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• Ubuntu 14.04 install fails with Via S3 UniChrome Pro graphics

  - by WizardNo.7

  I am trying to install Ubuntu 14.04 on a Fujitsu Siemens Amilo Pro laptop(it's quite old yes, has about 30GB Hard Drive and I think 192mb of RAM) which currently has Windows XP installed (which I'd like to keep for the time being). I have downloaded the 32-bit Desktop ISO and used unetbootin to create a Live USB for this laptop. When I boot from USB, I arrive at the unetbootin Grey and Blue menu and pick either "Try Ubuntu without installing", or "Install Ubuntu". The menu goes away and an Ubuntu loadscreen showing UBUNTU and four dots which progressively change between white and orange. At about the second color changing cycle a white underscore symbol appears next to the fourth dot and flickers. There is some leftover text from the kernel boot still visible, but there is no graphical desktop. After this I have to hard reboot or shut-down. $ lshw -c video *-display UNCLAIMED description: VGA compatible controller product: CN700/P4M800 Pro/P4M800 CE/VN800 Graphics [S3 UniChrome Pro] Vendor: VIA Technologies, Inc. physical id: 0 bus info: pci@0000:01:00.0 version: 01 width: 32 bits clock: 66MHz capabilities: pm agp agp-2.0 vga_controller bus_master cap_list configuration: latency=64 mingnt=2 resources: memory:f0000000-f3ffffff memory:d1000000-d1ffffff

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• Can't get Unity 3D to work in 11.10

  - by pmoseph

  I recently upgraded to 11.10 on my Lenovo ThinkPad T520, and I'm not able to load Unity 3D (I'm not selecting 2D at login menu either). me@mycomp:~$ echo $DESKTOP_SESSION ubuntu-2d I ran the unity support test below as well. me@mycomp:~$ /usr/lib/nux/unity_support_test -p Xlib: extension "GLX" missing on display ":0.0". Xlib: extension "GLX" missing on display ":0.0". Xlib: extension "GLX" missing on display ":0.0". Error: unable to create the OpenGL context And it looks like I only have one graphics card: me@mycomp:~$ lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) Also, Ubuntu lists nothing under the "Additional Drivers" window. Any help would be extremely appreciated as I'm somewhat of a noob. Thanks! Edit 1: Here is the output of lshw -C display me@mycomp:~$ sudo lshw -C display *-display description: VGA compatible controller product: 2nd Generation Core Processor Family Integrated Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 09 width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:43 memory:f0000000-f03fffff memory:e0000000-efffffff ioport:5000(size=64)

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• TechEd 2012: Fast SQL Server

  - by Tim Murphy

  While I spend a certain amount of my time creating databases (coding around SQL Server and setup a server when I have to) it isn’t my bread and butter.  Since I have run into a number of time that SQL Server needed to be tuned I figured I would step out of my comfort zone and see what I can learn. Brent Ozar packed a mountain of information into his session on making SQL Server faster.  I’m not sure how he found time to hit all of his points since he was allowing the audience abuse him on Twitter instead of asking questions, but he managed it.  I also questioned his sanity since he appeared to be using a fruit laptop. He had my attention though when he stated that he had given up on telling people to not use “select *”. He posited that it could be fixed with hardware by caching the data in memory.  He continued by cautioning that having too many indexes could defeat this approach.  His logic was sound if not always practical, but it was a good place to start when determining the trade-offs you need to balance.  He was moving pretty fast, but I believe he was prescribing this solution predominately for OLTP database prior to moving on to data warehouse solutions. Much of the advice he gave for data warehouses is contained in the Microsoft Fast Track guidance so I won’t rehash it here.  To summarize the solution seems to be the proper balance memory, disk access speed and the speed of the pipes that get the data from storage to the CPU.  It appears to be sound guidance and the session gave enough information that going forward we should be able to find the details needed easily.  Just what the doctor ordered. del.icio.us Tags: SQL Server,TechEd,TechEd 2012,Database,Performance Tuning

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• Use a SQL Database for a Desktop Game

  - by sharethis

  Developing a Game Engine I am planning a computer game and its engine. There will be a 3 dimensional world with first person view and it will be single player for now. The programming language is C++ and it uses OpenGL. Data Centered Design Decision My design decision is to use a data centered architecture where there is a global event manager and a global data manager. There are many components like physics, input, sound, renderer, ai, ... Each component can trigger and listen to events. Moreover, each component can read, edit, create and remove data. The question is about the data manager. Whether to Use a Relational Database Should I use a SQL Database, e.g. SQLite or MySQL, to store the game data? This contains virtually all game content like items, characters, inventories, ... Except of meshes and textures which are even more performance related, so I will keep them in memory. Is a SQL database fast enough to use it for realtime reading and writing game informations, like the position of a moving character? I also need to care about cross-platform compatibility. Aside from keeping everything in memory, what alternatives do I have? Advantages Would Be The advantages of using a relational database like MySQL would be the data orientated structure which allows fast computation. I would not need objects for representing entities. I could easily query data of objects near the player needed for rendering. And I don't have to take care about data of objects far away. Moreover there would be no need for savegames since the hole game state is saved in the database. Last but not least, expanding the game to an online game would be relative easy because there already is a place where the hole game state is stored.

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• Encapsulate standard C functions?

