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  • File `siunitx.sty' not found

    - by Mehdi
    I switched to Ubuntu from windows today and got lots of problems. here is one of them. I installed Texlive and had trouble figuring out hove to add the PATH to .bashrc file. anyway, I figured it out using this link http://ubuntuforums.org/archive/index.php/t-1359211.html but still I can not compile my latex code. I get such error: "File `siunitx.sty' not found" however, I think it is only the problem of not properly configured path. I would greatly appreciate if somebody help as I have already spent full half day on this but no success yet. Mehdi

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  • Introducing UPK 3.6 Simulation Help (You Say It and We Do It!)

    - by kathryn.lustenberger(at)oracle.com
    We would like to thank everyone that participated in the recent documentation survey that was conducted over the last several months. Your feedback is valuable and we appreciate the time you took to provide it. Many of you commented that you would like to have "UPKs for UPK" in the documentation. In response, we are pleased to announce the availability of Simulation Help. This unique help system is a blending of the text-based Developer help and a collection of approximately 200 simulations that show authors how to create, record, refine, localize, and publish content using the Developer. You can access Simulation Help at any time using the following link: http://download.oracle.com/technology/products/upk/index.html Save this link as a favorite or bookmark in your browser for easy access anytime. We have also provided a link to a short one-question survey so you can tell us what you think of the new Simulation Help. http://www.surveymonkey.com/s/BJT7LV6 Thanks again for your valuable feedback on the product documentation!

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  • Introducing UPK 3.6 Simulation Help (You Say It and We Do It!)

    - by marc.santosusso
    We would like to thank everyone that participated in the recent documentation survey that was conducted over the last several months. Your feedback is valuable and we appreciate the time you took to provide it. Many of you commented that you would like to have "UPKs for UPK" in the documentation. In response, we are pleased to announce the availability of Simulation Help. This unique help system is a blending of the text-based Developer help and a collection of approximately 200 simulations that show authors how to create, record, refine, localize, and publish content using the Developer. You can access Simulation Help at any time using the following link: http://download.oracle.com/technology/products/upk/index.html Save this link as a favorite or bookmark in your browser for easy access anytime. We have also provided a link to a short one-question survey so you can tell us what you think of the new Simulation Help. http://www.surveymonkey.com/s/BJT7LV6 Thanks again for your valuable feedback on the product documentation!

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  • What can Haskell's type system do that Java's can't?

    - by Matt Fenwick
    I was talking to a friend about the differences between the type systems of Haskell and Java. He asked me what Haskell's could do that Java's couldn't, and I realized that I didn't know. After thinking for a while, I came up with a very short list of minor differences. Not being heavy into type theory, I'm left wondering whether they're formally equivalent. To try and keep this from becoming a subjective question, I'm asking: what are the major, non-syntactical differences between their type systems? I realize some things are easier/harder in one than in the other, and I'm not interested in talking about those. And to make it more specific, let's ignore Haskell type extensions since there's so many out there that do all kinds of crazy/cool stuff.

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  • Permissions problem when copying files to /usr/share/tomcat6

    - by Nazar Hussain S
    Hi, I am running springsource framework in ubuntu 10.01. In my home folder, I have installed springsource IDE. I have my tomcat6 appserver in the /usr/share/tomcat6. While executing a sample project springapp, I have created the springapp dir in /users/share/tomcat6/webapps/ folder using sudo as I am unable to do it directly. On running the ant deploy or ant deploywar command, I am unable to copy the sample file -index.jsp from my workspace in springsource IDE to springapp dir in /usr/share/tomcat6/webapps as I am getting the error permission denied while copying the .jsp file. Can anybody please provide suggestion as to how to overcome this issue? Regards

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  • 12.04 Ubuntu studio PREEMPT_RT kernel options

    - by Nate Iverson
    My audio processing needs require a preempt_rt kernel. I roughly followed the guide: https://wiki.ubuntu.com/KernelTeam/GitKernelBuild with a little help from: https://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO Currently I am using the 3.4 branch (which is the most recent at the time of this post): http://www.kernel.org/pub/linux/kernel/projects/rt/ I think I have a reasonable kernel config ( for my machine at least ). Multiple trials confirm I need the option: CONFIG_PREEMPT_RT_FULL=y I have the following questions: Is anyone maintaining a recent CONFIG_PREEMPT_RT_FULL kernel in a ppa? Is there any interest in providing a CONFIG_PREEMPT_RT_FULL in the official ubuntu-studio distribution? Does anyone have recent config pointers for a CONFIG_PREEMPT_RT_FULL kernel?

