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  • Tracking unique versions of files with hashes

    - by rwmnau
    I'm going to be tracking different versions of potentially millions of different files, and my intent is to hash them to determine I've already seen that particular version of the file. Currently, I'm only using MD5 (the product is still in development, so it's never dealt with millions of files yet), which is clearly not long enough to avoid collisions. However, here's my question - Am I more likely to avoid collisions if I hash the file using two different methods and store both hashes (say, SHA1 and MD5), or if I pick a single, longer hash (like SHA256) and rely on that alone? I know option 1 has 288 hash bits and option 2 has only 256, but assume my two choices are the same total hash length. Since I'm dealing with potentially millions of files (and multiple versions of those files over time), I'd like to do what I can to avoid collisions. However, CPU time isn't (completely) free, so I'm interested in how the community feels about the tradeoff - is adding more bits to my hash proportionally more expensive to compute, and are there any advantages to multiple different hashes as opposed to a single, longer hash, given an equal number of bits in both solutions?

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  • CAB file for X86 and X64

    - by ramanakumar
    HI I have created a CAB file for an ActiveX component which is wrapper around a .Net Libray. Here the .Net Library is refering some third party components which are actually build in (X86 or X64) No Any CPU. So My Cab file should be intelligent enogh to install eigther X86 or X64 depending on the client ( Browser) I Know the change should be in the INF file. As i am new to thsi Interoperabilit technology. Please guide me in solving this problem. Thanking you.

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  • exe files and Python

    - by Sorush Rabiee
    i have some questions about python: 1- How to build .exe files from .py files? 2- How to run a program with arguments and receive the result by python code? 3- How to load .NET library in python code (or write python in VS.NET IDE [!?])? 4- is built-in integer of python 3.1 something like a string? it calculates 200! in less than one second and calculates 2^1 to 2^7036 (by a simple recursive algorithm & writing them to a text file) with a 1.75GHz cpu in 4 minuets, so if it is a string, how it can be so fast like this? is there a great difference between memory type and logical calculation of python with c++? 5- what is the best python practice? how can i be an expert?

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  • What alternatives are there to Google App Engine?

    - by Chris Marasti-Georg
    What alternatives are there to GAE, given that I already have a good bit of code working that I would like to keep. In other words, I'm digging python. However, my use case is more of a low number of requests, higher CPU usage type use case, and I'm worried that I may not be able to stay with App Engine forever. I have heard a lot of people talking about Amazon Web Services and other sorts of cloud providers, but I am having a hard time seeing where most of these other offerings provide the range of services (data querying, user authentication, automatic scaling) that App Engine provides. What are my options here?

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  • Passing parameters on the stack

    - by oxinabox.ucc.asn.au
    When you pass parameters to a function on the cpu stack, You put the parameters on then JSR puts the return address on the stack. So that means in your function you must take the top item of the stack (the return address) before you can take the others off) eg is the following the correct way to go about it: ... |Let’s do some addition with a function, MOVE.L #4, -(SP) MOVE.L #5, -(SP) JSR add |the result of the addition (4+5) is in D0 (9) ... add: MOVE.L (SP)+, A1 |store the return address |in a register MOVE.L (SP)+, D0 |get 1st parameter, put in D0 MOVE.L (SP)+, D2 |get 2nd parameter, put in D2 ADD.L D2, D0 |add them, |storing the result in D0 MOVE.L A1, -(SP) |put the address back on the |Stack RTS |return

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  • Problem installing Ruby 1.9.2 with RVM on OSX 10.4