  - by Jack Stout

  While studying the C programming language and learning safe practices, I'm inclined to write a layer of functionality over several parts of the standard library. This would serve two purposes: I could use standard parts of the language in ways that feel more familiar or rational to me, and I could easily replace that functionality with my own, if I needed to. I could benefit from this, but should I do it? As an example, we can consider memory management. If I've written malloc() into the constructors of each of my objects, then decide that I need to handle memory allocation on my own, I have to edit the constructor associated with every object. By referencing my own function, I can change the contents of that function without writing a new constructors. It seems obvious that I should do this, but I'm used to Python. I'm extremely comfortable in that environment and have no problem linking to any part of the standard library from any part of my program because I know I will almost certainly leave that relationship untouched for the life of the project. The situation I'm running into with C feels like I'm trying to hide the language from myself. Will writing a layer of functionality over the C standard library help me in learning the language and developing a codebase, or will it stifle my understanding going forward?

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• 11.10 system crashes for no apparent reason [closed]

  - by varanoid

  I'm relatively new to Linux, and while I know a fair amount about computers and programming, it certainly isn't my specialty. I have a dual boot with Windows 7, and it has been working very well for me until recently. Just randomly the computer will freeze. The last time I was smart enough to keep the System Monitor open when it happened, and it looks like at the time of freezing "bash" and a bunch of other processes that I don't recognize seem to have flooded the memory. So it looks like my memory is getting overloaded and this is what is crashing the system, but I honestly have no idea what could be doing it. Generally I have a bunch of programs running, but they don't take much RAM or CPU: Transmission, Libre Office Writer, Firefox, Empathy, and Banshee. Sometimes I also have Text Editor and Terminal open, but it crashes regardless. When it crashes, it seems that all of the programs are working fine but things like windows, the taskbar, and operations like Alt+Tab just stop working properly or at all. Sometimes the mouse and keyboard freeze and I have to power off manually. Other than that I don't know what the problem is. The only irregularity I've experienced is that I can't download "Debian package management system" even though other updates download fine.

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• Game Asset Management

  - by user964123

  I am making my first small mobile game in C# XNA. Lets say I have 3 screens, the main menu, options and game screen. A single game session usually lasts for 1 min, so the user will alternate frequently between the main menu and game screen. Therefore, once I load the textures for either screen, I want to keep them in memory to avoid frequent reloading. Both screens share some assets like their background textures, but differ in others. The first solution I came up with is making 2 texture factory classes, MainScreenAssetFactory and GameScreenAssetFactory, each with their own content manager, and ill store them in a globally accessible point so that they persist after either screen is destroyed. There is also a OptionsScreenAssetFactory, but that I dont want to cache it since the options screen is rarely visited. A typical Factory would look something like this public class MainScreenAssetFactory { private readonly ContentManager contentManager; public MainScreenAssetFactory(IServiceProvider serviceProvider, string rootDirectory) { contentManager = new ContentManager(serviceProvider) { RootDirectory = rootDirectory }; } public Texture2D ListElementBackground { get { return return contentManager.Load<Texture2D>("UserTab"); } } public Texture2D ListElementBulletPoint { get { return return contentManager.Load<Texture2D>("TabIcon"); } } public Texture2D LoggedOutUser { get { return return contentManager.Load<Texture2D>("LoggedOutUser"); } } } Since both Main, Options and Game Screen share some common resources, instead of loading them more than once, I created another class CommonAssetTexFactory which holds the common stuff and stays in-memory during the app lifetime. For example, this class gets passed to the options screen when it is created. However, given my small game with its few assets, I am already finding this solution cumbersome and inflexible. Changing anything would require looking to see if its already in the common factory, and if not, modifying existing factories and so on. And this is just considering textures currently, i didnt add sound files yet. I cant imagine bigger games with thousands of resources using this approach. A better idea must exist. Would someone please enlighten me?

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• Creating movement path displays in a top-down 2d RTS

  - by nihohit

  My game is a top-down 2d RTS coded in C# using SFML's libraries. I want that during unit selection, a unit will display it's movement path on the map. Currently, after the path is computed as a list of directions ({left, up,down, down, down, left}, as an example), it's sent to the graphical component to create it's UI equivalent, and here I'm having some problems. current, these I've checked three ways to do it: compute the size of the image (in the example above it'll be a 3*2 rectangle) and create an invisible rectangle, and then go over the directions list and mark each spot with a visible point, so as to get a continous line. This system is slightly problematic because of the amount of large images that I need to save, but mostly because I have a lot of fine detail onscreen, and a continous line obstructs the view. again, compute the size of the image, but now create several (let's say 4) invisible images of that size, and then instead of a single continous line I'll switch between the four images, in each will appear only a fourth of the spots, in a way which creates a path animation. This is nicer on the eye, but here the memory demands, and the amount of time needed to compute each such image-loop is significant. Just create a list of single markers, each on a different spot on the path. This is very quick & easy on memory, but too sparse. Is there a simple or resource-light system to create path-animations?

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• Image mapping using lookup tables [on hold]

  - by jblasius

  I have an optimization problem. I'm using a look-up table to map a pixel in an image: for (uint32_t index = 0u; index < imgSize; index++) { img[ lt[ index ] ] = val; } Is there a faster way to do this, perhaps using a reinterpret_cast or something like that? I am accessing two different memory addresses, so what is the compiler doing? One solution is to do a set of reads to access adjacent memory addresses. struct mblock { uint32_t buf[10u]; }; mblock mb; for (uint32_t index = 0u; index < imgSize; index += 10u) { mb = *reinterpret_cast<mblock*>(lt + index)); for (uint8_t i = 0u; i < 10u; i ++) { mb.buf[i] += img; } for (uint8_t i = 0u; i < 10u; i ++) { *( mb.buf[i] ) = val; } } This speeds up the code because I'm separating the image access from the table look-up; the positions in the look-up table are adjacent. I still get the image access problem as it is accessing random address positions.

