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• MIPS assembly: how to declare integer values in the .data section?

  - by Barney

  I'm trying to get my feet wet with MIPS assembly language using the MARS simulator. My main problem now is how do I initialize a set of memory locations so that I can access them later via assembly language instructions? For example, I want to initialize addresses 0x1001000 - 0x10001003 with the values 0x99, 0x87, 0x23, 0x45. I think this can be done in the data declaration (.data) section of my assembly program but I'm not sure of the syntax. Is this possible? Alternatively, in the .data section, how do I specify storing the integer values in some memory location (I don't care where, but I just want to reference them somewhere). So I'm looking for the C equivalent of "int x = 20, y=30, z=90;" I know how to do that using MIPS instructions but is it possible to declare something like that in the .data section of a MIPS assembly program?

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• Browser won't connect to svn server

  - by Tammy Wilson

  This has been driving me nuts. For some reason, I can't access my svn repository using a browser in this laptop that I'm using right now (firefox & ie) The connection just times out. I'm at home right now and the server is in another room. It connects OK there and it also connects OK in my virtual machine in this same laptop. I'm pretty stumped right now and can't figure out why this is happening. I've also checked the proxies and I'm 100% sure I'm not using any at all. The virtual machine running on this laptop is XP 32bit and this one is a Win7 64 bit. Thanks

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• ASP.NET - Missing #includes cause compilation errors: Failed to map the path '...'

  - by frankadelic

  I have an ASP.NET application which features some server-side includes. For example: <!--#include virtual="/scripts.inc" --> These files are not present in my ASP.NET website project because my website starts in a virtual directory: /path-to-my-application When I choose Build Web Site, I get this error: Failed to map the path '/scripts.inc' Visual Studio cannot resolve these include files that are defined at the root directory level. They are not visible in the website project. Aside from manually commenting out the #include references, is there any way I can get the website to build? Can I force Visual Studio to ignore those errors and compile the site? Once the website is pushed out to IIS, there is no problem, because all the #include files are in place. NOTE - Web Controls are not an option for this application. Please assume #include files are a requirement. Also, I cannot move the include files since they are used by other applications.

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• Does the CLR store small values in 'natural' sized locations?

  - by izb

  In Java, a byte or short is stored in the JVM's 'natural' word length, i.e. for the most part, 32-bits. An exception would be an array of bytes, where each byte occupies a byte of memory. Does the CLR do the same thing? If it does do this, in what situations are there exceptions to this? E.g. How much memory does this occupy? struct MyStruct { short s1; short s2; }

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• How to load entities into private collections using the entity framework

  - by Anton P

  I have a POCO domain model which is wired up to the entity framework using the new ObjectContext class. public class Product { private ICollection<Photo> _photos; public Product() { _photos = new Collection<Photo>(); } public int Id { get; set; } public string Name { get; set; } public virtual IEnumerable<Photo> Photos { get { return _photos; } } public void AddPhoto(Photo photo) { //Some biz logic //... _photos.Add(photo); } } In the above example i have set the Photos collection type to IEnumerable as this will make it read only. The only way to add/remove photos is through the public methods. The problem with this is that the Entity Framework cannot load the Photo entities into the IEnumerable collection as it's not of type ICollection. By changing the type to ICollection will allow callers to call the Add mentod on the collection itself which is not good. What are my options? Edit: I could refactor the code so it does not expose a public property for Photos: public class Product { public Product() { Photos = new Collection<Photo>(); } public int Id { get; set; } public string Name { get; set; } private Collection<Photo> Photos {get; set; } public IEnumerable<Photo> GetPhotos() { return Photos; } public void AddPhoto(Photo photo) { //Some biz logic //... Photos.Add(photo); } } And use the GetPhotos() to return the collection. The other problem with the approach is that I will loose the change tracking abilities as I cannot mark the collection as Virtual - It is not possible to mark a property as private virtual. In NHibernate I believe it's possible to map the proxy class to the private collection via configuration. I hope that this will become a feature of EF4. Currently i don't like the inability to have any control over the collection!

