It then gets the current time (in ticks using RDTSC). The difference between the time in the second thread and the time in the first thread is computed and displayed on the console. After this the second thread waits on the condition variable once more. So, we get a thread to thread signaling latency measurement once a second as a result. In linux 2.6.32, this latency is somewhere on the order of 2.8-3.5 us, which is reasonable. In linux 3.2.0, this latency is somewhere on the order of 40-100 us. I have excluded any differences in hardware between the two host hosts. They run on identical hardware (dual socket X5687 {Westmere-EP} processors running at 3.6 GHz with hyperthreading, speedstep and all C states turned off). We are changing the affinity to run both threads on physical cores of the same socket (i.e., the first thread is run on Core 0 and the second thread is run on Core 1), so there is no bouncing of threads on cores or bouncing/communication between sockets. The only difference between the two hosts is that one is running Ubuntu 10.04 LTS with kernel 2.6.32-28 (the fast context switch box) and the other is running the latest Ubuntu 12.04 LTS with kernel 3.2.0-23 (the slow context switch box). Have there been any changes in the kernel that could account for this ridiculous slow down in how long it takes for a thread to be scheduled to run?

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  • recovering raid 0 hard disk

    - by Hiawatha
    I bumped to a huge (for me) problem. I was running dual boot system (win 7 / linux) and at some point I decided to test fedora ( I am new in Linux ). My hard disk conf: 3 hard disks each 1 TB, 2 set to raid 0 with windows running on it and 1 for linux. After installing it from live usb I found out that windows 7 is not in grub anymore and while booting shows raid error. I installed back Ubuntu and ran Disk Utility and checked now I have one disks (raid 0) failed (READ) error. First has 5 bad sectors and second has 1 bad sector. And now I dont know what to do and how to repair. further I dont know which data i could provide to get help. I tried ntfsfix and got this output: Mounting volume... NTFS signature is missing. FAILED Attempting to correct errors... NTFS signature is missing. FAILED Failed to startup volume: Invalid argument NTFS signature is missing. Trying the alternate boot sector Unrecoverable error Volume is corrupt. You should run chkdsk. #sudo ntfs-3g -o force,rw /dev/sdb /media/windows NTFS signature is missing. Failed to mount '/dev/sdb': Invalid argument The device '/dev/sdb' doesn't seem to have a valid NTFS. Maybe the wrong device is used? Or the whole disk instead of a partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?

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  • How to recover data from Dell dimension 9150 RAID 0 on another system?

    - by Adam
    I have a Dell Dimension 9150 which has failed. I'm trying to recover the data. It had two SATA 250GB drives in RAID 0 configuration. I'm trying to use a shuttle PC running Windows7 to recover the data from the drives which contained an XP boot volume. I just want the data, it doesn't have to boot. What program would I need to rebuild / interrogate the drives (one of them is failing the onboard hardware test)? What drivers would I need to install? Windows7 sees the drive as one partition but doesn't see volume information. Ubuntu can see the drive as one partition and also can tell what the drive is called, but can't access the data Any help appreciated!! :)

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  • Windows Software to Save Arbitrary Application State

    - by ashes999
    VM software does a great job of saving state when you "turn it off," allowing instant and immediate return to that previous state. Is there some application for Windows that allows me to do the same thing, for any arbitrary software? It would allow me to save/restore state, possibly via a shell command or button that it appends to every window. Edit: For clarity, there are two types of apps: those that save their own states, and those that save others' states. Those that save their own state are like Chrome, which on load, reloads the windows you had open last time. That's not what I'm asking about; I'm asking for an app that can save the state of other apps, kind of like VM software does; but for any app. (A trivial test would be load notepad++, type a bunch of stuff, and save-state; on reset-state, you should be able to multi-level undo a lot of what you wrote, as if you never shut down the application.)