    - by questionmark
    Hi, I successfully installed Ruby 1.8.7 with RVM on OS 10.4. However, when I try to install 1.9.2, I get the following error: make: * [libruby.1.9.1.dylib] Error 1 Installation: [qm]$ rvm install 1.9.2 /Users/qm/.rvm/rubies/ruby-1.9.2-p136, this may take a while depending on your cpu(s)... % ruby-1.9.2-p136 - #fetching % ruby-1.9.2-p136 - #downloading ruby-1.9.2-p136, this may take a while depending on your connection...% ruby-1.9.2-p136 - #extracting ruby-1.9.2-p136 to /Users/qm/.rvm/src/ruby-1.9.2-p136% ruby-1.9.2-p136 - #extracted to /Users/qm/.rvm/src/ruby-1.9.2-p136% ruby-1.9.2-p136 - #configuring % ruby-1.9.2-p136 - #compiling % Error running 'make ', please read /Users/qm/.rvm/log/ruby-1.9.2-p136/make.log% There has been an error while running make. Halting the installation.% Looking at the end of the make log: MACOSX_DEPLOYMENT_TARGET environment variable set to: 10.1 /usr/libexec/gcc/powerpc-apple-darwin8/4.0.1/libtool: internal link edit command failed make: * [libruby.1.9.1.dylib] Error 1 Thanks for any help/suggestions!

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  • TMS320C64x Quick start reference for porgrammers

    - by osgx
    Hello Is thare any quickstart guide for programmers for writing DSP-accelerated appliations for TMS320C64x? I have a program with custom algorythm (not the fft, or usial filtering) and I want to accelerate it using multi-DSP coprocessor. So, how should I modify source to move computation from main CPU to DSPs? What limitations are there for DSP-running code? I have some experience with CUDA. In CUDA I should mark every function as being host, device, or entry point for device (kernel). There are also functions to start kernels and to upload/download data to/from GPU. There are also some limitations, for device code, described in CUDA Reference manual. I hope, there is an similar interface and a documentation for DSP.

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  • How To Make Moving News Bar in C# Desktop Application without Timer

    - by Ehab Sutan
    Hello, I'm making a desktop application in C# which contains a moving News Bar labels. I'm using a timer to move these labels but the problem is that when i make the interval of this timer low (1-10 for example) the application takes very high percentage of CPU Usage, And when i make it higher(200 -500 ) the movement of the labels becomes intermittent or not smooth movement even that the user may not be able to read the news in Comfortable way. Question is : Is there better way to make news Bar moving in a good manner without consuming high resources. Thanks.

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  • TFS and code coverage for web application (MVC) assemblies not working

    - by Andrew
    I've got an MVC web application with associated controller tests that run under a TFS build as per normal. I can see the tests running and passing in the build log and they appear in the "Result details for Any CPU/Release" section of the build I also have a number of other assemblies with associated tests that are running in the same build. Tests are passing and the details are being shown in the results and logs just fine. I've enabled code coverage in the build script and the testrunconfig. The coverage is appearing for all assemblies EXCEPT the web application even though it looks like the tests have been run for it. Is there anything obvious that I have missed or some sort of work around that I need to do? I've searched around for a while and haven't found an answer. Has anyone got code coverage working for MVC web applications?

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  • Visual Studio Performance when editing XAML/Silverlight files

    - by driAn
    When I work on Silverlight projects within Visual Studio 2008, I regularly notice that the XAML editor hangs for up to 10 seconds. This because Visual Studio consumes 100% CPU during that timeframe. Any ideas how I could fix that? I assume this is some kind of background compiling for itellisense or something similiar. It happens during editing, multiple times an hour, without me doing any special actions. System: Server 2008 Std Visual Studio 2008 SP1 latest updates... I wonder if anyone else experienced this issue. Any help would be appreciated.

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  • PhysX for massive performance via GPU ?

    - by devdude
    I recently compared some of the physics engine out there for simulation and game development. Some are free, some are opensource, some are commercial (1 is even very commercial $$$$). Havok, Ode, Newton (aka oxNewton), Bullet, PhysX and "raw" build-in physics in some 3D engines. At some stage I came to conclusion or question: Why should I use anything but NVidia PhysX if I can make use of its amazing performance (if I need it) due to GPU processing ? With future NVidia cards I can expect further improvement independent of the regular CPU generation steps. The SDK is free and it is available for Linux as well. Of course it is a bit of vendor lock-in and it is not opensource. Whats your view or experience ? If you would start right now with development, would you agree with the above ? cheers

