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  • E: unable to locate package firmware-b43-installer when i

    - by Raju
    I am using Acer aspire-5002wlmi laptop and set up a dual boot with Windows XP and Ubuntu 12.04. Wifi is well working in XP but when I start Ubuntu I will get the below error. [ 95.514855] b43-phy0 ERROR: You must go to http://wireless.kernel.org/en/users/Drivers/b43#devicefirmware and download the correct firmware for this driver version. Please carefully read all the instruction on this website. then I followed the instructions from the below link file:///C:/Documents%20and%20Settings/MGL/Desktop/how%20to%20install%20ubuntu/Ubuntu%2012.04%20Splash%20Screen%20Lockup%20with%20LiveCD%20_%20Ben%20Rousch%27s%20Cluster%20of%20Bleep.htm but I am stuck in installing the Broadcom Wifi firmware in terminal and it is showing this error: E: unable to locate package firmware-b43-installer

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  • Upgraded to 11.10 lost personal folders, Ubuntu one shows no files

    - by Kevin
    Upgraded to 11.04, from 10.10 system would only come up in terminal mode, but it told me that an additional upgrade was available and did I want to do that. Foolishly thinking that might fix the problem, I said yes. This time it did not make it all the way through the upgrade, when I came back to the computer over an hour later, the screen was filled with an error message "could not open display", had to reboot. Went to recovery mode on reboot to install nvidia module, when I rebooted system came up fine, but without carrying over my personal folders, I have the home folder, but no personal named folder in it. Came to Ubuntu One, but gives error message; File Sync error. (org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked Is the a way around this in order to restore my files? I know my files existed on Ubuntu one as of a few months ago.

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  • 12.04 boots fine, with graphical splash screen, but then Monitor "out of range"

    - by Jim Bednar
    I see dozens of posts from people whose monitors are saying "out of range" under Ubuntu; seems like there are some serious problems in Ubuntu with autodetection of monitor capabilities. :-( But none of the many, many suggestions I found have solved my problem, and right now I can't use anything graphical on this machine! History: I installed Ubuntu 12.04 on my HP Proliant Microserver N40L, which worked reasonably at the default resolution across several reboots. At some point I noticed that the proprietary video driver was not in use, and tried to install one to get better window-drawing speeds, but it failed with some sort of error, and I gave up on that. A few weeks later when I next rebooted, it showed the usual BIOS screen and various boot loading screens (including GRUB), and then the usual purple Ubuntu splash screen with the dots showing that things were loading, but when it finished booting the monitor went black and eventually showed "Out of range" (with no other information). Given that there were several weeks between reboots (it's a server, after all), I've no idea if it was some system update, trying to install the proprietary drivers, or something else that caused the problem. Anyway, the system has booted fine, as I can do Ctrl-Alt-F1 to get a text prompt and can log in there. But Ctrl-Alt-F7 goes back to the out of range error. Some posters said to try Ctrl-Alt-- (minus) to cycle through resolutions until one works, but that didn't have any visible effect. Many, many others said it was a grub problem, which seems unlikely given that grub's screen looks fine, but I tried editing /etc/default/grub to set a particular resolution (trying many of them) and running update-grub, with no apparent effect. Rebooting into failsafe mode works the same as regular mode. Replacing xorg.conf with xorg.conf.failsafe works the same too. I'm at my wits' end! Isn't there anything I can do to convince Ubuntu to choose a mode that the monitor supports? E.g. the one that it is using for the splash screen? I don't need great resolution on this machine, just anything that works!!!!! Help!!!!!! Please!!!!

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  • How much will cost to hire a developer who have to make a SEO software? [closed]

    - by Victor
    Hey guys, I know NOTHING about software developing but I got an amazing idea about a software. The thing is I want to know how much money I would approximately need to hire someone to do it for me. The software is gonna have a lot of features, everything is relative to SEO - link building with Web 2.0 sites, Blog comments, Video Submittion, Bookmarking, RSS, Ping Mode, Forum register and submittion, Proxy mode, ect. The point is to be all automated! I mean all profile creation is going to be automate! There are a lot of softwares but nothing is doing everything that I want. So I would like to build my own software, use it for on my own and of course I'll sell it too! So how much do you think I would need to be able to order such a software?

