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• Database design for summarized data

  - by holden

  I have a new table I'm going to add to a bunch of other summarized data, basically to take some of the load off by calculating weekly avgs. My question is whether I would be better off with one model over the other. One model with days of the week as a column with an additional column for price or another model as a series of fields for the DOW each taking a price. I'd like to know which would save me in speed and/or headaches? Or at least the trade off. IE. ID OBJECT_ID MON TUE WED THU FRI SAT SUN SOURCE OR ID OBJECT_ID DAYOFWEEK PRICE SOURCE

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• Is Objective C fast enough for DSP/audio programming

  - by morgancodes

  I've been making some progress with audio programming for iPhone. Now I'm doing some performance tuning, trying to see if I can squeeze more out of this little machine. Running Shark, I see that a significant part of my cpu power (16%) is getting eaten up by objc_msgSend. I understand I can speed this up somewhat by storing pointers to functions (IMP) rather than calling them using [object message] notation. But if I'm going to go through all this trouble, I wonder if I might just be better off using C++. Any thoughts on this?

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• Silverlight 3 Offline Mode

  - by GWLlosa

  Has anyone found that the userbase is more reluctant to install Silverlight 3 Apps in offline mode because they have no control over "where" the app is installed to? I've had a few issues of a similar nature in the past, with 'power users' getting upset that they can't specify install directories. Are there any workarounds? Any way to get the Silverlight offline installs to prompt for specific install locations and the like? The specific reason given is that users want to install apps to remote storage, like a USB stick or something.

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• IPhone like scrolling on Silverlight ListBox

  - by Larsi

  Hi! I need a listbox with IPhone-like functionality for Silverlight. That is, animated scrolling, and click and drag to scroll. Scrolling will continue a bit after the mouse up event based on the "speed" of the dragging. I've search and found no control vendors providing this. So question is how should I build it? I need some hints to get started. There's two parts to this question: Part 1, How to get the animated scrolling of the listbox. Part 2, How to build a "draggable" scrolling, I guess I should put a canvas on top and track the mouseevent, and simulate some physics. Some hints here would have been great. Thanks Larsi.

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• jquery cycle "allowPagerClickBubble: true" not quite working

  - by Shelagh

  Hi all, I want my page anchors to work as menu links so I used this code: $(function() { $('#slideshow').cycle({ slideExpr: 'img', fx: 'fade', speed: 2000, timeout: 4000, pager: '#nav', pagerEvent: 'mouseover', pauseOnPagerHover: true, pagerAnchorBuilder: function(idx, slide) { // return sel string for existing anchor return '#nav li:eq(' + (idx) + ') a'; }, allowPagerClickBubble: true }); }); If you click the right mouse button, you can choose to open the links and they do open just fine but a normal left button click does nothing. The thing is, they WERE working so I went to work on supposedly unrelated parts of the website and at some point the left mouse button click stopped working. Any ideas what I might have done? Left button clicking still works for everything else on the site so its not some global setting. The cycle is here if my explanation is not clear: http://www.mcguirenaturals.ca/index.php Thanks for any help

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• What is the Relative Performance of Pseudo-Class and Custom Selectors?

  - by James Wiseman

  It's my understanding that, in terms of selector speed, that #ID selectors are fastest, followed by element selectors, and then .class selectors. I have always assumed that pseudo-class selectors and custom selectors (those in the form ':selector') are similar to .class selectors, but I realised that I'm just not sure. I realise that this does depend on the complexity of the code within the pseudo-class/custom selector, so I guess I'd like to know the answer with this excluded as factor. Any help would be appreciated. Thanks.

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• C# Audio - How to time stretch (different tempo, same pitch)

  - by heath

  I'm trying to make a winform app in C# (VS2008) that can load an mp3 (other formats would be nice, but mp3 at a minimum) and be able to adjust the playback speed (tempo) without affecting pitch. I really don't need any other audio effects. I tried using DirectShow but that doesn't seem to offer time stretch capabilities. I was able to incorporate irrklang but that does not seem to have the time stretch capability either. So now I've moved on to SoundTouch. That certainly has the capabilities but I'm very unclear on how to implement in C#. After a few days of this, about all I've accomplished is using DLLImport on the SoundTouch DLL and am able to successfully retrieve a version number. At this point, I'm not even sure if I can do what I'm trying to do with SoundTouch. Can anyone offer some guidance either on how to implement SoundTouch or a different library with the capabilities that I'm looking for? Thank you.

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• Using truncate table alongside Hibernate?

