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  • NHibernate & Cancelling Changes to Entities

    - by user129609
    Hi, This seems like it would be a common issue to be but I don't know the best way to solve it. I want to be able to send an Entity to a view, have changes be made to the entity in the view, but then cancel (remove) those changes if the user cancels out of the view. What is the proper way to do this. Here are two options I have but I think there should be others that are better 1) Take an entity, create a clone, send the clone to the view...if changes are accepted, update the original entity with the clone's values 2) Send the entity to the view, if the user cancels, remove the entity from NHibernate's cache and reload it from the database For (2), the issue for me would be that the old entity could still be referenced throughout my project after it has been removed from the cache.

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  • Saving Blob data from SQLite database to a file

    - by Felipe
    Hello, I'm trying to save blob data from a SQLite database (Safari cache: Cache.db) to a file, but for some reason sqlite won't read the whole blob. I eventually would like to do this in ruby, but for now something that works directly in sqlite command prompt is fine. Also, I've read all of the entries that talk about this here on stackoverflow, but most of them only discuss the performance of saving images in blobs and the one entry that does show to save blobs to file is in C# which does not help me. Here is what I've tried: sqlite select * from cfurl_cache_response limit 1; 3501|0|945281827|0|http://www.gospelz.com/components/com_jomcomment/smilies/guest.gif|2010-02-24 16:20:07 sqlite select receiver_data from cfurl_cache_blob_data where entry_ID = 3501; GIF89a( A hexdump of the original (guest.gif) file shows that sqlite stops reading the blob after the first null value: $ hexdump -C guest.gif 00000000 47 49 46 38 39 61 28 00 28 00 f7 00 00 f1 f5 fd |GIF89a(.(.......| sqlite .output test.gif sqlite select receiver_data from cfurl_cache_blob_data where entry_ID = 3501; $ hexdump -C test.gif 00000000 47 49 46 38 39 61 28 0a |GIF89a(.|

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  • IE8 rendering of local-files is wrong

    - by Eric
    It appears that IE8 is not rendering properly a local file: Consider this simple webpage: http://sayang.free.fr/ie8render.html (html code below) extracted from a w3c tutorial on opacity. Save it locally and display it again: the local file has no opacity! That's very annoying, especially when one wants to design complex pages on prototypes placed in local files. Do you have a solution to that ? <html> <head> <title>IE8 Local File</title> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /> <meta http-equiv="pragma" content="no-cache" /> <meta http-equiv="cache-control" content="no-cache" /> <meta http-equiv="expires" content="-1" /> <style type="text/css"> div.background { width: 500px; height: 250px; background: url(http://www.w3schools.com/css/klematis.jpg) repeat; border: 2px solid black; } div.transbox { width: 400px; height: 180px; margin: 30px 50px; background-color: #ffffff; border: 1px solid black; /* for IE */ filter:alpha(opacity=60); /* CSS3 standard */ opacity:0.6; } div.transbox p { margin: 30px 40px; font-weight: bold; color: #000000; } </style> </head> <body> <h2>Save this file locally and open it to see the difference</h2> <div class="background"> <div class="transbox"> <p>This is some text that is placed in the transparent box. This is some text that is placed in the transparent box. This is some text that is placed in the transparent box. This is some text that is placed in the transparent box. This is some text that is placed in the transparent box.</p> </div> </div> </body> </html>

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  • LINQ to SQL repository - caching data

    - by creativeincode
    I have built my first MVC solution and used the repository pattern for retrieving/inserting/updating my database. I am now in the process of refactoring and I've noticed that a lot of (in fact all) the methods within my repository are hitting the database everytime. This seems overkill and what I'd ideally like is to do is 'cache' the main data object e.g. 'GetAllAdverts' from the database and to then query against this cached object for things like 'FindAdvert(id), AddAdvert(), DeleteAdvert() etc..' I'd also need to consider updating/deleting/adding records to this cache object and the database. What is the best apporoach for something like this? My knowledge of this type of things is minimal and really looking for advice/guidance/tutorial to point me in the right direction. Thanks in advance.