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  • Broken BURG install after backup/restore

    - by WindowsEscapist
    Long story short: BURG is stuck in text mode and I can't seem to get it back to the eye-candy. I have purged and then re-installed to no avail. I am running 12.04. The long story: I originally installed onto 12.04 using Super-boot-manager (BURG-manager) and then stopped using it in favour of GRUB because I had too many entries. I then had to backup and restore Ubuntu (partition was deleted and re-created) due to unrelated issues. I re-installed GRUB2 and booted into Ubuntu to re-install BURG, but after re-booting it appears to be stuck in text mode (looks exactly like GRUB 1). Any ideas? I know I'm not supposed to be using it on 12.04 (I think) but it worked before, so what's up?

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  • Monitoring C++ applications

    - by Scott A
    We're implementing a new centralized monitoring solution (Zenoss). Incorporating servers, networking, and Java programs is straightforward with SNMP and JMX. The question, however, is what are the best practices for monitoring and managing custom C++ applications in large, heterogenous (Solaris x86, RHEL Linux, Windows) environments? Possibilities I see are: Net SNMP Advantages single, central daemon on each server well-known standard easy integration into monitoring solutions we run Net SNMP daemons on our servers already Disadvantages: complex implementation (MIBs, Net SNMP library) new technology to introduce for the C++ developers rsyslog Advantages single, central daemon on each server well-known standard unknown integration into monitoring solutions (I know they can do alerts based on text, but how well would it work for sending telemetry like memory usage, queue depths, thread capacity, etc) simple implementation Disadvantages: possible integration issues somewhat new technology for C++ developers possible porting issues if we switch monitoring vendors probably involves coming up with an ad-hoc communication protocol (or using RFC5424 structured data; I don't know if Zenoss supports that without custom Zenpack coding) Embedded JMX (embed a JVM and use JNI) Advantages consistent management interface for both Java and C++ well-known standard easy integration into monitoring solutions somewhat simple implementation (we already do this today for other purposes) Disadvantages: complexity (JNI, thunking layer between native C++ and Java, basically writing the management code twice) possible stability problems requires a JVM in each process, using considerably more memory JMX is new technology for C++ developers each process has it's own JMX port (we run a lot of processes on each machine) Local JMX daemon, processes connect to it Advantages single, central daemon on each server consistent management interface for both Java and C++ well-known standard easy integration into monitoring solutions Disadvantages: complexity (basically writing the management code twice) need to find or write such a daemon need a protocol between the JMX daemon and the C++ process JMX is new technology for C++ developers CodeMesh JunC++ion Advantages consistent management interface for both Java and C++ well-known standard easy integration into monitoring solutions single, central daemon on each server when run in shared JVM mode somewhat simple implementation (requires code generation) Disadvantages: complexity (code generation, requires a GUI and several rounds of tweaking to produce the proxied code) possible JNI stability problems requires a JVM in each process, using considerably more memory (in embedded mode) Does not support Solaris x86 (deal breaker) Even if it did support Solaris x86, there are possible compiler compatibility issues (we use an odd combination of STLPort and Forte on Solaris each process has it's own JMX port when run in embedded mode (we run a lot of processes on each machine) possibly precludes a shared JMX server for non-C++ processes (?) Is there some reasonably standardized, simple solution I'm missing? Given no other reasonable solutions, which of these solutions is typically used for custom C++ programs? My gut feel is that Net SNMP is how people do this, but I'd like other's input and experience before I make a decision.