  - by Marcus

  Is it OK to truncate tables while at the same time using Hibernate to insert data? We parse a big XML file with many relationships into Hibernate POJO's and persist to the DB. We are now planning on purging existing data at certain points in time by truncating the tables. Is this OK? It seems to work fine. We don't use Hibernate's second level cache. One thing I did notice, which is fine, is that when inserting we generate primary keys using Hibernate's @GeneratedValue where Hibernate just uses a key value one greater than the highest value in the table - and even though we are truncating the tables, Hibernate remembers the prior value and uses prior value + 1 as opposed to starting over at 1. This is fine, just unexpected. Note that the reason we do truncate as opposed to calling delete() on the Hibernate POJO's is for speed. We have gazillions of rows of data, and truncate is just so much faster.

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• autoscrolling for UIScrollView

  - by thndrkiss

  Hi, I used the setContentOffset method to scroll to a particular point automatically without user interaction. [menuScrollView setContentOffset:CGPointMake(600.0,0) animated:YES] but when i try to call the same method in a looping fashion inorder to slow down the speed of scrolling the scrolling never happens for (int i = 1; i<=30; i++) { [menuScrollView setContentOffset:CGPointMake(600.0-i*10,0.0) animated:YES]; NSLog(@"%f",600.0-i*10); } During the above piece of code the scrolling of UIScrollview happens only once (1st iteration( and it does not scroll for remaining 29 interations. What is the problem here ?

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• Why aren't we programming on the GPU???

  - by Chris

  So I finally took the time to learn CUDA and get it installed and configured on my computer and I have to say, I'm quite impressed! Here's how it does rendering the Mandelbrot set at 1280 x 678 pixels on my home PC with a Q6600 and a GeForce 8800GTS (max of 1000 iterations): Maxing out all 4 CPU cores with OpenMP: 2.23 fps Running the same algorithm on my GPU: 104.7 fps And here's how fast I got it to render the whole set at 8192 x 8192 with a max of 1000 iterations: Serial implemetation on my home PC: 81.2 seconds All 4 CPU cores on my home PC (OpenMP): 24.5 seconds 32 processors on my school's super computer (MPI with master-worker): 1.92 seconds My home GPU (CUDA): 0.310 seconds 4 GPUs on my school's super computer (CUDA with static domain decomposition): 0.0547 seconds So here's my question - if we can get such huge speedups by programming the GPU instead of the CPU, why is nobody doing it??? I can think of so many things we could speed up like this, and yet I don't know of many commercial apps that are actually doing it. Also, what kinds of other speedups have you seen by offloading your computations to the GPU?

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• Best DataMining Database

  - by Eric

  I am an ocasional Python programer who only have worked so far with MYSQL or SQLITE databases. I am the computer person for everything in a small compamy and I have been started a new project where I think it is about time to try new databases. Sales departament makes a CSV dump every week and I need to make a small scripting application that allow people form other departaments mixing the information, mostly linking the records. I have all this solved, my problem is the speed, I am using just plain text files for all this and unsurprisingly it is very slow. I thought about using mysql, but then I need installing mysql in every desktop, sqlite is easier, but it is very slow. I do not need a full relational database, just some way of play with big amounts of data in a decent time. Many thanks!

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• Any Flex 4 migration experience?

  - by Gok Demir

  My current development stack is MySQL + iBatis + Spring + Spring BlazeDS Integration 1.01 + BlazeDS 3.2 and Flex 3 with Mate 0.8.9 framework. Now Flash Builder 4 beta 2 is out. There are cool features like Data Centric Development (DCD), form generation etc... Do you know how Spring Blazeds Integration works with BlazeDS 4? What about Mate? Is there any issues with Flex 4 ? How DCD suits with mate eventmaps. I know it is better to try it out myself but I just want to check if somebody ever tried to migrate Flex 4. If so what are the issues? Did you notice any productivity speed up? Thanks.