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• after BIOS splash, will not boot -- asks me to select an OS, but it just reboots

  - by user92040

  I'm running Linux Mint 13 MATE 64-bit. Everything has been working for several weeks. Yesterday, when I tried to boot up my computer, after the BIOS screen flashes I reach a screen with a black background that reads at the top: GNU GRUB version1.99-21ubuntu3.4 Then there is a box in which I can select from the following lines: Linux Mint 13 MATE 64-bit, 3.2.0-31-generic (/dev/sdb2) Linux Mint 13 MATE 64-bit, 3.2.0-31-generic (/dev/sdb2) -- recovery mode Previous Linux versions Memory test (memtest86+) Memory test (memtest86+, serial console 115200) At the bottom it reads: Use the ? and ? keys to select which entry is highlighed. Press enter to boot the selected OS, 'e' to edit the commands before booting or 'c' for a command-line. I have no idea why it started doing this and, worse, I have no idea how to get out of here. No matter which option I select, I can't get it to boot the OS. If I select either of the first two, it reboots to splash the BIOS and then I'm right back where I started. If I choose "Previous Linux versions" I get essentially the same screen with only two choices (which are the same as the first two choices listed above, Linux 13 MATE and the recovery mode). Again, choosing either one of those results in a reboot. If I try to run either of the memtest options, it reads: error: unknown command 'linux16', Press any key to continue... Then it brings me back to the same screen Can anyone help me please? Intel Core i5-2500 ASUS P8Z68-V LX Intel Motherboard G. Skill Ripjaws series F3-12800CL9D-8GBRL (4GB x2) Plextor 128GB M5S Series SSD

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• Storing images in file system and returning URLs or virtually resizing and returning byte arrays?

  - by ismaelf

  I need to create a REST web service to manage user submitted images and displaying them all in a website. There are multiple websites that are going to use this service to manage and display images. The requirements are to have 5 pre-defined image sizes available. The 2 options I see are the following: The web service will create the 5 images, store them in the file system and and store the URL's in the database when the user submits the image. When the image is requested, the web service will return an array of URLs. I see this option to be a little hard on the hard drive. The estimates are 10,000 users per site, and lets say, 100 sites. The heavy processing will be done when the user submits the image and each image is going to be pulled from the File System. The web service will store just the image that the user submits in the file system and it's URL in the database. When the user request images, the web service will get the info from the DB, load the image on memory, create its 5 instances and return an object with 5 image arrays (I will probably cache the arrays). This option is harder on the processor and memory. The heavy processing will be done when the images get requested. A plus I see for option 2 is that it will give me the option to rewrite the URL of the image and make them site dependent (prettier) than having a image repository for all websites. But this is not a big deal. What do you think of these options? Do you have any other suggestions?

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• Best approach for tracking dependent state

  - by Pace

  Let's pretend I work on a project tracking application. The application is a database backed, server hosted, web application. In this application there are Projects which have many Activities which have many Tasks. A Task has two date fields an originalDueDate and a projectedDueDate. In addition, there are dynamic fields on the Activities and the Projects which indicate whether the Activity or Project is behind schedule based on the projected due dates of the child tasks and various other variables such as remaining buffer time, etc. There are a number of things that can cause the projectedDueDate to change. For example, an employee working on the project may (via a server request) enter in a shipping delay. Alternatively, a site may (via a server request) enter in an unexpected closure. When any of these things occur I need to not only update the projectedDueDate of the Task but also trigger the corresponding Project and Activity to update as well. What is the best way to do this? I've thought of the observer pattern but I don't keep a single copy of all these objects in memory. When a request comes in, I query the Task in from the database, at that point there is no associated Activity in memory that would be a listener. I could remove the ability to query for Tasks and force the application to query first by Project, then by Activity (in context of Project), then by task (in context of Activity) adding the observer relationships at each step but I'm not sure if that is the best way. I could setup a database event listening system so when a Task modified event is dispatched I have a handler which queries for the Activity at that point. I could simply setup a two-way relationship between Task and Activity so that the Task knows about the parent Activity and when the Task updates his state the Task grabs his parent and updates state. Right now I'm stuck considering all the options and am wondering if any single approach (doesn't have to be a listed approach) is jumping out at others as the best approach.

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• Is it a good practice to create a list of definitions for all symbols and words in a programming language?

  - by MrDaniel

  After arriving at this point in Learning Python The Hard Way I am wondering if this is a good practice to create a list of symbols and define what they do as noted in bold below, for every programming language. This seems reasonable, and might be very useful to have when jumping between programming languages? Is this something that programmers do or is it just a waste of effort? Exercise 22: What Do You Know So Far? There won't be any code in this exercise or the next one, so there's no WYSS or Extra Credit either. In fact, this exercise is like one giant Extra Credit. I'm going to have you do a form of review what you have learned so far. First, go back through every exercise you have done so far and write down every word and symbol (another name for 'character') that you have used. Make sure your list of symbols is complete. Next to each word or symbol, write its name and what it does. If you can't find a name for a symbol in this book, then look for it online. If you do not know what a word or symbol does, then go read about it again and try using it in some code. You may run into a few things you just can't find out or know, so just keep those on the list and be ready to look them up when you find them. Once you have your list, spend a few days rewriting the list and double checking that it's correct. This may get boring but push through and really nail it down. Once you have memorized the list and what they do, then you should step it up by writing out tables of symbols, their names, and what they do from memory. When you hit some you can't recall from memory, go back and memorize them again.