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  • Unable to connect to wireless network

    - by Mike
    A real newbie here. Just downloaded Ubuntu 12.10, put on USB stick and have booted it on my other PC after modifying the boot sequence to boot from USB before hard drive where Windows XP lives. Have no problems with Windows and my wireless but not with Ubuntu. The PC is a Dell Latitude D630 laptop. According to Windows XP , the wireless card is a Dell Wireless 1490 Dual Band WLAN Mini-Card, my IP address is 192.168.0.193, subnet mask is 255.255.255.0, assigned by DHCP, SSID is HOME , type 802.11 and default gateway is 192.168.0.1. Ok, back to booting from USB and TRY option, I am Editing Network connections, I have created/configured "Wireless connection 1" with SSID of HOME and the only other thing I have changed is on the "Editing IPV4 routes for Wireless connection 1 I have enterred 192.168.0.193 , netmask 255.255.255.0 and gateway 192.168.0.1 Anyways , no go. Could use some help. Thanks, Mike from Montreal

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  • Ops Center Update 2 is available!

    - by Owen Allen
    Oracle Enterprise Manager Ops Center Release 1, Update 2 (12.1.2.0.0) is available. This release includes support for Oracle Solaris 11.1 and Oracle Linux 6.3, the ability to attach a network multiple times to an LDom guest using the same vswitch, support for HMP 2.2.3, improved options for adding users from remote directory servers, and a few other useful features. A list of new features is in What's New. You can view the documentation online, or you can download a zip file of the library from the Overview tab. If you're running Ops Center in connected mode, the updates are delivered to the UI. If you are in disconnected mode or have not yet installed Ops Center, you can go to the Ops Center download page to get the latest release. Before installing or upgrading to Ops Center 12c Update 2, review the Release Notes for things to watch out for, then see the upgrade instructions in the Administration Guide.

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  • changed /etc permission in oneiric (ubuntu11.10) by using "sudo chmod 665 /etc" cant use sudo now

    - by GuruDevil
    i screwed up big time. i changed the permission of /etc in ubuntu 11.10 by using following command sudo chmod 665 /etc now when ever i try to use sudo it gives the following error: sudo: can't open /etc/sudoers: Permission denied sudo: no valid sudoers sources found, quitting any help will be greatly appreciated because i am new to ubuntu....i have already tried using su but it doesnt even login as root and even i give it the right password it always say Authentication Failure......i dont want to login as root coz its risky and even a newbie in linux like me is not stupid enough to have such control...i just want to use my sudo again......i have tried to go into recovery mode as well but i cant get in to recovery mode......HELP please!!!

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  • Why does pasting sometimes not work in gnome-terminal?

    - by Matthew
    Ctrl + Shift + C and Ctrl + Shift + V are supposed to replace the normal Ctrl + C and Ctrl + V in gnome-terminal. Sometimes they work, but usually they have no effect. What are some potential reasons for this? I'm not sure what other information to give. Edit: It seems that manually selecting Paste from the Edit menu does not work either. Right click > Paste works, but Edit > Paste does not. Copying works, but pasting does not. Also, I have vi-mode enabled (set -o vi in my ~/.bashrc). Could this have something to do with it? Edit: Here is a video demonstrating the problem. I used Screenkey (in "raw" mode, to catch "shift") to show what keys I am pressing.

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  • Game engine design: Multiplayer and listen servers

    - by jarx
    My game engine right now consists of a working singleplayer part. I'm now starting to think about how to do the multiplayer part. I have found out that many games actually don't have a real singleplayer mode, but when playing alone you are actually hosting a local server as well, and almost everything runs as if you were in multiplayer (except that the data packets can be passed over an alternate route for better performance) My engine would need major refactoring to adapt to this model. There would be three possible modes: Dedicated client, Dedicated server and Client-Server (listen mode) * How often is the listen-server model used in the gaming industry? * What are the (dis)advantages of it? * What other options do I have?

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  • Various issues linked to my CD drive, when it has a disc in it

