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  • java virtual machine - how does it allocate resources?

    - by Will
    I am testing the performance of a data streaming system that supports continuous queries. This is how it works: - There is a polling service which sends data to my system. - As data passes into the system, each query evaluates based on a window of the stream at the current time. - The window slides as data passes in. My problem is this, when I add more queries to the system, I should expect the throughput to decrease because it can't cope the data rate. However, I actually observe an increase in throughput. I can't understand why this is the case and I am guessing that it's something to do with the way the JVM allocates CPU, memory etc. Can anyone shed any light to my problem?

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  • Coordinating 3 instances of Cycle on one page

    - by Wendy H
    I have 3 images, all same size, across top of page horizontally. I'd like to use Cycle to fade each instance very slowly, but I'd also like make sure the transitions do not start all at the same time, but are staggered. Is there somewhere this can be specified? If anyone can recommend a very slow fade rate, plus a way to prevent all 3 from fading/regenerating at the same time, I'd be very grateful! I assume I can run 3 instances of cycle using different classes for each container, and assure that no two photos are the same by "stacking" them in different orders within the divs ... yes? Thank you!

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  • In linux, is it possible to do partial reads on a regular file

    - by Jimm
    I need to write an application that spits out log entries to a regular file at a very fast rate. Also, there will be another process, that can read the same file concurrently at the time, other process would be writing to it. I have following questions How does read() determine EOF, specially in the case, where the underlying file could be concurrently being modified? Is it possible for read() to return partially written data from the other process write? For example, the write process wrote half a line and read would pick that half line and return? The application would be written in C on linux 2.6.x using Ex4 filesystem UPDATE: Below link points to the patch, that locks inode in EXT4, before reading and writing. http://patchwork.ozlabs.org/patch/91834/

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  • OpenGL performance on rendering "virtual gallery" (textures)

    - by maticus
    I have a considerable (120-240) amount of 640x480 images that will be displayed as textured flat surfaces (4 vertex polygons) in a 3D environment. About 30-50% of them will be visible in a given frame. It is possible for them to crossover. Nothing else will be present in the environment. The question is - will the modern and/or few-years-old (lets say Radeon 9550) GPU cope with that, and what frame rate can I expect? I aim for 20FPS, but 30-40 would be nice. Would changing the resolution to 320x240 make it more probable to happen? I do not have any previous experience with performance issues of 3D graphics on modern GPUs, and unfortunately I must make a design choice. I don't want to waste time on doing something that couldn't have worked :-)

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  • Problems with the Enterframe Event

    - by user434565
    Hey guys, I have been developing a game using Flex, and used the Timer class to keep the main loop going. However, when I tried using the enterFrame event to do the main loop, there were a few problems. First of all, physics simulation seemed way too fast. Is the enterFrame event called more than once per frame? I set the application's global frame rate to 24, so shouldn't the application set off the event every 1/24 of a second? And the second problem is that when the game runs like this, some MXML components that are added are not shown. I have absolutely no idea why this happens. Help me please?!? Thanks.

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  • BIP BIServer Query Debug

    - by Tim Dexter
    With some help from Bryan, I have uncovered a way of being able to debug or at least log what BIServer is doing when BIP sends it a query request. This is not for those of you querying the database directly but if you are using the BIServer and its datamodel to fetch data for a BIP report. If you have written or used the query builder against BIServer and when you run the report it chokes with a cryptic message, that you have no clue about, read on. When BIP runs a piece of BIServer logical SQL to fetch data. It does not appear to validate it, it just passes it through, so what is BIServer doing on its end? As you may know, you are not writing regular physical sql its actually logical sql e.g. select Jobs."Job Title" as "Job Title", Employees."Last Name" as "Last Name", Employees.Salary as Salary, Locations."Department Name" as "Department Name", Locations."Country Name" as "Country Name", Locations."Region Name" as "Region Name" from HR.Locations Locations, HR.Employees Employees, HR.Jobs Jobs The tables might not even be a physical tables, we don't care, that's what the BIServer and its model are for. You have put all the effort into building the model, just go get me the data from where ever it might be. The BIServer takes the logical sql and uses its vast brain to work out what the physical SQL is, executes it and passes the result back to BIP. select distinct T32556.JOB_TITLE as c1, T32543.LAST_NAME as c2, T32543.SALARY as c3, T32537.DEPARTMENT_NAME as c4, T32532.COUNTRY_NAME as c5, T32577.REGION_NAME as c6 from JOBS T32556, REGIONS T32577, COUNTRIES T32532, LOCATIONS T32569, DEPARTMENTS T32537, EMPLOYEES T32543 where ( T32532.COUNTRY_ID = T32569.COUNTRY_ID and T32532.REGION_ID = T32577.REGION_ID and T32537.DEPARTMENT_ID = T32543.DEPARTMENT_ID and T32537.LOCATION_ID = T32569.LOCATION_ID and T32543.JOB_ID = T32556.JOB_ID ) Not a very tough example I know but you get the idea. How do I know what the BIServer is up to? How can I find out what the issue might be if BIServer chokes on my query? There are a couple of steps: In the Administrator tool you need to set the logging level for the Administrator user to something greater than the default '0'. '7' is going to give you the max. Just remember to take it back down after you have finished the debug. I needed to bounce my BIServer service Now here's the secret sauce. Prefix the following to your BIP query set variable LOGLEVEL = 7; Set the log level to that you have in the admin tool Now run your BIP report. With the prefix in place; BIServer will write to the NQQuery.log file. This is located in the ./OracleBI/server/Log directory. In there you are going to find the complete process the BIServer has gone through to try and get the data back for you A quick note, if the BIServer can, its going to hit that great BIEE cache to get your data and you may not see the full log. IF this is the case. Get inot hte Administration page (via the browser login) and clear out your BIP report cursor. Then re-run. This will hopefully help out if you are trying to debug that annoying BIP report that will not run or is getting some strange data. Don't forget to turn that logging level back down once you are done. This will avoid the DBA screaming at you for sucking up all the disk space on the system.

