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  • Strlen of MAX 16 chars string using bitwise operators

    - by fabrizioM
    The challenge is to find the fastest way to determine in C/C++ the length of a c-string using bitwise operations in C. char thestring[16]; The c-string has a max size of 16 chars and is inside a buffer If the string is equal to 16 chars doesn't have the null byte at the end. I am sure can be done but didn't got it right yet. I am working on this at the moment, but assuming the string is memcpied on a zero-filled buffer. len = buff[0] != 0x0 + buff[1] != 0x0 + buff[2] != 0x0 + buff[3] != 0x0 + buff[4] != 0x0 + buff[5] != 0x0 + buff[6] != 0x0 + buff[7] != 0x0 + buff[8] != 0x0 + buff[9] != 0x0 + buff[10] != 0x0 + buff[11] != 0x0 + buff[12] != 0x0 + buff[13] != 0x0 + buff[14] != 0x0 + buff[15] != 0x0;

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  • enable profiler / Traceon after SQL server restart automatically

    - by Nikhil
    hi, My client is facing some deadlocks while using our application. I want to track all the deadlocks for my research and to solve the deadlocks. i am currently run the SQL profiler for the event deadlock graph to capture the deadlock scenario. the actual problem is that the SQL server gets restarted every day at 2 am, and the profiler stops capturing the events after the restart. by the time i come to office at start the profiler at say 10 am, there could be deadlocks which i could have missed between 2 am and 10 am. so i am looking for a way so i can capture the deadlocks without me starting manually. i thought i could use TRACEON(1204,-1) so that the deadlock events get captured in the SQL Server error logs. But i found that the TRACE capturing too gets disabled after the restart. Is there a way i can capture the deadlocks either by SQL profiler or by using TRACEON without me manually starting the capturing? Nikhil

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  • JavaScript replace with callback - performance question

    - by Tomalak
    In JavaScript, you can define a callback handler in regex string replace operations: str.replace(/str[123]|etc/, replaceCallback); Imagine you have a lookup object of strings and replacements. var lookup = {"str1": "repl1", "str2": "repl2", "str3": "repl3", "etc": "etc" }; and this callback function: var replaceCallback = function(match) { if (lookup[match]) return lookup[match]; else return match; } How would you assess the performance of the above callback? Are there solid ways to improve it? Would if (match in lookup) //.... or even return lookup[match] | match; lead to opportunities for the JS compiler to optimize, or is it all the same thing?

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  • How can I provide a different rendering target to Direct2D?

    - by fingerprint211b
    I'm using Direct2D in C# to render a small gui framework for my research project. I'm not very used to working on Windows or with DirectX. I'm using a Windows Forms control to create a render target, and msdn warns that since it uses BindDC, a the larger the rendering target, the worse the performance will be (which turned out to be a dramatic difference, when I maximize the window, I get around 15 fps). What would be a better way to create a render target for Direct2D? Is there a way to create a window and render directly to it, instead of rendering to a control's buffer first, and then rendering that? If so, how? Sorry if my English sucks, not my native language.

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  • How to rotate an SSE/AVX vector

    - by user1584773
    I need to perform a rotate operation with as little clock cycle as possible. In the first case let's assume __m128i as source and dest type source: || A0 || A1 || A2 || A3 || dest : || A1 || A2 || A3 || A0 || dest = (__m128i)_mm_shuffle_epi32((__m128i)source, _MM_SHUFFLE(0,3,2,1)); Now I want to do the same whit AVX intrinsics So let's assume this time __m256i as source and dest type source: || A0 || A1 || A2 || A3 || A4 || A5 || A6 || A7 || dest : || A1 || A2 || A3 || A4 || A5 || A6 || A7 || A0 || The Avx intrinsics is missing most of the corresponding SSE integer operations. Maybe there is some way go get the desider output working with the floating point version. I've tryed with: dest = (__m256i)_mm256_shuffle_ps((__m256)source, (__m256)source, _MM_SHUFFLE(0,3,2,1)); but what I get is: || A0 || A2 || A3 || A4 || A5 || A6 || A7 || A1 || Any Idea on how to solve this in an efficient way? (without mixing SSE and AVX operation and without "manually" inverting A0 and A1 Thanks in advance!

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  • Career Day in kindergarten: how to demonstrate programming in 20 minutes?