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• Wireless does not work 12.10

  - by superkoop

  My primary issue is that my wireless does not work after I installed 12.10. The output to rfkill list all: 5: hci0: Bluetooth Soft blocked: no Hard blocked: no The output to lshw -class network is: *-network description: Ethernet interface product: 88E8040 PCI-E Fast Ethernet Controller vendor: Marvell Technology Group Ltd. physical id: 0 bus info: pci@0000:09:00.0 logical name: eth0 version: 12 serial: 00:21:9b:d6:46:51 size: 100Mbit/s capacity: 100Mbit/s width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=sky2 driverversion=1.30 duplex=full ip=192.168.1.102 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s resources: irq:44 memory:fe8fc000-fe8fffff ioport:de00(size=256) *-network description: Network controller product: BCM4312 802.11b/g LP-PHY vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:0b:00.0 version: 01 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: driver=b43-pci-bridge latency=0 resources: irq:17 memory:fe7fc000-fe7fffff The output to lspci -nn for the pertinent information is: 0b:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01) Thus, it seems the solution would be to run: sudo apt-get install linux-headers-generic sudo apt-get install --reinstall bcmwl-kernel-source sudo modprobe wl However, I do not currently have access to an ethernet connection, as I am currently only able to use verizon wireless 3g internet. Thus, is there a way to set up ICS with a Vista machine so that I can access the internet by using the Vista machine as the host? Or, is it possible to fix this by downloading the important packages in vista and moving them to ubuntu via USB drive?

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• After upgrade to 12.04 wireless keeps dropping on BCM4312

  - by Sheket

  I know there are plenty of questions very similar to these, but I've tried practically everything and it still isn't working. Some solutions get the wireless connection working, but it goes very slow and drops after a few minutes. Then it won't reconnect and keeps asking for password. Hope you can help me. Thanks in advance. This is the output for sudo lshw -C network *-network description: Network controller product: BCM4312 802.11b/g LP-PHY vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:02:00.0 version: 01 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: driver=b43-pci-bridge latency=0 resources: irq:18 memory:f0300000-f0303fff *-network description: Ethernet interface product: AR8132 Fast Ethernet vendor: Atheros Communications Inc. physical id: 0 bus info: pci@0000:05:00.0 logical name: eth1 version: c0 serial: 00:23:5a:9b:6e:b1 size: 100Mbit/s capacity: 100Mbit/s width: 64 bits clock: 33MHz capabilities: pm msi pciexpress vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=atl1c driverversion=1.0.1.0-NAPI duplex=full firmware=N/A ip=192.168.0.106 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s resources: irq:42 memory:f0200000-f023ffff ioport:a000(size=128) *-network description: Wireless interface physical id: 1 logical name: wlan0 serial: 00:24:2c:83:f0:81 capabilities: ethernet physical wireless configuration: broadcast=yes driver=b43 driverversion=3.2.0-30-generic firmware=478.104 link=no multicast=yes wireless=IEEE 802.11bg And for lsmod | grep b43 b43 342643 0 mac80211 436455 1 b43 cfg80211 178679 2 b43,mac80211 bcma 25651 1 b43 ssb 50691 1 b43 And for rfkill list 5: phy0: Wireless LAN Soft blocked: no Hard blocked: no

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• Is this too much to ask for a game programming and developing enthusiast? Am I doing this wrong?

  - by I_Question_Things_Deeply

  I have been a computer-fanatic for almost a decade now. I've always loved and wondered how computers work, even from the purest, lowest hardware level to the very smallest pixel on the screen, and all the software around that. That seems to be my problem though ... as I try to write code (I'm pretty fluent at C++) I always sit there enormous amounts of time in front of a text-editor wondering how every line, statement, datum, function, etc. will correspond to every Assembly and machine instruction performed to do absolutely everything necessary for the kernel to allocate memory to run my compiled program, and all of the other hardware being used as well. For example ... I would write cout << "Before memory changed" << endl; and run the debugger to get the Assembly for this, and then try and reverse disassemble the Assembly to machine code based on my ISA, and then research every .dll, library file, linked library, linking process, linker source code of the program, the make file, the kernel I'm using's steps of processing this compilation, the hardware's part aside from the processor (e.g. video card, sound card, chipset, cache latency, byte-sized registers, calling convention use, DDR3 RAM and disk drive, filesystem functioning and so many other things). Am I going about programming wrong? I mean I feel I should know everything that goes on underneath English syntax on a computer program. But the problem is that the more I research every little thing the less I actually accomplish at all. I can never finish anything because of this mentality, yet I feel compelled to know everything... what should I do?

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• Random Access Violation Exception in WPF Application