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  • A view from the call center for the Nashville Flood telethon

    - by Rob Foster
    I want to break away from my usual topic of something technical and talk about what I experienced tonight while working in the call center for the Nashville Flood telethon, which was broadcast on WSMV, CNN, and The Weather Channel.  We started receiving calls about 7pm local time and to be honest, I had no idea what to expect when going into this.  I mean, I'm a pretty good talker, but this is different...We had a good script of what to say and how we were supposed to say it, as well as paper forms and pens that we used to collect information from people who wanted to donate their money to help.  I took my first few calls pretty easily and it went pretty quick and easy.  Everyone was upbeat and happy to be in the call center as well as people happy to be donating money. Pizza, snacks, and soft drinks were flowing well.  Everyone is smiling and happy.  :) About 3 or 4 calls into my night, I got a call from a lady that had lost 2 family members in West Nashville who drowned in the floods.  She was crying when she called and I of course tried to console her.  She told me how bad her situation was, losing family members and much of her neighborhood.  After all this, she still just wanted to help other people.  She was donating all the money that she could to the telethon and I want to share a direct quote from her: "I want to donate this instead of buying flowers for my family members' funeral because people out there need help.". Please let me pause while I get myself together <again>.  That caught me so off guard (and still does). I had kids calling wanting to donate their allowance, open their piggy banks, whatever they could do.  These are kids.  Kids not much older than my boys.  Kids who should be focused on buying the next cool video game or toy or whatever but wanted to do something.  Everyone just seemed to want to help. I took calls from as far away as British Columbia as well and pretty much coast to coast.  how cool is that? Yet another thing that caught me off guard.  This kind lady that called from British Columbia told me how much she loved visiting Nashville and just hated to see this happen.  I belive that she said that she will be attending the CMA Fest this year too.  I was sure to tell her not to cancel her plans!  :) It felt like every call I took (and I took A LOT, as did everyone else) was very personal and heartfelt.  I've never had the privelage to do anything like this and fell lucky to have been able to help out with answering phones and logging donations.  Nashville will bounce back very quickly, people are out there day and night helping each other, and the spirits are very high here.  I hope that one day, my kids read this blog and better understand who they are, where they come from, and what the human spirt is and can be.  I love this city, I love the people here, I love the culture and even more than ever am proud to say that this is me.  This is us.  We are Nashville!

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  • emo-framework in android move on collision of sprites with physics

    - by KaHeL
    I'm developing my first ever game for Android where I'm still learning about using of framework. To begin I made two sprites of ball where one ball is movable by dragging and another one is just standing on it's place on load. Now I've already added the collision listener for both sprites and as tested it's working properly. Now what I need to learn is on how can I add physics on both sprites where when they collide the standing sprite will move based on the physics and bounce around the screen. It would be best if you teach it to me step by step since I'm a little slow on this. Here's my nut so far: local stage = emo.Stage(); class Okay_1 { sprite = null; spriteok = null; dragStart = false; angle = 0; // Called when the stage is loaded function onLoad() { print("Level_1 is loaded!"); // Create new sprite and load 'f1.png' sprite = emo.Sprite("f1.png"); sprite.moveCenter(stage.getWindowWidth() * 0.5, stage.getWindowHeight() * 0.5); sprite.load(); spriteok = emo.Sprite("okay.png") spriteok.setWidth(100); spriteok.setHeight(100); spriteok.load(); // Check if the coordinate (X=100, Y=100) is inside the sprite if (spriteok.contains(100, 100)) { print("contains!"); } // Does the sprite collides with the other sprite? if (spriteok.collidesWith(sprite)) { print("collides!"); } } function onMotionEvent(ev) { if (ev.getAction() == MOTION_EVENT_ACTION_DOWN) { // Moves the sprite at the position of motion event angle = sprite.getAngle(); sprite.remove(); sprite = emo.Sprite("f2.png"); sprite.load(); sprite.rotate(angle); sprite.moveCenter(ev.getX(), ev.getY()); sprite.rotate(sprite.getAngle()+10); // Check if the coordinate (X=100, Y=100) is inside the sprite if (sprite.contains(sprite.getWidth(), sprite.getHeight())) { print("contains!"); } // Does the sprite collides with the other sprite? if (sprite.collidesWith(spriteok)) { print("collides!"); } dragStart = true; }else if (ev.getAction() == MOTION_EVENT_ACTION_MOVE) { if (dragStart) { // Moves the sprite at the position of motion event sprite.moveCenter(ev.getX(), ev.getY()); sprite.rotate(sprite.getAngle()+10); // Check if the coordinate (X=100, Y=100) is inside the sprite if (sprite.contains(sprite.getWidth(), sprite.getHeight())) { print("contains!"); } // Does the sprite collides with the other sprite? if (sprite.collidesWith(spriteok)) { print("collides!"); } } }else if (ev.getAction() == MOTION_EVENT_ACTION_UP || ev.getAction() == MOTION_EVENT_ACTION_CANCEL) { if (dragStart) { // change block color to red dragStart = false; angle = sprite.getAngle(); sprite.remove(); sprite = emo.Sprite("f1.png"); sprite.load(); sprite.moveCenter(ev.getX(), ev.getY()); sprite.rotate(angle); // Check if the coordinate (X=100, Y=100) is inside the sprite if (sprite.contains(sprite.getWidth(), sprite.getHeight())) { print("contains!"); } // Does the sprite collides with the other sprite? if (sprite.collidesWith(spriteok)) { print("collides!"); } } } } // Called when the stage is disposed function onDispose() { sprite.remove(); // Remove the sprite print("Level_1 is disposed!"); } } function emo::onLoad() { emo.Stage().load(Okay_1()); }

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  • ArchBeat Link-o-Rama Top 10 for September 2-8, 2012