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  • Raw Video file from website

    - by Charlie
    I would like to make an app that will download videos files that can be played later. At first i thought I could have a UIWeb view and then try to access the cache of it and get the file that way but unfortunately i don't have access to that. After trying that my next thought would be get the direct link to the video file. Essentially what download helper does on fire fox. Any idea of where i could look at for help or any body have any better idea? Is there any stringByEvaluatingjavascript that might be of use or is there away to access the cache on a webview in your own app? Thanks for any help!

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  • .NET SettingsProvider/ApplicationSettingsBase caching

    - by Andy White
    I'm looking at some code that uses the .NET System.Configuration.SettingsProvider and ApplicationSettingsBase to handle configuration. We have a class that derives from SettingsProvider that uses a database as the data store, and then we have other settings classes that inherit from ApplicationSettingsBase, and have the [SettingsProvider(typeof(MySettingsProvider))] attribute. The problem is that we're using these settings classes in multiple applications, but they seem to permanently cache the configuration values, the first time they are loaded. The issue is that if a setting is changed in one application, the other applications will not get the setting until the next restart, because they are cached everywhere. My question is: is there a way to force the SettingsProvider implementation, or the classes derived from ApplicationSettingsBase to not cache values, and re-query the datastore every time the setting is accessed? A valid answer might be that these classes were not intended to be used in multi-application environments...

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  • How many layers are between my program and the hardware?

    - by sub
    I somehow have the feeling that modern systems, including runtime libraries, this exception handler and that built-in debugger build up more and more layers between my (C++) programs and the CPU/rest of the hardware. I'm thinking of something like this: 1 + 2 OS top layer Runtime library/helper/error handler a hell lot of DLL modules OS kernel layer Do you really want to run 1 + 2?-Windows popup (don't take this serious) OS kernel layer Hardware abstraction Hardware Go through at least 100 miles of circuits Eventually arrive at the CPU ADD 1, 2 Go all the way back to my program Nearly all technical things are simply wrong and in some random order, but you get my point right? How much longer/shorter is this chain when I run a C++ program that calculates 1 + 2 at runtime on Windows? How about when I do this in an interpreter? (Python|Ruby|PHP) Is this chain really as dramatic in reality? Does Windows really try "not to stand in the way"? e.g.: Direct connection my binary < hardware?

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  • Why Eventmachine Defer slower than Ruby Thread?

    - by allenwei
    I have two scripts which using mechanize to fetch google index page. I assuming Eventmachine will faster than ruby thread, but not. Eventmachine code cost "0.24s user 0.08s system 2% cpu 12.682 total" Ruby Thread code cost "0.22s user 0.08s system 5% cpu 5.167 total " Am I use eventmachine in wrong way? Who can explain it to me, thanks! 1 Eventmachine require 'rubygems' require 'mechanize' require 'eventmachine' trap("INT") {EM.stop} EM.run do num = 0 operation = proc { agent = Mechanize.new sleep 1 agent.get("http://google.com").body.to_s.size } callback = proc { |result| sleep 1 puts result num+=1 EM.stop if num == 9 } 10.times do EventMachine.defer operation, callback end end 2 Ruby Thread require 'rubygems' require 'mechanize' threads = [] 10.times do threads << Thread.new do agent = Mechanize.new sleep 1 puts agent.get("http://google.com").body.to_s.size sleep 1 end end threads.each do |aThread| aThread.join end

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  • Improving the efficiency of Kinect for Windows DTWGestureRecognition Application

    - by Ray
    Currently I am using the DTWGestureRecognition open source tool for Kinect SDK v1.5. I have recorded a few gestures and use them to navigate through Windows 7. I also have implemented voice control for simple things such as opening PowerPoint, Chrome, etc. My main issue is that the application uses quite a bit of my CPU power which causes it to become slow. During gestures and voice commands, the CPU usage sometimes spikes to 80-90%, which causes the application to be unresponsive for a few seconds. I am running it on a 64 bit Windows 7 machine with an i5 processor and 8 GB of RAM. I was wondering if anyone with any experience using this tool or Kinect in general has made it more efficient and less performance hogging. Right now I removed sections which display the RGB video and the Depth video but even doing that did not make a big impact. Any help is appreciated, thanks!