  - by PT1984

  Hi, I am facing weird problem while running regression tests on my WPF Application. I am getting AccessViolationException with different stacktraces each time. First : Message :Attempted to read or write protected memory. This is often an indication that other memory is corrupt. StackTrace : at MS.Win32.PresentationCore.UnsafeNativeMethods.MILUnknown.Release(IntPtr pIUnkown) at MS.Win32.PresentationCore.UnsafeNativeMethods.MILUnknown.ReleaseInterface(IntPtr& ptr) at System.Windows.Media.SafeMILHandle.ReleaseHandle() at System.Runtime.InteropServices.SafeHandle.InternalFinalize() at System.Runtime.InteropServices.SafeHandle.Dispose(Boolean disposing) at System.Runtime.InteropServices.SafeHandle.Finalize() Source :PresentationCore Type : System.AccessViolationException. Second : Message :Attempted to read or write protected memory. This is often an indication that other memory is corrupt. StackTrace : at MS.Win32.PresentationCore.UnsafeNativeMethods.IMILBitmapEffect.GetOutput(SafeHandle THIS_PTR, UInt32 uiIndex, SafeMILHandle pContext, BitmapSourceSafeMILHandle& ppBitmapSource) at System.Windows.Media.Effects.BitmapEffect.GetOutput(SafeHandle unmanagedEffect, Int32 index, BitmapEffectRenderContext context) at System.Windows.Media.Effects.BitmapEffect.GetOutput(BitmapEffectInput input) at System.Windows.Media.Effects.BitmapEffectState.GetEffectOutput(Visual visual, RenderTargetBitmap& renderBitmap, Matrix worldTransform, Rect windowClip, Matrix& finalTransform) at System.Windows.Media.Effects.BitmapEffectVisualState.RenderBitmapEffect(Visual visual, Channel channel) at System.Windows.Media.Effects.BitmapEffectContent.ExecuteRealizationsUpdate() at System.Windows.Media.RealizationContext.RealizationUpdateSchedule.Execute() at System.Windows.Media.MediaContext.Render(ICompositionTarget resizedCompositionTarget) at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget) at System.Windows.Media.MediaContext.AnimatedRenderMessageHandler(Object resizedCompositionTarget) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler) at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler) at System.Windows.Threading.DispatcherOperation.InvokeImpl() at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state) at System.Threading.ExecutionContext.runTryCode(Object userData) at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Windows.Threading.DispatcherOperation.Invoke() at System.Windows.Threading.Dispatcher.ProcessQueue() at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler) at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler) at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Boolean isSingleParameter) at System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg) at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.Run() at System.Windows.Application.RunDispatcher(Object ignore) at System.Windows.Application.RunInternal(Window window) at System.Windows.Application.Run(Window window) at System.Windows.Application.Run() at Main() Source :PresentationCore Type :System.AccessViolationException In Application Event Log I found following entries : Dispatcher processing has been suspended, but messages are still being processed. Faulting application **.exe, version 1.0.0.*, stamp 4c08d288, faulting module wpfgfx_v0300.dll, version 3.0.6920.1427, stamp 488f3056, debug? 0, fault address 0x0012ec36. My Application uses Dispatcher from another thread, to change the values of the controls , enable - disable those, change visibility etc., the thred is run multiple times in a second. Please let me know if anybody has faced this problem? Thanks in advance, -Prasad

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• NHibernate which cache to use for WinForms application

  - by chiccodoro

  I have a C# WinForms application with a database backend (oracle) and use NHibernate for O/R mapping. I would like to reduce communication to the database as much as possible since the network in here is quite slow, so I read about second level caching. I found this quite good introduction, which lists the following available cache implementations. I'm wondering which implementation I should use for my application. The caching should be simple, it should not significantly slow down the first occurrence of a query, and it should not take much memory to load the implementing assemblies. (With NHibernate and Castle, the application already takes up to 80 MB of RAM!) Velocity: uses Microsoft Velocity which is a highly scalable in-memory application cache for all kinds of data. Prevalence: uses Bamboo.Prevalence as the cache provider. Bamboo.Prevalence is a .NET implementation of the object prevalence concept brought to life by Klaus Wuestefeld in Prevayler. Bamboo.Prevalence provides transparent object persistence to deterministic systems targeting the CLR. It offers persistent caching for smart client applications. SysCache: Uses System.Web.Caching.Cache as the cache provider. This means that you can rely on ASP.NET caching feature to understand how it works. SysCache2: Similar to NHibernate.Caches.SysCache, uses ASP.NET cache. This provider also supports SQL dependency-based expiration, meaning that it is possible to configure certain cache regions to automatically expire when the relevant data in the database changes. MemCache: uses memcached; memcached is a high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load. Basically a distributed hash table. SharedCache: high-performance, distributed and replicated memory object caching system. See here and here for more info My considerations so far were: Velocity seems quite heavyweight and overkill (the files totally take 467 KB of disk space, haven't measured the RAM it takes so far because I didn't manage to make it run, see below) Prevalence, at least in my first attempt, slowed down my query from ~0.5 secs to ~5 secs, and caching didn't work (see below) SysCache seems to be for ASP.NET, not for winforms. MemCache and SharedCache seem to be for distributed scenarios. Which one would you suggest me to use? There would also be a built-in implementation, which of course is very lightweight, but the referenced article tells me that I "(...) should never use this cache provider for production code but only for testing." Besides the question which fits best into my situation I also faced problems with applying them: Velocity complained that "dcacheClient" tag not specified in the application configuration file. Specify valid tag in configuration file," although I created an app.config file for the assembly and pasted the example from this article. Prevalence, as mentioned above, heavily slowed down my first query, and the next time the exact same query was executed, another select was sent to the database. Maybe I should "externalize" this topic into another post. I will do that if someone tells me it is absolutely unusual that a query is slowed down so much and he needs further details to help me.

