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  • Is a ext3 Linux filesystem byte order independent

    - by Lothar
    I have a good old HP-C3700 Workstation with PA-RISC CPU here that I would like to use as a subversion server for a very large repository. I just worry what happens if the workstation dies (everybody who knows this computer knows that it is running like an Abrams tank and unlikely to happen in the next decade). I'm using Debian Linux on this system. If the mainboard dies can I just plug the SCSI drive into a PC and read the files from a normal Intel Linux PC? Which software RAID levels would be safe?

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  • Is it possible to restrict fileserver access to domain users using computers that are members of the domain?

    - by Chris Madden
    It seems domain isolation can be used to accomplish, but I'd like a solution that doesn't require IPsec, or more accurately, doesn't require IPsec on the fileserver. IPsec if done in software has a large CPU overhead and our NAS boxes don't support any kind of offload. The goal is to avoid authenticated users using non-managed machines to access network resources. Network Access Protection (NAP) and the various enforcement points looked promsiing but I couldn't find a bulletproof way to use them [which doesn't require IPsec on the fileserver]. I was thinking when a domain user accesses the NAS box it will first need a Kerberos ticket from AD, so if AD could somehow verify the computer that was requesting the ticket was in the domain I'd have a solution.

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  • How to play games in widescreen in Windows 7, Dell Studio 1555

    - by blasteralfred
    I have a dell studio 1555 laptop with a GPU inside. The details are below; Hardware details Software details I can play games in widescreen in Vista, but not in 7. I am using Windows 7 Home Premium. I have the latest Catalyst Control Center. Instead of widescreen, the games are running in a classic style, say 1024x768 ratio. When I play need for speed underground, the maximum possible resolution is 1024x768 (all other games are like this). I have no problem with HD videos and anything else. How can I fix this? Thanks in advance...:)

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  • Is DevCon.exe still the best way to restart/power cycle USB ports after resuming from hibernation in

    - by ProfessionalAmateur
    I have a USB broadband card on my Windows 7 laptop. It loathes resuming from hibernation properly. Back in the XP days I would issue a call devcon.exe from the command prompt and restart the selected ports (Saves you having to manually unplug and plug back in your USB devices). Ive been trying this is Windows 7, but the UAC keeps getting in the way. I'll start a command prompt. Issue the devcon command, but UAC asks me if I really want to do this, when I click yes it opens a different command prompt and launches the command. After the command completed this new prompt window closes faster than the speed of light and I cannot see the results. So Im thinking there has to be a better way to do this in the Vista/Win7 world...?

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  • Linux USB/Serial port won't create a tty device in /dev

    - by Dave
    I am connecting a USB to serial driver port to my system and I get about halfway to where I need to go. When it is plugged in dmesg indicates: <6>usb 2-1: new full speed USB device using sl811-hcd and address 4 <6>usb 2-1: configuration #1 chosen from 1 choice and lsusb Bus 2 Device 4: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port Bus 2 Device 1: ID 0000:0000 Bus 1 Device 1: ID 0000:0000 I get a series of usbdev2.4 (usbdev2.4, usbdev2.4_ep00, etc) devices in dev but no ttyUSB0 or anything that I can open with minicom. How do I get the system to create the /dev device? Thanks Dave

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  • Performance problems on RDC to our Terminal-Server Win2008 R2

    - by user40021
    Hello, we have a new win2008-R2 (2x Xeon X5570, 32GB RAM). There I have installed the terminal-server roles, thats all OK. Currently 5 users are working at this server, but all get a very low performance in their remote-desktop session. Sometime it takes 1-2 seconds till the keyboard-inputs will be performed and shown. At the clients I run RDP v 6.1 We have also an older TS-server (based on Win2003 with an Opteron-CPU), there are working about 20 users at the same time. There I do not have the troubles with the inputs at the remote-desktop sessions. Both servers are connected to the same gigabit-switch. Any ideas what could cause the troubles at the Win2008 R2? Many thanks in advance. Regards Chris

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  • Live wallpaper settings not applying

