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  • My Big Break - this is my story and I am sticking to it ;)

    - by dbasnett
    The value of undertaking new and difficult tasks can have many wonderful consequences, don't you agree? Here is the story of my big break. Remember yours? During the mid 70's I was in the Navy and worked as a computer operator at the CNO's Command and Control computer system (WWMCCS) in the Washington Navy Yard. I was a tape ape, but knew that I wanted to be a systems programmer. One day the Lieutenant in charge of the OS group was running a test that required the development system to be re-booted, and I was politely hinting that I wanted out of computer operations. As he watched the accounting tape rewind to BOT and then search for where it had just been (severalminutes) he told me if I would fix "that" he would have me transferred. I couldn't say "Deal" fast enough. Up until then my programming experience had been on Edsger Dijkstra's favorite computer (sic), an IBM 1620. It took almost 6 months of learning the assembler for the Honeywell 6000 and finding the code responsible for rewinding the tape and then forwarding it. After much trial and error at o’dark thirty I succeeded. The tape barely moved and my “patch” was later adopted by many other sites. Lieutenant Jack Cowan kept his promise and I have gone on to have a varied and enjoyable career. To Jack, and the rest of the crew (Ken, Stu, Neil, Tom, Silent W, Mr. Jacobs, Roy, Rocco, etc.) I’d like to thank you all.

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  • Apt-get saying "Unable to correct problems, you have held broken packages."

    - by YatharthROCK
    TL;DR: sudo apt-get install ... saying "Unable to correct problems, you have held broken packages." The problem I was trying to get the WebApps feature for PP and QQ following this blog post. I ran the sudo add-apt-repository ppa:webapps/preview command to add the repository, but i got a connection error. Since I know my current ISP gives a shaky connection, I tried again and sure enough, it worked. Then I ran sudo apt-get install unity-webapps-preview, but I realized we had to update apt-get first, so I hit Ctrl + C to stop it. Then I ran sudo apt-get update which worked w/o a fuss, but when I ran sudo apt-get install unity-webapps-preview again later, it showed an error message. Here's the dump: Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: unity-webapps-preview : Depends: xul-ext-unity but it is not going to be installed Depends: xul-ext-websites-integration but it is not going to be installed Depends: xul-ext-webaccounts but it is not going to be installed E: Unable to correct problems, you have held broken packages. I think this might be because of me interrupting the earlier command. It hadn't got a chance to output anything, though — I stopped it pretty fast. What I tried I have tried running a number of commands:- sudo apt-get install --fix-broken sudo apt-get autoclean sudo apt-get autoremove sudo apt-get -f install sudoapt-get install ppa-purgeandsudo ppa-purge ppa:webapps/preview` Even after running sudo apt-get upgrade after every try, none of them worked. Research I tried searching Google, looking at a couple of forums and searching on AU, but to no avail. Help would be appreciated.

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  • login takes long time

    - by Arkaprovo Bhattacharjee
    I am using Ubuntu 12.04 from past 12 days. In the beginning login was fast enough after I put the password it hardly takes 3 to 4 sec to enter in desktop, but now its taking like more that 40 sec to show desktop after entering password. whats the problem, is there any solution? P.S there is only two programs (psensor and jupiter) that starts automatically after login. boot.log fsck from util-linux 2.20.1 /dev/sda6: clean, 254544/3325952 files, 2133831/13285632 blocks * Stopping Userspace bootsplash[164G[ OK ] * Stopping Flush boot log to disk[164G[ OK ] * Starting mDNS/DNS-SD daemon[164G[ OK ] Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd Skipping profile in /etc/apparmor.d/disable: usr.bin.firefox * Starting bluetooth daemon[164G[ OK ] * Starting network connection manager[164G[ OK ] * Starting AppArmor profiles [170G [164G[ OK ] * Stopping System V initialisation compatibility[164G[ OK ] * Starting CUPS printing spooler/server[164G[ OK ] * Starting System V runlevel compatibility[164G[ OK ] * Starting Bumblebee supporting nVidia Optimus cards[164G[ OK ] * Starting LightDM Display Manager[164G[ OK ] * Starting save kernel messages[164G[ OK ] * Starting anac(h)ronistic cron[164G[ OK ] * Starting ACPI daemon[164G[ OK ] * Starting regular background program processing daemon[164G[ OK ] * Starting deferred execution scheduler[164G[ OK ] speech-dispatcher disabled; edit /etc/default/speech-dispatcher * Starting CPU interrupts balancing daemon[164G[ OK ]

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  • What the Hekaton?