    - by Bob Rhubart
    The Top 10 items shared on the OTN Facebook Page for the week of September 2-8, 2012. Adding a runtime LOV for a taskflow parameter in WebCenter | Yannick Ongena Oracle ACE Yannick Ongena illustrates how to customize the parameters tab for a taskflow in WebCenter. Tips on Migrating from AquaLogic .NET Accelerator to WebCenter WSRP Producer for .NET | Scott Nelson "It has been a very winding path and this blog entry is intended to share both the lessons learned and relevant approaches that led to those learnings," says Scott Nelson. "Like most journeys of discovery, it was not a direct path, and there are notes to let you know when it is practical to skip a section if you are in a hurry to get from here to there." Free Event: Oracle Technology Network Architect Day – Boston, MA – 9/12/2012 Sure, you could ask a voodoo priestess for help in improving your solution architecture skills. But there's the whole snake thing, and the zombie thing, and other complications. So why not keep it simple and register for Oracle Technology Network Architect Day in Boston, MA. There's no magic, just a full day of technical sessions covering Cloud, SOA, Engineered Systems, and more. Registration is free, but seating is limited. You'll curse yourself if you miss this one. Starting and Stopping Fusion Applications the Right Way | Ronaldo Viscuso While the fastartstop tool that ships with Oracle Fusion Applications does most of the work to start/stop/bounce the Fusion Apps environment, it does not do it all. Oracle Fusion Applications A-Team blogger Ronaldo Viscuso's post "aims to explain all tasks involved in starting and stopping a Fusion Apps environment completely." Article Index: Architect Community Column in Oracle Magazine Did you know that Oracle Magazine features a regular column devoted specifically to the architect community? Every issue includes insight and expertise from architects who regularly work with Oracle Technologies. Click here to see a complete list of these articles. Using FMAP and AnalyticsRes in a Oracle BI High Availability Implementation | Art of Business Intelligence "The fmap syntax has been used for a long time in Oracle BI / Siebel Analytics when referencing images inherent in the application as well as custom images," says Oracle ACE Christian Screen. "This syntax is used on Analysis requests an dashboards." Dodeca Customer Feedback - The Rosewood Company | Tim Tow Oracle ACE Director Tim Tow shares anecdotal comments from one of his clients, a company that is deploying Dodeca to replace an aging VBA/Essbase application. Configuring UCM cache to check for external Content Server changes | Martin Deh Oracle WebCenter and ADF A-Team blogger shares the background information and the solution to a recently encountered customer scenario. Attend OTN Architect Day in Los Angeles – by Architects, for Architects – October 25 The OTN Architect Day roadshow stops in Boston next week, then it's on to Los Angeles for another all architecture, all day event on Thursday October 25, 2012 at the Sofitel Los Angeles, 555 Beverly Boulevard, Los Angeles, CA 90048. Like all Architect Day events, this one is absolutley free, so register now. The Role of Oracle VM Server for SPARC In a Virtualization Strategy New OTN article from Matthias Pfutzner. Thought for the Day "Practicing architects, through eduction, experience and examples, accumulate a considerable body of contextual sense by the time they're entrusted with solving a system-level problem…" — Eberhardt Rechtin (January 16, 1926 – April 14, 2006) Source: SoftwareQuotes.com

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  • My Favorite Free Windows Phone Twitter App

    - by Tim Murphy
    Windows Phone 7 has been out for about two years now.  In that time I have switched back and forth with different free Twitter apps.  Mostly the has been because someone has mentioned one or another that they like.  I figured I would give a quick run down of what I felt were the pros and cons of each.  These are only the ones that I have used and your mileage may vary.  So here we go. WP7 Built-In Twitter Functionality While it is great that Microsoft put this functionality in, it is extremely limited in usefulness.  Some apps leverage it to allow you to share pictures or information they contain.  In all though, I don’t use it unless it is the quickest way to get something out. Official Twitter App The official Twitter app isn’t a very big step up from the phone functionality.  It gives you a better timeline view and better attachment handling, but it makes you bounce to a browser page to see images that are linked to a tweet. TweetCaster This was my main Twitter app for quite a while.  It is the only one with InstaPaper integration so that you can save you a tweet and review it later.  My main problem is that it crashes too much when it can’t find a connection.  It also only previews yfrog and twitpic images and only once you go to the detail of a tweet.  Other than that it is a solid Twitter client. moTweets This is my current favorite. It has nice image display in your timeline which I have not seen on any of the other apps.  There are two modes that you can use with this app.  The first is standard to most Twitter apps that allows you to navigate to a tweet and do the usual operations.  The second is what they call Quick Buttons.  In this case you do not see the content of the tweet but go straight to the let’s get something done stage.  It is an interesting take.  I do miss the Instapaper integration and it has a tendency to show a blank timeline list once in a while after you view detail entry.  If you scroll the list it restore your timeline, but you lose you place and are put to the first entry. Seesmic I am not very fond of this app.  The first thing is that it makes you pick a “Space” when you enter the app.  This is really “which account do you want to see”.  On top of that it does not show who retweeted an entry in your timeline and then only tells you how many people RT the post when you look at the detail.  There is a Speak feature that will read you a single tweet, but you have to navigate to the tweet and then to a menu to make it work.  We will have to see if this gets better with the features in Windows Phone 8.  Other than that it is another basic feature app.  Summary In the end I am sticking with moTweets.  I would appreciate it if they added the Instapaper capability and fixed the one bug.  If they did that I would be really happy with the product. del.icio.us Tags: Twitter,Windows Phone 7,WP7,TweetCaster,moTweets,Seesmic

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  • Game Design Dilemma

    - by Chris Williams
    I'm working on a 2d tilemapped RPG. I've actually made quite a fair amount of progress, but I'm at a point where I need to make a UI decision. I have the overland world completely mapped out, and I have several towns and special areas. I'm on the fence about how to integrate the two. Scenario 1: I have one ginormous map, where everything is the same scale. This means you can walk in and out of towns without having to load or wait and transition in any way. With everything the same scale, movement costs the same no matter where you are (in terms of time/turns/energy/hunger/whatever/etc...)  The potential downside to this is that it could take quite a long time to get anywhere on foot. Scenario 2: I have an overland map, a set of town maps, overland tactical maps, dungeon maps & special area maps. The overland map is at a different scale than the other maps. This means that time/turns/energy/hunger/whatever/etc is calculated at a different rate than on the other maps, which have a 1:1 scale. When entering a town, dungeon, special area or having a random encounter, you would effectively zoom in from the overland scale to the tactical scale. When you are done with combat, or exit a dungeon or town, it would zoom back out to the overland map. The downside to this is that at the zoomed out scale, the overland map isn't all that big (comparitively) and you can traverse it fairly quickly (in real time, not game world time.) Options: 1) Go with scenario 1, as is. 2) Go with scenario 1 and introduce a slightly speedier version of overland travel, such as a horse. 3) Go with scenario 1 and introduce "instant" travel, via portals or some kind of "click the big map" mechanism. This would only work with places you've already been, or somehow unlocked (perhaps via a quest.) 4) Go with Scenario 2, as is.   Thoughts, opinions, suggestions?  Feedback appreciated.