    - by Steve
    I have added settings to my live wallpaper but they are not being applied when changed. I would greatly appreciate it if someone could tell me why my settings are not being applied when changed. Here is my code: settings.xml <PreferenceCategory android:title="@string/more"> <PreferenceScreen android:title="@string/more"> <intent android:action="android.intent.action.VIEW" android:data="market://search?q=pub:PSP Demo Center" /> </PreferenceScreen> <ListPreference android:persistent="true" android:enabled="true" android:entries="@array/settings_light_number_options" android:title="@string/settings_light_number" android:key="light_power" android:summary="@string/settings_light_number_summary" android:defaultValue="3" android:entryValues="@array/settings_light_number_optionvalues" /> <ListPreference android:persistent="true" android:enabled="false" android:entries="@array/settings_speed_number_options" android:title="@string/settings_speed_number" android:key="speed" android:summary="@string/settings_speed_number_summary" android:defaultValue="10" android:entryValues="@array/settings_speed_number_optionvalues" /> <ListPreference android:persistent="true" android:enabled="false" android:entries="@array/settings_rotate_number_options" android:title="@string/settings_rotate_number" android:key="rotate" android:summary="@string/settings_rotate_number_summary" android:defaultValue="8000" android:entryValues="@array/settings_rotate_number_optionvalues" /> </PreferenceCategory> </PreferenceScreen> Settings.java public class GraffitiLWPSettings extends PreferenceActivity implements SharedPreferences .OnSharedPreferenceChangeListener { public static final String SHARED_PREFS_NAME = "wallpaper_settings"; protected void onCreate(Bundle icicle) { super.onCreate(icicle); getPreferenceManager(). setSharedPreferencesName(GraffitiLWP.SHARED_PREFS_NAME); addPreferencesFromResource(R.xml.settings); getPreferenceManager().getSharedPreferences(). registerOnSharedPreferenceChangeListener(this); } protected void onResume() { super.onResume(); } protected void onDestroy() { getPreferenceManager().getSharedPreferences() .unregisterOnSharedPreferenceChangeListener(this); super.onDestroy(); } public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { } } wallpaper.java public class GraffitiLWP extends Wallpaper { private GraffitiLWPRenderer mRenderer; public static final String SHARED_PREFS_NAME = "wallpaper_settings"; public Engine onCreateEngine() { mRenderer = new GraffitiLWPRenderer(this); return new WallpaperEngine( this.getSharedPreferences(SHARED_PREFS_NAME, Context.MODE_PRIVATE), getBaseContext(), mRenderer); } } renderer.java public class GraffitiLWPRenderer extends RajawaliRenderer { private Animation3D mAnim; private BaseObject3D mCan; private SettingsUpdater settingsUpdater; //private SharedPreferences preferences; public GraffitiLWPRenderer(Context context) { super(context); setFrameRate(20); } public class SettingsUpdater implements SharedPreferences .OnSharedPreferenceChangeListener { private GraffitiLWPRenderer renderer; public SettingsUpdater(GraffitiLWPRenderer renderer) { this.renderer = renderer; } public void onSharedPreferenceChanged( SharedPreferences sharedPreferences, String key) { preferences.getInt("wallpaper_settings", 0); renderer.setSharedPreferences(preferences); } } public void initScene() { System.gc(); ALight light = new DirectionalLight(); light.setPower(this.preferences.getLong("light_power", 3)); light.setPosition(0, 0, -10); mCamera.setPosition(0, -1, -7); mCamera.setLookAt(0, 2, 0); mCamera.setFarPlane(1000); ObjParser parser = new ObjParser(mContext .getResources(), mTextureManager, R.raw.spraycan_obj); parser.parse(); mCan = parser.getParsedObject(); mCan.addLight(light); mCan.setScale(1.2f); addChild(mCan); Number3D axis = new Number3D(0, this.preferences.getLong("speed", 10), 0); axis.normalize(); mAnim = new RotateAnimation3D(axis, 360); mAnim.setDuration(this.preferences.getLong("rotate", 8000)); mAnim.setRepeatCount(Animation3D.INFINITE); mAnim.setInterpolator(new AccelerateDecelerateInterpolator()); mAnim.setTransformable3D(mCan); setSkybox(R.drawable.posz, R.drawable.posx, R.drawable.negz, R.drawable.negx, R.drawable.posy, R.drawable.negy); } public void onSurfaceCreated(GL10 gl, EGLConfig config) { settingsUpdater = new SettingsUpdater(this); this.preferences.registerOnSharedPreferenceChangeListener( settingsUpdater); settingsUpdater.onSharedPreferenceChanged(preferences, null); super.onSurfaceCreated(gl, config); mAnim.start(); } public void onDrawFrame(GL10 glUnused) { super.onDrawFrame(glUnused); mSkybox.setRotY(mSkybox.getRotY() + .5f); } } I know the code is long but I would greatly appreciate any help that someone could give me. Thank you.