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• Jets3t on Android

  - by Chubbs

  Hey guys, I am trying to use the Jets3t library within an Android application, and I keep getting errors with the Rest service when I use the library. 04-27 16:47:39.491: ERROR/S3Service(225): Couldn't initialize a sax driver for the XMLReader I have tried to include the Xerces library and the Crimson library, and it dont play well. I get this error: Attempt to include a core class (java.* or javax.*) in something other than a core library. It is likely that you have attempted to include in an application the core library (or a part thereof) from a desktop virtual machine. This will most assuredly not work. At a minimum, it jeopardizes the compatibility of your app with future versions of the platform. It is also often of questionable legality. If you really intend to build a core library -- which is only appropriate as part of creating a full virtual machine distribution, as opposed to compiling an application -- then use the "--core-library" option to suppress this error message. Is there something I can do to get it working ?

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• DOM versus Castor

  - by Ronnie

  Can anyone tell me which one better to use for xml parsing - DOM or Castor (with criterion being lesser memory usage)?

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• Asynchronous readback from opengl front buffer using multiple PBO's

  - by KillianDS

  I am developing an application that needs to read back the whole frame from the front buffer of an openGL application. I can hijack the application's opengl library and insert my code on swapbuffers. At the moment I am successfully using a simple but excruciating slow glReadPixels command without PBO's. Now I read about using multiple PBO's to speed things up. While I think I've found enough resources to actually program that (isn't that hard), I have some operational questions left. I would do something like this: create a series (e.g. 3) of PBO's use glReadPixels in my swapBuffers override to read data from front buffer to a PBO (should be fast and non-blocking, right?) Create a seperate thread to call glMapBufferARB, once per PBO after a glReadPixels, because this will block until the pixels are in client memory. Process the data from step 3. Now my main concern is of course in steps 2 and 3. I read about glReadPixels used on PBO's being non-blocking, will this be an issue if I issue new opengl commands after that very fast? Will those opengl commands block? Or will they continue (my guess), and if so, I guess only swapbuffers can be a problem, will this one stall or will glReadPixels from front buffer be many times faster than swapping (about each 15-30ms) or, worst case scenario, will swapbuffers be executed while glReadPixels is still reading data to the PBO? My current guess is this logic will do something like this: copy FRONT_BUFFER - generic place in VRAM, copy VRAM-RAM. But I have no idea which of those 2 is the real bottleneck and more, what the influence on the normal opengl command stream is. Then in step 3. Is it wise to do this asynchronously in a thread separated from normal opengl logic? At the moment I think not, It seems you have to restore buffer operations to normal after doing this and I can't install synchronization objects in the original code to temporarily block those. So I think my best option is to define a certain swapbuffer delay before reading them out, so e.g. calling glReadPixels on PBO i%3 and glMapBufferARB on PBO (i+2)%3 in the same thread, resulting in a delay of 2 frames. Also, when I call glMapBufferARB to use data in client memory, will this be the bottleneck or will glReadPixels (asynchronously) be the bottleneck? And finally, if you have some better ideas to speed up frame readback from GPU in opengl, please tell me, because this is a painful bottleneck in my current system. I hope my question is clear enough, I know the answer will probably also be somewhere on the internet but I mostly came up with results that used PBO's to keep buffers in video memory and do processing there. I really need to read back the front buffer to RAM and I do not find any clear explanations about performance in that case (which I need, I cannot rely on "it's faster", I need to explain why it's faster). Thank you

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• Problem with Gallio and TeamCity and the new Visual Studio 2010 release

  - by Bernard Larouche

  I am running TeamCity on a virtual machine. I have installed the new Visual Studio 2010 release yesterday and converted my VS 2008 projects. I also have installed .NET Framework 4 on my virtual machine. Before yesterday all my projects were building succesfully on the CI server but since I installed VS 2010 I get the following error message : error MSB5014: File format version is not recognized. MSBuild can only read solution files between versions 7.0 and 9.0, inclusive. I did change my config on Team City to take into account the new .NET 4 framework : Build Runner : MSBuild Build File Path : CFT.msbuild MSBuild version : Microsoft.NET Framework 4.0 MSBuild ToolsVersion : 4.0 Run Platform : x86 I think it has something to do with the fact that now MSBuild must refer to .NET 4 framwork but it seems that it keeps refering to 2.0.