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  • Computationally intensive scala process using actors hangs uncooperatively

    - by Chick Markley
    I have a computationally intensive scala application that hangs. By hangs I means it is sitting in the process stack using 1% CPU but does not respond to kill -QUIT nor can it be attached via jdb attach. Runs 2-12 hours at 800-900% CPU before it gets stuck The application is using ~10 scala.actors. Until now I have had great success with kill -QUIT but I am bit stumped as to how to proceed. The actors write a fair amount to stdout using println which is redirected to a text file but has not been helpful so far diagnostically. I am just hoping there is some obvious technique when kill -QUIT fails that I am ignorant of. Or just confirmation that having multiple actors println asynchronously is a real bad idea (though I've been doing it for a long time only recently with these results) Details scala 2.8.1 & 2.8.0 mac osx 10.6.5 java version "1.6.0_22" Thanks

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  • Wix Bootstrapper - difficulty detecting if software is already installed c++ redistributable, sql server ce 3.5 sp2

    - by gdeck
    I apologize if this is answered elsewhere. So far (thanks to a post from Rob Mensching), my code will detect .NET 4.0 if it's installed and it'll pass right over it. I'm not able to correctly detect Microsoft Visual C++ 2010 x86 Redistributable OR Microsoft SQL Server Compact 3.5 Service Pack 2. My code is below. I'm learning, so I would appreciate as much constructive criticism as possible. <!--Search for .NET 4.0--> <util:RegistrySearch Id="NETFRAMEWORK40" Root="HKLM" Key="SOFTWARE\Microsoft\Net Framework Setup\NDP\v4\Full" Value="Install" Variable="NETFRAMEWORK40" Result="value"/> <!--Search for Microsoft Visual C++ 2010 x86 Redistributable--> <util:RegistrySearch Id="SearchForCPP2010X86" Root="HKLM" Key="SOFTWARE\Microsoft\VisualStudio\10.0\VC\VCRedist\x86" Value="Install" Variable="CPP2010Redist" Result="exists"/> <!--Search for Microsoft SQL Server Compact 3.5 Service Pack 2--> <util:RegistrySearch Id="SearchForSQLSvrCE35SP2" Root="HKLM" Key="SOFTWARE\Microsoft\Microsoft SQL Server Compact Edition\v3.5\ENU" Value="Install" Variable="SQLSvrCE35SP2" Result="exists"/> <Chain> <!-- Install .Net 4 Full --> <PackageGroupRef Id="Net4Full"/> <!-- Install Microsoft Visual C++ 2010 x86 Redistributable --> <PackageGroupRef Id="MSVisCPP2010x86Redist"/> <!-- Install Microsoft SQL Server Compact 3.5 Service Pack 2 --> <PackageGroupRef Id="SQLExpressCE"/> </Chain> <!--Install .NET 4.0--> <PackageGroup Id="Net4Full"> <ExePackage Id="Net4Full" Name="Microsoft .NET Framework 4.0 Setup" Cache="no" Compressed="yes" PerMachine="yes" Permanent="yes" Vital="yes" SourceFile="BootstrapperLibrary\dotNetFx40_Full_setup.exe" DetectCondition="NETFRAMEWORK40"/> </PackageGroup> <!--Install Microsoft Visual C++ 2010 x86 Redistributable--> <PackageGroup Id="MSVisCPP2010x86Redist"> <ExePackage Id="MSVisCPP2010x86Redis" Name="Microsoft Visual C++ 2010 x86 Redistributable " Cache="no" Compressed="yes" PerMachine="yes" Permanent="yes" Vital="yes" SourceFile="BootstrapperLibrary\vcredist_x86.exe" DetectCondition="CPP2010Redist"/> </PackageGroup> <!--Install Microsoft SQL Server Compact 3.5 Service Pack 2--> <PackageGroup Id="SQLExpressCE"> <ExePackage Id="SQLExpressCE" Name="Microsoft SQL Server Compact 3.5 Service Pack 2 Setup" Cache="no" Compressed="yes" PerMachine="yes" Permanent="yes" Vital="yes" SourceFile="BootstrapperLibrary\SSCERuntime-ENU.exe"/> </PackageGroup>