    - by Voyagerfan5761
    When I go to the Desktop and click on a media icon (for my flash drive, a CD, whatever it is), the following problems occur, in this approximate sequence: Nautilus will close if it's open. the desktop icons disappear my Window List shows a button that says "Starting File Manager" the icons reappear the button in Window List disappears Because of this problem, I can no longer drag and drop media, nor can I right-click to perform actions such as "Eject" and "Safely Remove Drive". The same symptoms occur if I click a media icon (that is also present on the desktop) in Nautilus' Computer view, though notably not if I click in the places list on the left. I have confirmed that this problem happens only if there is a CD in the drive (Matshita UJDA360). Also, inserting a disc into the CD drive appears to kill all running programs and restart Nautilus (or X; I'm not sure). Applications like Brasero and Rhythmbox will not start while there is a disc in the drive. Removing the disc doesn't result in the list of media updating; it must be forced to update by clicking on one of the desktop icons and going through one of the above-described cycles. It doesn't seem to matter what type of disc is in the drive. This has happened with CD-RWs I burned years ago using Roxio on Windows XP, the Ubuntu disc I installed from (burned with InfraRecorder Portable under Windows XP), and the retail game disc for Star Trek Armada II. The first indication of a problem was Brasero dying when I tried to insert a disc for erasure and rewriting. Since then, I've drafted several different questions on various issues, finally combining them into this one when I realized that having a CD in the drive was the common link. Could this be a simple driver issue? If Ubuntu is dynamically detecting my hardware on boot, can I specify drivers for devices that I know will be a problem if the default files are used? I'm beginning to think that my laptop, an old Dell Inspiron 2650, is just too old or proprietary-driver-hungry (or something, maybe RAM-starved) for Ubuntu and Windows XP to play nicely alongside each other. Or maybe I just need to carefully take my wall-wart machine to a coffee shop for an afternoon so I can download updates and such from the Internet, as I lack a home connection.

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  • Top 10 Vulnerabilidades de Seguridad en el WEB.CONFIG- PARTE 1

    - by Jason Ulloa
    Durante estos post, mostraré los 10 problemas o errores de configuración en el web.config que provocan grandes vulnerabilidades en las aplicaciones. Estos errores, en su mayoría vienen dados por desconocimiento a fondo del manejo de las secciones de configuración de nuestras aplicaciones. En esta primera parte, veremos los primeros 5 de ellos. 1. El modo Custom Errors Este es el primero de nuestra lista, ya que, será uno de los que casi siempre habilitemos cuando estamos desarrollando una aplicación web y que es de mucho cuidado. Una etiqueta común y vulnerable de esta configuración sería <configuration> <system.web> <customErrors mode="Off">   Una forma de corregir la vulnerabilidad que se expone a continuación sería cambiando la etiqueta por <configuration> <system.web> <customErrors mode="RemoteOnly">

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  • Notebook overheating

    - by user71372
    I'm asking this question because I've tried many tips to solve they don't work and it sounds like a non-fixed bug ubuntu. My problem is with overheating. I've recently installed Ubuntu Precise 12.04 LTS alongside with MS Windows 7 on my notebook Samsung 530U. I'm using both via dual-boot mode. I've no heating problem with MS Win 7 and the fan speed is normal even with long run utilization. However, when booting with Ubuntu and after short time, the PC got very hot and the fan was running at max speed. I installed a tool called Jupiter, I put it in "Power Saving" mode but no result. Now, I avoid using ubuntu because I fear it'll damage my all new notebook. Please can you give me a "FINAL" fix of this problem (lot of answers exist but I don't know the more accurate and efficient one). Thank you in advance.

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  • usb keyboard works except in terminal window (SOLVED)

    - by matrixunloaded
    I just installed 12.10 (clean install and updates). USB keyboard and mouse work fine EXCEPT the keyboard does not work in a terminal window (USB mouse is working in terminal). keyboard is Logitech MK320 and associated mouse. I'm typing in a mozilla window on the keyboard at this very moment and when I switch to the terminal window, nothing can be typed. Any ideas? I use terminal mode alot. Thanks matrixunloaded I didn't realize passwords do not show even an asterisk in terminal mode! I'd just installed 12.10 and was pasting a long sudo command and then typing my password (which looked like nothing appearing)

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  • Le SaaS influence très peu de segments du marché des logiciels, d'après une étude de Forrester

    Le SaaS a peu ou presque pas d'impact sur un grand nombre de segments du marché des logiciels d'après un rapport de Forrester Le marché du SaaS (Software as a Service) depuis quelques années est en très forte croissance. La révolution du SaaS et l'orientation des éditeurs de logiciels vers celui-ci tendent à faire croire que les applications seront pratiquement tous proposées à un moment donné en mode SaaS. Cependant, un récent rapport de Forrester vient modérer cela. En effet, l'analyse de l'impact actuel et futur du SaaS sur 123 segments de marché du logiciel par le cabinet de recherche montre que les logiciels en mode SaaS auront peu d'impact ou même pas sur un grand nombre de ces segments...