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• boost::serialization of mutual pointers

  - by KneLL

  First, please take a look at these code: class Key; class Door; class Key { public: int id; Door *pDoor; Key() : id(0), pDoor(NULL) {} private: friend class boost::serialization::access; template <typename A> void serialize(A &ar, const unsigned int ver) { ar & BOOST_SERIALIZATION_NVP(id) & BOOST_SERIALIZATION_NVP(pDoor); } }; class Door { public: int id; Key *pKey; Door() : id(0), pKey(NULL) {} private: friend class boost::serialization::access; template <typename A> void serialize(A &ar, const unsigned int ver) { ar & BOOST_SERIALIZATION_NVP(id) & BOOST_SERIALIZATION_NVP(pKey); } }; BOOST_CLASS_TRACKING(Key, track_selectively); BOOST_CLASS_TRACKING(Door, track_selectively); int main() { Key k1, k_in; Door d1, d_in; k1.id = 1; d1.id = 2; k1.pDoor = &d1; d1.pKey = &k1; // Save data { wofstream f1("test.xml"); boost::archive::xml_woarchive ar1(f1); // !!!!! (1) const Key *pK = &k1; const Door *pD = &d1; ar1 << BOOST_SERIALIZATION_NVP(pK) << BOOST_SERIALIZATION_NVP(pD); } // Load data { wifstream i1("test.xml"); boost::archive::xml_wiarchive ar1(i1); // !!!!! (2) A *pK = &k_in; B *pD = &d_in; // (2.1) //ar1 >> BOOST_SERIALIZATION_NVP(k_in) >> BOOST_SERIALIZATION_NVP(d_in); // (2.2) ar1 >> BOOST_SERIALIZATION_NVP(pK) >> BOOST_SERIALIZATION_NVP(pD); } } The first (1) is a simple question - is it possible to pass objects to archive without pointers? If simply pass objects 'as is' that boost throws exception about duplicated pointers. But I'm confused of creating pointers to save objects. The second (2) is a real trouble. If comment out string after (2.1) then boost will corectly load a first Key object (and init internal Door pointer pDoor), but will not init a second Door (d_in) object. After this I have an inited *k_in* object with valid pointer to Door and empty *d_in* object. If use string (2.2) then boost will create two Key and Door objects somewhere in memory and save addresses in pointers. But I want to have two objects *k_in* and *d_in*. So, if I copy a values of memory objects to local variables then I store only addresses, for example, I can write code after (2.2): d_in.id = pD->id; d_in.pKey = pD->pKey; But in this case I store only a pointer and memory object remains in memory and I cannot delete it, because *d_in.pKey* will be unvalid. And I cannot perform a deep copy with operator=(), because if I write code like this: Key &operator==(const Key &k) { if (this != &k) { id = k.id; // call to Door::operator=() that calls *pKey = *d.pKey and so on *pDoor = *k.pDoor; } return *this; } then I will get a something like recursion of operator=()s of Key and Door. How to implement proper serialization of such pointers?

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• How do I maximize code coverage?

  - by naivedeveloper

  Hey all, the following is a snippet of code taken from the unix ptx utility. I'm attempting to maximize code coverage on this utility, but I am unable to reach the indicated portion of code. Admittedly, I'm not as strong in my C skills as I used to be. The portion of code is indicated with comments, but it is towards the bottom of the block. if (used_length == allocated_length) { allocated_length += (1 << SWALLOW_REALLOC_LOG); block->start = (char *) xrealloc (block->start, allocated_length); } Any help interpreting the indicated portion in order to cover that block would be greatly appreciated. /* Reallocation step when swallowing non regular files. The value is not the actual reallocation step, but its base two logarithm. */ #define SWALLOW_REALLOC_LOG 12 static void swallow_file_in_memory (const char *file_name, BLOCK *block) { int file_handle; /* file descriptor number */ struct stat stat_block; /* stat block for file */ size_t allocated_length; /* allocated length of memory buffer */ size_t used_length; /* used length in memory buffer */ int read_length; /* number of character gotten on last read */ /* As special cases, a file name which is NULL or "-" indicates standard input, which is already opened. In all other cases, open the file from its name. */ bool using_stdin = !file_name || !*file_name || strcmp (file_name, "-") == 0; if (using_stdin) file_handle = STDIN_FILENO; else if ((file_handle = open (file_name, O_RDONLY)) < 0) error (EXIT_FAILURE, errno, "%s", file_name); /* If the file is a plain, regular file, allocate the memory buffer all at once and swallow the file in one blow. In other cases, read the file repeatedly in smaller chunks until we have it all, reallocating memory once in a while, as we go. */ if (fstat (file_handle, &stat_block) < 0) error (EXIT_FAILURE, errno, "%s", file_name); if (S_ISREG (stat_block.st_mode)) { size_t in_memory_size; block->start = (char *) xmalloc ((size_t) stat_block.st_size); if ((in_memory_size = read (file_handle, block->start, (size_t) stat_block.st_size)) != stat_block.st_size) { error (EXIT_FAILURE, errno, "%s", file_name); } block->end = block->start + in_memory_size; } else { block->start = (char *) xmalloc ((size_t) 1 << SWALLOW_REALLOC_LOG); used_length = 0; allocated_length = (1 << SWALLOW_REALLOC_LOG); while (read_length = read (file_handle, block->start + used_length, allocated_length - used_length), read_length > 0) { used_length += read_length; /* Cannot cover from this point...*/ if (used_length == allocated_length) { allocated_length += (1 << SWALLOW_REALLOC_LOG); block->start = (char *) xrealloc (block->start, allocated_length); } /* ...to this point. */ } if (read_length < 0) error (EXIT_FAILURE, errno, "%s", file_name); block->end = block->start + used_length; } /* Close the file, but only if it was not the standard input. */ if (! using_stdin && close (file_handle) != 0) error (EXIT_FAILURE, errno, "%s", file_name); }

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• Intrinsics program (SSE) - g++ - help needed