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  • Trying to compile VS2008 project on Win 64 bit which is custom Powershell PSSnapin

    - by Boris Kleynbok
    Library Project compiles fine for ANY CPU in VS2008 running on Win 7 64 -bit. Now in the post build following command fails when attemptiong to register library dll: PS C:\Windows\Microsoft.NET\Framework64\v2.0.50727 .\installutil C:\path\Project.dll Exception occurred while initializing the installation: System.BadImageFormatException: Could not load file or assembly 'file:///C:\path\Project.dll' or one of its dependencies. An attempt was made to load a program with an incorrect format.. Do I need to compile the project as x64 I was under impression that AnyCPU will take care of it. Alo my library does have dependencies. Do they also need to be compiled as x64 bit? Any help is appreciated.

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  • shell script output in html + email that html

    - by Kimi
    Using Solaris I have a monitoring script that uses other scripts as plugins. Theses pugins are also scripts which work in difffernt ways like: 1. Sending an alert while high memory uilization 2. High Cpu usage 3. Full disk Space 4. chekcking the core file dump Now all this is dispalyed on my terminal and I want to put them in a HTML file/format and send it as a body of the mail not as attachment. Thanks .

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  • Out of Memory - web applications

    - by Walter White
    Hi all, I am trying to figure out why Jetty 6.1.22 is running out of memory on my laptop. I have 2 web applications running JBoss Seam, Hibernate (with EHCache), and separate Quartz scheduler instances. With little load, the server dies throwing OutOfMemory. What can I look for? Would you think that I am not properly closing handles for input streams or files? I tried profiling my application with Netbeans, but it works off and on. Usually, it ends up locking up even though it doesn't use that much CPU or memory. Walter

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  • Matrix inversion in OpenCL

    - by buchtak
    Hi, I am trying to accelerate some computations using OpenCL and part of the algorithm consists of inverting a matrix. Is there any open-source library or freely available code to compute lu factorization (lapack dgetrf and dgetri) of matrix or general inversion written in OpenCL or CUDA? The matrix is real and square but doesn't have any other special properties besides that. So far, I've managed to find only basic blas matrix-vector operations implementations on gpu. The matrix is rather small, only about 60-100 rows and cols, so it could be computed faster on cpu, but it's used kinda in the middle of the algorithm, so I would have to transfer it to host, calculate the inverse, and then transfer the result back on the device where it's then used in much larger computations.

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  • .NET and 64-bit application

    - by user54064
    I want to make existing .NET applications (WinForms and WebForms) run on 64-bit machines, optimized to take advantage of more memory available on 64-bit machines. What do I need to do to the applications to take advantage of the memory? Do I just select the target CPU as 64-bit? What is the advantage of selecting the target versus just compiling the app for All CPUs and have the .NET optimize the app locally? Will Crystal Reports (in VS 2008) run optimized for 64-bit and take advantage of the upper memory?

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  • SQL Server 2005 standard filegroups / files for performance on SAN

    - by Blootac
    Ok so I've just been on a SQL Server course and we discussed the usage scenarios of multiple filegroups and files when in use over local RAID and local disks but we didn't touch SAN scenarios so my question is as follows; I currently have a 250 gig database running on SQL Server 2005 where some tables have a huge number of writes and others are fairly static. The database and all objects reside in a single file group with a single data file. The log file is also on the same volume. My interpretation is that separate data files should be used across different disks to lessen disk contention and that file groups should be used for partitioning of data. However, with a SAN you obviously don't really have the same issue of disk contention that you do with a small RAID setup (or at least we don't at the moment), and standard edition doesn't support partitioning. So in order to improve parallelism what should I do? My understanding of various Microsoft publications is that if I increase the number of data files, separate threads can act across each file separately. Which leads me to the question how many files should I have. One per core? Should I be putting tables and indexes with high levels of activity in separate file groups, each with the same number of data files as we have cores? Thank you

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  • Fail to profile remote java app using TPTP

    - by rperez
    Hi all, I am trying to profile CPU usage using TPTP. Application to profile run on Linux RH AS5. I installed and configured Agent Controller like described here I ran the java application using the command java '-agentlib:JPIBootLoader=JPIAgent:server=standalone,file=log.trcxml;CGProf' MyApp The monitoring station is All-In-one TPTP version 4.6.2. I followed the stepes described here on Eclipse - on the "Profile Configuration" I choose a new configuration for "Attach to Agent", set the host to my remote linux machine where MyApp is running, test connection succeed and when I get to the "Agents" tab, I see "Pending...", a background process "Feching children for host" is running and can't find anything which makes it impossible to profile. Any idea?