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  • smallest footprint for Web Application server?

    - by edgardodelamanta
    There are times when you need to spare hardware resources (either to keep using legacy hardware, to play the embedded card, or just to be efficient because a large footprint is trashing CPU caches, leading to unacceptable levels of idle-states). In this spirit, some efforts have been made to make 'light' ports of Java or Mono (C# for Linux), and they range in the 80-50 MB (instead of the 100-200 MB). Add a Web server (Apache, IIS, etc.) to the scripting engine and you can happily dive into the GB (IIS + .Net) only to load the tool in memory. Anybody with more modest tools in the specs area?

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  • Why do I have to manually 'Restart Management Network' on vSphere 5 host after reboot to get networking available?

    - by growse
    I've got a couple of vSphere 5.0 hosts in a small lab environment here and I've noticed a strange behaviour. When on of the hosts gets rebooted, it is unresponsive to the network until I log into the ESX console, Press F2 to customize and select Restart management network. Once this is done, the networking works perfectly as expected. Each host has two NICs which are trunked together using Etherchannel to a Cisco 3750. The link is also a .1q VLAN trunk and the management network is configured on VLAN121 with the VM traffic configured on VLAN118. Why would the host be completely dead to the world until I physically kick it? Edit Sample switch config for trunk: interface Port-channel2 description Blade 1 EtherChannel Trunk switchport trunk encapsulation dot1q switchport mode trunk end ! ! interface GigabitEthernet4/0/1 description Bladecenter1 CPM 1A switchport trunk encapsulation dot1q switchport mode trunk speed 1000 duplex full channel-group 2 mode on end Vswitch teaming settings: Management port group settings:

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  • Changes to talk/ytalk or alternative chat in the Linux terminal

    - by cascaval
    While looking for a piece of software that provides chat between 2 Linux server users logged in the terminal, I tried talk/ytalk. Unfortuntaley it provides chat between users on separate walls (each user has its own wall) and the messages lack timestamps. Is it possible to set it up so that at least timestamps are provided? Alternatively, is there any other software that could provide one wall on which users write messages prepended with time? Simple chat with messages listed in the order of submission would be ideal: 13:05:48 [bridgekeeper@...]: What is the air-speed velocity of an unladen swallow? 13:06:28 [cascaval@...]: What do you mean? An African or European swallow? I already tried wall and write but they don't fit the bill. OS: Debian 6.0

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  • Patriot-2 RAM on ASUS PK5-E not running at PC2-8500?

    - by evan
    I have a P5K-E Motherboard and recently upgraded to 8GB of RAM (4 2GB sticks of PC2-8500 1066 MHz - Patriot Viper 2). When looking at the RAM with PC Wizard 2010 it's showing the RAM being recognized PC2-6500. I've read elsewhere that this is a common problem and requires manually changing the DRAM Voltage in BIOS to 2.2. I've done this and I'm still getting it recognized as PC2-6500. (I also manually set the FSB speed to 1066MHz instead of the AUTO). Any ideas on how to get this memory working properly? Thanks in advance!

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  • Calculating IOPS for a single HDD - what am I doing wrong?