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  • MySQL can only log in as root, even after creating new users with their own database

    - by ionFish
    Problem: I just set up a Debian Wheezy installation for testing, and installed the LAMP packages and PMA. I can log in as root with my pre-defined password, create/edit/delete both databases and users. The problem comes when I create a new user 'something', set a password for it, and grant it all privileges on a table 'something' (same as the username). Upon connecting, it denies access to the user. Details: Host: localhost using MySQL 5.5.24-8 Creating user: CREATE USER 'something'@'%' IDENTIFIED BY '***';GRANT USAGE ON *.* TO 'something'@'%' IDENTIFIED BY '***' WITH MAX_QUERIES_PER_HOUR 0 MAX_CONNECTIONS_PER_HOUR 0 MAX_UPDATES_PER_HOUR 0 MAX_USER_CONNECTIONS 0;CREATE DATABASE IF NOT EXISTSsomething;GRANT ALL PRIVILEGES ONsomething.* TO 'something'@'%'; Checking privileges: GRANT USAGE ON *.* TO 'something'@'%' IDENTIFIED BY PASSWORD '*92F9DAF5F5129554509489FDB6A433510223C799'; Result: Access denied for user 'something'@'localhost' (using password: YES) More Info: I use this same exact procedure for the Squeeze distribution, and it works perfectly. Is there a chance it's because of Wheezy, or something else? I need to continue using Wheezy because of the updated packages (for this test server -- the others work fine), so 'just use Squeeze' is not an option. Note: I HAVE tried flush privileges; to no avail.

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  • Would there be any problems with DEP turned off?

    - by IneedHelp
    I recently moved to a fresh Windows 8 x64 system and I learned that my favourite firewall (JPF - Jetico Personal Firewall) doesn't get along with Win8x64 (CRITICAL_STRUCTURE_CORRUPTION errors), but I can not do without JPF, so I kind of tried everything I could think of (test mode, debugging, various system changes), but I was still getting blue screens because of the firewall driver/software. I know for sure that it is the firewall that is causing the problems because I get blue screens as soon as I install it and they stop when I uninstall it. I Also tested it thoroughly on virtual computers. Anyway, I have discovered that by completely turning DEP off by using this command: bcdedit.exe /set {current} nx AlwaysOff the firewall would not cause blue screens anymore. So my question is, what could go wrong with DEP completely turned off? Note: I do not care much about hardware/windows security, I keep myself secured by using sandboxes and virtual computers (and I also have backups), so I'm not concerned with viruses and root kits or whatever people are freaking out about.

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  • MySQL documentation writer wanted

    - by stefanhinz
    As MySQL is thriving and growing, we're looking for an experienced technical writer located in Europe or North America to join the MySQL documentation team.For this job, we need the best and most dedicated people around. You will be part of a geographically distributed documentation team responsible for the technical documentation of all MySQL products. Team members are expected to work independently, requiring discipline and excellent time-management skills as well as the technical facilities to communicate across the Internet.Candidates should be prepared to work intensively with our engineers and support personnel. The overall team is highly distributed across different geographies and time zones. Our source format is DocBook XML. We're not just writing documentation, but also handling publication. This means you should be familiar with DocBook, and willing to learn our publication infrastructure.Candidates should therefore be interested not just in writing but also in the technical aspects of publishing documentation. Regarding your initial areas of authoring, those would be MySQL Cluster, MySQL Enterprise Monitor and Backup, and various parts of the MySQL server documentation (also known as the MySQL Reference Manual). This means you should be familiar with MySQL in general, and preferably also with MySQL Cluster and the MySQL Enterprise offerings.Other qualifications: Native English speaker 3 or more years previous experience in writing software documentation Excellent written and oral communication skills Ability to provide (online) samples of your work, e.g. books or articles Curiosity to learn new technologies Familiarity with distributed working environments and versioning systems such as SVN Comfortable with working on multiple operating systems, particularly Windows, Mac OS X, and Linux Ability to administer own workstations and test environment If you're interested, contact me under [email protected].

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  • Good practice on Visual Studio Solutions

    - by JonWillis
    Hopefully a relativity simple question. I'm starting work on a new internal project to create tractability of repaired devices within the buildings. The database is stored remotely on a webserver, and will be accessed via web API (JSON output) and protected with OAuth. The front end GUI is being done in WPF, and the business code in C#. From this, I see the different layers Presentation/Application/Datastore. There will be code for managing all the authenticated calls to the API, class to represent entities (business objects), classes to construct the entities (business objects), parts for WPF GUI, parts of the WPF viewmodels, and so on. Is it best to create this in a single project, or split them into individual projects? In my heart I say it should be multiple projects. I have done it both ways previously, and found testing to be easier with a single project solution, however with multiple projects then recursive dependencies can crop up. Especially when classes have interfaces to make it easier to test, I've found things can become awkward.