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• SqlDataReader / DbDataReader implementation question

  - by Jose

  Does anyone know how DbDataReaders actually work. We can use SqlDataReader as an example. When you do the following cmd.CommandText = "SELECT * FROM Customers"; var rdr = cmd.ExecuteReader(); while(rdr.Read()) { //Do something } Does the data reader have all of the rows in memory, or does it just grab one, and then when Read is called, does it go to the db and grab the next one? It seems just bringing one into memory would be bad performance, but bringing all of them would make it take a while on the call to ExecuteReader. I know I'm the consumer of the object and it doesn't really matter how they implement it, but I'm just curious, and I think that I would probably spend a couple hours in Reflector to get an idea of what it's doing, so thought I'd ask someone that might know. I'm just curious if anyone has an idea.

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• JBoss Seam - Jetty - Virtualhosting

  - by Walter White

  Hi all, I am trying to cutback on the memory usage of my server and would like to optimize the architecture. I currently deploy 2 separate web applications to Jetty 6.1.22 that correspond to different virtualhosts. They have pretty much the same application stack except one has fewer components and are styled differently (content, images, css, etc.). If I change my design pattern over to EJB / EAR + 2 WARS embedded, will that lower the memory consumption? Will that give me a single instance of JBoss Seam, Quartz, and all of my components? They must use a different datasource. Thanks, Walter

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• Objective-C Pointer to class that implements a protocol

  - by Winder

  I have three classes which implement the same protocol, and have the same parent class which doesn't implement the protocol. Normally I would have the protocol as pure virtual functions in the parent class but I couldn't find an Objective-C way to do that. How can I utilize polymorphism on these subclasses and call the functions implemented in the protocol without warnings? Some pseudocode if that didn't make sense: @interface superclass: NSObject {} @interface child1: superclass<MyProtocol> {} @interface child2: superclass<MyProtocol> {} The consumer of these classes: @class child1 @class child2 @class superclass @interface SomeViewController: UIViewController { child1 *oneView; child2 *otherView; superclass *currentView; } -(void) someMethod { [currentView protocolFunction]; } The only nice way I've found to do pure virtual functions in Objective-C is a hack by putting [self doesNotRecognizeSelector:_cmd]; in the parent class, but it isn't ideal.

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• OutOfMemoryError what to increase and how?

  - by Pentium10

  I have a really long collection with 10k items, and when running a toString() on the object it crashes. I need to use this output somehow. 05-21 12:59:44.586: ERROR/dalvikvm-heap(6415): Out of memory on a 847610-byte allocation. 05-21 12:59:44.636: ERROR/dalvikvm(6415): Out of memory: Heap Size=15559KB, Allocated=12932KB, Bitmap Size=613KB 05-21 12:59:44.636: ERROR/AndroidRuntime(6415): Uncaught handler: thread main exiting due to uncaught exception 05-21 12:59:44.636: ERROR/AndroidRuntime(6415): java.lang.OutOfMemoryError 05-21 12:59:44.636: ERROR/AndroidRuntime(6415): at java.lang.AbstractStringBuilder.enlargeBuffer(AbstractStringBuilder.java:97) 05-21 12:59:44.636: ERROR/AndroidRuntime(6415): at java.lang.AbstractStringBuilder.append0(AbstractStringBuilder.java:155) 05-21 12:59:44.636: ERROR/AndroidRuntime(6415): at java.lang.StringBuilder.append(StringBuilder.java:202) 05-21 12:59:44.636: ERROR/AndroidRuntime(6415): at java.util.AbstractCollection.toString(AbstractCollection.java:384) I need step by step guide how to increase the heap for and Android application. I don't run the command line.

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• pyinstaller: 2 instances of my cherrypy app exe get executed.

  - by d.c

  I have a cherrypy app that I've made an exe with pyinstaller. now when I run the exe it loads itself twice into memory. Watching the taskmanager shows the first instance load into about 1k, then a second later a second instance of hte exe loads into about 3k ram. If I close the bigger one both processes die. If I close hte smaller one only that one dies. Loading the exe with subprocess, if I try to proc.kill(), it only kills the small one leaving the other running in memory. Is this a sideeffect of using cherrypy and pyinstaller together?

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• Output of gcc -fdump-tree-original

  - by Job

  If I dump the code generated by GCC for a virtual destructor (with -fdump-tree-original), I get something like this: ;; Function virtual Foo::~Foo() (null) ;; enabled by -tree-original { <<cleanup_point <<< Unknown tree: expr_stmt (void) (((struct Foo *) this)->_vptr.Foo = &_ZTV3Foo + 8) >>> >>; } <D.20148>:; if ((bool) (__in_chrg & 1)) { <<cleanup_point <<< Unknown tree: expr_stmt operator delete ((void *) this) >>> >>; } My question is: where is the code after "<D.20148>:;" located? It is outside of the destructor so when is this code executed?