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  • Technologies used in Remote Administration applications(not RD)

    - by Michael
    I want to know what kind of technologies are used nowadays as underlying screen capture engine for remote administration software like VNC pcAnywhere TeamViewer RAC Remote Administrator etc.. The programming language is not so important as just to know whether a driver needs to be developed which is polling video memory 30 times per second or there are any com objects built in the Windows kernel to help doing this? I'm not interested in 3rd party components for doing this. Do I have to use DirectX facilities? Just want some start point to develop my own screen stream capture engine, which will be less CPU hog.

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  • Troubleshooting source of heavy resource-usage on a server 2008 running multiple sites

    - by batman_man
    Hi, I am running about 10 asp.net websites on a hosted virtual server. The server runs Server 2008 - each website is backed by its own database running on SQL server 2008 on the same box. Lately the box has seemed really slow. The only kind of discovery i could think of doing was looking in the task manager, where i can see w3wp and sqlserver.exe jumping to 40% cpu usage every 5-10 seconds. What are the steps i can take to determine which of my websites is taking these resources and or what database is getting hit the most? I have of course ssms installed on the machine as well. As you can tell, my sysadmin skills are very very limited - any help would be much appreciated.

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  • is it possible to request UIWebView using user agent as Safari on iPhone?

    - by RAGOpoR
    i try to request on my application via this url http://reader.mac.com/mobile/v1/http%3A%2F%2Ffeeds.feedburner.com%2F9To5Mac-MacAllDay and it also return that it available on iPhone only how can i fix it? mycode NSMutableURLRequest *urlRequest = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString: myurl]]; [urlRequest setValue: @"iPhone" forHTTPHeaderField: @"Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7A341 Safari/528.16"]; [self.myWebView loadRequest:urlRequest];

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  • Accessing frame info in gdb

    - by Maelstrom
    In gdb, is there a way to access the contents of info frame in a script? I'm debugging a problem somewhere between Apache, PHP, APC and my own code, and I have about a hundred cores to choose from. Following the instructions here http://bugs.php.net/bugs-generating-backtrace.php I end up with a stacktrace like: #0 0x0121a31a in do_bind_function (opline=0xa94dd750, function_table=0x9b9cf98, compile_time=0 '\0') at /usr/src/debug/php-5.2.7/Zend/zend_compile.c:2407 #1 0x0124bb2e in ZEND_DECLARE_FUNCTION_SPEC_HANDLER (execute_data=0xbfef7990) at /usr/src/debug/php-5.2.7/Zend/zend_vm_execute.h:498 #2 0x01249dfa in execute (op_array=0xb79d5d3c) at /usr/src/debug/php-5.2.7/Zend/zend_vm_execute.h:92 #3 0x01261e31 in ZEND_INCLUDE_OR_EVAL_SPEC_VAR_HANDLER (execute_data=0xbfef80d0) at /usr/src/debug/php-5.2.7/Zend/zend_vm_execute.h:7809 #4 0x01249dfa in execute (op_array=0xb79d55ec) at /usr/src/debug/php-5.2.7/Zend/zend_vm_execute.h:92 ... #26 0x09caa894 in ?? () #27 0x00000000 in ?? () The stack will always look similar, with function execute and ZEND_something interleaved several times. I need to go up to the last instance of execute (up 2 in this case) and print myVar. Obviously gdb knows the function names, but does it surface them in any user variables I could access? Typing frame 2 shows a one-line version, and info frame shows a single stackframe in detail. I want to do something like while ($current_frame.function_name != "execute") {up;} print myVar but I don't see how to do it strictly within gdb. Is there a variable / structure / special memory location / something that allows access to gdb's information on either the whole stack (like bt) or to the current stack frame (like info frame)?