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  • Changes to keyboard layout resetted on restart

    - by Matthieu Napoli
    I edited /usr/share/X11/xkb/symbols/fr to customize the french-dvorak layout. I then selected french-dvorak layout (instead of french). Now when I restart Ubuntu, I end up with the non-edited french-dvorak (my changes are ignored). But if I switch to french, then back to french-dvorak, my changes are now taken into account... How can I have my custom french-dvorak on startup? Is there some sort of cached version of the keyboard layout? I don't understand how it can switch me to the official french-dvorak because I changed it, so it should no longer exist.

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  • Ralink RT3060 Driver not working

    - by Hoerlle
    I am new to linux. I was using fedora and now switching to Ubuntu for a try. On Fedora my wireless network card was working OK from the OS install (I didnt had to do anything for it to work) On Ubuntu, with the lspci -v command, I get: Network controller: Ralink corp. RT3060 Wireless 802.11n 1T/1R Subsystem: Ralink corp. RT3060 Wireless 802.11n 1T/1R Flags: bus master, slow devsel, latency 64, IRQ 20 Memory at fe9e0000 (32-bit, non-prefetchable) [size=64K] Capabilities: <access denied> Kernel driver in use: rt2800pci Kernel modules: rt2800pci But I am not able to find any wireless network. What to do now? Thanks

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  • What changed with timidity, alsa and jack in 11.10?

    - by Dave
    I (just) upgraded from 11.4 to 11.10 and noticed some differences in the behavior of timidity. I used to (11.4) exectute >timidity midifile.midi without running jackd, and thus using alsa (or pulseaudio?) to produce sound from midi files. Now having upgraded, this does not work -- currently this command just freezes if jack is not running. If jack is running, it does work but there is an initial audio glitch (noise burst at the start of playback, analogous to the sound of a plug being inserted) that I'd rather not have to deal with. All the indications that I have is that in 11.10 timidity will only work (albeit glitchy) with jack on, whereas in 11.4 it did not require this. Is there any way to restore timidity's non-jack operation in 11.10? Is there a way to get rid of the audio glitch in with jack operation? Overall, what underlying changes in these programs and the audio infrastructure are behind this?

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  • Swept AABB vs Line Segment 2D

    - by Larolaro
    I've really exhausted as much as Google has to give, I've spent a solid week googling every combination of words for an "AABBvsLine sweep", downloaded countless collision demos, dissected SAT intersection examples and an AABBvsAABB sweep trying to figure out how to approach this. I've not found a single thing covering this specific pairing. Can anyone shed any light on how to get the hit time of a swept AABB vs a Line segment in 2D? I'm still getting familiar with the SAT but I do know how to implement it to a degree, I'm just not sure how to extract the hit time from the velocity in the non axis aligned separating axes for the sweep. I really would appreciate anything at the moment, some code or even some helpful links, I'm at my wits end!

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  • New Replication, Optimizer and High Availability features in MySQL 5.6.5!