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• In LINQ-SQL, wrap the DataContext is an using statement - pros cons

  - by hIpPy

  Can someone pitch in their opinion about pros/cons between wrapping the DataContext in an using statement or not in LINQ-SQL in terms of factors as performance, memory usage, ease of coding, right thing to do etc. Update: In one particular application, I experienced that, without wrapping the DataContext in using block, the amount of memory usage kept on increasing as the live objects were not released for GC. As in, in below example, if I hold the reference to List of q object and access entities of q, I create an object graph that is not released for GC. DataContext with using using (DBDataContext db = new DBDataContext()) { var q = from x in db.Tables where x.Id == someId select x; return q.toList(); } DataContext without using and kept alive DBDataContext db = new DBDataContext() var q = from x in db.Tables where x.Id == someId select x; return q.toList(); Thanks.

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• Why won't the VisualVM Profiler profile my application?

  - by Luke

  I've created a simple 1 file java application that iterates through a loop, calls some functions, allocates some memory, adds some numbers, etc. I run that application via eclipse's Run As->Java Application. The running application shows up in Java VisualVM under Local. I double click on that application and go to the Profiler tab. The default settings are: Start profiling from classes: my.main.package.** Do not profile classes: java.*, javax.*, sun.*, sunw.*, com.sun.* I click on CPU. The CPU and Memory buttons gray out. Nothing happens. The Status says profiling inactive. When my application terminates the Status says application terminated. What am I doing wrong here? Are there some settings I need to tweak? Do I need to set a VM flag when I launch my application?

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• Silverlight SOS (Son of Strike) documenation

  - by Kris Erickson

  Is there any microsoft or even non-official documentation for SOS for Silverlight. Other than a few web posts I have seen zero documentation for it on MSDN. Even official documentation for the CLR version of SOS seems hard to find, this ancient article mentions a sos.htm file that is included in the windows SDK but it doesn't appear to be there any more. Any pointers to debugging Silveright with SOS? I have found the following blog posts but am looking for more information: http://davybrion.com/blog/2009/08/finding-memory-leaks-in-silverlight-with-windbg/ http://www.ningzhang.org/2008/12/19/silverlight-debugging-with-windbg-and-sos/ http://debuggingblog.com/wp/2009/07/07/windbg-extension-sos-in-clr-40net-framework-40-ctp-net-runtime-dll-renamed-and-sos-commands-just-got-richer/ http://www.netfxharmonics.com/label/debugging http://blogs.msdn.com/b/tess/archive/2008/08/21/debugging-silverlight-applications-with-windbg-and-sos-dll.aspx http://blogs.msdn.com/b/delay/archive/2009/03/11/where-s-your-leak-at-using-windbg-sos-and-gcroot-to-diagnose-a-net-memory-leak.aspx http://blogs.msdn.com/b/delay/archive/2009/03/09/controls-are-like-diapers-you-don-t-want-a-leaky-one-implementing-the-weakevent-pattern-on-silverlight-with-the-weakeventlistener-class.aspx

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• Eclipse + Git: Can't add files to my repository

  - by Stegeman

  I use Eclipse (Helios) with PDT and egit. I have a project without versioning, so I created a git repository for it by doing: Team -> Share Project When I try to add the files of my project to the repository: Team -> Add I get an exception: Failed to add resource to index Failed to add resource to index Exception caught during execution of add command When I add the files manually on the command line, everything is working fine. Any ideas? EDIT: The error eclipse gives is: Caused by: org.eclipse.jgit.errors.ObjectWritingException: Unable to create new object: Z:\eage_layout\.git\objects\60\f30dd232bd6ddaeb198fb11400c2613a072189 at org.eclipse.jgit.storage.file.ObjectDirectoryInserter.insert(ObjectDirectoryInserter.java:100) at org.eclipse.jgit.api.AddCommand.call(AddCommand.java:177) The code I'm running is located on a virtual machine running on CentOs. I'm working on a windows machine and using a samba share to get access to the code on the virtual machine. I've put the filesystem permissions on my .git directory to 777, but still it does not work.