    - by Tony Davis
    Hekaton, the power behind SQL Server 2014′s In-Memory OLTP technology, is intended to make data operations run orders of magnitude faster on SQL Server. This works its magic partly by serving database workloads entirely from main memory, using memory-optimized table structures. It replaces the relational engine’s standard locking model with an optimistic concurrency model based on time-stamped row versions. Deeper down the Hekaton engine uses new, ‘latch free’ data structures. So far, so good, but performance improvements on this scale require a compromise, and the compromise is that these aren’t tables as we understand them. For the database developer, these differences are painful because they involve sacrificing some very important bits of the relational model. Most importantly, Hekaton tables don’t currently support FOREIGN KEY constraints or CHECK constraints, and you can’t put the checks in triggers because there aren’t any DML triggers either. Constraints allow a relational designer to enforce relational integrity and data integrity. Without them, of course, ‘bad data’ can get into our Hekaton tables. There is no easy way of preventing it. For several classes of database and data, this is a show-stopper. One may regard all these restrictions regretfully, seeing limited opportunity to try out Hekaton with current databases, but perhaps there is also a sudden glow of recognition. Isn’t this how we all originally imagined table variables were going to be, back in SQL 2005? And they have much the same restrictions. Maybe, instead of pretending that a currently-designed database can be ‘Hekatonized’ with a few mouse clicks, we should redesign databases for SQL 2014 to replace table variables with Hekaton tables, exploiting this technology for fast intermediate processing, and for the most part forget, for now, the idea of trying to convert our base relational tables into Hekaton tables. Few database developers would be averse to having their working tables running an order of magnitude faster, as long as it didn’t compromise the integrity of the data in the base tables.

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  • Bluetooth mouse Logitech M555b not recognized on a Macbook Pro 8.2

    - by Pierre
    I just bought a Logitech M555b Bluetooth mouse today. My computer (a Macbook Pro 8,2) has a bluetooth connection, and it works perfectly fine on Mac OSX (I set up a new device, click the connect button on the mouse, and voilà, done in 5 seconds). I cannot get it to work on Ubuntu 12.04. When I follow the same steps as on Mac OSX under Ubuntu 12.04, Sometimes I will see the mouse name appearing for 1 second on the screen, and if I'm fast enough to click on "Continue", I will have a message telling me the pairing with my mouse failed. Here are the steps I follow: Turn off Bluetooth on Ubuntu Turn Bluetooth on. Bluetooth icon Set up new device... Turn on the mouse, and press the Connect button. Press "Continue" on the Bluetooth New Device Setup screen I see the mouse name for one second, but then it disappear. Click on PIN options... to select '0000'. ... nothing, Ubuntu won't see anything. In the /var/log/syslog, I have the following information: May 27 23:26:16 Trane bluetoothd[896]: HCI dev 0 down May 27 23:26:16 Trane bluetoothd[896]: Adapter /org/bluez/896/hci0 has been disabled May 27 23:26:58 Trane bluetoothd[896]: HCI dev 0 up May 27 23:26:58 Trane bluetoothd[896]: Adapter /org/bluez/896/hci0 has been enabled May 27 23:26:58 Trane bluetoothd[896]: Inquiry Cancel Failed with status 0x12 May 27 23:28:26 Trane bluetoothd[896]: Refusing input device connect: No such file or directory (2) May 27 23:28:26 Trane bluetoothd[896]: Refusing connection from 00:1F:20:24:15:3D: setup in progress May 27 23:28:26 Trane bluetoothd[896]: Discovery session 0x7f3409ab5b70 with :1.84 activated I tried for an hour, I restarted my computer, re-paired the mouse on Mac OSX, etc. Sometimes when I restart the computer, I have a dialog box showing up saying that the mouse M555b wants to access some resources or something, if I click "Grant", or even if I tick "always grant access", nothing happens... How can I get the Bluetooth to work properly? Help!

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  • How do I install BCM4312 wireless drivers?