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  • How To Rip a Music CD in Windows 7 Media Center

    - by DigitalGeekery
    If you’re a Media Center user, you already know that it can play and manage your digital music collection. But, did you know you can also rip a music CD in Windows 7 Media Center and have it automatically added to your music library? Rip a CD in Windows 7 Media Center Place your CD into your optical drive. From within Windows Media Center, open the Music Library and select the CD. If you haven’t previously ripped a CD in Windows 7 with either Windows Media Center or Windows Media Player, you’ll be prompted to select whether or not you’d like to add copy protection. Click Next. By default, your CD will be ripped to .WMA format. The rip settings for Windows Media Center are pulled from Windows Media Player. So to change the rip settings, we’ll need to do so in Media Player. Click Finish. From within Windows Media Player, click on Tools from Menu bar, and select Options. If you are new to Windows Media Player 12, check out our beginner’s guide on how to manage your music with WMP 12. Select the Rip Music tab and choose your output format from the Format drop down list. You can also select the Audio quality (bit rate) by moving the slider bar under Audio quality. Click OK when you are finished.   Now, you are ready to rip your CD. Click on Rip CD. Click Yes to confirm you want to rip the CD. You can follow the progress as each track is being converted.    When the CD is finished you’re ready to start enjoying your music any time you wish in Windows 7 Media Center. Looking for some more tasks you can perform in Media Center with just a remote? Check out our earlier post on how to crop, edit, and print photos in Windows Media Center. Similar Articles Productive Geek Tips Using Netflix Watchnow in Windows Vista Media Center (Gmedia)Fixing When Windows Media Player Library Won’t Let You Add FilesStartup Customizations for Media Center in Windows 7Schedule Updates for Windows Media CenterIntegrate Hulu Desktop and Windows Media Center in Windows 7 TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips DVDFab 6 Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 OutlookStatView Scans and Displays General Usage Statistics How to Add Exceptions to the Windows Firewall Office 2010 reviewed in depth by Ed Bott FoxClocks adds World Times in your Statusbar (Firefox) Have Fun Editing Photo Editing with Citrify Outlook Connector Upgrade Error

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  • An increase to 3 Gig of RAM slows down Ubuntu 10.04 LTS

    - by williepabon
    I have Ubuntu 10.04 running from an external hard drive (installed on an enclosure) connected via USB port. Like a month or so ago, I increased RAM on my pc from 2 Gigs to 3 Gigs. This resulted on extremely long boot times and slow application loads. While I was understanding the nature of my problem, I posted various threads on this forum ( Questions # 188417, 188801), where I was advised to gather speed tests, and other info on my machine. I was also suggested that I might have problems with the RAM installed. Initially, I did not consider that possibility because: 1) I did a memory test with a diagnostic program from DELL (My pc is from Dell) 2) My pc works fine with Windows XP (the default OS), no problems with memory 3) My pc works fine when booting with Ubuntu 10.10 memory stick, no speed problems 4) My pc works fine when booting with Ubuntu 11.10 memory stick, no speed problems Anyway, I performed the memory tests suggested. But before doing it, and to check out any possibility of hardware issues on the hard drive, I did the following: (1) purchased a new hard drive enclosure and moved my hard drive to it, (2) purchased a new USB cable and used it to connect my hard drive/enclosure setup to a different USB port on my pc. Then, I performed speed tests with 1 Gig, 2 Gigs and 3 Gigs of RAM with my Ubuntu 10.04 OS. Ubuntu 10.04 worked well when booted with 1 Gig or 2 Gigs of RAM. When I increased to 3 Gigs, it slowed down to a crawl. I can't understand the relationship between an increase of 1 Gig and the effect it has in Ubuntu 10.04. This doesn't happen with Ubuntu 10.10 and 11.10. Unfortunately for me, Ubuntu 10.04 is my principal work operating system. So, I need a solution for this. Hardware and system information: DELL Precision 670 2 internal SATA Hard drives Audigy 2 ZS audio system Factory OS: Windows XP Professional SP3 NVidia 8400 GTS video card More info: williepabon@WP-WrkStation:~$ uname -a Linux WP-WrkStation 2.6.32-38-generic #83-Ubuntu SMP Wed Jan 4 11:13:04 UTC 2012 i686 GNU/Linux williepabon@WP-WrkStation:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 10.04.4 LTS Release: 10.04 Codename: lucid Speed test with the 3 Gigs of RAM installed: williepabon@WP-WrkStation:~$ sudo hdparm -tT /dev/sdc [sudo] password for williepabon: /dev/sdc: Timing cached reads: 84 MB in 2.00 seconds = 41.96 MB/sec Timing buffered disk reads: 4 MB in 3.81 seconds = 1.05 MB/sec This is a very slow transfer rate from a hard drive. I will really appreciate a solution or a work around for this problem. I know that that there are users that have Ubuntu 10.04 with 3 Gigs or more of RAM and they don't have this problem. Same question asked on Launchpad for reference.

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  • Predicting Likelihood of Click with Multiple Presentations

    - by Michel Adar
    When using predictive models to predict the likelihood of an ad or a banner to be clicked on it is common to ignore the fact that the same content may have been presented in the past to the same visitor. While the error may be small if the visitors do not often see repeated content, it may be very significant for sites where visitors come repeatedly. This is a well recognized problem that usually gets handled with presentation thresholds – do not present the same content more than 6 times. Observations and measurements of visitor behavior provide evidence that something better is needed. Observations For a specific visitor, during a single session, for a banner in a not too prominent space, the second presentation of the same content is more likely to be clicked on than the first presentation. The difference can be 30% to 100% higher likelihood for the second presentation when compared to the first. That is, for example, if the first presentation has an average click rate of 1%, the second presentation may have an average CTR of between 1.3% and 2%. After the second presentation the CTR stays more or less the same for a few more presentations. The number of presentations in this plateau seems to vary by the location of the content in the page and by the visual attraction of the content. After these few presentations the CTR starts decaying with a curve that is very well approximated by an exponential decay. For example, the 13th presentation may have 90% the likelihood of the 12th, and the 14th has 90% the likelihood of the 13th. The decay constant seems also to depend on the visibility of the content. Modeling Options Now that we know the empirical data, we can propose modeling techniques that will correctly predict the likelihood of a click. Use presentation number as an input to the predictive model Probably the most straight forward approach is to add the presentation number as an input to the predictive model. While this is certainly a simple solution, it carries with it several problems, among them: If the model learns on each case, repeated non-clicks for the same content will reinforce the belief of the model on the non-clicker disproportionately. That is, the weight of a person that does not click for 200 presentations of an offer may be the same as 100 other people that on average click on the second presentation. The effect of the presentation number is not a customer characteristic or a piece of contextual data about the interaction with the customer, but it is contextual data about the content presented. Models tend to underestimate the effect of the presentation number. For these reasons it is not advisable to use this approach when the average number of presentations of the same content to the same person is above 3, or when there are cases of having the presentation number be very large, in the tens or hundreds. Use presentation number as a partitioning attribute to the predictive model In this approach we essentially build a separate predictive model for each presentation number. This approach overcomes all of the problems in the previous approach, nevertheless, it can be applied only when the volume of data is large enough to have these very specific sub-models converge.