    - by Péter Török
    I was invited to the kindergarten group of my elder daughter to talk, and aswer the kids' questions, about my profession. There are 26 kids of age 4-6 in the group (plus 3 teachers who are fairly scared of anything related to programming and IT themselves, but bold enough to learn new tricks). I would have about 20-30 minutes, without projector or anything. (They have an old computer though, which by its look may be a 486, and I am not even sure if it's functioning.) My research turned up excellent earlier threads, with lots of good tips: How would you explain your job to a 5-year old? Career Day: how do I make “computer programmer” sound cool to 8 year olds? What things can I teach a group of children about programming in one day? My situation is different from each of the above though. So any advice on how to teach the kids (and their teachers) in a fun way about programming is appreciated.

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  • DbDataReader with DbTransactions

    - by Gustavo Paulillo
    Its the wrong way or lack of performance, using DbDataReader combinated with DbTransactions? An example of code: public DbDataReader ExecuteReader() { try { if (this._baseConnection.State == ConnectionState.Closed) this._baseConnection.Open(); if (this._baseCommand.Transaction != null) return this._baseCommand.ExecuteReader(); return this._baseCommand.ExecuteReader(CommandBehavior.CloseConnection); } catch (Exception excp) { if (this._baseCommand.Transaction != null) this._baseCommand.Transaction.Rollback(); this._baseCommand.CommandText = string.Empty; this._baseConnection.Close(); throw new Exception(excp.Message); } } Some methods call this operation. Sometimes openning a DbTransaction. Its using DbConnection and DbCommand. The real problem, is in production enviroment (like 5,000 access/day) the ADO operations start throwing exceptions

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  • (Google AppEngine) Memcache Lock Entry

    - by Friedrich
    Hi, i need a locking in memcache. Since all operations are atomic that should be an easy task. My idea is to use a basic spin-lock mechanism. So every object that needs locking in memcache gets a lock object, which will be polled for access. // pseudo code // try to get a lock int lock; do { lock = Memcache.increment("lock", 1); } while(lock != 1) // ok we got the lock // do something here // and finally unlock Memcache.put("lock", 0); How does such a solution perform? Do you have a better idea how to lock a memcache object? Best regards, Friedrich Schick

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  • Auto refresh web page

    - by Epitaph
    I have a web page which allows the user to carry out various operations that in turn modify the database. Also, this web application needs to keep track of various fields in database that keep changing with time. Is refreshing the page every few seconds the best possible way to implement this? For example, if there is a long list on the page requiring scrolling, it is hard to view the list since the page keeps resetting due to the refresh. I know, there are ways to retain the position of the scroll. But, could I use something more efficient?

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  • Normalize or Denormalize in high traffic websites

    - by Inam Jameel
    what is the best practice for database design for high traffic websites like this one stackoverflow? should one must use normalize database for record keeping or normalized technique or combination of both? is it sensible to design normalize database as main database for record keeping to reduce redundancy and at the same time maintain another denormalized form of database for fast searching? or main database should be denormalize and one can make normalized views in the application level for fast database operations? or beside above mentioned approach? what is the best practice of designing high traffic websites???

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  • Refferenced by projects .net 4.0 assemblies have no IL. How? and What for?

    - by er-v
    There is something I don't understand. Today I desided to find out what is inside Sistem.Web.dll version 4.0.0.0 So I decided to find the place where this assembly located. and opened this assembly with reflector - all methods were empty - and then with ilDasm from 7.0 SDK. This what I saw After some research I've found fullfeatured assemblies in gac. Actualy here C:\Windows\assembly\NativeImages_v4.0.30319_32\System.Web\82087f17d3b3f9c493e7261d608a6af4 They are much larger in size. So why does references goes not to the gac, but to the C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\ Why don't they have IL inside? How does it works? Mabe I don't understand something.

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  • MDX performance vs. T-SQL

    - by SubPortal
    I have a database containing tables with more than 600 million records and a set of stored procedures that make complex search operations on the database. The performance of the stored procedures is so slow even with suitable indexes on the tables. The design of the database is a normal relational db design. I want to change the database design to be multidimensional and use the MDX queries instead of the traditional T-SQL queries but the question is: Is the MDX query better than the traditional T-SQL query with regard to performance? and if yes, to what extent will that improve the performance of the queries? Thanks for any help.

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  • Curl_errno=55, "Failed sending network data."