    - by t3ch
    completely new to Ubuntu. How do I add Wireless driver for my laptop? I am running a Dell XPS M1330. Right now its acts as if I dont have a Wi-Fi card. :~$ lspci 00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 0c) 00:01.0 PCI bridge: Intel Corporation Mobile PM965/GM965/GL960 PCI Express Root Port (rev 0c) 00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 (rev 02) 00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 02) 00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 02) 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02) 00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 02) 00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 (rev 02) 00:1c.3 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 4 (rev 02) 00:1c.5 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 6 (rev 02) 00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 02) 00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 02) 00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 02) 00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 02) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f2) 00:1f.0 ISA bridge: Intel Corporation 82801HEM (ICH8M) LPC Interface Controller (rev 02) 00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE Controller (rev 02) 00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA AHCI Controller (rev 02) 00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 02) 01:00.0 VGA compatible controller: nVidia Corporation G86 [GeForce 8400M GS] (rev a1) 03:01.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev 05) 03:01.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 22) 03:01.2 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 12) 03:01.3 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 12) 09:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5906M Fast Ethernet PCI Express (rev 02) 0c:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)

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  • Coarse Collision Detection in highly dynamic environment

    - by Millianz
    I'm currently working a 3D space game with A LOT of dynamic objects that are all moving (there is pretty much no static environment). I have the collision detection and resolution working just fine, but I am now trying to optimize the collision detection (which is currently O(N^2) -- linear search). I thought about multiple options, a bounding volume hierarchy, a Binary Spatial Partitioning tree, an Octree or a Grid. I however need some help with deciding what's best for my situation. A grid seems unfeasible simply due to the space requirements and cache coherence problems. Since everything is so dynamic however, it seems to be that trees aren't ideal either, since they would have to be completely rebuilt every frame. I must admit I never implemented a physics engine that required spatial partitioning, do I indeed need to rebuild the tree every frame (assuming that everything is constantly moving) or can I update the trees after integrating? Advice is much appreciated - to give some more background: You're flying a space ship in an asteroid field, and there are lots and lots of asteroids and some enemy ships, all of which shoot bullets. EDIT: I came across the "Sweep an Prune" algorithm, which seems like the right thing for my purposes. It appears like the right mixture of fast building of the data structures involved and detailed enough partitioning. This is the best resource I can find: http://www.codercorner.com/SAP.pdf If anyone has any suggestions whether or not I'm going in the right direction, please let me know.

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  • NRF Big Show 2011 -- Part 1

    - by David Dorf
    When Apple decided to open retail stores, they came to 360Commerce (now part of Oracle Retail) to help with the secret project. Similarly, when Disney Stores decided to reinvent itself, they also came to us for their POS system. In both cases visiting a store is an experience where sales take a backseat to entertainment, exploration, and engagement This quote from a recent Stores Magazine article says it all: "We compete based on an experience, emotion and immersion like Disney," says Neal Lassila, vice president of global information technology for Disney. "That's opposed to [competing] on price and hawking a doll for $19.99. There is no sales pressure technique." Instead, it's about delivering "a great time." While you're attending the NRF conference in New York next week, you'll definitely want to stop by the new 20,000 square-foot Disney store in Times Square. If you're not attending, you can always check out the videos to get a feel for the stores' vibe. This year we've invited Disney Stores to open a pop-up store within the Oracle Retail booth. There will be lots of items on sale that fit in your suitcase, and there's no better way to demonstrate our POS, including the mobile POS running on an iPod Touch. You should also plan to attend Tuesday morning's super-session The Magic of the Disney Store: An Immersive Retail Experience with Steve Finney. In the case of Apple and Disney, less POS is actually a good thing. In both cases it was important to make the checkout process fast and easy so as not to detract from the overall experience. There will be ample opportunities to see this play out in New York next week, so I hope you take advantage.

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  • SAP or Navision? Career Path

    - by codebased
    This could be tricky to ask; I may or may not ask this question here but I thought to give it a try. I've been in Software Industry since 2002 and now it has been a time that I'm at Senior level where I normally code, lead and define the architect; giving technical solutions to the management is one of my asset that I've earned during my services. Now it is the time to define the road map for the future, $$$. I am not in favor of Project Management roles. I've been thinking of going through the ERP and my current company does provide me an option to go for Navision/ Microsoft Dynamics. They are currently on 4.0 but they are planning to move for 2009 and also to build one of their own plug-in. Indeed the option is good because Microsoft is trying to accomplish the market for Dynamics products. However, they have less success in Australia. Now, Another option is with SAP where person can go with 200 K $ a year. Where as I'd doubt that if the same kind of growth, financial, is available for Microsoft geek. What is your opinion on Navision or SAP? If I try to completely move to SAP it could be bit challenging as market will consider me a fresher. However the return is quite good. Where in case of Microsoft, I think technology changes so fast that there is a less chance to grow in, within, the same experience; in other word, if any new framework comes in .net then market look for that person who knows this new framework and not .net But in case of SAP, where the base remain same and chances are to grab more money from the market. What would you do if you were me? In stackoverflow - Navision questions are 20+ where in SAP 200+///?? :-)

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  • Resolve Instructional Webcast Series