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  • Application that provides unique keys to multiple threads

    - by poly
    Thanks all for your help before. So, this is what I came up with so far, the requirements are, application has two or more threads and each thread requires a unique session/transaction ID. is the below considered thread safe? thread 1 will register itself with get_id by sending it's pid thread 2 will do the same then thread 1 & 2 will call the function to get a unique ID function get_id(bool choice/*register thread or get id*/, pid_t pid) { static int pid[15][1]={0};//not sure if this work, anyway considor any it's been set to 0 by any other way than this static int total_threads = 0; static int i = 0; int x=0,y=0; if (choice) // thread registeration part { for(x=0;x<15;x++) { if (pid[x][0]==0); { pid[x][0] = (int) pid; pid[x][1] = (x & pidx[x][1]) << 24;//initiate counter for this PID by shifting x to the 25th bit, it could be any other bit, it's just to set a range. //so the range will be between 0x0000000 and 0x0ffffff, the second one will be 0x1000000 and 0x1ffffff, break; } total_threads++; } } //search if pid exist or not, if yes return transaction id for(x=0;x<15;x++) { if (pid[x][0]==pid); { pid[x][1]++;//put some test here to reset the number to 0 if it reaches 0x0ffffff return pid[x][1]; break; } } }

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  • Unauthorized access error to html pages in IIS 7.0

    - by George2
    I am using VSTS 2008 + C# + .Net 3.5 + IIS 7.0. I have created a new web site and put an html file into the directory. And when I use browse function in IIS manager to browse the html file, I met with the following error, any ideas what is wrong? BTW: I am very confused about unauthorized error since I run the worker process under administrator account. From the error message, I am confused why the logon method is anonymous and not using administrator account? HTTP Error 401.3 - Unauthorized You do not have permission to view this directory or page because of the access control list (ACL) configuration or encryption settings for this resource on the Web server. Module IIS Web Core Notification AuthenticateRequest Handler StaticFile Error Code 0x80070005 Requested URL http://localhost:80/a.html Physical Path C:\test\simplehosttest\a.html Logon Method Anonymous Logon User Anonymous thanks in advance, George

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  • I can't see wordpress .php file?

    - by Alegro
    I installed WAMP server on win xp - it works. I installed Wordpress 3.4.2 into www.wordpress - no problem. In Dreamweaver CS5 I created a site with www.wordpress as root folder, and assigned a local test server - ok. In Dreamweaver, I opened twentyten theme - index.php - and pressed F12 to see the page in Firefox - and got: Fatal error: Call to undefined function get_header()... - on line 16 This is a completely new and clear wordpress installation. Why is the function (get_header) - undefined? To check the server I copied another .php file into the same folder - F12 - it works.

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  • Connecting SQL 2005 to Oracle 10g

    - by Lorn
    Environment: - Oracle 10g database over a windows 32bit 2003 server - SQL 2005 database over a windows 32 bit 2003 server. I am trying to connect the above databases through heterogeneous services. I have updated the following files: TNSNames.ora, Listener.ora and hs.ora. When performing a test connection from SQL developer, I get the following error - ORA 28500 - indicating that the login for SA user is incorrect. I also tried using another authenticated user that has rights to the database. I can successfully connect with SQL 2000. Has anyone experienced such a problem before?

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  • Bug: unable to handle kernel NULL pointer dereference at

    - by maria
    I have recently installed new system on my disc, Ubuntu 12.04. Installation proceeded without problems, I started installing additional software and put data from other discs. I had already two times bug report, it was quite long, and I have no idea how to acces to log file (which probably is somewhere saved) and since I had to switch off the computer using the button, anything else was possible, here is just a small part of it (what I've noted on paper) could not write bytes: Broken pipe speach dicpatcher disabled: edit etc/default/speach-dispatcher saned disabled: edit .... and than: BUG: unable to handle kernel NULL pointer dereference at 0000009c I've run Memory test in GRUB, everything is fine. First time it occured when I was using rsync, second time when I was trying to install texlive. Should I install whole system once again? Or can it be hardware problem? Or something else? If there is any hardware details which may be relevant, please ask, since I have no idea what is happening, I don't know what kind of information could be useful. Thanks P.S. dmesg output:

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  • A Myriad of Options

    - by Mark Hesse
    I am currently working with a customer that is close to outgrowing their Exadata X2-2 half rack in both compute and storage capacity.  The platform is used for one of their larger data warehouse applications and the move to Exadata almost two years ago has been a resounding success, forcing them to grow the platform sooner than anticipated. At a recent planning meeting, we started looking at the options for expansion and have developed five alternatives, all of which meet or exceed their growth requirements, yet have different pros and cons in terms of the impact to their production and test environments. The options include an in-rack upgrade to a full rack of Exadata using the recently released X3-2 platform (an option that even applies to an older V2 rack), multi-rack cabling the existing X2-2 to another full rack or half rack X2-2 (and utilizing both compute and storage capacity in the other rack), or simply adding a new X3-2 half rack (and taking advantage of the added compute and flash performance in the X3-2). While the decision is yet to be made, it had me thinking that one of the benefits of Exadata over a traditional database deployment is that when the time comes to expand the platform, there are a myriad of options.