  - by Sriram

  Hi all, This is the first time I am posting a question on stackoverflow, so please try and overlook any errors I may have made in formatting my question/code. But please do point the same out to me so I may be more careful. I was trying to write some simple intrinsics routines for the addition of two 128-bit (containing 4 float variables) numbers. I found some code on the net and was trying to get it to run on my system. The code is as follows: //this is a sample Intrinsics program to add two vectors. #include <iostream> #include <iomanip> #include <xmmintrin.h> #include <stdio.h> using namespace std; struct vector4 { float x, y, z, w; }; //functions to operate on them. vector4 set_vector(float x, float y, float z, float w = 0) { vector4 temp; temp.x = x; temp.y = y; temp.z = z; temp.w = w; return temp; } void print_vector(const vector4& v) { cout << " This is the contents of vector: " << endl; cout << " > vector.x = " << v.x << endl; cout << " vector.y = " << v.y << endl; cout << " vector.z = " << v.z << endl; cout << " vector.w = " << v.w << endl; } vector4 sse_vector4_add(const vector4&a, const vector4& b) { vector4 result; asm volatile ( "movl $a, %eax" //move operands into registers. "\n\tmovl $b, %ebx" "\n\tmovups (%eax), xmm0" //move register contents into SSE registers. "\n\tmovups (%ebx), xmm1" "\n\taddps xmm0, xmm1" //add the elements. addps operates on single-precision vectors. "\n\t movups xmm0, result" //move result into vector4 type data. ); return result; } int main() { vector4 a, b, result; a = set_vector(1.1, 2.1, 3.2, 4.5); b = set_vector(2.2, 4.2, 5.6); result = sse_vector4_add(a, b); print_vector(a); print_vector(b); print_vector(result); return 0; } The g++ parameters I use are: g++ -Wall -pedantic -g -march=i386 -msse intrinsics_SSE_example.C -o h The errors I get are as follows: intrinsics_SSE_example.C: Assembler messages: intrinsics_SSE_example.C:45: Error: too many memory references for movups intrinsics_SSE_example.C:46: Error: too many memory references for movups intrinsics_SSE_example.C:47: Error: too many memory references for addps intrinsics_SSE_example.C:48: Error: too many memory references for movups I have spent a lot of time on trying to debug these errors, googled them and so on. I am a complete noob to Intrinsics and so may have overlooked some important things. Any help is appreciated, Thanks, Sriram.

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• SurfaceView drawn on top of other elements after coming back from specific activity

  - by spirytus

  I have an activity with video preview displayed via SurfaceView and other views positioned over it. The problem is when user navigates to Settings activity (code below) and comes back then the surfaceview is drawn on top of everything else. This does not happen when user goes to another activity I have, neither when user navigates outside of app eg. to task manager. Now, you see in code below that I have setContentVIew() call wrapped in conditionals so it is not called every time when onStart() is executed. If its not wrapped in if statements then all works fine, but its causing loosing lots of memory (5MB+) each time onStart() is called. I tried various combinations and nothing seems to work so any help would be much appreciated. @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //Toast.makeText(this,"Create ", 2000).show(); // set 32 bit window (draw correctly transparent images) getWindow().getAttributes().format = android.graphics.PixelFormat.RGBA_8888; // set the layout of the screen based on preferences of the user sharedPref = PreferenceManager.getDefaultSharedPreferences(this); } public void onStart() { super.onStart(); String syncConnPref = null; syncConnPref = sharedPref.getString("screensLayouts", "default"); if(syncConnPref.contentEquals("default") && currentlLayout!="default") { setContentView(R.layout.fight_recorder_default); } else if(syncConnPref.contentEquals("simple") && currentlLayout!="simple") { setContentView(R.layout.fight_recorder_simple); } // I I uncomment line below so it will be called every time without conditionals above, it works fine but every time onStart() is called I'm losing 5+ MB memory (memory leak?). The preview however shows under the other elements exactly as I need memory leak makes it unusable after few times though // setContentView(R.layout.fight_recorder_default); if(getCamera()==null) { Toast.makeText(this,"Sorry, camera is not available and fight recording will not be permanently stored",2000).show(); // TODO also in here put some code replacing the background with something nice return; } // now we have camera ready and we need surface to display picture from camera on so // we instantiate CameraPreviw object which is simply surfaceView containing holder object. // holder object is the surface where the image will be drawn onto // this is where camera live cameraPreview will be displayed cameraPreviewLayout = (FrameLayout) findViewById(id.camera_preview); cameraPreview = new CameraPreview(this); // now we add surface view to layout cameraPreviewLayout.removeAllViews(); cameraPreviewLayout.addView(cameraPreview); // get layouts prepared for different elements (views) // this is whole recording screen, as big as screen available recordingScreenLayout=(FrameLayout) findViewById(R.id.recording_screen); // this is used to display sores as they are added, it displays like a path // each score added is a new text view simply and as user undos these are removed one by one allScoresLayout=(LinearLayout) findViewById(R.id.all_scores); // layout prepared for controls like record/stop buttons etc startStopLayout=(RelativeLayout) findViewById(R.id.start_stop_layout); // set up timer so it can be turned on when needed //fightTimer=new FightTimer(this); fightTimer = (FightTimer) findViewById(id.fight_timer); // get views for displaying scores score1=(TextView) findViewById(id.score1); score2=(TextView) findViewById(id.score2); advantages1=(TextView) findViewById(id.advantages1); advantages2=(TextView) findViewById(id.advantages2); penalties1=(TextView) findViewById(id.penalties1); penalties2=(TextView) findViewById(id.penalties2); RelativeLayout welcomeScreen=(RelativeLayout) findViewById(id.welcome_screen); Animation fadeIn = AnimationUtils.loadAnimation(this, R.anim.fade_in); welcomeScreen.startAnimation(fadeIn); Toast.makeText(this,"Start ", 2000).show(); animateViews(); } Settings activity is below, after coming back from this activity surfaceview is drawn on top of other elements. public class SettingsActivity extends PreferenceActivity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if(MyFirstAppActivity.getCamera()==null) { Toast.makeText(this,"Sorry, camera is not available",2000).show(); return; } addPreferencesFromResource(R.xml.preferences); } }