    - by Get Proactive Customer Adoption Team
    Untitled Document Catch the Express—Register for an Instructional Webcast Oracle Proactive Support’s ‘Get Proactive’ message to customers underscores the benefits they’ll obtain by leveraging the Prevent, Resolve and Upgrade capabilities available across the suite of Oracle Products. Our goal in Proactive Support is to show customers how to ‘Get Proactive’ and achieve success by leveraging the latest tools, knowledge, and best practices available to manage your applications and technology more proactively. Most importantly, we want to ensure that customers are proficient in the use of these proactive capabilities. To help you gain this proficiency, we’ve recently launched a series of instructional webcasts that we call the “Resolve Series.” This series consists of both live and on-demand webcasts, and features some of the key proactive capabilities that customers can leverage to resolve their own problems. We launched the first phase of the series in July, and focused on finding answers using the My Oracle Support portal. Among the topics covered in those sessions were best practices for searching the knowledge base, leveraging communities to find answers faster, and other proactive features of My Oracle Support The second phase of the series is set to kick off in September. This phase will include product specific sessions designed to provide customers who use the product with the skills and knowledge required to leverage some of the most important capabilities found under the “RESOLVE” category of our proactive portfolio on My Oracle Support. These webcasts will feature Subject Matter Experts demonstrating how to use the tools and capabilities, discussing best practices, and providing answers to any questions you might have. In addition, hands-on labs will be included in some of the sessions, allowing you to practice applying what you’ve just learned. Whether you are a new customer or you’ve worked with Oracle Support for years, you’ll discover new information and techniques to help you work more efficiently and keep your systems running smoothly. Leverage this opportunity to learn best practices and get the inside track on finding answers fast by using the right tools at the right time. Make sure to take advantage of these webcasts and maximize the value you receive from your Oracle Premier Support investment. See the full schedule of events and register for sessions.

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  • Desktop forgets theme?

    - by Marcelo Cantos
    I am running Ubuntu in VirtualBox (on a Windows 7 host). Several times now, the top-level menu bar, the task bar — and seemingly every system dialog — have forgotten the out-of-the-box "Ambiance" theme they conform to when I first installed the system. Window captions still preserve the theme, but pretty much nothing else does. I have searched high and low on Google for assistance with this problem. Everything I've found suggests either running some gconf reset or deleting .gconf* .gnome* and other similar directories. I have followed all this advice and nothing works. I still get a boring Windows-95-style gray 3D look and feel. On previous occasions, after much messing around I've given up and rebooted the VM instance, and been pleasantly suprised to see the original "Ambience" theme restored throughout the UI, but invariably it disappears again some time later, usually after a reboot, so I can never figure out what I did that broke it. Here's a sample from Ubuntu's site of what I want it to look like. And here's a screenshot of my system as it currently looks. Also note that my GNOME Terminals normally have a nice purple semi-translucent look, and as can be seen from the screenshot, they are now just a solid matte white. This last time (just yesterday), trying numerous combinations all the usual tricks and rebooting several times hasn't fixed it, so here I am on SU wondering: How do I recover the out-of-the-box theme for my Gnome/Ubuntu desktop, noting that blowing away all config files — as suggested in many places online — fails to achieve this? It might help to know that it seems to fail either after I resize the VM instance, forcing the Ubuntu desktop to resize itself, or after I play around with Compiz settings. I haven't been able to figure out which of these it is, and it could be neither. Given the amount of pain I have had to go through to get things back to normal (and given that I am at a loss as to how to do so), it has proven difficult to definitively isolate the cause.

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  • Is it bad practice for a module to contain more information than it needs?

    - by gekod
    I just wanted to ask for your opinion on a situation that occurs sometimes and which I don't know what would be the most elegant way to solve it. Here it goes: We have module A which reads an entry from a database and sends a request to module B containing ONLY the information from the entry module B would need to accomplish it's job (to keep modularity I just give it the information it needs - module B has nothing to do with the rest of the information from the read DB entry). Now after finishing it's job, module B has to reply to a module C if it succeeded or failed. To do this module B replies with the information it has gotten from module A and some variable meaning success or fail. Now here comes the problem: module C needs to find that entry again BUT the information it has gotten from module B is not enough to uniquely find the exact same entry again. I don't think that module A giving more information to module B which it doesn't need to do it's job but which it could then give back to module C would be a good practice because this would mean giving some module information it doesn't really need. What do you think?