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  • Postfix - searching emails (logstash, greylog or other solution)

    - by Yarik Dot
    We are currently having ~100 servers and all of them are using remote syslog, so we have aggregated all logs on one server. The most questioned problem from our support team is: Has an email from .... to ... been delivered? I'd like to give to our support team access to some logging tool and some guide for searching in logs. What would you have recommended me? Or, do you know any other alternatives to test? The problem of grepping logs is that there is not sender and recipient address on one line. So I supposed, there might by some aggregation by email id.

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  • How to use lists in equivalence partitioning?

    - by KhDonen
    I have read that equivalence partitioning can be used typically for intervals or lists, e.g. I assume it can be used for every set of inputs. Anyway if the requirement says that allowed colors are (RED,BLUE,BLACK, GREEN), I cannot treat them like a list, right? I mean, testing one of them would not be enough because developers most likely used some switch-case and thus it is not real "set" where one could represent also the others. So how it is meant with lists? Also what is not that clear to me, I do not think it is always possible to do the initial partioning and then design the test cases. What about checking two lines intersection: Y=MX+C. (two inputs) 1) The lines are paraller. M1=M1 but C1 must be different from C2. 2) Lines are intersecting. M1 must be different from M2. 3) Coincident. The are the same. How can I use partitioning here? THis is actually taken from a book and it says that these sets are eq.classes.

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  • How do I remotely run a Powershell workflow that uses a custom module?

    - by drawsmcgraw
    I have a custom Powershell module that I wrote for various tasks. Now I want to craft a workflow whose activities will use commands from the module. Here's my test workflow: workflow New-TestWorkflow{ InlineScript { Import-Module custom.ps1 New-CommandFromTheModule } } Then I run the workflow with: New-TestWorkflow -PSComputerName remoteComputer When I do this, the import fails because it can't find the module. I imagine this is because the workflow is executing on the remote machine, where my module does not exist. I can see myself running this across many machines so I'd really rather not have to install this module and maintain it on all of the machines. Is there some way to have my module in a central place and use it in workflows?

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  • Oracle EZConnect in Mediawiki

    - by raindog308
    Mediawiki supports Oracle and I'm trying to configure it in the installer. The installers says you can use EZConnect...something like: user/pass@//server.example.com/dbname or since the installer has fields elsewhere for user/pass server.example.com/dbname The installer includes a link to the EZConnect docs: http://docs.oracle.com/cd/E11882_01/network.112/e10836/naming.htm. All the examples in that doc include a forward slash. But every combination I've tried results in an error like this: Invalid database TNS "sever.example.com/service_name". Use only ASCII letters (a-z, A-Z), numbers (0-9), underscores (_) and dots (.). I can't find any examples of EZConnect that don't include a forward slash. That error is from Mediawiki, not Oracle. I'm tailing the listener log and there is no connection made - Medaiwiki is returning an error without trying to connect. I'm using php OCI8 with the Oracle instant client. I don't have a tnsnames.ora setup for this client - which is kind of the point of EZConnect. I did write a test php script that connects via oci_connect just fine. Has anyone configured Mediawiki to use Oracle with EZConnect? If so, what did you use in the installer?

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  • HDA NVidia (GT520) - Sound Issue