    - by Rob Young
    As the Product Manager for the MySQL database it is always great to announce when the MySQL Engineering team delivers another great product release.  As a field DBA and developer it is even better when that release contains improvements and innovation that I know will help those currently using MySQL for apps that range from modest intranet sites to the most highly trafficked web sites on the web.  That said, it is my pleasure to take my hat off to MySQL Engineering for today's release of the MySQL 5.6.5 Development Milestone Release ("DMR"). The new highlighted features in MySQL 5.6.5 are discussed here: New Self-Healing Replication ClustersThe 5.6.5 DMR improves MySQL Replication by adding Global Transaction Ids and automated utilities for self-healing Replication clusters.  Prior to 5.6.5 this has been somewhat of a pain point for MySQL users with most developing custom solutions or looking to costly, complex third-party solutions for these capabilities.  With 5.6.5 these shackles are all but removed by a solution that is included with the GPL version of the database and supporting GPL tools.  You can learn all about the details of the great, problem solving Replication features in MySQL 5.6 in Mat Keep's Developer Zone article.  New Replication Administration and Failover UtilitiesAs mentioned above, the new Replication features, Global Transaction Ids specifically, are now supported by a set of automated GPL utilities that leverage the new GTIDs to provide administration and manual or auto failover to the most up to date slave (that is the default, but user configurable if needed) in the event of a master failure. The new utilities, along with links to Engineering related blogs, are discussed in detail in the DevZone Article noted above. Better Query Optimization and ThroughputThe MySQL Optimizer team continues to amaze with the latest round of improvements in 5.6.5. Along with much refactoring of the legacy code base, the Optimizer team has improved complex query optimization and throughput by adding these functional improvements: Subquery Optimizations - Subqueries are now included in the Optimizer path for runtime optimization.  Better throughput of nested queries enables application developers to simplify and consolidate multiple queries and result sets into a single unit or work. Optimizer now uses CURRENT_TIMESTAMP as default for DATETIME columns - For simplification, this eliminates the need for application developers to assign this value when a column of this type is blank by default. Optimizations for Range based queries - Optimizer now uses ready statistics vs Index based scans for queries with multiple range values. Optimizations for queries using filesort and ORDER BY.  Optimization criteria/decision on execution method is done now at optimization vs parsing stage. Print EXPLAIN in JSON format for hierarchical readability and Enterprise tool consumption. You can learn the details about these new features as well all of the Optimizer based improvements in MySQL 5.6 by following the Optimizer team blog. You can download and try the MySQL 5.6.5 DMR here. (look under "Development Releases")  Please let us know what you think!  The new HA utilities for Replication Administration and Failover are available as part of the MySQL Workbench Community Edition, which you can download here .Also New in MySQL LabsAs has become our tradition when announcing DMRs we also like to provide "Early Access" development features to the MySQL Community via the MySQL Labs.  Today is no exception as we are also releasing the following to Labs for you to download, try and let us know your thoughts on where we need to improve:InnoDB Online OperationsMySQL 5.6 now provides Online ADD Index, FK Drop and Online Column RENAME.  These operations are non-blocking and will continue to evolve in future DMRs.  You can learn the grainy details by following John Russell's blog.InnoDB data access via Memcached API ("NotOnlySQL") - Improved refresh of an earlier feature releaseSimilar to Cluster 7.2, MySQL 5.6 provides direct NotOnlySQL access to InnoDB data via the familiar Memcached API. This provides the ultimate in flexibility for developers who need fast, simple key/value access and complex query support commingled within their applications.Improved Transactional Performance, ScaleThe InnoDB Engineering team has once again under promised and over delivered in the area of improved performance and scale.  These improvements are also included in the aggregated Spring 2012 labs release:InnoDB CPU cache performance improvements for modern, multi-core/CPU systems show great promise with internal tests showing:    2x throughput improvement for read only activity 6x throughput improvement for SELECT range Read/Write benchmarks are in progress More details on the above are available here. You can download all of the above in an aggregated "InnoDB 2012 Spring Labs Release" binary from the MySQL Labs. You can also learn more about these improvements and about related fixes to mysys mutex and hash sort by checking out the InnoDB team blog.MySQL 5.6.5 is another installment in what we believe will be the best release of the MySQL database ever.  It also serves as a shining example of how the MySQL Engineering team at Oracle leads in MySQL innovation.You can get the overall Oracle message on the MySQL 5.6.5 DMR and Early Access labs features here. As always, thanks for your continued support of MySQL, the #1 open source database on the planet!

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  • problem with loading in .FBX meshes in DirectX 10