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  • Link To Work Item &ndash; Visual Studio extension to link changeset(s) to work item directly from VS history window

    - by Utkarsh Shigihalli
    Originally posted on: http://geekswithblogs.net/onlyutkarsh/archive/2014/08/11/link-to-work-item-ndash-visual-studio-extension-to-link.aspxBy linking work items and other objects, you can track related work, dependencies, and changes made over time. As the following illustration shows, specific link types are used to track specific work items and actions. (– via MSDN) While making a check-in, Visual Studio 2013 provides you a quick way to search and assign a work item via pending changes section in Team Explorer. However, if you forget to assign the work item during your check-in, things really get cumbersome as Visual Studio does not provide an easy way of assigning. For example, you usually have to open the work item and then link the changeset which involves approx. 7-8 mouse clicks. Now, you will really feel the difficulty if you have to assign work item to multiple changesets, you have to repeat the same steps again. Hence, I decided to develop a small Visual Studio extension to perform this action of linking work item to changeset bit easier. How to use the extension? First, download and install the extension from VS Gallery (Supports VS 2013 Professional and above). Once you install, you will see a new "Link To Work Item" menu item when you right click on a changeset in history window. Clicking Link To Work Item menu, will open a new dialog with which you can search for a work item. As you can see in below screenshot, this dialog displays the search result and also the type of the work item. You can also open work item from this dialog by right clicking on the work item and clicking 'Open'. Finally, clicking Save button, will actually link the work item to changeset. One feature which I think helpful, is you can select multiple changesets from history window and assign the work item to all those changesets.  To summarize the features Directly assign work items to changesets from history window Assign work item to multiple changesets Know the type of the work item before assigning. Open the work item from search results It also supports all default Visual Studio themes. Below is a small demo showcasing the working of this extension. Finally, if you like the extension, do not forget to rate and review the extension in VS Gallery. Also, do not hesitate to provide your suggestions, improvements and any issues you may encounter via github.

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  • 3 Day Level 400 SQL Tuning Workshop 15 March in London, early bird and referral offer

    - by sqlworkshops
    I want to inform you that we have organized the "3 Day Level 400 Microsoft SQL Server 2008 and SQL Server 2005 Performance Monitoring & Tuning Hands-on Workshop" in London, United Kingdom during March 15-17, 2011.This is a truly level 400 hands-on workshop and you can find the Agenda, Prerequisite, Goal of the Workshop and Registration information at www.sqlworkshops.com/ruk. Charges are GBP 1800 (VAT excl.). Early bird discount of GBP 125 until 18 February. We are also introducing a new referral plan. If you refer someone who participates in the workshop you will receive an Amazon gift voucher for GBP 125.Feedback from one of the participants who attended our November London workshop:Andrew, Senior SQL Server DBA from UBS, UK, www.ubs.com, November 26, 2010:Rating: In a scale of 1 to 5 please rate each item below (1=Poor & 5=Excellent) Overall I was satisfied with the workshop 5 Instructor maintained the focus of the course 5 Mix of theory and practice was appropriate 5 Instructor answered the questions asked 5 The training facility met the requirement 5 How confident are you with SQL Server 2008 performance tuning 5 Additional comments from Andrew: The course was expertly delivered and backed up with practical examples. At the end of the course I felt my knowledge of SQL Server had been greatly enhanced and was eager to share with my colleagues. I felt there was one prerequisite missing from the course description, an open mind since the course changed some of my core product beliefs. For Additional workshop feedbacks refer to: www.sqlworkshops.com/feedbacks.I will be delivering the Level 300-400 1 Day Microsoft SQL Server 2008 Performance Monitoring and Tuning Seminar at Istanbul and Ankara, Turkey during March. This event is organized by Microsoft Turkey, let me know if you are in Turkey and would like to attend.During September 2010 I delivered this Level 300-400 1 Day Microsoft SQL Server 2008 Performance Monitoring and Tuning Seminar in Zurich, Switzerland organized by Microsoft Switzerland and the feedback was 4.85 out of 5, there were about 100 participants. During November 2010 when I delivered seminar in Lisbon, Portugal organized by Microsoft Portugal, the feedback was 8.30 out of 9, there were 130 participants.Our Mission: Empower customers to fully realize the Performance potential of Microsoft SQL Server without increasing the total cost of ownership (TCO) and achieve high customer satisfaction in every consulting engagement and workshop delivery.Our Business Plan: Provide useful content in webcasts, articles and seminars to get visibility for consulting engagements and workshop delivery opportunity. Help us by forwarding this email to your SQL Server friends and colleagues.Looking forwardR Meyyappan & Team @ www.SQLWorkshops.comLinkedIn: http://at.linkedin.com/in/rmeyyappan

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  • A Plea for Plain English