    - by 4dplane
    Hi all: I have a php script that updates a database via an api. This script works on one server but not on another. Both servers have curl enabled and they have php 5.2.6 or above. The error happens in the do_put() method. The rest of the script seems to be fine. I have found that: curl_errno= 55 = "Failed sending network data". curl_error= select/poll returned error <?php //phpinfo(); require_once "class.DelveAuthUtil.php"; $access_key = ""; $secret = "W"; $org_id = ""; $media_id = ""; $new_tag_name = "uvideo"; $assign_tag_to_media_url = "http://api..com/rest/organizations/$org_id/media/$media_id/properties/tags/$new_tag_name"; $signed_create_new_tag_url = DAU::authenticate_request("PUT", $assign_tag_to_media_url, $access_key, $secret); # perform the creation of the new custom property $put_response = do_put($signed_create_new_tag_url); # Execute the POST function do_post($url, $params=array()) { # Combine parameters $param_string = ""; foreach ($params as $key => $value) { $value = urlencode($value); $param_string = $param_string . "&$key=$value"; } // Get the curl session object $session = curl_init($url); // Set the POST options. curl_setopt ($session, CURLOPT_POST, true); curl_setopt ($session, CURLOPT_POSTFIELDS, $param_string); curl_setopt($session, CURLOPT_HEADER, false); curl_setopt($session, CURLOPT_RETURNTRANSFER, true); // Do the POST and then close the session $response = curl_exec($session); curl_close($session); return $response; } # Execute the PUT function do_put($url) { // Get the curl session object $session = curl_init($url); print(" <br> session= " . $session . "<br>"); // Set the PUT options. print ("opt0= " . curl_setopt($session, CURLOPT_VERBOSE, TRUE) . "<br>"); print ("opt1= " . curl_setopt ($session, CURLOPT_PUT, true) . "<br>"); print ("opt2= " . curl_setopt ($session, CURLOPT_HEADER, false) . "<br>"); print ("opt3= " . curl_setopt ($session, CURLOPT_RETURNTRANSFER, true) . "<br>"); // Do the PUT and then close the session $response = curl_exec($session); if (curl_errno($session)) { print ( "curl_errno= " . curl_errno($session). "<br>"); print( "curl_error= " . curl_error($session) . "<br>"); } else { curl_close($session); } } I have small lead in the Apache log - there is an SSL issue that I do not know how to resolve. [Thu Mar 25 15:57:58 2010] [warn] Init: You should not use name-based virtual hosts in conjunction with SSL!! [Thu Mar 25 15:57:58 2010] [notice] Apache/2.2.3 (CentOS) configured -- resuming normal operations [Thu Mar 25 15:58:59 2010] [notice] caught SIGTERM, shutting down [Thu Mar 25 15:58:59 2010] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec) [Thu Mar 25 15:58:59 2010] [warn] RSA server certificate is a CA certificate (BasicConstraints: CA == TRUE !?) [Thu Mar 25 15:58:59 2010] [warn] RSA server certificate CommonName (CN) `yourvps.a2hosting.com' does NOT match server name!? [Thu Mar 25 15:58:59 2010] [warn] RSA server certificate is a CA certificate (BasicConstraints: CA == TRUE !?) [Thu Mar 25 15:58:59 2010] [warn] RSA server certificate CommonName (CN) `yourvps.a2hosting.com' does NOT match server name!? [Thu Mar 25 15:58:59 2010] [warn] Init: SSL server IP/port conflict: my1.com:443 (/home/httpd/my.com/conf/kloxo.my1.com:69) vs. elggtest.my1.com:443 (/home/httpd/elggtest.my1.com/conf/kloxo.elggtest.my1.com:71) [Thu Mar 25 15:58:59 2010] [warn] Init: You should not use name-based virtual hosts in conjunction with SSL!! [Thu Mar 25 15:58:59 2010] [notice] Digest: generating secret for digest authentication ... [Thu Mar 25 15:58:59 2010] [notice] Digest: done [Thu Mar 25 15:59:00 2010] [warn] RSA server certificate is a CA certificate (BasicConstraints: CA == TRUE !?) [Thu Mar 25 15:59:00 2010] [warn] RSA server certificate CommonName (CN) `yourvps.a2hosting.com' does NOT match server name!? [Thu Mar 25 15:59:00 2010] [warn] RSA server certificate is a CA certificate (BasicConstraints: CA == TRUE !?) [Thu Mar 25 15:59:00 2010] [warn] RSA server certificate CommonName (CN) `yourvps.a2hosting.com' does NOT match server name!? [Thu Mar 25 15:59:00 2010] [warn] Init: SSL server IP/port conflict: my1.com:443 (/home/httpd/my1.com/conf/kloxo.my1.com:69) vs. elggtest.my1.com:443 (/home/httpd/elggtest.my1.com/conf/kloxo.elggtest.my1.com:71) [Thu Mar 25 15:59:00 2010] [warn] Init: You should not use name-based virtual hosts in conjunction with SSL!! [Thu Mar 25 15:59:00 2010] [notice] Apache/2.2.3 (CentOS) configured -- resuming normal operations[/PHP] Any help would be great! Thanks, 4dplane