    - by N0xus
    I'm trying to load in meshes into DirectX 10. I've created a bunch of classes that handle it and allow me to call in a mesh with only a single line of code in my main game class. How ever, when I run the program this is what renders: In the debug output window the following errors keep appearing: D3D10: ERROR: ID3D10Device::DrawIndexed: Input Assembler - Vertex Shader linkage error: Signatures between stages are incompatible. The reason is that Semantic 'TEXCOORD' is defined for mismatched hardware registers between the output stage and input stage. [ EXECUTION ERROR #343: DEVICE_SHADER_LINKAGE_REGISTERINDEX ] D3D10: ERROR: ID3D10Device::DrawIndexed: Input Assembler - Vertex Shader linkage error: Signatures between stages are incompatible. The reason is that the input stage requires Semantic/Index (POSITION,0) as input, but it is not provided by the output stage. [ EXECUTION ERROR #342: DEVICE_SHADER_LINKAGE_SEMANTICNAME_NOT_FOUND ] The thing is, I've no idea how to fix this. The code I'm using does work and I've simply brought all of that code into a new project of mine. There are no build errors and this only appears when the game is running The .fx file is as follows: float4x4 matWorld; float4x4 matView; float4x4 matProjection; struct VS_INPUT { float4 Pos:POSITION; float2 TexCoord:TEXCOORD; }; struct PS_INPUT { float4 Pos:SV_POSITION; float2 TexCoord:TEXCOORD; }; Texture2D diffuseTexture; SamplerState diffuseSampler { Filter = MIN_MAG_MIP_POINT; AddressU = WRAP; AddressV = WRAP; }; // // Vertex Shader // PS_INPUT VS( VS_INPUT input ) { PS_INPUT output=(PS_INPUT)0; float4x4 viewProjection=mul(matView,matProjection); float4x4 worldViewProjection=mul(matWorld,viewProjection); output.Pos=mul(input.Pos,worldViewProjection); output.TexCoord=input.TexCoord; return output; } // // Pixel Shader // float4 PS(PS_INPUT input ) : SV_Target { return diffuseTexture.Sample(diffuseSampler,input.TexCoord); //return float4(1.0f,1.0f,1.0f,1.0f); } RasterizerState NoCulling { FILLMODE=SOLID; CULLMODE=NONE; }; technique10 Render { pass P0 { SetVertexShader( CompileShader( vs_4_0, VS() ) ); SetGeometryShader( NULL ); SetPixelShader( CompileShader( ps_4_0, PS() ) ); SetRasterizerState(NoCulling); } } In my game, the .fx file and model are called and set as follows: Loading in shader file //Set the shader flags - BMD DWORD dwShaderFlags = D3D10_SHADER_ENABLE_STRICTNESS; #if defined( DEBUG ) || defined( _DEBUG ) dwShaderFlags |= D3D10_SHADER_DEBUG; #endif ID3D10Blob * pErrorBuffer=NULL; if( FAILED( D3DX10CreateEffectFromFile( TEXT("TransformedTexture.fx" ), NULL, NULL, "fx_4_0", dwShaderFlags, 0, md3dDevice, NULL, NULL, &m_pEffect, &pErrorBuffer, NULL ) ) ) { char * pErrorStr = ( char* )pErrorBuffer->GetBufferPointer(); //If the creation of the Effect fails then a message box will be shown MessageBoxA( NULL, pErrorStr, "Error", MB_OK ); return false; } //Get the technique called Render from the effect, we need this for rendering later on m_pTechnique=m_pEffect->GetTechniqueByName("Render"); //Number of elements in the layout UINT numElements = TexturedLitVertex::layoutSize; //Get the Pass description, we need this to bind the vertex to the pipeline D3D10_PASS_DESC PassDesc; m_pTechnique->GetPassByIndex( 0 )->GetDesc( &PassDesc ); //Create Input layout to describe the incoming buffer to the input assembler if (FAILED(md3dDevice->CreateInputLayout( TexturedLitVertex::layout, numElements,PassDesc.pIAInputSignature, PassDesc.IAInputSignatureSize, &m_pVertexLayout ) ) ) { return false; } model loading: m_pTestRenderable=new CRenderable(); //m_pTestRenderable->create<TexturedVertex>(md3dDevice,8,6,vertices,indices); m_pModelLoader = new CModelLoader(); m_pTestRenderable = m_pModelLoader->loadModelFromFile( md3dDevice,"armoredrecon.fbx" ); m_pGameObjectTest = new CGameObject(); m_pGameObjectTest->setRenderable( m_pTestRenderable ); // Set primitive topology, how are we going to interpet the vertices in the vertex buffer md3dDevice->IASetPrimitiveTopology( D3D10_PRIMITIVE_TOPOLOGY_TRIANGLELIST ); if ( FAILED( D3DX10CreateShaderResourceViewFromFile( md3dDevice, TEXT( "armoredrecon_diff.png" ), NULL, NULL, &m_pTextureShaderResource, NULL ) ) ) { MessageBox( NULL, TEXT( "Can't load Texture" ), TEXT( "Error" ), MB_OK ); return false; } m_pDiffuseTextureVariable = m_pEffect->GetVariableByName( "diffuseTexture" )->AsShaderResource(); m_pDiffuseTextureVariable->SetResource( m_pTextureShaderResource ); Finally, the draw function code: //All drawing will occur between the clear and present m_pViewMatrixVariable->SetMatrix( ( float* )m_matView ); m_pWorldMatrixVariable->SetMatrix( ( float* )m_pGameObjectTest->getWorld() ); //Get the stride(size) of the a vertex, we need this to tell the pipeline the size of one vertex UINT stride = m_pTestRenderable->getStride(); //The offset from start of the buffer to where our vertices are located UINT offset = m_pTestRenderable->getOffset(); ID3D10Buffer * pVB=m_pTestRenderable->getVB(); //Bind the vertex buffer to input assembler stage - md3dDevice->IASetVertexBuffers( 0, 1, &pVB, &stride, &offset ); md3dDevice->IASetIndexBuffer( m_pTestRenderable->getIB(), DXGI_FORMAT_R32_UINT, 0 ); //Get the Description of the technique, we need this in order to loop through each pass in the technique D3D10_TECHNIQUE_DESC techDesc; m_pTechnique->GetDesc( &techDesc ); //Loop through the passes in the technique for( UINT p = 0; p < techDesc.Passes; ++p ) { //Get a pass at current index and apply it m_pTechnique->GetPassByIndex( p )->Apply( 0 ); //Draw call md3dDevice->DrawIndexed(m_pTestRenderable->getNumOfIndices(),0,0); //m_pD3D10Device->Draw(m_pTestRenderable->getNumOfVerts(),0); } Is there anything I've clearly done wrong or are missing? Spent 2 weeks trying to workout what on earth I've done wrong to no avail. Any insight a fresh pair eyes could give on this would be great.