    - by red888
    So I know there is no standardized way of calculating IOPS for a HDD, but from everything I have read it appears one of the most accurate formulas is the following: IOP/ms = + {rotational latency} + ({block size} / {data transfer rate}) Which is IOs per millisecond or what the book I've been reading calls "Disk Service Time". Also rotational latency is calculated as half of one rotation in milliseconds. This was taken from the EMC book "Information Storage and Management" -arguably a pretty reliable source right\wrong? Putting this formula into practice consider this Seagate data sheet. I am going to calculate IOPS for the ST3000DM001 model for a block size of 4kb: Seek Average (Write) = 9.5 -I'll measuring IOPS for writes Spindle speed = 7200rpm Average Data Rate = 156MB/s So my variables are: Seek Time = 9.5ms Rotational latency = (.5 / (7200rpm / 60)) = 0.004s = 4ms Data Rate = 156MB/s = (0.156MB/ms / 0.004MB) = 39 9.5ms + 4ms + 39 = IO/ms 52.5 1 / (52.5 * 0.001) = 19 IOPS 19 IOPS for this drive clearly is not right so what am I doing wrong?

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  • problem with intel 82865 motherboard graphic driver in windows 7

    - by Sanjay Kumar Yadav
    I have cpu with Pentium 4 3GHz processor. My motherboard is Intel 82865. I have installed the graphic driver for intel 82865 by using the graphic driver of Windows XP and changing the program's compatibility to Windows XP SP2. I got many thing ok with that. For example many resolutions and I can also play GTA. But what I want to know is why I cant view Aero and transparency effect in windows 7. It says contact the manufacturer for compbatible WDDM graphic driver.

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  • Open a screen session inside a certain user on boot Ubuntu Server Linux

    - by Pez Cuckow
    I currently have a private server which I test my web apps on which runs Ubuntu Server 10.04 I also host a few game servers (rather than having wasted CPU time :-D) for some of my friends. These game servers I run in the game user account and each one has it's own screen session (so friends can ssh in and reboot the game server etc...). For example screen -R l4d2 runs ./start in the L4D2 folder. However if I reboot the server (which I have to do occasionally) all these sessions close and I have to manually create all the screen sessions and run the required games within them. Is there a way to set these screen sessions as Daemons or services or just boot on server start so they restart themselves on server reboot? I hope I have made my question easy to understand but feel free to ask questions! Many thanks,

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  • Is there a test to see if hardware virtualization (vmx / svm) are presently enabled within a Linux session?

    - by Dr. Edward Morbius
    I'm writing procedures for configuring VirtualBox support for 64-bit SMP guests, which requires hardware virtualization suppot (VTx/Intel, AMD-V/AMD). I have successfully configured this myself, however I'd like the procedure to be clear. sed -ne '/^flags/s/^.*: //p' /proc/cpuinfo | egrep -q '(vmx|svm)' && echo Has hardware virt || echo No HW virt ... shows if the CPU is capable. I've still got to go enable the feature in BIOS. Any way to test from within Linux to see that this is no or not? Thanks. (Edit: s/xvm/svm/ in title)

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  • Is there a sensible way of 'teaming' two ADSL connections?

    - by Tim Long
    I work in an office complex that has two seperate ADSL connections, which they use to provide two seperate networks (actually both the ADSL routers go into a Cisco managed switch with two VLANs, one for each ADSL connection). Circumstances have changed so that 95% of the users are all on one ADSL connection. It would be great if there were a way to join together both connections to emulate a single connection at double the speed, but the ISP doesn't support bonding. So, is there a sensible way to take two completely seperate ADSL lines and use them to provide a single internet gateway?

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  • What settings to use for fastest reloading of a MySQL backup?

    - by Alex R
    I have a MySQL database which dumps to a 3.5 GB backup (mysqldump) in about 10 minutes. But reloading this backup on a standby / test server takes upwards of 12 hours. What are some settings that would maximize reloading performance? The most promising appear to be innodb_buffer_pool_size, innodb_additional_mem_pool_size, and innodb_log_buffer_size... but I'm reaching the limits of my trial-and-error approach. Which of these settings "should" be the most important? Through trial-and-error I was not able to get more than 70% CPU utilization and 63% memory utilization. I'd like both at 100% during a reload. All tables are InnoDB.