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  • How do I close a database connection in a WCF service?

    - by Dan
    I have been unable to find any documentation on properly closing database connections in WCF service operations. I have a service that returns a streamed response through the following method. public virtual Message GetData() { string sqlString = BuildSqlString(); SqlConnection conn = Utils.GetConnection(); SqlCommand cmd = new SqlCommand(sqlString, conn); XmlReader xr = cmd.ExecuteXmlReader(); Message msg = Message.CreateMessage( OperationContext.Current.IncomingMessageVersion, GetResponseAction(), xr); return msg; } I cannot close the connection within the method or the streaming of the response message will be terminated. Since control returns to the WCF system after the completion of that method, I don't know how I can close that connection afterwards. Any suggestions or pointers to additional documentation would be appreciated. Dan

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  • Msysgit bash is horrendously slow in Windows 7

    - by Kevin L.
    I love git and use it on OSX pretty much constantly at home. At work, we use svn on Windows, but want to migrate to git as soon as the tools have fully matured (not just TortoiseGit, but also something akin the really nice Visual Studio integration provided by VisualSVN). But I digress... I recently installed msysgit on my Windows 7 machine, and when using the included version of bash, it is horrendously slow. And not just the git operations; clear takes about five seconds. AAAAH! Has anyone experienced a similar issue?

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  • WCF: Use a Message Contract to make a Soap Header

    - by Vaccano
    I need to add a soap header to my web service. I plan to use this to validate my clients (Windows Mobile Devices). I found this link: http://www.c-sharpcorner.com/UploadFile/rog_21/soapheaders05172007120046PM/soapheaders.aspx Which is exactly what I want to do. But it is not written for WCF. I have done some research and I seem to be paralyzed by the number of options. I basically want to add a simple header to my soap object that will be a user name and password. The client does not use WCF, so the soap header needs to just be a normal soap header. Any Sample code or shoves in the right direction would be appreciated.

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  • Doctrine Mssql uniqueidentifier isn't cast as char or nvarchar when retrieved from the database.

    - by Tres
    When I retrieve a record from the database which has a column of type "uniqueidentifier", Doctrine fills it with "null" rather than the unique id from the database. Some research and testing has brought this down to a PDO/dblib driver issue. When directly querying via PDO, null is returned in place of the unique id. For reference, http://trac.doctrine-project.org/ticket/1096, has a bit on this, however, it was updated 11 months ago with no comment for resolution. A way around this, as mentioned at http://bugs.php.net/bug.php?id=24752&edit=1, is to cast the column as a char. However, it doesn't seem Doctrine exposes the native field type outside of generating models which makes it a bit hard to detect uniqueidentifier types and cast them internally when building the sql query. Has anyone found a workaround for this?

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  • Nielson's usablity scale

    - by Banderdash
    Just wondering if anyone out there knows of a standard survey (preferably based off Jacob Nielson's work on usability) that web admin's can administer to test groups for usability? I could just make up my own but I feel there as got to be some solid research out there on the sort of judgments on tasks I should be asking. For example Q:: Ask user to find profile page Do I ... A.) Present them with standard likert scale after each question B.) Present them the likert after all the questions .. Then what should that likert be, I know Nielson's usability judgments scale is based on Learnability, Efficiency of Use, Memorability, Error Rate, Satisfaction but I can only imagine a likert I would design that would effectively measure satisfaction...how am I suppose to ask a user to rank the Memorability of a site after one use on a 1-5 scale? Surely someone has devised a good way to pose the question?