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  • Java EE/GlassFish Adoption Story by Kerry Wilson/Vanderbilt University

    - by reza_rahman
    Kerry Wilson is a Software Engineer at the Vanderbilt University Medical Center. He served in a consultant role to design a lightweight systems integration solution for the next generation Foundations Recovery Network using GlassFish, Java EE 6, JPA, @Scheduled EJBs, CDI, JAX-RS and JSF. He shared his story at the JavaOne 2013 Sunday GlassFish community event - check out the video below: Kerry outlined some of the details of the implementation and emphasized the fact that Java EE can be a great solution for applications that are considered small/lightweight. He mentioned the productivity gains through the modern Java EE programming model centered on annotations, POJOs and zero-configuration - comparing it with competing frameworks that aim towards similar productivity for lightweight applications. Kerry also stressed the quality of the excellent NetBeans integration with GlassFish and the need for community self-support in free, non-commercial open source projects like GlassFish. You can check out the details of his story on the GlassFish stories blog. Do you have a Java EE/GlassFish adoption story to share? Let us know and we will highlight it for the community.

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  • Java EE/GlassFish Adoption Story by Kerry Wilson/Vanderbilt University

    - by reza_rahman
    Kerry Wilson is a Software Engineer at the Vanderbilt University Medical Center. He served in a consultant role to design a lightweight systems integration solution for the next generation Foundations Recovery Network using GlassFish, Java EE 6, JPA, @Scheduled EJBs, CDI, JAX-RS and JSF. He lives in Nashville, TN where he helps organize the Nashville Java User Group. Kerry shared his Java EE/GlassFish adoption story at the JavaOne 2013 Sunday GlassFish community event - check out the video below: Here is the slide deck for his talk: GlassFish Story by Kerry Wilson/Vanderbilt University Medical Center from glassfish Kerry outlined some of the details of the implementation and emphasized the fact that Java EE can be a great solution for applications that are considered small/lightweight. He mentioned the productivity gains through the modern Java EE programming model centered on annotations, POJOs and zero-configuration - comparing it with competing frameworks that aim towards similar productivity for lightweight applications. Kerry also stressed the quality of the excellent NetBeans integration with GlassFish and the need for community self-support in free, non-commercial open source projects like GlassFish.

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  • Price comparison sites and its effect on Google ranking

    - by Jivago
    I am the webmaster of a website that contains roughly 10,000 products. I would be possibly interested to index those products in a price comparison site like PriceGrabber, Nextag, Shopbot, etc. The principle of price comparison sites is great for an actual user that want to compare prices but my main concern is the effect it could have on my actual ranking on Google... Since a site like Shopbot uses a CPC model (Cost-per-click), all the links on the website are builted to track clicks (IE: http://www.shopbot.ca/r.html?i=3&catc=2&refshop=5706&refshopcodeid=42587349), it uses redirection, no direct links (So no direct backlinking). In your opinion and/or experience, is this a smart, business wise, seo wise move or not? THANKS!

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  • Database Machine gyakorlati tapasztalatok!