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  • MVC Partial View Not Refreshing when using JSON data

    - by 40-Love
    I have a dropdown that I'm using to refresh a div with checkboxes. I am trying to figure out why my view is not refreshing if I pass in data in JSON format. If I pass in just a regular string, the view refreshes. If I pass in JSON data, the view does not refresh. If I step through the code in the Partial view, I can see the correct number of records are being passed in, however the view doesn't get refreshed with the correct number of checkboxes. I tried to add some cache directives, it didn't work. This doesn't work: $(function () { $('#ddlMoveToListNames').change(function () { var item = $(this).val(); var selectedListID = $('#ddlListNames').val(); var checkValues = $('input[name=c]:checked').map(function () { return $(this).val(); }).toArray(); $.ajax({ url: '@Url.Action("Test1", "WordList")', type: 'POST', cache: false, data: JSON.stringify({ words: checkValues, moveToListID: item, selectedListID: selectedListID }), dataType: 'json', contentType: 'application/json; charset=utf-8', success: function (result) { } }) .done(function (partialViewResult) { $("#divCheckBoxes").replaceWith(partialViewResult); }); }); }); This works: $(function () { $('#ddlMoveToListNames').change(function () { var item = $(this).val(); var selectedListID = $('#ddlListNames').val(); var checkValues = $('input[name=c]:checked').map(function () { return $(this).val(); }).toArray(); $.ajax({ url: '@Url.Action("Test1", "WordList")', type: 'POST', cache: false, data: { selectedListID: item }, success: function (result) { } }) .done(function (partialViewResult) { $("#divCheckBoxes").replaceWith(partialViewResult); }); }); }); Partial View: @model WLWeb.Models.MyModel <div id="divCheckBoxes"> @foreach (var item in Model.vwWordList) { @Html.Raw("<label><input type='checkbox' value='" + @Html.DisplayFor(modelItem => item.Word) + "' name='c'> " + @Html.DisplayFor(modelItem => item.Word) + "</label>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"); } </div> Controller: [AcceptVerbs(HttpVerbs.Post)] [OutputCache(NoStore = true, Duration = 0, VaryByParam = "*")] public PartialViewResult Test1(MyModel vm, string[] words, string moveToListID, string selectedListID) { int listNameID = Convert.ToInt32(moveToListID); List<vwWordList> lst = db.vwWordLists.Where(s => s.Word.StartsWith("wa") && s.ListID == listNameID).ToList(); vm.vwWordList = lst; return PartialView("Partial1", vm); } View: @Html.DropDownListFor(x => Model.FilterViewModel.MoveToListNameID, Model.FilterViewModel.MoveToListNameList, new { @id = "ddlMoveToListNames", style = "width:100px;" })

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  • SQL 2008 Encryption Scan

    - by Mike K.
    We recently upgraded a database server from SQL 2005 to SQL 2008 64 bit. CPU utilization is oftentimes running at 100% on all four processors now (this never happended on the SQL 2005 server). When I run sp_lock I see a number of processes waiting on a resource called [ENCRYPTION_SCAN]. I am not using any SQL 2008 encryption features. Does anyone know why I would have tasks waiting on this resource? It appears that whenever I have four processes waiting on this resource, CPU hits 100% on all four processors.