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• RHEL 5 SCSI ADPATEC

  - by Rajiv Sharma

  HI I have RHEL 5 box . and adpatec scsi card connected to it . I can see the adaptor under dsmeg | grep -i scsi dmesg | grep -i scsi SCSI subsystem initialized scsi0 : SCSI emulation for USB Mass Storage devices Type: CD-ROM ANSI SCSI revision: 00 scsi 0:0:0:0: Attached scsi generic sg0 type 5 sr0: scsi3-mmc drive: 0x/0x caddy sr 0:0:0:0: Attached scsi CD-ROM sr0 scsi1 : Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev 3.0 aic7901: Ultra320 Wide Channel A, SCSI Id=7, PCI-X 101-133Mhz, 512 SCBs Loading iSCSI transport class v2.0-871. iscsi: registered transport (iser) iscsi: registered transport (cxgb3i) Broadcom NetXtreme II iSCSI Driver bnx2i v2.1.0 (Dec 06, 2009) iscsi: registered transport (bnx2i) scsi2 : Broadcom Offload iSCSI Initiator scsi3 : Broadcom Offload iSCSI Initiator iscsi: registered transport (tcp) iscsi: registered transport (be2iscsi) bnx2i: iSCSI not supported, dev=eth0 bnx2i: iSCSI not supported, dev=eth0 bnx2i: iSCSI not supported, dev=eth1 bnx2i: iSCSI not supported, dev=eth1 but cann't see under cat /proc/scsi/scsi cat /proc/scsi/scsi Attached devices: Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: KVM Model: vmDisk-CD Rev: 0.01 Type: CD-ROM ANSI SCSI revision: 02 all st and sg modules are enable. Anyone please help me thanks advance Rajiv

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• Device driver with generic communication media layer

  - by Tom

  Greetings all, I'm trying to implement driver for an embedded device with generic communication media layer. Not sure what is the best way to do it so I'm seeking an advice from more experienced stackoverflow users:). Basically we've got devices around the country communicating with our head office. Usual form of communication is over TCP/IP, but could be also using usb, RF dongle, IR, etc. The plan is to have object corresponding with each of these devices, handling the proprietary protocol on one side and requests/responses from other internal systems on the other. The thing is how create something generic in between the media and the handling objects. I had a play around with the TCP dispatcher using boost.asio but trying to create something generic seems like a nightmare :). Anybody tried to do something like that? What is the best way how to do it? Cheers, Tom

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• ergonomics: what's better; trackball, ergonomic mouse or some other pointing device (a-la touchscree

  - by mauriciopastrana

  So I bit into the hype and recently purchased an apple wireless keyboard and that evil bar-of-soap thing apple makes for a mouse. Couple of hundred dollars later and this is where I begin to worry about RSI. Go figure. Don't get me wrong, this apple mouse is genius and looks pretty as hell, but my right wrist feels tired after a full day's worth of work, so i'm thinking of switching. Anyone out there use a trackball? is this worse? should I get a super-ergonomic mouse instead? I've seen mouse-trackball combos but am not sold, they still elicit the same end-finger behaviour detrimental for RSI, right? I also have a wrist-rest mousepad, but couldn't find one suitable for my keyboard. I've even considered having a small touchscreen where the mousepad should go, no mouse (or alternatively, a usb trackpad). Just looking for ideas, is the trackball better than the mouse? /mp

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• iPhone: launch image for tab app?

  - by Karsten Silz

  I have a tab-based iPhone app where I want to increase the perceived start-up speed with a launch image. As defined by the iPhone HIG, the launch image is a screenshot of your app (called Default.png) that is displayed immediately and looks very similar to the app's first screen (e.g., the screenshot of an empty table when the app displays a table first). Now the problem with a tab-based app is that users can rearrange the order of tabs so that any of the tabs may be the first tab to show upon launch. I think I read somewhere that you can't change the Default.png programmatically in your app, but I couldn't find that in the HIG (and the "Clock" app seems to do exactly that - having one launch image per tab). So, how do provide a launch image for a tab-based app?

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• how do you use ${word_selection} in an Eclipse PDT template?

  - by pocketfullofcheese

  I was recently trying to use some code templates with Eclipse PDT 2.1 to speed up some common tasks. We use a lot of getters/setters, so I wrote the following template. function get${word_selection}() { return $$this->getData('${word_selection}'); } function set${word_selection}($$${word_selection}) { $$this->setData('${word_selection}', $$${word_selection}); } I named the template "getset" and the only way I know to use the Code Assist is to type: "getset" then hit my code assist keys (I have it set to Esc, but I think the default was Ctrl+Space). The problem is, this doesn't actually let me select a word to be used by the ${word_selection}. My question is: how do I type in my template name, hit the key combo, and have a word selected all at the same time?

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• Do Precompiled headers help with rebuilds?

  - by brickner

  I read some of the questions about precompiled headers but couldn't find a direct answer to that. I usually rebuild my entire Visual Studio 2010 solution. One of the projects in my solution is a C++/CLI project. I thought that using precompiled headers in that project will increase the speed of the compilation. After some experiments, it seems that using precompiled headers only slows the rebuild process. Do precompiled headers only help with builds that didn't completely clean the old files?