    - by Tony Davis
    The English language has, within a lifetime, emerged as the ubiquitous 'international language' of scientific, political and technical communication. On the one hand, learning a single, common language, International English, has made it much easier to participate in and adopt new technologies; on the other hand it must be exasperating to have to use English at international conferences, or on community sites, when your own language has a long tradition of scientific and technical usage. It is also hard to master the subtleties of using a foreign language to explain advanced ideas. This requires English speakers to be more considerate in their writing. Even if you’re used to speaking English, you may be brought up short by this sort of verbiage… "Business Intelligence delivering actionable insights is becoming more critical in the enterprise, and these insights require large data volumes for trending and forecasting" It takes some imagination to appreciate the added hassle in working out what it means, when English is a language you only use at work. Try, just to get a vague feel for it, using Google Translate to translate it from English to Chinese and back again. "Providing actionable business intelligence point of view is becoming more and more and more business critical, and requires that these insights and projected trends in large amounts of data" Not easy eh? If you normally use a different language, you will need to pause for thought before finally working out that it really means … "Every Business Intelligence solution must be able to help companies to make decisions. In order to detect current trends, and accurately predict future ones, we need to analyze large volumes of data" Surely, it is simple politeness for English speakers to stop peppering their writing with a twisted vocabulary that renders it inaccessible to everyone else. It isn’t just the problem of writers who use long words to give added dignity to their prose. It is the use of Colloquial English. This changes and evolves at a dizzying rate, adding new terms and idioms almost daily; it is almost a new and separate language. By contrast, ‘International English', is gradually evolving separately, at its own, more sedate, pace. As such, all native English speakers need to make an effort to learn, and use it, switching from casual colloquial patter into a simpler form of communication that can be widely understood by different cultures, even if it gives you less credibility on the street. Simple-Talk is based, at least in part, on the idea that technical articles can be written simply and clearly in a form of English that can be easily understood internationally, and that they can be written, with a little editorial help, by anyone, and read by anyone, regardless of their native language. Cheers, Tony.

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  • Friday Fun: Snow Crusher

    - by Asian Angel
    It has probably been a long week whether you have already returned to work or are finishing up the last of your vacation time. If you are in need of some stress relief, then we have we the perfect game for you. This week you get to be totally fiendish and use a monster size snowball to destroy as many cars as possible at the local snow lodge. Snow Crusher The object of the game is simple…create as large of a monster snowball as you can and then send it down over the side of the mountain to destroy the cars at the snow lodge. You can choose from three different sizes of monster snowballs to create. We chose the “Snowflake Size” for our reign of destruction. Once you have chosen a monster snowball size, all that is left to do is select the control method that works best for you. As soon as you select the control method, your monster snowball creation will automatically begin. Keep in mind that the faster your snowball goes the harder it can become to steer if you make sudden movements… At the top you can watch your progress towards the drop-off point and the green boxes highlighted at the bottom indicate how large of an item (such as trees or boulders) your snowball can roll over and add to the total mass. Snowball speed is shown in the lower right corner. Time to roll! As soon as the first green box is lit up you can start adding small trees to your snowball’s mass. You will want to avoid larger items as you go because they will penalize your score, slow you down, and reduce the size of your snowball! Halfway to the drop-off point and our snowball is now able to grab up larger trees. If you have not hit any large items along the way, your snowball will definitely be moving along at a good rate by now. When you reach the end of the mass building area, your snowball will pop out into the open and get ready to drop off over the side of the mountain. Go snowball go! Yes! Thirteen cars crushed and ready for the scrap yard… If the “Snowflake Size” snowball can do this, just think what the “Avalanche Size” can do with three minutes of time to build up mass! Have fun with those monster snowballs! Play Snow Crusher Latest Features How-To Geek ETC The 20 Best How-To Geek Linux Articles of 2010 The 50 Best How-To Geek Windows Articles of 2010 The 20 Best How-To Geek Explainer Topics for 2010 How to Disable Caps Lock Key in Windows 7 or Vista How to Use the Avira Rescue CD to Clean Your Infected PC The Complete List of iPad Tips, Tricks, and Tutorials Classic Super Mario Brothers Theme for Chrome and Iron Experimental Firefox Builds Put Tabs on the Title Bar (Available for Download) Android Trojan Found in the Wild Chaos, Panic, and Disorder Wallpaper Enjoy Christmas Beyond the Holiday with Christmas Eve Crisis Parrotfish Extends the Number of Services Accessible in Twitter Previews

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  • Add Global Hotkeys to Windows Media Player

    - by DigitalGeekery
    Do you use Windows Media Player in the background while working in other applications? The WMP Keys plug-in for Media Player adds global keyboard shortcuts that allow you to control Media Player even when it isn’t in focus. Windows Media Player has a slew of keyboard shortcuts that work only when the media player is active, but these shortcuts stop working once WMP is no longer in focus or minimized. WMP Keys add the following default global hotkeys for Windows Media Player 10, 11, and 12. Ctrl+Alt+Home – Play / Pause Ctrl+Alt+Right – Next track Ctrl+Alt+Left – Previous track Ctrl+Alt+Up Arrow Key – Volume Up Ctrl+Alt+Down Arrow Key – Volume Down Ctrl+Alt+F – Fast Forward Ctrl+Alt+B – Fast Backward Ctrl+Alt+[1-5] – Rate 1-5 stars Note: Tapping Ctrl+Alt+F and Ctrl+Alt+B will skip ahead or back in 5 second intervals. Close out of Windows Media Player and then download and install WMP Keys (link below). After you’ve installed WMP Keys, you’ll need to enable it. Select Organize and then Options… In the Options window, select the Plug-ins tab, click Background in the Category window, then check the box for Wmpkeys Plugin. Click OK to save and exit. You can also enable the plug-in by selecting Tools > Plug-ins and clicking Wmpkeys Plugin. You to view and edit the global hotkeys in the WMPKeys settings window. Select Tools > Plug-in properties and click Wmpkeys Plugin. Below you can see all the default WMP Keys shortcuts.   To change any of the shortcuts, select the text box then press the new keyboard shortcut. Click OK when finished. WMP Keys is very simple little plug-in that makes using WMP while you’re multitasking just a little bit easier and more efficient.  Looking for more plugins for Windows Media Player? Check out our previous articles on adding new features with Media Player Plus, and displaying song lyrics with Lyrics Plugin. Download WMP Keys Similar Articles Productive Geek Tips Built-in Quick Launch Hotkeys in Windows VistaFixing When Windows Media Player Library Won’t Let You Add FilesKantaris is a Unique Media Player Based on VLCInstall and Use the VLC Media Player on Ubuntu LinuxAssign Keyboard Media Keys to Work in Winamp TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips HippoRemote Pro 2.2 Xobni Plus for Outlook All My Movies 5.9 CloudBerry Online Backup 1.5 for Windows Home Server XPS file format & XPS Viewer Explained Microsoft Office Web Apps Guide Know if Someone Accessed Your Facebook Account Shop for Music with Windows Media Player 12 Access Free Documentaries at BBC Documentaries Rent Cameras In Bulk At CameraRenter