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  • Computer refuses to boot either ubuntu disk I'm using

    - by xtraorange
    I'm attempting to set up an Amahi server, and thus have taken an older PC and wiped it clean using DBAN. I'm now in the process of installing Ubuntu, but for some reason the computer refuses to recognize either form of Ubuntu I throw at it, even though it recognizes the Windows XP CD fine. Things it can't be: Boot order - I've tripple checked A bad DVD - I've booted the live CD off of my Mac just fine. A drive issue - the drive boots other cd's just fine, I've tested both an XP and the ultimate boot disk for windows... they are booting fine. A drive conflict - I have unplugged the only hard drive, leaving the DVD drive alone, still no recognition. I've tried both Ubuntu 12 and an older Ubuntu 10 CD, it refuses to recognize either one. It's like my computer has decided it will have nothing to do with Ubuntu. Any help would be greatly appreciated.

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  • Ensure Future Browser Compatibility - SharePoint Branding

    - by KunaalKapoor
    HTML and Future Internet Explorer Compatibility with SharePointAs new versions of Internet Explorer are released, the way HTML is rendered by the browser could change over time. To address the possibility of changes, Microsoft uses the X-UA-Compatible META tag that targets HTML markup to a specific version of Internet Explorer. The default SharePoint 2010 master pages are set to force current and future versions of Internet Explorer to render HTML in Internet Explorer 8 mode like the following markup:<meta http-equiv="X-UA-Compatibile" content="IE=IE8" />The Adventure Works Travel HTML includes the META tag to help ensure future Internet Explorer versions will display the SharePoint HTML properly.For more information about the Internet Explorer Standards Mode, see META Tags and Locking in Future Compatibility.

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  • Bluetooth mouse lag on high cpu load ubuntu 11.04 12.10

    - by sirkubax
    I have just migrate to Ubuntu 12.10 and I have noticed that I have huge problem with my bluetooth mouse left click button on a high load (wired, but scroll and right button are not affected) (I think powersave cpu mode affect that more than cpu load) It just not "trigger the interrupt". Mouse is laggy, click are not reggisterd. I can not work like that. At the same time, my touchpad and usb mouse works great. How to check that - limit cpu frequency (I use powersave and ondemend mode) I now wonder, what should I log, check, measure, to capture enough data to fill bug report. Any suggestions? greetings sirkubax

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  • Unable to Mount an external hard drive (NTFS)