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  • How To Backup Of MySQL Database Using PhpMyAdmin

    - by Jyoti
    It is very important to do backup of your MySql database, you will probably realize it when it is too late. A lot of web applications use MySql for storing the content. This can be blogs, and a lot of other things. When you have all your content as html files on your web server it is very easy to keep them safe from crashes, you just have a copy of them on your own PC and then upload them again after the web server is restored after the crash. All the content in the MySql database must also be backed up. If you have spent a lot of time making the content and it is only stored in the Mysql server, you will feel very bad if it gets lost for ever. Backing it up once every month or so makes sure you never loose too much of your work in case of a server crash, and it will make you sleep better at night. It is easy and fast, so there is no reason for not doing it. Step 1: Log into phpMyAdmin on your server. Step2: You can select the database that you would like to backup from the drop-down menu called Database. Step 3: A new page will be loaded in phpMyAdmin showing the selected database. In order to proceed with the backup click on the Export tab. Step 4: The options that you should select apart from the default ones are Save as file which will save the file locally to your computer in an .sql format and Add DROP TABLE which will add the drop table functionality if the table already exists in the database backup as shown below. Step 5: Click on the Go button to start the export/backup procedure for your database. A download window will pop up prompting for the exact place where you would like to save the file on your local computer. It is possible that the download starts automatically. This depends on your browser’s settings.

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  • Dlink DWA-643 ExpressCard / Atheros AR5008 can't connect to wifi networks

    - by Justin Kelly
    I've just purchased a D-Link DWA-643 Xtreme N ExpressCard Notebook Adapter - but it can't connect to my wireless network The card is listed on the FSF website and - refer links below: http://www.fsf.org/resources/hw/index_html/net/wireless/index_html/cards.html http://www.dlink.com.au/products/?pid=550 Ubuntu see the card as using the Atheros AR5008 chipset - refer image below The card lights up and I can see that available wifi networks using this card - so it seems to 'just work' on ubuntu 12.04 but when i try and connect to my networks - it fails I've tried setting the network to all the different options (WEP, WPA2, no encryption, etc.. b/g/n ) but ubuntu sill cant connect to it I've also installed wicd but still couldn't connect Has anyone got a DWA-643 to work in Ubuntu? Or does anyone have any suggestion on how to get it to connect?? Any help would be greatly appreciated Note: the laptop has built in wifi but its broadcom, works but with dialup speed connection - and i've had nothign but trouble using the boardcom drivers so purchased the FSF recommended PCI expresscard as i hoped it would 'just work' on the latest Ubuntu i've have tried to disable the built in wifi - broadcom - but even with the broadcom uninstall and unavailable it didnt help the dlink to connect previously I had MAC address filtering on the router - i've added the dlinks MAC - and also disabled MAC address filtering - still no luck lspci output below: 18:00.0 Network controller: Atheros Communications Inc. AR5008 Wireless Network Adapter (rev 01) Subsystem: D-Link System Inc Device 3a6f Flags: bus master, fast devsel, latency 0, IRQ 18 Memory at e4000000 (64-bit, non-prefetchable) [size=64K] Capabilities: [40] Power Management version 2 Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit- Capabilities: [60] Express Legacy Endpoint, MSI 00 Capabilities: [90] MSI-X: Enable- Count=1 Masked- Capabilities: [100] Advanced Error Reporting Capabilities: [140] Virtual Channel Kernel driver in use: ath9k Kernel modules: ath9k

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  • Why do I need to create a bios-grub partition when I install 12.04?

    - by raj
    Is the bios-grub partition in Ubuntu 12.04 mandatory? I have used 11.04, 11.10 and 12.04, But I was never asked for this. Today I tried a fresh installation of Ubuntu 12.04 and for the first time I was asked for this Grub partition of minimum 1Mb. I first tried to reinstall 12.04, but the error continued. So I installed Fedora 16, Keeping all partitions as they were (replaced Ubuntu with Fedora), And then did another fresh installation of 12.04. Is it ok to continue with this grub partition or is there a fault in my system's hardware? If this is a (hardware) fault, how can I fix it? I'm using a Lenovo S10-2 Ideapad. The only OS right now installed is Ubuntu 12.04. well, let me answer. It was /usr/bin/xorg issue that I had with firstly installed precise. I used fedora16 basically for removing precise totally (my experience tells me ubuntu can't completely erase and reinstall by itself). this 1mb grub is created by fedora. I then wanted to remove it while reinstalling ubuntu but got caution bootloader may fail. hence I have to keep this 1mb drive. but prior to yesterday, i used both fedora and ubuntu, even same CDs, but had no such partition. my question is if this partition is necessary or not? if not, how can i safely remove it from my system? Am using only ubuntu 12.04 -- before and after (now).