    - by Oliver Lucas
    I have an GT520 graphics card and I am trying to get the sound working with my XBMC setup and I'm having trouble. Things I have completed: aplay -l List of PLAYBACK Hardware Devices card 0: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 then lspci 01:00.1 Audio device: nVidia Corporation HDMI Audio stub (rev a1) and alsamixer which is set to unmuted Everything looks well, so ran: aplay -D hw:0,3 /home/ollie/Music/alex.mp3 Playing raw data '/home/ollie/Music/alex.mp3' : Unsigned 8 bit, Rate 8000 Hz, Mono aplay: set_params:1059: Sample format non available Available formats: - S16_LE - S32_LE with no luck.. then speaker-test Playback device is default Stream parameters are 48000Hz, S16_LE, 1 channels Using 16 octaves of pink noise Playback open error: -2,No such file or directory also tried running through ftp://download.nvidia.com/XFree86/gpu-hdmi-audio-document/gpu-hdmi-audio.html#upgrading_alsa_driver and http://wiki.xbmc.org/index.php?title=HOW-TO:Setup_audio_over_HDMI_on_nVidia_GeForce/nForce_controller plus 20 other websites with selective "fixes" etc.. but no luck _< I am a complete beginner with Ubuntu so this is a really steep learning curve for me, not sure I'm learning much though as its all just headaches atm! Thanks for any help Ollie

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  • Linux PHP web server horribly slow when accessed from any windows browser

    - by Ed Harcourt
    I have a Linux server (Ubuntu 10.04) running apache2 and PHP. Everything runs fine when accessing a page from any browser from another Linux machine or Mac. But when I try to access a page from any combination of Windows machine and browser I get about a 30 second delay before the page comes back. Accessing a plain old HTML file from the Windows browser runs lickity split. So it seems to be just PHP. MySQL is installed but a simple test page that uses no MySQL is still slow. I don't think it is DNS because if I hard code the IP address in the URL nothing changes. There doesn't seem to be anything in the log files that I can tell. What could be causing this behavior on Windows clients?

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  • Fast, accurate 2d collision

    - by Neophyte
    I'm working on a 2d topdown shooter, and now need to go beyond my basic rectangle bounding box collision system. I have large levels with many different sprites, all of which are different shapes and sizes. The textures for the sprites are all square png files with transparent backgrounds, so I also need a way to only have a collision when the player walks into the coloured part of the texture, and not the transparent background. I plan to handle collision as follows: Check if any sprites are in range of the player Do a rect bounding box collision test Do an accurate collision (Where I need help) I don't mind advanced techniques, as I want to get this right with all my requirements in mind, but I'm not sure how to approach this. What techniques or even libraries to try. I know that I will probably need to create and store some kind of shape that accurately represents each sprite minus the transparent background. I've read that per pixel is slow, so given my large levels and number of objects I don't think that would be suitable. I've also looked at Box2d, but haven't been able to find much documentation, or any examples of how to get it up and running with SFML.

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  • aireplay - reading but not sending

    - by oneat
    I'm trying aircrack injection, everything is working I authenticated, but aireplay is not working aireplay-ng -3 -b 00:12:2A:01:74:05 -h 78:e4:00:87:71:8b mon0 18:53:03 Waiting for beacon frame (BSSID: 00:12:2A:01:74:05) on channel 7 Saving ARP requests in replay_arp-0817-185303.cap You should also start airodump-ng to capture replies. Read 4988 packets (0 ARPs, 4 ACKs), sent 0 packets...(0 pps) Why isn't it working? Why isn't it sending packets? 03:00.0 Network controller: Atheros Communications Inc. AR928X Wireless Network Adapter (PCI-Express) (rev 01) I tested injection on injection test in aircrack tutorial, despite driver wasn't patched.

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  • sql server express

    - by neil
    I use MS Acess as the front end. Loaded SQL Server 2008 R2 on my laptop. On my laptop (which I want to run the sql/access locally), there is no drop down listing. Under my normal Network (Sql 2000 enterprise edition) condition, the server name is part of the drop down listing. Finally got an ODBC positive test by manually listing in the system dns ODBC connection 'computername\sqlexpress'. Nonetheless, can not get an ODBC connection from Access. How can I get it working?

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  • Co-worker renamed all of my queries

    - by anon
    I don't know if I should be very irritated or what. I single handedly built over 300 queries for a large database, and developed a naming convention so I could find them later. No one else in my office even knows how to build a query, but I came in yesterday to find that all of them had been renamed. I am now having a very hard time finding things, and I am trying to figure out what to do. I spoke with the person responsible, and she just downplayed the whole thing. She said she renamed them so she can find them more easily. Unfortunately, I am the only one who knows how to build, edit, and maintain them, and the only reason she needed to find them was to test the queries. The new naming convention doesn't make sense at all, and I feel like we have taken a backwards step in the development process. What I'm trying to figure out is: 1) Am I overreacting? 2) What is the best way to handle this? I hate to mention this to my boss, but after speaking with my co-worker yesterday, I can already tell she feels like she did nothing wrong.

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