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• wordexp followed by strcpy = EXC_BAD_ACCESS + sharedlibrary apply-load-rules-all

  - by fyngyrz

  The implication is a memory problem. I have static allocations for these: char akdir[400]; char homedir[400]; This crashes on the first strcpy(): void setuplibfoo() { long ii; double x; wordexp_t result; // This obtains the user's home directory // -------------------------------------- homedir[0]=0; // in case wordexp fails switch (wordexp("~/",&result,0)) { case 0: // Successful. We'll fall into deallocate when done. { strcpy(homedir,result.we_wordv[0]); // <<--- CRASH! strcpy(akdir,homedir); strcat(akdir,"ak-plugins/"); vs_status(akdir); } case WRDE_NOSPACE: // If the error was WRDE_NOSPACE, then { // perhaps part of the result was allocated. wordfree (&result); } default: // all other errors do not require deallocation { break; } } ...additional code clipped.. doesn't get there on crash. This is in a shared library I've written that is linked to my application, also something I've written. In this case, it doesn't get very far, although if it starts, it's fine. ...I've read the wordexp docs several times; they say they allocate new objects, so you just set up that type and call them with the address. The switch error model is right from the wordexp docs: http://www.gnu.org/s/libc/manual/html_mono/libc.html#Wordexp-Example It doesn't always crash. Just sometimes, and just under 10.6. Never under 10.5 I'm building debug mode with XCode 3.1.1, under OSX 10.5.8 it seems to run ok, I've not seen a crash -- under 10.6, it crashes... sometimes. But always with that same exception, and always in the same place. The Google has it that this actually means, somehow, that it's too soon to allocate memory. But all the instances I could find were memory errors on the part of the programmer. Overruns, etc. And I can't find any docs on when it IS safe to allocate memory. Now, the path that expands there is nowhere near 400 characters. it's this (it it completes): /Users/flake/ak-plugins/ and this: /Users/flake/ ...if it doesn't. the strcpy... copies 2nd param to first. Theirs to mine. And it works! under 10.5. :/ So is wordexp broke? Is 10.6 broke? Am I cRaZy? Here's the debugger output: 0x00013446 <+0049> call 0xc98da <dyld_stub_wordexp> 0x0001344b <+0054> test %eax,%eax 0x0001344d <+0056> je 0x13454 <setuplibfoo+63> 0x0001344f <+0058> jmp 0x134da <setuplibfoo+197> 0x00013454 <+0063> mov -0x1c(%ebp),%eax 0x00013457 <+0066> mov (%eax),%eax 0x00013459 <+0068> mov %eax,0x4(%esp) 0x0001345d <+0072> lea 0xb6cc2(%ebx),%eax 0x00013463 <+0078> mov (%eax),%eax 0x00013465 <+0080> mov %eax,(%esp) 0x00013468 <+0083> call 0xc9898 <dyld_stub_strcpy> 0x0001346d <+0088> lea 0xb6cc2(%ebx),%eax <<--CRASH!

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• what are the difficulties of operating system multithreading?

  - by ghedas

  I am reading a book that compares two ways of implementing threads, Middleware Threads and OS Threads. I have a question about these sentences: "A difficulty of operating system multithreading, however, is performance overhead. Since it is the operating system that is involved in switching threads, this involves system calls. These are generally more expensive than thread operations executed at the user level, which is where the transactional middleware is operating."

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• Best practices for sending automated daily emails from web service

  - by Tauren

  I am running a web service that currently sends confirmation emails out to new users via the gmail smtp servers. As I'm only getting a few new users each day, this hasn't been a problem. I've recently added new features to the webapp that will require a customized message to be sent out to each user every day. Think of this as similar to the regular messages LinkedIn sends out that give you a status report on the activity in your network. Every user's message will be different. With thousands of users, this means thousands of unique messages will be sent each day. Edit: I've since found that these types of email are called "transactional or relationship messages". Spamtacular has a good article on differentiating between marketing and transactional email. I don't think using gmail's smtp servers will cut it anymore, but I don't know that for sure. I don't know what gmail's maximum outgoing messages per account is (it might be 100/day), but they limit outgoing mail to 500 recipients per message. I'm not sending a single message to 500 recipients, but I'm going to be sending 1000's of customized messages with each recipient getting one per day. I'm interested to learn any best practices for doing this (especially for Java-based webapps). Here are some of my thoughts and concerns on it: Should I set up my own outgoing mail server? If I do this, it seems like I'll have all sorts of other issues to worry about, such as preventing mail server abuse, monitoring bounces, allowing ways to opt-out of emails, etc. Are there any tools or services to help with this? Maybe something like OpenEMM or a services like MailChimp? But those seem focused more toward email marketing campaigns. I don't think I should have the webapp itself handle sending emails as it currently is for new user signups. I'm thinking I should setup a separate messaging server that can access the same backend/datastore as the webapp. Thoughts on this? Should I consider setting up some sort of message queueing service to help with this, such as JMS, RabbitMQ, ActiveMQ, etc.? Do I need to provide users a way to opt-out? Do I need to flag these as bulk messages? I don't really consider these email marketing messages, but I'm unsure what is considered appropriate or proper netiquette. Any advice is appreciated. I'm also very interested in open source tools or web services that simplify things and could help me to ramp up as quickly as possible. Thanks!

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