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  • How Microsoft listens

    - by Stacy Vicknair
    This being my freshman year as an MVP, I had a realization that I perhaps should be embarrassed hasn’t happened sooner. The realization comes much like the iconic M&Ms commercial where the M&Ms run into Santa and exclaim, “He does exist!” My personal realization arguably has a greater implication: Microsoft does listen. This is the most important lesson that I received this year attending the MVP Summit. My hope is that I can convince you that we are empowered to make a difference. Instead of using “Man I hate how this works / doesn’t work!” as cooler conversation, we can use it as true interaction with Microsoft. We as customers to Microsoft need to stop asking the question “Will this work for me?” and instead ask “How can this work for me?” There are three quick resources that the average developer has access to today that they can use to be heard by the product teams, and by no means should you think twice if you have a concern that you’d like a real response on. MVPs MVPs are members of your community who have a deep relationship with Microsoft and will have connections to their associated product group. Don’t think of them as just a resource for answers, but also as your ambassador for getting your experiences heard. You can find your local MVPs by browsing the directory at: https://mvp.support.microsoft.com/communities/mvp.aspx Evangelists Evangelists are employees of Microsoft who work to foster and grow communities in their assigned region. They are first-class citizens of Microsoft and are often deeply involved with the product groups. As a result, they will be more than glad to direct your questions or concerns to those who can answer them most expertly. With that said, evangelists are also very busy people (who do amazing things for the community) and might not be able to get you that conversation as quickly as a local MVP. You can find your local evangelist at the following website: http://msdn.microsoft.com/en-us/bb905078.aspx Microsoft Connect This is one of the resources that I haven’t used enough, but it cannot be understated. Connect is the starting point of the social conversation that happens between Microsoft and the community daily. Connect acts as a portal where you can provide new feedback as well as comment and rate the feedback provided by others. Power is in numbers when it comes to Connect, so the exposure that your feedback can get not only lets you know that you aren’t the only one who wants change, but also lets Microsoft know the same. https://connect.microsoft.com   Technorati Tags: Microsoft,MVP,Feedback,Connect

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  • Is your test method self-validating ?

    - by mehfuzh
    Writing state of art unit tests that can validate your every part of the framework is challenging and interesting at the same time, its like becoming a samurai. One of the key concept in this is to keep our test synced all the time as underlying code changes and thus breaking them to the furthest unit as possible.  This also means, we should avoid  multiple conditions embedded in a single test. Let’s consider the following example of transfer funds. [Fact] public void ShouldAssertTranserFunds() {     var currencyService = Mock.Create<ICurrencyService>();     //// current rate     Mock.Arrange(() => currencyService.GetConversionRate("AUS", "CAD")).Returns(0.88f);       Account to = new Account { Currency = "AUS", Balance = 120 };     Account from = new Account { Currency = "CAD" };       AccountService accService = new AccountService(currencyService);       Assert.Throws<InvalidOperationException>(() => accService.TranferFunds(to, from, 200f));       accService.TranferFunds(to, from, 100f);       Assert.Equal(from.Balance, 88);     Assert.Equal(20, to.Balance); } At first look,  it seems ok but as you look more closely , it is actually doing two tasks in one test. At line# 10 it is trying to validate the exception for invalid fund transfer and finally it is asserting if the currency conversion is successfully made. Here, the name of the test itself is pretty vague. The first rule for writing unit test should always reflect to inner working of the target code, where just by looking at their names it is self explanatory. Having a obscure name for a test method not only increase the chances of cluttering the test code, but it also gives the opportunity to add multiple paths into it and eventually makes things messy as possible. I would rater have two test methods that explicitly describes its intent and are more self-validating. ShouldThrowExceptionForInvalidTransferOperation ShouldAssertTransferForExpectedConversionRate Having, this type of breakdown also helps us pin-point reported bugs easily rather wasting any time on debugging for something more general and can minimize confusion among team members. Finally, we should always make our test F.I.R.S.T ( Fast.Independent.Repeatable.Self-validating.Timely) [ Bob martin – Clean Code]. Only this will be enough to ensure, our test is as simple and clean as possible.   Hope that helps

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  • How to become a solid python web developer [closed]

    - by Estarius
    Possible Duplicate: How do I learn Python from zero to web development? I have started Python recently with the goal to become a solid developer to make a web application eventually. However, as time goes by I am wondering if I am being optimal about how I will achieve my goal. I would compare it to a game for example, to be better you must spend time playing and trying new things... However, if you just log in and sit in the lobby chatting you are most likely not progressing. So far, this is my plan (feel free to comment or judge it): Review basic programmation concepts Start coding slowly in Python Once comfortable in Python, learn about web development in Python Learn about those things we heard about: SQLAlchemy, MVC, TDD, Git, Agile (Group project) To achieve these things, I started the Learn python the hard way exercises, which I am doing at the rate of 5 per days. I also started to read Think Python at the same time and planning to move on with Dive into python. As far as my research goes, these documentations along with Python documentation is usually what is the most recommended to learn Python. I consider this to get my point 1 and 2 done. While learning Python is really great, my goal remains to do quality web development. I know there are books about Django etc. however I would like to become comfortable with any Python web development. This means without Framework and with Framework... Any framework, then be able to choose the one which best fits our needs. For this I would like to know if some people have suggestions. Should I just get a book on Django and it should apply to everything ? What would be the best method to go from Python to Web Python and not end up creating crappy code which would turn into nightmares for other programmers ? Then finally, those "things we hear about". While I understand what they all do basically, I am fairly sure that like everything, there are good and wrong ways of making use of them. Should I go through at least a whole book on each before starting to use them or keep it at their respective online documentation ? Are there some kind of documentation which links their use to Python ? Also, from looking at Django and Pyramid they seems to use something else than MVC, while the Django model looks similar, the Pyramid one seems to cut a whole part of it... Is learning MVC still worth it ? Sorry for the wall of text, Thanks in advance !

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  • Are You In The Know About Knowledge?