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  • Re-Calibrate Toshiba battery meter with Windows 7

    - by Farseeker
    Hi All. I have a Toshiba U300 laptop. Back in the olden days (circa-2000) you could re-calibrate the battery meter from the BIOS when your battery was no longer reading accurately. My battery was shot, so I bought a brand new one, however Windows 7 still seems to count down the battery life in at the same speed as the old one did. This time, when it alleged 0%, I turned the laptop back on and got another 90 minutes of life out of it, at 0%. Is there a tool or utility for Toshiba laptops that can fix it back to being accurate? I've read the other threads on SU about cycling the battery but that just doesn't seem to do it in this case. Update: After the last cycle, the battery meter now reads 100% but the indicator on the front of the laptop is still orange (indicating not fully charged)

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  • How Can I Improve/SpeedUp This FrequentFunction in C?

    - by Peter Lee
    Hi folks, How can I improve / speed up this frequent function? #include <math.h> #include <stdio.h> #include <stdlib.h> #include <time.h> // Assumptions: x, y, z, a, b and c are all array of 10. // Requirement: return the value of ret; // get all elements of array c float fnFrequentFunction(const float* x, const float* y, const float* z, const float *a, const float *b, float *c, int M) { register float tmp; register float sum; register float ret = 0; int i; for (i = 0; i < M; i++) // M == 1, 2, 4, or 8 { sum = 0; tmp = x[0] - y[0]; sum += tmp * tmp * z[0]; tmp = x[1] - y[1]; sum += tmp * tmp * z[1]; tmp = x[2] - y[2]; sum += tmp * tmp * z[2]; tmp = x[3] - y[3]; sum += tmp * tmp * z[3]; tmp = x[4] - y[4]; sum += tmp * tmp * z[4]; tmp = x[5] - y[5]; sum += tmp * tmp * z[5]; tmp = x[6] - y[6]; sum += tmp * tmp * z[6]; tmp = x[7] - y[7]; sum += tmp * tmp * z[7]; tmp = x[8] - y[8]; sum += tmp * tmp * z[8]; tmp = x[9] - y[9]; sum += tmp * tmp * z[9]; ret += (c[i] = log(a[i] * b[i]) + sum); } return ret; } int main() { float x[10] = {0.001251f, 0.563585f, 0.193304f, 0.808741f, 0.585009f, 0.479873f, 0.350291f, 0.895962f, 0.622840f, 0.746605f}; float y[10] = {0.864406f, 0.709006f, 0.091433f, 0.995727f, 0.227180f, 0.902585f, 0.659047f, 0.865627f, 0.846767f, 0.514359f}; float z[10] = {0.866817f, 0.581347f, 0.175542f, 0.620197f, 0.781823f, 0.778588f, 0.938688f, 0.721610f, 0.940214f, 0.811353f}; float a[10] = {0.870205f, 0.733879f, 0.711386f, 0.588244f, 0.484176f, 0.852962f, 0.168126f, 0.684286f, 0.072573f, 0.632160f}; float b[10] = {0.871487f, 0.998108f, 0.798608f, 0.134831f, 0.576281f, 0.410779f, 0.402936f, 0.522935f, 0.623218f, 0.193030f}; float c[8]; int i; int n = 10000000; long start; // Speed test here: start = clock(); while(--n) fnFrequentFunction(x, y, z, a, b, c, 8); printf("Time used: %ld\n", clock() - start); printf("fnFrequentFunction == %f\n", fnFrequentFunction(x, y, z, a, b, c, 8)); for(i = 0; i < 8; ++i) printf(" c[%d] == %f\n", i, c[i]); printf("\n"); return 0; } Any suggestions are welcome :-)

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  • Rail's FileStore with Linux Disk Caching or RAMdisk?