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  • Getting ID of an instance newly launched with ec2-api-tools

    - by Jonik
    I'm launching an EC2 instance, by invoking ec2-run-instances from simple a bash script, and want to perform further operations on that instance (e.g. associate elastic IP), for which I need the instance id. The command is something like ec2-run-instances ami-dd8ea5a9 -K pk.pem -C cert.pem --region eu-west-1 -t c1.medium -n 1, and its output: RESERVATION r-b6ea58c1 696664755663 default INSTANCE i-945af9e3 ami-dd8ea5b9 pending 0 c1.medium 2010-04-15T10:47:56+0000 eu-west-1a aki-b02a01c4 ari-39c2e94d In this example, i-945af9e3 is the id I'm after. So, I'd need a simple way to parse the id from what the command returns - how would you go about doing it? My AWK is a little rusty... Feel free to use any tool available on a typical Linux box. (If there's a way to get it directly using EC2-API-tools, all the better. But afaik there's no EC2 command to e.g. return the id of the most recently launched instance.)

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  • Microsoft T-SQL to Oracle PL/SQL translation

    - by Michael Prewecki
    I've worked with T-SQL for years but i've just moved to an organisation that is going to require writing some Oracle stuff, probably just simple CRUD operations at least until I find my feet. I'm not going to be migrating databases from one to the other simply interacting with existing Oracle databases from an Application Development perspective. Is there are tool or utility available to easily translate T-SQL into PL/SQL, a keyword mapper is the sort of thing I'm looking for. P.S. I'm too lazy to RTFM, besides it's not going to be a big part of my role so I just want something to get me up to speed a little faster.

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  • ASP.Net MVC and N-Tier

    - by Damien
    Greetings, Apologies in advance that I have not researched this toughly enough to answer the question myself, but I imagine it would take me some time and I would rather know now before I invest more time in learning it. I couldn't find anything in my initial research.. Why use ASP.Net MVC if your already using a multi-tier architecture (Data Layer, Logic Layer, Presentation Layer)? Other than the fact the controller has more power than the logic layer. Am I right in thinking I can use nHibernate and all my data access classes, entities, and mappings in the Model part of the MVC? When using controllers, is it best to separate a lot of the logic into a separate class so I can call it from multiple controllers? Or can I call them from the controllers themselves, considering the fact that I would not want all of them to be Actions, just normal methods. Thanks

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  • Source control products that support linked/shared files?

    - by Ian Boyd
    We're interested in moving from a source control system that supports the concept of shared or linked files. A shared file means: a file modified in one project, is automatically updated changed in every other project that uses that same file. It does this without a developer having to request it, reverse-integrate it, ask for it, or even want it. We're trying to see if any other commonly used source-control systems can meet our needs, and include linked or shared files. My limited research shows that: Team Foundation Server doesn't support sharing files Subversion doesn't support sharing files (including Externals) CVS doesn't support sharing files (including Modules) Anything else? (besides our current source control product, obviously) References Subversion and shared files across repositories/projects? How to share files between CVS projects? Will TFS ever support shared files for projects under source control?

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  • Does anyone have any EPiServer Exam Tips?

    - by gilles27
    Myself and some colleagues have just been told that we are all taking the EPiServer CMS certification exam on Friday. Having done some research on the web it does sound like a challenging exam - I've heard that only one in six people pass it. There doesn't seem to be much in the way of learning material, beyond what is described on the EPiServer site, this blog post and this blog post. Has anyone else out there passed recently and if so can they provide any hints or tips? Any help would be appreciated.

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  • Which OOD approach should I take?

    - by Sorush Rabiee
    According to Niklaus Wirth, Algorithms + Data Structures = Programs. So I use this as a start point to object-oriented modeling and inheritance design: in a way that I separate the 'Objects' from 'Operations'. then look for patterns and inheritance hierarchy. But now after practice I guess it's not a good idea for every modeling problem, because sometimes it's not effective. (I mean there is no possibility of developing (or is very hard to develop) codes of Turing-Completed languages based on this paradigm.) What is your viewpoint for designing an OOD structure as an experienced programmer?

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  • Core Data store corruption

    - by sehugg
    A handful of customers for my iPhone app are experiencing Core Data store corruption (I assume so, since the error is "Failed to save to data store: Operation could not be completed. (Cocoa error 259.)") Has anyone else experienced this kind of store corruption? I am worried since I aim to soon push an update which performs a schema migration, and I am worried that this will expose even more problems. I had assumed that the Core Data/SQLlite APIs use atomic operations and are immune to corruption except if the underlying filesystem experiences corruption. Is there a way to reduce/prevent corruption, or at least a good way to reproduce (I have been unsuccessful thus far).

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