    - by [email protected]
    "Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information on it." To me, this simple and elegant quote from the great English author Samuel Johnson is a reflection of Oracle's knowledge base strategy. The knowledge base in the My Oracle Support portal (https://support.oracle.com) hosts nearly a half million documents, including how-to instructions, problem-solution descriptions, code samples, FAQs, critical alerts, technical whitepapers, and so on. AutoVue's footprint in the Oracle knowledge base - although relatively small at just around 400 documents - is a steadily-expanding assortment of valuable info. This information is designed to complement what you have already learned from the AutoVue documentation, or in some cases, to examine topics not yet covered in the documentation. Similar to the documentation, the knowledge base is one of the highest-value self-service avenues, since it delivers answers in real-time and is driven by the topics most relevant to customers. There are many different ways to leverage the AutoVue knowledge content, or what Oracle often refers to as "KM Notes": 1. Knowledge Browser: To browse the knowledge hierarchy, click on the 'Knowledge' tab at the top of the My Oracle Support webpage. In the list of product areas at the left, click on 'More Applications', then on 'Oracle AutoVue'. From here, you can either view the full set of KM Notes under the AutoVue product family (AutoVue, VueLink, Web Services, Document Print Services, etc) by clicking on 'All of Oracle AutoVue', or you can drill down further by clicking on 'Enterprise Visualization'. 2. Search: To execute simple keyword searches, use the Search bar at the top-right of the My Oracle Support webpage: 3. Advanced Search: Beside the same Search bar at the top-right of the My Oracle Support webpage, click on the 'Advanced' link in order to increase your control over the search string as well as the product to search against: 4. In your Dashboard: By clicking on the 'Customize' link at the top-right of the Dashboard page in My Oracle Support, you can drag & drop multiple "Knowledge Articles" widgets onto your dashboard. Then, click on the pencil icon at the top-right of the widget to customize it by product. This allows you to keep an active monitor on the most recently updated KM Notes across any product: 5. During SR Creation: As you submit a new Service Request, after entering the product information, SR title, and SR description, you will be presented with a frame at the left containing KM Note suggestions based on the information entered: Let Oracle know what you think! If you like or dislike an article, or would like to comment on how easy/difficult it was to find the article, click on the "Rate this document" link at the bottom of the KM Note. Similarly, during SR creation if one of the suggested KM Notes resolves your question/issue, you can click the "This article solved my problem" link at the bottom of the page. I hope these approaches improve your ability find knowledge content within the My Oracle Support portal, and I encourage you to continue to build your knowledge to further your success with the AutoVue product family.

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  • More details on America's Cup use of Oracle Data Mining

    - by charlie.berger
    BMW Oracle Racing's America's Cup: A Victory for Database Technology BMW Oracle Racing's victory in the 33rd America's Cup yacht race in February showcased the crew's extraordinary sailing expertise. But to hear them talk, the real stars weren't actually human. "The story of this race is in the technology," says Ian Burns, design coordinator for BMW Oracle Racing. Gathering and Mining Sailing DataFrom the drag-resistant hull to its 23-story wing sail, the BMW Oracle USA trimaran is a technological marvel. But to learn to sail it well, the crew needed to review enormous amounts of reliable data every time they took the boat for a test run. Burns and his team collected performance data from 250 sensors throughout the trimaran at the rate of 10 times per second. An hour of sailing alone generates 90 million data points.BMW Oracle Racing turned to Oracle Data Mining in Oracle Database 11g to extract maximum value from the data. Burns and his team reviewed and shared raw data with crew members daily using a Web application built in Oracle Application Express (Oracle APEX). "Someone would say, 'Wouldn't it be great if we could look at some new combination of numbers?' We could quickly build an Oracle Application Express application and share the information during the same meeting," says Burns. Analyzing Wind and Other Environmental ConditionsBurns then streamed the data to the Oracle Austin Data Center, where a dedicated team tackled deeper analysis. Because the data was collected in an Oracle Database, the Data Center team could dive straight into the analytics problems without having to do any extract, transform, and load processes or data conversion. And the many advanced data mining algorithms in Oracle Data Mining allowed the analytics team to build vital performance analytics. For example, the technology team could remove masking elements such as environmental conditions to give accurate data on the best mast rotation for certain wind conditions. Without the data mining, Burns says the boat wouldn't have run as fast. "The design of the boat was important, but once you've got it designed, the whole race is down to how the guys can use it," he says. "With Oracle database technology we could compare the incremental improvements in our performance from the first day of sailing to the very last day. With data mining we could check data against the things we saw, and we could find things that weren't otherwise easily observable and findable."

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  • How To Approach 360 Degree Snake

    - by Austin Brunkhorst
    I've recently gotten into XNA and must say I love it. As sort of a hello world game I decided to create the classic game "Snake". The 90 degree version was very simple and easy to implement. But as I try to make a version of it that allows 360 degree rotation using left and right arrows, I've come into sort of a problem. What i'm doing now stems from the 90 degree version: Iterating through each snake body part beginning at the tail, and ending right before the head. This works great when moving every 100 milliseconds. The problem with this is that it makes for a choppy style of gameplay as technically the game progresses at only 6 fps rather than it's potential 60. I would like to move the snake every game loop. But unfortunately because the snake moves at the rate of it's head's size it goes way too fast. This would mean that the head would need to move at a much smaller increment such as (2, 2) in it's direction rather than what I have now (32, 32). Because I've been working on this game off and on for a couple of weeks while managing school I think that I've been thinking too hard on how to accomplish this. It's probably a simple solution, i'm just not catching it. Here's some pseudo code for what I've tried based off of what makes sense to me. I can't really think of another way to do it. for(int i = SnakeLength - 1; i > 0; i--){ current = SnakePart[i], next = SnakePart[i - 1]; current.x = next.x - (current.width * cos(next.angle)); current.y = next.y - (current.height * sin(next.angle)); current.angle = next.angle; } SnakeHead.x += cos(SnakeAngle) * SnakeSpeed; SnakeHead.y += sin(SnakeAngle) * SnakeSpeed; This produces something like this: Code in Action. As you can see each part always stays behind the head and doesn't make a "Trail" effect. A perfect example of what i'm going for can be found here: Data Worm. Not the viewport rotation but the trailing effect of the triangles. Thanks for any help!

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