    - by Mediterran81
    Ubuntu 11.10. When I plug my external Drive Western Digital MyPassport (500Go NTFS) I named WD. I get the following error: Unable to mount WD Error mounting: mount exited with exit code 1: helper failed with: mount: according to mtab, /dev/sdb1 is already mounted on /media/WD mount failed I have no problem with the internal NTFS partitions that auto-mounts on startup (ntfs-config does that). If I plug the WD before I boot Ubuntu, upon login, it's recognized and I can access without no problem. But if I remove it using (Safely remove) and then replug it, I get the error above. Here is my fstab: # /etc/fstab: static file system information. # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc nodev,noexec,nosuid 0 0 #Entry for /dev/sda5 : UUID=24540d0f-5803-493c-ace9-e3b3c0cedb26 / ext4 errors=remount-ro 0 1 #Entry for /dev/sda3 : UUID=E4C43F7EC43F51D2 /media/OS ntfs-3g defaults,locale=en_US.UTF-8 0 0 #Entry for /dev/sda2 : UUID=6A0070F10070C61B /media/RECOVERY ntfs-3g defaults,locale=en_US.UTF-8 0 0 #Entry for /dev/sdb1 : UUID=EA6854D268549F5F /media/WD ntfs-3g defaults,nosuid,nodev,locale=en_US.UTF-8 0 0 #Entry for /dev/sda6 : UUID=ed077c52-c50e-406c-9120-9cb6f86ec204 none swap sw 0 0 Here is my mtab /dev/sda5 / ext4 rw,errors=remount-ro,commit=0 0 0 proc /proc proc rw,noexec,nosuid,nodev 0 0 sysfs /sys sysfs rw,noexec,nosuid,nodev 0 0 fusectl /sys/fs/fuse/connections fusectl rw 0 0 none /sys/kernel/debug debugfs rw 0 0 none /sys/kernel/security securityfs rw 0 0 udev /dev devtmpfs rw,mode=0755 0 0 devpts /dev/pts devpts rw,noexec,nosuid,gid=5,mode=0620 0 0 tmpfs /run tmpfs rw,noexec,nosuid,size=10%,mode=0755 0 0 none /run/lock tmpfs rw,noexec,nosuid,nodev,size=5242880 0 0 none /run/shm tmpfs rw,nosuid,nodev 0 0 /dev/sda3 /media/OS fuseblk rw,nosuid,nodev,allow_other,blksize=4096 0 0 /dev/sda2 /media/RECOVERY fuseblk rw,nosuid,nodev,allow_other,blksize=4096 0 0 /dev/sdb1 /media/WD fuseblk rw,nosuid,nodev,allow_other,blksize=4096 0 0 binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,noexec,nosuid,nodev 0 0 gvfs-fuse-daemon /home/hanine/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,user=hanine 0 0 Appearently it cannot be mounted because upon login, it finds that it is already mounted. Some sort of conflict. Does anyone have a clue on how to solve this. Thanks.

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  • iwconfig usage for WEP access point?

    - by johan elmander
    I would like to use my wifi doggle in my pc (ubuntu 12.04). I am able to connect to my access point through the GUI. I would like to do the same in the terminal. My access point uses WEP. So I typed the following commands iwconfig wlan0 mode managed key 6d6f6e6579 iwconfig wlan0 essid "AccessPoint" dhclient wlan0 after typing dhclient wlan0 it waits like 1-2 min then outputs nothing and cannot connect to the Access Point. iwconfig output: wlan0 IEEE 802.11bgn ESSID:"AccessPoint" Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm Retry long timit:7 RTS thr=2347 B Fragment thr:off Encryption key:6D6F-6E65-79 Power Management:off I would appreciate any suggestion

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  • Disable incognito in chrome or chromium

    - by TheIronKnuckle
    I'm addicted to certain websites to the point where it's interfering with my life regularly and sick of it. I want to install website blockers that aren't easy to circumvent. In Chrome, incognito mode is easily accessible with a ctrl-shift-n. That is ridiculous. Whenever I feel an urge to go on an addictive website, it doesn't matter what blockers and regulators I've got installed; three keys can get round them in a second. Simply uninstalling chrome isn't an option either, as it's way too easy to sudo apt-get install it right back. So yes, I want to disable incognito mode completely (and if possible making it totally impossible to get it back). I note that some guy has figured out how to do it on windows with a registry entry: http://wmwood.net/software/incognito-gone-get-rid-of-private-browsing/ If it can be done on windows it can be done on ubuntu!