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  • How do I target a specific driver for libata kernel parameter modding?

    - by DanielSmedegaardBuus
    Sorry for the cryptic title. Not sure how to phrase it. This is it in a nutshell: I'm running a 22-disk setup, 19 of those in a ZFS array, 15 of those backed by three port multipliers attached to SATA controllers driven by the sata_sil24 module. When running full speed (SATA2, i.e. 3 Gbps), the operation is pretty quirky (simple read errors will throw an entire PMP into spasms for a long time, sometimes with pretty awful results). Booting with kernel parameter libata.force=1.5G to force SATA controllers into "legacy" speeds completely fixes all issues with the PMPs. Thing is, my ZFS pool is backed by a fast cache SSD on my ICH10R controller. Another SSD on this same controller holds the system. Doing libata.force=1.5G immediately shaves about 100 MB/s off the transfer rate of my SSDs. For the root drive, that's not such a big deal, but for the ZFS cache SSD, it is. It effectively makes the entire zpool slower for sustained transfers than it would've been without the cache drive. Random access and fs tree lookups, of course still benifit. I'm hoping, though, that there's some way to pass the .force=1.5G parameter on to just the three SATA controllers being backed by the sata_sil24 module. But listing the module options for this, no such option exists. Is this possible? And if so, how? Thanks :)

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  • PLINQ Adventure Land - WaitForAll

    - by adweigert
    PLINQ is awesome for getting a lot of work done fast, but one thing I haven't figured out yet is how to start work with PLINQ but only let it execute for a maximum amount of time and react if it is taking too long. So, as I must admit I am still learning PLINQ, I created this extension in that ignorance. It behaves similar to ForAll<> but takes a timeout and returns false if the threads don't complete in the specified amount of time. Hope this helps someone else take PLINQ further, it definitely has helped for me ...  public static bool WaitForAll<T>(this ParallelQuery<T> query, TimeSpan timeout, Action<T> action) { Contract.Requires(query != null); Contract.Requires(action != null); var exception = (Exception)null; var cts = new CancellationTokenSource(); var forAllWithCancellation = new Action(delegate { try { query.WithCancellation(cts.Token).ForAll(action); } catch (OperationCanceledException) { // NOOP } catch (AggregateException ex) { exception = ex; } }); var mrs = new ManualResetEvent(false); var callback = new AsyncCallback(delegate { mrs.Set(); }); var result = forAllWithCancellation.BeginInvoke(callback, null); if (mrs.WaitOne(timeout)) { forAllWithCancellation.EndInvoke(result); if (exception != null) { throw exception; } return true; } else { cts.Cancel(); return false; } }

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  • How to connect two ubuntu computers with ethernet cable

    - by Lukasz Zaroda
    I'm trying to connect with ethernet cable two computers - desktop and laptop. What I want to do is transfer a lot of data from one to another. The problem is that I'm doing everything from: How to network two Ubuntu computers using ethernet (without a router)? But after that, ping always gives me "Destination host unreachable". I was searching a while but couldn't figure out what is a reason it doesn't work, maybe it's something about my devices or maybe someone will have another idea. Ethernet cable I got with my router. There is a text printed on it: Aurit Data Cable Cat.5 UTP 26AWG 4PAIR AWM PUC 75°C EIA/TIA 568B It's connecting now my desktop to router, so I can send this question. My desktop: System: Ubuntu 12.04 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 03) "ethtool -i eth0" output: driver: r8169 version: 2.3LK-NAPI firmware-version: rtl_nic/rtl8168d-1.fw bus-info: 0000:01:00.0 supports-statistics: yes supports-test: no supports-eeprom-access: no supports-register-dump: yes My laptop: System: Ubuntu 14.04 Ethernet controller: Qualcomm Atheros AR8162 Fast Ethernet (rev 08) "ethtool -i eth0" output: driver: alx version: firmware-version: bus-info: 0000:01:00.0 supports-statistics: no supports-test: no supports-eeprom-access: no supports-register-dump: no supports-priv-flags: no My iptables are accepting everything. Any ideas why I cannot reach other computer?