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  • ffmpeg libavcodec.so missing while compile with cygwin

    - by nick
    I am building ffmpeg for android by following this tutorial now i got android folder inside the ffmpeg2.0.1 folder but there is no libavcodec-55.so file. instead of that i have lib/libavcodec.a how can i get libavcodec.so file? build_android.sh #!/bin/bash NDK=$HOME/Desktop/adt/android-ndk-r9 SYSROOT=$NDK/platforms/android-9/arch-arm/ TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/windows-x86_64 function build_one { ./configure \ --prefix=$PREFIX \ --enable-shared \ --disable-static \ --disable-doc \ --disable-ffmpeg \ --disable-ffplay \ --disable-ffprobe \ --disable-ffserver \ --disable-avdevice \ --disable-doc \ --disable-symver \ --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \ --target-os=linux \ --arch=arm \ --enable-cross-compile \ --sysroot=$SYSROOT \ --extra-cflags="-Os -fpic $ADDI_CFLAGS" \ --extra-ldflags="$ADDI_LDFLAGS" \ $ADDITIONAL_CONFIGURE_FLAG make clean make make install } CPU=arm PREFIX=$(pwd)/android/$CPU ADDI_CFLAGS="-marm" build_one

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  • Download attachment issue with IE6-8 - non ssl

    - by Arun P Johny
    I'm facing an issue with file download with IE6-8 in non ssl environment. I've seen a lot of articles about the IE attachment download issue with ssl. As per the articles I tried to set the values of Pragma, Cache-Control headers, but still no luck with it. These are my response headers Cache-Control: private, max-age=5 Date: Tue, 25 May 2010 11:06:02 GMT Pragma: private Content-Length: 40492 Content-Type: application/pdf Content-Disposition: Attachment;Filename="file name.pdf" Server: Apache-Coyote/1.1 I've set the header values after going through some of these sites KB 812935 KB 316431 But these items are related to SSL. I've checked the response body and headers using fiddler, the response body is proper. I'm using window.open(url, "_blank") to download the file, if I change it to window.open(url, "_parent") or change the "Content-Disposition" to 'inline;Filename="file name.pdf"' it works fine. Please help me to solve this problem

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  • passing data from a client form via jquery ajax dinamicly

    - by quantum62
    i wanna insert specification of members that enter in textboxs of form in the database .i do this operation with jquery ajax when i call webmetod with static value the operation do successfully.for example this code is ok. $.ajax({ type: "POST", url:"MethodInvokeWithJQuery.aspx/executeinsert", data: '{ "username": "user1", "name":"john","family":"michael","password":"123456","email": "[email protected]", "tel": "123456", "codemeli": "123" }', contentType: "application/json; charset=utf-8", dataType: "json", async: true, cache: false, success: function (msg) { $('#myDiv2').text(msg.d); }, error: function (x, e) { alert("The call to the server side failed. " + x.responseText); } } ); but when i wanna use of values that enter in textboxes dynamically error occur.whats problem?i try this two code <script type="text/javascript"> $(document).ready( function () { $("#Button1").click( function () { var username, family, name, email, tel, codemeli, password; username = $('#<%=TextBox1.ClientID%>').val(); name = $('#<%=TextBox2.ClientID%>').val(); family = $('#<%=TextBox3.ClientID%>').val(); password = $('#<%=TextBox4.ClientID%>').val(); email = $('#<%=TextBox5.ClientID%>').val(); tel = $('#<%=TextBox6.ClientID%>').val(); codemeli = $('#<%=TextBox7.ClientID%>').val(); $.ajax( { type: "POST", url: "WebApplication20.aspx/executeinsert", data: "{'username':'username','name':name, 'family':family,'password':password, 'email':email,'tel':tel, 'codemeli':codemeli}", contentType: "application/json;charset=utf-8", dataType: "json", async: true, cache: false, success: function(msg) { alert(msg); }, error: function (x, e) { alert("The call to the server side failed. " + x.responseText); } } ); } ) }) </script> or $(document).ready( function () { $("#Button1").click( function () { var username, family, name, email, tel, codemeli, password; username = $('#<%=TextBox1.ClientID%>').val(); name = $('#<%=TextBox2.ClientID%>').val(); family = $('#<%=TextBox3.ClientID%>').val(); password = $('#<%=TextBox4.ClientID%>').val(); email = $('#<%=TextBox5.ClientID%>').val(); tel = $('#<%=TextBox6.ClientID%>').val(); codemeli = $('#<%=TextBox7.ClientID%>').val(); $.ajax( { type: "POST", url: "WebApplication20.aspx/executeinsert", data: '{"username" : '+username+', "name": '+name+', "family": '+family+', "password": '+password+', "email": '+email+', "tel": '+tel+' , "codemeli": '+codemeli+'}', contentType: "application/json;charset=utf-8", dataType: "json", async: true, cache: false, success: function(msg) { alert(msg); }, error: function (x, e) { alert("The call to the server side failed. " + x.responseText); } } ); } ) })