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  • Performance triage

    - by Dave
    Folks often ask me how to approach a suspected performance issue. My personal strategy is informed by the fact that I work on concurrency issues. (When you have a hammer everything looks like a nail, but I'll try to keep this general). A good starting point is to ask yourself if the observed performance matches your expectations. Expectations might be derived from known system performance limits, prototypes, and other software or environments that are comparable to your particular system-under-test. Some simple comparisons and microbenchmarks can be useful at this stage. It's also useful to write some very simple programs to validate some of the reported or expected system limits. Can that disk controller really tolerate and sustain 500 reads per second? To reduce the number of confounding factors it's better to try to answer that question with a very simple targeted program. And finally, nothing beats having familiarity with the technologies that underlying your particular layer. On the topic of confounding factors, as our technology stacks become deeper and less transparent, we often find our own technology working against us in some unexpected way to choke performance rather than simply running into some fundamental system limit. A good example is the warm-up time needed by just-in-time compilers in Java Virtual Machines. I won't delve too far into that particular hole except to say that it's rare to find good benchmarks and methodology for java code. Another example is power management on x86. Power management is great, but it can take a while for the CPUs to throttle up from low(er) frequencies to full throttle. And while I love "turbo" mode, it makes benchmarking applications with multiple threads a chore as you have to remember to turn it off and then back on otherwise short single-threaded runs may look abnormally fast compared to runs with higher thread counts. In general for performance characterization I disable turbo mode and fix the power governor at "performance" state. Another source of complexity is the scheduler, which I've discussed in prior blog entries. Lets say I have a running application and I want to better understand its behavior and performance. We'll presume it's warmed up, is under load, and is an execution mode representative of what we think the norm would be. It should be in steady-state, if a steady-state mode even exists. On Solaris the very first thing I'll do is take a set of "pstack" samples. Pstack briefly stops the process and walks each of the stacks, reporting symbolic information (if available) for each frame. For Java, pstack has been augmented to understand java frames, and even report inlining. A few pstack samples can provide powerful insight into what's actually going on inside the program. You'll be able to see calling patterns, which threads are blocked on what system calls or synchronization constructs, memory allocation, etc. If your code is CPU-bound then you'll get a good sense where the cycles are being spent. (I should caution that normal C/C++ inlining can diffuse an otherwise "hot" method into other methods. This is a rare instance where pstack sampling might not immediately point to the key problem). At this point you'll need to reconcile what you're seeing with pstack and your mental model of what you think the program should be doing. They're often rather different. And generally if there's a key performance issue, you'll spot it with a moderate number of samples. I'll also use OS-level observability tools to lock for the existence of bottlenecks where threads contend for locks; other situations where threads are blocked; and the distribution of threads over the system. On Solaris some good tools are mpstat and too a lesser degree, vmstat. Try running "mpstat -a 5" in one window while the application program runs concurrently. One key measure is the voluntary context switch rate "vctx" or "csw" which reflects threads descheduling themselves. It's also good to look at the user; system; and idle CPU percentages. This can give a broad but useful understanding if your threads are mostly parked or mostly running. For instance if your program makes heavy use of malloc/free, then it might be the case you're contending on the central malloc lock in the default allocator. In that case you'd see malloc calling lock in the stack traces, observe a high csw/vctx rate as threads block for the malloc lock, and your "usr" time would be less than expected. Solaris dtrace is a wonderful and invaluable performance tool as well, but in a sense you have to frame and articulate a meaningful and specific question to get a useful answer, so I tend not to use it for first-order screening of problems. It's also most effective for OS and software-level performance issues as opposed to HW-level issues. For that reason I recommend mpstat & pstack as my the 1st step in performance triage. If some other OS-level issue is evident then it's good to switch to dtrace to drill more deeply into the problem. Only after I've ruled out OS-level issues do I switch to using hardware performance counters to look for architectural impediments.

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  • ati graphics always on

    - by naveen
    i use a lenovo y560 and has ubunto 12.04 and win 7 installed when i boot into ubunto i find that the ati car is always on which drains the battery and overheats the system is there any to switch off the ati graphics and use intel hd in ubuntu ati hd 5730 is the graphics card that i use and it has switchable graphics in it. in bios the only two options for video adapter is discrete and switchable after installing ati driver from amd website i am getting a commamd prompt as log in screen first error message comes as Your system is running in low-graphics mode with options to run in low graphics mode this time reconfigure exit all three options i am stuck i need to manually reboot the system

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  • How can i change focus when game locks it?

    - by GrizzLy
    I am playing wolfenstein:enemy territory, and if i play it in windowed mode, i can't change focus from game to something else (alt+tab doesnt work). EDIT1: As far as i could try, only ctrl+alt+Fx works (x is one number, for example F1 will switch to terminal). Could i somehow capture this kind of shortcut somewhere on X level and then send it to compiz to change focus (minimize currently focused window)? EDIT2: I found one other way, it works for Wolf:ET, it may help with other games too, if you turn on gameconsole (usually tilde key) game will release mouse lock (in windowed mode).

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