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  • Visual Studio 2008 Build question x64 vs x86

    - by Brett
    Hi Everyone, I have written an application on my x64 machine in Visual Stuido 2008. The application will be sent to someone, and I have two questions that I need answers to. What requirements will they need to have installed. I am assuming the .NET 3.5 redistributable. Are there anything else though? (The application does not call any external dependencies). This is my realy question that I can't find the answer to. I have developed and build the application on my x64 machine using the "Any CPU" option (as versus x64 or x86 specifically). Will this run on a 32 bit machine? (I don't have one to test). Or do I need to build it specifically for x86 in order to run it on a 32 bit machine? Many thanks, Brett

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  • Slow insert speed in Postgresql memory tablespace

    - by Prashant
    Hi, I have a requirement where I need to store the records at rate of 10,000 records/sec into a database (with indexing on a few fields). Number of columns in one record is 25. I am doing a batch insert of 100,000 records in one transaction block. To improve the insertion rate, I changed the tablespace from disk to RAM.With that I am able to achieve only 5,000 inserts per second. I have also done the following tuning in the postgres config: Indexes : no fsync : false logging : disabled Other information: - Tablespace : RAM - Number of columns in one row : 25 (mostly integers) - CPU : 4 core, 2.5 GHz - RAM : 48 GB I am wondering why a single insert query is taking around 0.2 msec on average when database is not writing anything on disk (as I am using RAM based tablespace). Is there something I am doing wrong? Help appreciated. Prashant

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  • Aero Snap not working for my application

    - by Magnus Österlind
    I have a problem with Aero Snap not working with the application I'm working on (Windows desktop, native C++ application), and I'm a bit confused as to what's happening, as it seems like it should just work, out of the box. I've used Spy++ on a mininal win32 application, and get the following messages when I press Win-Left: <00070 00030D1C P WM_KEYDOWN nVirtKey:VK_LWIN cRepeat:1 ScanCode:5B fRepeat:0 fUp:0 <00071 00030D1C P WM_KEYDOWN nVirtKey:VK_LWIN cRepeat:1 ScanCode:5B fRepeat:1 fUp:0 <00072 00030D1C P WM_KEYDOWN nVirtKey:VK_LWIN cRepeat:1 ScanCode:5B fRepeat:1 fUp:0 <00088 00030D1C S WM_GETMINMAXINFO lpmmi:0043FCBC <00089 00030D1C R WM_GETMINMAXINFO lpmmi:0043FCBC <00090 00030D1C S WM_WINDOWPOSCHANGING lpwp:0043FCC4 <00091 00030D1C S WM_GETMINMAXINFO lpmmi:0043F8E8 <00092 00030D1C R WM_GETMINMAXINFO lpmmi:0043F8E8 <00093 00030D1C R WM_WINDOWPOSCHANGING .. and so on So I can see that the WM_KEYDOWN for the left key isn't reaching the application, but I'm getting the aero snap "resize window" stuff instead. When I Spy++ my application, I can see that the left key isn't being "intercepted", but instead being passed on to the application, so I don't get any snapping goodness. <00043 000F0F12 P WM_KEYDOWN nVirtKey:VK_LWIN cRepeat:1 ScanCode:5B fRepeat:0 fUp:0 <00044 000F0F12 P WM_KEYDOWN nVirtKey:VK_LWIN cRepeat:1 ScanCode:5B fRepeat:1 fUp:0 <00045 000F0F12 P WM_KEYDOWN nVirtKey:VK_LWIN cRepeat:1 ScanCode:5B fRepeat:1 fUp:0 <00060 000F0F12 P WM_KEYUP nVirtKey:VK_LEFT cRepeat:1 ScanCode:4B fRepeat:0 fUp:1 I'm going to dig into the cores of our message handling and see what's going on, but I'll take all the tips I can get :)

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