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  • RTFMobile

    - by ultan o'broin
    It may seem obvious but it’s worth stating again. The idea that mobile users are going to read lots of user assistance on their devices is just wrong. So, Jakob Nielsen’s post Mobile Content Is Twice as Difficult serves as a timely reminder for anyone thinking of putting manuals as a form of user assistance onto mobile phones. There is also an excellent post on UXMag.com, explaining that one of the ways to screw up with your iPhone app is to throw an old-style user manual into the user experience: 10 Surefire Ways to Screw Up Your iPhone App.   (Image copyright and referenced from UX Magazine 2010)   Instead, user assistance  alternatives—if any at all—include one-time tours, graphics, in-context instructions, and so on. Not so sure that importing “humor” and “personality” work so well in the enterprise app space, myself. However, the message is clear: iPhone users don’t read manuals. Great message. Users will figure it out, and if they can’t, well then your app’s UX is a problem and the app will fail. Shame some teams are obsessed with figuring out ways to port existing manuals to mobile platforms without any thought for the UX. Razorfish’s Scatter/Gather blog says it all: One thing that is particularly discouraging, most material currently available on “Creating Content for the iPad” or similar themes turns out to be about getting traditional content onto, or into, the iPad. Now, manuals for non-end users in PDF format on eReaders is a different matter. I have research on that, but it’s for another post. Technorati Tags: mobile,user assistance,UX,user experience,manuals,documentation

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  • Common way of animating 'motion' for walk cycle animations

    - by Ben Hymers
    I've just posted this at the Blender artists' forums before realising I would probably get a better response from a more game development-specific audience, so apologies for cross-posting! It's for the right reasons :) I'm a programmer trying to animate a character walking for a game project, using Ogre. I've made a very simple walk cycle in Blender and exported it to Ogre, and it plays just fine. By fine, I mean it works, but there's terrible foot sliding. This is because I just animated the walk in-place (at the origin) in Blender, and of course I don't know what "speed of walk" that corresponds to, so when I move the character in-game the motion doesn't necessarily match up with the movement of the feet in the animation. So my question is: what's the normal approach for this kind of thing? At work we use Maya, and the animators either animate a special 'moveTrans' node that represents the "position" of the character (or have the exporter generate it for them from the movement of the root node), then the game can read this to know how fast the animation moves the character. So in the Maya file, the character will walk forward for one cycle and this extra node will follow along with them by their feet. I've not seen anything like this in open-source land, and there's certainly no provision for that in the Ogre Exporter script. What do you chaps normally do for this?

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  • My boss is feuding with his boss. My workload is expanding What should I do?

    - by steve
    These two have always had a somewhat shaky relationship when they were on the same level. The other guy was recently promoted to director and now my boss reports to him. On the surface, they appear to get along when they get together, but my boss despises the man and badmouths him every chance that he gets (to peers, subordinates, etc). He believe that the director is setting him up to fail. The Director and upper management is holding my boss responsible for the not-so-great performance by the team as of late. He's been playing games to make my boss look bad. Due to lay offs, we don't have the manpower to deliever the results that we did before...but expectations have not lowered...and my boss is taking the heat for it. Now he's on the warpath and starting to micromanage. He's giving everyone more work. He's forcing us midlevel guys to take responsibility for the level one techs' performance. I'm spending less and less time coding....and more time babysitting vendors, techs, etc. I'm not so sure that's a bad thing because I'm sorta burnt out on coding, but I don't really care for the idea of having to be responsible for others poor performance....isn't that the manager's job? Anyway, do you guys have any suggestions on dealing with the situation?

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  • Adding complexity by generalising: how far should you go?

    - by marcog
    Reference question: http://stackoverflow.com/questions/4303813/help-with-interview-question The above question asked to solve a problem for an NxN matrix. While there was an easy solution, I gave a more general solution to solve the more general problem for an NxM matrix. A handful of people commented that this generalisation was bad because it made the solution more complex. One such comment is voted +8. Putting aside the hard-to-explain voting effects on SO, there are two types of complexity to be considered here: Runtime complexity, i.e. how fast does the code run Code complexity, i.e. how difficult is the code to read and understand The question of runtime complexity is something that requires a better understanding of the input data today and what it might look like in the future, taking the various growth factors into account where necessary. The question of code complexity is the one I'm interested in here. By generalising the solution, we avoid having to rewrite it in the event that the constraints change. However, at the same time it can often result in complicating the code. In the reference question, the code for NxN is easy to understand for any competent programmer, but the NxM case (unless documented well) could easily confuse someone coming across the code for the first time. So, my question is this: Where should you draw the line between generalising and keeping the code easy to understand?