    - by Yo Ludke
    I have a Ruby on Rails application that stores it's catched files on the filesystem (Rails file-system cache). I was thinking about changing to memcached Store, but a short test shows it isn't a big difference in speed. From linuxatemyram.com I learned a bit about file caching. On the current machine there would be around 40..45GB RAM left which isn't needed for the application and which can be used to linux-disk-cache this rails file cache store. The disk is a RAID10 system with almost 120MB disk perfomance. How can I tell Linux to use free RAM more deliberately and not to be shy about using it? Do think it's necessary to adjust a sysyctl/.. value here, or would I have performance advantages to put the File Store root diretory on a ramdisk? (Loosing the cache during a reboot wouldn't be a problem)

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  • MBP becomes very hot after using Xcode

    - by Globalhawk
    Hardware: MBP early 2011 version OS: Mountain lion App: Xcode 4.5.2 Problem: Every time when I start Xcode, 2 or 3 processes called "git" start running. But when I quit Xcode the "git" process won't quit and are still using a lot of CPU. Then the computer becomes quite hot and the battery gets drained very quickly. If I manually kill these processes the problem is gone. I tried to reinstall Xcode several times but the problem comes back every time. It drives me crazy. Any help will be appreciated!

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  • How do UEFI and virtual machines relate to each other?

    - by Iterator
    I am trying to get my head around UEFI (Unified Extensible Firmware Interface) and it's not entirely clear to me how this affects virtual machines. Thus, there are three parts to this question: Is UEFI an advance in hardware support for virtualization? All other things being equal, would a machine with UEFI be more likely to run a virtual machine more efficiently than one without, or does UEFI cause any performance hits that negate any speed improvements from a virtual machine? Would the difference in execution be visible to code running in a virtual machine? (In theory, it shouldn't, but in practice?)

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  • Is it possible to modify a color scheme and windows decorations in Xfce4?

    - by Juhele
    just testing PCLinuxOS Phoenix XFCE Edition 2011-07 which I would like to install on my grandpa's PC instead older PCLOS 2009 with KDE3 (which is almost impossible to upgrade). The PC is relatively older one (Sempron 2200+ CPU, MSI K7N2GM2 board with integrated GeForce 440MX series graphics, 1GB RAM and 80GB IDE HDD) and I thought that it is too weak for KDE4. I already used Xfce in the past (Sam Linux 2006 and 2007), but in new Xfce4 I am not able to somehow change the windows color scheme and the windows decorations - the settings manager offers me switching between preinstalled themes but it is possible to modify them with some GUI?

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  • How to sum cells depending on the content of a neighbor cell

    - by dannymcc
    I have an Excel document with the following columns; Date | Reference | Amount 23/01/11 | 111111111 | £20.00 25/09/11 | 222222222 | £30.00 11/11/11 | 111111111 | £40.00 01/04/11 | 333333333 | £10.00 31/03/11 | 333333333 | £33.00 20/03/11 | 111111111 | £667.00 21/11/11 | 222222222 | £564.00 I am trying to find a way of summarising the content in the following way; Reference : 111111111 Total: £727 So far the only way I have been able to achieve this is to filter the list by each reference number (manually) and then add a simple SUM formula to the bottom of the list of amounts. Are there any tricks that anyone knows that may speed this up? What I am trying to achieve is a spreadsheet that highlights each reference number that collectively exceeds over £2,000.

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  • Optimum number of threads while multitasking

    - by Gun Deniz
    I know similar questions have been asked but I think my case is a little bit diffrent. Let's say I have a computer with 8 cores and infinite memory with a Linux OS. I have a calculation software called Gaussian that can take advantage of multithreading. So I set its thread count to 8 for a single calculation for maximum speed. However I really can't decide what to do when I need to do run for instance 8 calculations simultaneously. In that case should I set the thread count to 1(total 8 threads spawned in 8 processes) or keep it 8(total 64 threads spawned in 8 processes) for each job? Does it really matter much? A related question is does the OS automatically does the core-parking to diffrent cores for each thread?

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