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• C++: looking for thread based a parallel kd tree library.

  - by Arman

  Hello, Are there some implementation for KD-Tree on shared memory machines? thanks Arman.

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• OutOfMemoryException - out of ideas

  - by Captain Comic

  Hi I have a net Windows service that is constantly throwing OutOfMemoryException. The service has two builds for x86 and x64 Windows. However on x64 it consumes a lot more memory. I have tried profiling it with various memory profilers. But I cannot get a clue what the problem is. The diagnosis - service consumes lot of VMSize. Also I tried to look at performance counters (perfmon.exe). What I can see is that heap size is growing and %GC time is 19%. My application has threads and locking objects, DB connections and WCF interface. See first app in list The link to picture with performance counters view http://s006.radikal.ru/i215/1003/0b/ddb3d6c80809.jpg

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• Convert a byte array to a class containing a byte array in C#

  - by Mathijs

  I've got a C# function that converts a byte array to a class, given it's type: IntPtr buffer = Marshal.AllocHGlobal(rawsize); Marshal.Copy(data, 0, buffer, rawsize); object result = Marshal.PtrToStructure(buffer, type); Marshal.FreeHGlobal(buffer); I use sequential structs: [StructLayout(LayoutKind.Sequential)] public new class PacketFormat : Packet.PacketFormat { } This worked fine, until I tried to convert to a struct/class containing a byte array. [StructLayout(LayoutKind.Sequential)] public new class PacketFormat : Packet.PacketFormat { public byte header; public byte[] data = new byte[256]; } Marshal.SizeOf(type) returns 16, which is too low (should be 257) and causes Marshal.PtrToStructure to fail with the following error: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. I'm guessing that using a fixed array would be a solution, but can it also be done without having to resort to unsafe code?

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• Use mod_rewrite to redirect from example.com/dir to www.example.com/dir

  - by kavoir.com

  Assume / is the document root of my domain example.com. /.htaccess RewriteEngine on RewriteCond %{HTTP_HOST} ^golfcoursesd\.com$ [NC] RewriteRule ^(.*)$ http://www.golfcoursesd.com/$1 [R=301,L] /dir/.htaccess <IfModule mod_rewrite.c> RewriteEngine On RewriteBase / RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /dir/index.php [L] </IfModule> I know how to redirect example.com/dir to www.example.com/dir, because /.htaccess does the very job. However, the trick here is that I have to keep /dir/.htaccess to serve up virtual directories (such as /dir/state/AK/35827/ which aren't actual directories) if you know what I mean. Problem is, if I keep /dir/.htaccess, a request of: http://example.com/dir/state/AK/35827/ DOES NOT redirect to: http://www.example.com/dir/state/AK/35827/ as would: http://example.com/ redirect to: http://www.example.com/ Not sure if I made it clear. Basically, how to make http://example.com/dir/state/AK/35827/ correctly redirect to http://www.example.com/dir/state/AK/35827/ AND I can serve virtual URLs?

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• ungetc in Python

  - by Dragos Toader

  Some file read (readlines()) functions in Python copy the file contents to memory (as a list) I need to process a file that's too large to be copied in memory and as such need to use a file pointer (to access the file one byte at a time) -- as in C getc(). The additional requirement I have is that I'd like to rewind the file pointer to previous bytes like in C ungetc(). Is there a way to do this in Python? Also, in Python, I can read one line at a time with readline() Is there a way to read the previous line going backward?

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• openmp in mex : stackoverflow error

  - by Edwin

  i have got the following fraction of code that getting me the stack overflow error #pragma omp parallel shared(Mo1, Mo2, sum_normalized_p_gn, Data, Mean_Out,Covar_Out,Prior_Out, det) private(i) num_threads( number_threads ) { //every thread has a new copy double* normalized_p_gn = (double*)malloc(NMIX*sizeof(double)); #pragma omp critical { int id = omp_get_thread_num(); int threads = omp_get_num_threads(); mexEvalString("drawnow"); } #pragma omp for //some parallel process..... } the variables declared in the shared are created by malloc. and they consumes with large amount of memory there are 2 questions regarding to the above code. 1) why this would generate the stack overflow error( i.e. segmentation fault) before it goes into the parallel for loop? it works fine when it runs in the sequential mode.... 2) am i right to dynamic allocate memory for each thread like "normalized_p_gn" above? Regards Edwin

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