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  • PASS Business Intelligence Virtual Chapter Upcoming Sessions (November 2013)

    - by Sergio Govoni
    Let me point out the upcoming live events, dedicated to Business Intelligence with SQL Server, that PASS Business Intelligence Virtual Chapter has scheduled for November 2013. The "Accidental Business Intelligence Project Manager"Date: Thursday 7th November - 8:00 PM GMT / 3:00 PM EST / Noon PSTSpeaker: Jen StirrupURL: https://attendee.gotowebinar.com/register/5018337449405969666 You've watched the Apprentice with Donald Trump and Lord Alan Sugar. You know that the Project Manager is usually the one gets firedYou've heard that Business Intelligence projects are prone to failureYou know that a quick Bing search for "why do Business Intelligence projects fail?" produces a search result of 25 million hits!Despite all this… you're now Business Intelligence Project Manager – now what do you do?In this session, Jen will provide a "sparks from the anvil" series of steps and working practices in Business Intelligence Project Management. What about waterfall vs agile? What is a Gantt chart anyway? Is Microsoft Project your friend or a problematic aspect of being a BI PM? Jen will give you some ideas and insights that will help you set your BI project right: assess priorities, avoid conflict, empower the BI team and generally deliver the Business Intelligence project successfully! Dimensional Modelling Design Patterns: Beyond BasicsDate: Tuesday 12th November - Noon AEDT / 1:00 AM GMT / Monday 11th November 5:00 PM PSTSpeaker: Jason Horner, Josh Fennessy and friendsURL: https://attendee.gotowebinar.com/register/852881628115426561 This session will provide a deeper dive into the art of dimensional modeling. We will look at the different types of fact tables and dimension tables, how and when to use them. We will also some approaches to creating rich hierarchies that make reporting a snap. This session promises to be very interactive and engaging, bring your toughest Dimensional Modeling quandaries. Data Vault Data Warehouse ArchitectureDate: Tuesday 19th November - 4:00 PM PST / 7 PM EST / Wednesday 20th November 11:00 PM AEDTSpeaker: Jeff Renz and Leslie WeedURL: https://attendee.gotowebinar.com/register/1571569707028142849 Data vault is a compelling architecture for an enterprise data warehouse using SQL Server 2012. A well designed data vault data warehouse facilitates fast, efficient and maintainable data integration across business systems. In this session Leslie and I will review the basics about enterprise data warehouse design, introduce you to the data vault architecture and discuss how you can leverage new features of SQL Server 2012 help make your data warehouse solution provide maximum value to your users. 

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  • Session management error: None of the authentication protocols specified are supported

    - by JBWhitmore
    The title is the first error that has sent me on a mission to fix things. Motivation: I was trying to install the new Enthought Python Distribution -- when the error above first showed up. The install finished -- and looked like there were a few more times it flagged dcopserver problems: Please check that "dcopserver" program is running! Could not read network connection list: ~/home/user/.DCOPserver_host__0 When running ipython from the distribution, it claims that readline (the ability to up arrow in history or tab-complete) is not available for my system. It is though -- if I run the ipython that's sitting in /usr/bin/ipython all readline features work perfectly. So, I tried to fix the install by trying to fix what I thought could be causing the problems. Bad things that are happening that I want to be fixed: When restarting I get the error: Could not update ICEauthority file /home/username/.ICEauthority. ipython readline doesn't work with Enthought's ipython Things I have tried: changed the owner of my ~/.ICEauthority to be me. changed the owner of home directory (and all nested files and folders) to be me double checked that /var/lib/gdm was owned by Gnome (yep) attempted to reinstall DCOP, kbuildsycoca stuff (fail) I've removed nautilus; rebooted; reinstalled; rebooted; removed ubuntu-desktop; rebooted; reinstalled; rebooted. Any suggestions on how to fix the Bad Things that are happening would be greatly appreciated! Computer: Ubuntu 10.04 x86

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  • Why maven so slow compared to automake?

    - by ???'Lenik
    I have a Maven project consists of around 100 modules. I have reason to decompose the project to so many modules, and I don't think I should merge them in order to speed up the build process. I have read a lot of projects by other people, e.g., the Maven project itself, and Apache Archiva, and Hudson project, they all consists of a lot of modules, nearly 100 maybe, more or less. The problem is, to build them all need so much time, 3 hours for the first time build (this is acceptable because a lot of artifacts to download), and 15 minutes for the second build (this is not acceptable). For automake, things are similarly, the first time you need to configure the project, to prepare the magical config.h file, it's far more complex then what maven does. But it's still fast, maybe 10 seconds on my Debian box. After then, make install requires maybe 10 minutes for the first time build. However, when everything get prepared, the .o object files are generated, they don't have to be rebuild at all for the second time build. (In Maven, everything rebuild at everytime.) I'm very wondering, how guys working for Maven projects can bare this long time for each build, I'm just can't sit down calmly during each time Maven build, it took too long time, really.

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