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  • Programmitically accessing internal storage (not SD card) on Verizon HTC Droid Incredible (Android)

    - by tliebeck
    Hello, I'm trying to find information on how to programmatically access the HTC Droid Incredible's supposed 8GB of internal storage. To determine the external storage (SD Card) location, I'm using android.os.Environment.getExternalStorageDirectory(). I've not been able to find any corollary for internal phone storage. In examining HTC/Google Nexus One, Motorola Droid, and HTC Dream/G1 phones, there (as would be expected) does not appear to be any mount point for such arbitrary internal storage. On these phones the internal storage is divided amongst /data, /system, and /cache partitions. The Incredible's internal storage is certainly not going to be located in /system. /cache is also unlikely given that it is globally non-readable/non-executable. I'd read in reviews that the phone will still be limited to 512MB or so for apps, suggesting that it is not simply a subdirectory of /data. Any suggestions would be greatly appreciated. I do not have access to a Droid Incredible unit myself, of course.

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  • Continuously checking database from a Windows service

    - by JonF
    I am making a Windows service which needs to continuously check for database entries that can be added at any time to tell it to execute some code. It is looking to see if it's status is set to pending, and it's execute time entry is than the current time. Is the only way to do this to just run select statements over and over? It might need to execute the code every minute which means I need to run the select statement every minute looking for entries in the database. I'm trying to avoid unneccesary cpu time because I'm probably going to end up paying for cpu cycles on the hosting provider

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  • Are all the system's floating points operations the same?

    - by Jj
    We're making this web app in PHP and when working in the reports we have Excel files to compare our results to make sure our coding is doing the right operations. Now we're running into some differences due floating point arithmetics. We're doing the same divisions and multiplications and running into slightly different numbers, that add up to a notable difference. My question is if Excel is delegating it's floating point arithmetic to the CPU and PHP is also relying in the CPU for it's operations. Or does each application implements its own set of math algorithms?

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  • measuring performance - using real clicks vs "ab" command

    - by shanyu
    I have a web site in closed beta, developed in Django, runs with Mysql on Debian. In the last few days, the main page has been showing a slowdown. For every ten clicks, one or two receives extremely slow response (10 secs or more), others are as fast as they used to be. When I was searching for the problem, I ran into this issue that I couldn't grasp: top command shows that when I request the main page, mysql shoots up to 90% - 100% cpu usage. I get the page just as the cpu use gets back to normal. So, I thought, it is db. Then I called ab with parameters -n 1000 -c 5, I got decent performance, about 100 pages per second, just as it was before the slowdown. I would imagine a worse performance as 10-20% of requests take 10 secs to load. Is this conflict between ab and "real" clicks normal, or am I using ab in a wrong configuration?