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• Core Data performance deleteObject and save managed object context

  - by Gary

  I am trying to figure out the best way to bulk delete objects inside of my Core Data database. I have some objects with a parent/child relationship. At times I need to "refresh" the parent object by clearing out all of the existing children objects and adding new ones to Core Data. The 'delete all' portion of this operation is where I am running into trouble. I accomplish this by looping through the children and calling deleteObject for each one. I have noticed that after the NSManagedObjectContext:Save call following all of the deleteObject calls is very slow when I am deleting 15,000 objects. How can I speed up this call? Are there things happening during the save operation that I can be aware of and avoid by setting parameters different or setting up my model another way? I've noticed that memory spikes during this operation as well. I really just want to "delete * from". Thanks.

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• Developing FIrebug like web application for CSS things.

  - by vishwanath

  I am developing a web application for web designing. One part of it includes changing CSS styles on the run and saving the same back to server. I see that, first part of my motive is implemented there in firebug, where I can view CSS style rules applied to a particular HTML element and can change them to view the effect. An earlier question at SO lead to me firebug lite source code https://getfirebug.com/firebug-lite-debug.js , which is far less confusing than full version of firebug. My question was that, is there any way I can get documentation of the firebug/firebug lite code which can speed things up for me. After some googling I found out that there is Firebug API http://getfirebug.com/developer/api/firebug1.6/ But don't know how much useful it is for me. Any alternative way to do this is also welcome.

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• Jquery galleryView loading issues: loader image not displaying, taking awhile

  - by Dustin

  I've got an online portfolio that I'm putting up: Image Gallery I've got a php script that selects at most 15 images from a database that contains the urls for the images. e.g. foreach ($database-result as $img) { echo '<a href="path/to/image/' . $img . '">'; ? When the page first loads, the scroll bar expands as if it is loading invisible images (indeed I think that's what it is doing). Then the javascript kicks in and the gallery loads. I have two questions: first, the image loader is not displaying at all. I don't mind if it takes a bit, as long as the user knows the images are loading. Any ideas why it's not showing up? Second, is there a way to speed up the process? Thanks in advance for the help!

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• Problem with WPF perfomance.

  - by Polaris

  I have form which has many tabs. Every tab has many controls textboxes, comboboxes, datagrids and e .t.c. I bind form to one data source in such way this.DataContext=MyClassInstance But with this way my form opening very slow. about one minute. When I comment above code, form opens very quickly. All My controls I bound to the class properties in XAML. Please tell me the way to bind every tab when it's activated, or bind controls in background thread or any other idea which can help me to speed up my form. Thanks in advance.

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• How can I listen to multiple Serial Ports asynchronously in C#

  - by Kamiel Wanrooij

  I have an application that listens to a piece of hardware on a USB to Serial converter. My application should monitor more than one serial port at the same time. I loop the serial ports I need to listen to, and create a thread for each port. In the thread I have my data handing routine. When I assign one port, it runs flawlessly. When I listen to the other one, it also works. When I open both ports however, the second port always throws an UnauthorizedAccessException when calling serialPort.Open(). It does not matter in what order I open the ports, the second one always fails. I listen to the ports using serialPort.ReadLine() in a while loop. Can .NET open more than one port at the same time? Can I listen to both? Or should I use another (thread safe?) way to access my serial port events?

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• Implementing google dashboard type interface in asp.net

  - by Sam_Cogan

  I'm looking at implementing a Google IG type dashboard in a .net app. There are a number of options I've found to do this, and i'm trying to establish what is going to be the best to use, in terms of speed, versatility etc. So far the options I am looking at are either to use asp.net webparts and .net Ajax, this would make it quicker to build, but I'm concerned this is going to make the application bulky and slow, or using JQuery, and either .net MVC or Webforms, to custom build an interface. Does anyone have any thoughts on what the best option may be, or any options I may have missed? All I want to do here is to allow users to customise a dashboard with a number of components (which will be user controls). I do also have access to Telerik controls, but I'm not sure if they would be any use here.

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• Objective-C : BOOL vs bool

  - by santoni

  Hi, I'm new to objective-c and I saw the "new type" BOOL (YES, NO). I read that this type is almost like a char. For testing I did : NSLog(@"Size of BOOL %d", sizeof(BOOL)); NSLog(@"Size of bool %d", sizeof(bool)); Good to see both display 1 (sometimes in C++ bool just an int and sizeof is 4) So I was just wondering I there were some issues with the bool type or something ? Can I just use bool (that seems to work) without loosing speed? Thanks for answers

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