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  • accessing pdf via https URL

    - by Paul
    I send out a newsletter email containing URLs to a https website that then redirects to a pdf document. On first invocation of a URL the user is prompted with the typical https browser "security alert" popup, on selecting "Yes" the display of the PDF fails. The HTTP Header on the failed response is: HTTP/1.1 200 OK Server: ECS/HTTP-Server Date: Tue, 16 Mar 2010 15:57:26 GMT Content-type: application/pdf Content-language: en-US Set-cookie: JSESSIONID=0000r111cRz1Vc-PtCJg8Cdu4eR:-1; Path=/ Expires: Thu, 01 Dec 1994 16:00:00 GMT Cache-control: no-cache="set-cookie, set-cookie2" Connection: close Subsequent invocations of the URL successfully opens the PDF (at this point we have the session id cookie set by the initial failed request). The HTTP Header on the successful response is: HTTP/1.1 200 OK Server: ECS/HTTP-Server Date: Tue, 16 Mar 2010 16:53:03 GMT Content-type: application/pdf Content-language: en-US Connection: close The email client is Lotus Notes 6.5 which launches an IE6 browser Any ideas?

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  • Does the iPhone compress images saved within my app's documents directory?

    - by Jane Sales
    We are caching images downloaded from our server. We write them to our local storage like this: NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0] ; NSString* folder = [[documentsDirectory stringByAppendingPathComponent:@"flook.images"] retain]; NSString* fileName = [folder stringByAppendingFormat:@"/%@", aBaseFilename]; BOOL writeSuccess = [anImageData writeToFile:fileName atomically:NO]; The downloaded images are always the expected size, around 45-85KB. Later, we read images from our cache like this: NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0] ; NSString* folder = [[documentsDirectory stringByAppendingPathComponent:@"flook.images"] retain]; NSString* fileName = [folder stringByAppendingFormat:@"/%@", aBaseFilename]; image = [UIImage imageWithContentsOfFile:fileName]; Occasionally, the images returned from this cache read are much smaller because they are much more compressed - around 5-10KB. Has the OS done this to us?

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  • segmented reduction with scattered segments

    - by Christian Rau
    I got to solve a pretty standard problem on the GPU, but I'm quite new to practical GPGPU, so I'm looking for ideas to approach this problem. I have many points in 3-space which are assigned to a very small number of groups (each point belongs to one group), specifically 15 in this case (doesn't ever change). Now I want to compute the mean and covariance matrix of all the groups. So on the CPU it's roughly the same as: for each point p { mean[p.group] += p.pos; covariance[p.group] += p.pos * p.pos; ++count[p.group]; } for each group g { mean[g] /= count[g]; covariance[g] = covariance[g]/count[g] - mean[g]*mean[g]; } Since the number of groups is extremely small, the last step can be done on the CPU (I need those values on the CPU, anyway). The first step is actually just a segmented reduction, but with the segments scattered around. So the first idea I came up with, was to first sort the points by their groups. I thought about a simple bucket sort using atomic_inc to compute bucket sizes and per-point relocation indices (got a better idea for sorting?, atomics may not be the best idea). After that they're sorted by groups and I could possibly come up with an adaption of the segmented scan algorithms presented here. But in this special case, I got a very large amount of data per point (9-10 floats, maybe even doubles if the need arises), so the standard algorithms using a shared memory element per thread and a thread per point might make problems regarding per-multiprocessor resources as shared memory or registers (Ok, much more on compute capability 1.x than 2.x, but still). Due to the very small and constant number of groups I thought there might be better approaches. Maybe there are already existing ideas suited for these specific properties of such a standard problem. Or maybe my general approach isn't that bad and you got ideas for improving the individual steps, like a good sorting algorithm suited for a very small number of keys or some segmented reduction algorithm minimizing shared memory/register usage. I'm looking for general approaches and don't want to use external libraries. FWIW I'm using OpenCL, but it shouldn't really matter as the general concepts of GPU computing don't really differ over the major frameworks.

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