    - by Fekete Zoltán
    Ketto héttel ezelott gyakorlati tapasztalatokat szereztünk egy magyarországon muködo vállalat adattárházával egy igazi Database Machine / Exadata környezetben, egy Sun Oracle Database Machine Half Rack kiépítéssel. Az eredmények valóban lenyugözöek. Az Exadata Storage izgalmas és egyedi tulajdonságai: Smart Scan, Smart Flash Cache, Storage Index, tömörítés: Exadata Hybrid Columnar Compression, a hihetetlen mértéku párhuzamosság olyan teljesítmény elonyhöz juttatja a felhasználót, ami szemelkerekedést, ujjongást és hosszantartó belso mosolyt eredményez. Hogy ez hasznos-e az Ön és adatbázis környezete egészségére nézve? :) Kérdezze meg orvosát, gyógyszerészét és a white paper leírásokat, továbbá publikált ügyfél történeteket. A technikai és kereskedelmi részletekrol kérdezzen engem. :) A holnapi (2010. máricius 24. szerda) eloadáson a HOUG Konferencián személyesen is meghallgathatók ezek a gyakorlati tapasztalatok, authentikus forrásból. Hasonlóan szép napokat kívánok mindenkinek!

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  • Small projects using the cathedral model: does open-source lower security?

    - by Anto
    We know of Linus' law: With enough eyeballs all bugs are shallow In general, people seem to say that open-source software is more secure because of that very thing, but... There are many small OSS projects with just 1 or 2 developers (the cathedral model, as described by ESR). For these projects, does releasing the source-code actually lower the security? For projects like the Linux kernel there are thousands of developers and security vulnerabilities are quite likely going to be found, but when just some few people look through the source code, while allowing crackers (black hat hackers) to see the source as well, is the security lowered instead of increased? I know that the security advantage closed-source software has over OSS is security through obscurity, which isn't good (at all), but it could help to some degree, at least by giving those few devs some more time (security through obscurity doesn't help with the if but with the when). EDIT: The question isn't whether OSS is more secure than non-OSS software but if the advantages for crackers are greater than the advantages for the developers who want to prevent security vulnerabilities from being exploited.

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  • Do backlinks to blocked content add value?

    - by David Fisher
    We've been debating the following SEO question at our office: If you block bot access to a page either via robots.txt or on-page noindex metadata, does that negate the value of any backlinks to that page? We have a client who wants to block some event booking form pages from being indexed as each booking form page has a unique URL parameter and the pages are "clogging up" the Google index; however lots of websites link to those booking form pages and we wouldn't want to lose the value of those links. Any opinions welcomed.

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  • Subterranean IL: Constructor constraints

    - by Simon Cooper
    The constructor generic constraint is a slightly wierd one. The ECMA specification simply states that it: constrains [the type] to being a concrete reference type (i.e., not abstract) that has a public constructor taking no arguments (the default constructor), or to being a value type. There seems to be no reference within the spec to how you actually create an instance of a generic type with such a constraint. In non-generic methods, the normal way of creating an instance of a class is quite different to initializing an instance of a value type. For a reference type, you use newobj: newobj instance void IncrementableClass::.ctor() and for value types, you need to use initobj: .locals init ( valuetype IncrementableStruct s1 ) ldloca 0 initobj IncrementableStruct But, for a generic method, we need a consistent method that would work equally well for reference or value types. Activator.CreateInstance<T> To solve this problem the CLR designers could have chosen to create something similar to the constrained. prefix; if T is a value type, call initobj, and if it is a reference type, call newobj instance void !!0::.ctor(). However, this solution is much more heavyweight than constrained callvirt. The newobj call is encoded in the assembly using a simple reference to a row in a metadata table. This encoding is no longer valid for a call to !!0::.ctor(), as different constructor methods occupy different rows in the metadata tables. Furthermore, constructors aren't virtual, so we would have to somehow do a dynamic lookup to the correct method at runtime without using a MethodTable, something which is completely new to the CLR. Trying to do this in IL results in the following verification error: newobj instance void !!0::.ctor() [IL]: Error: Unable to resolve token. This is where Activator.CreateInstance<T> comes in. We can call this method to return us a new T, and make the whole issue Somebody Else's Problem. CreateInstance does all the dynamic method lookup for us, and returns us a new instance of the correct reference or value type (strangely enough, Activator.CreateInstance<T> does not itself have a .ctor constraint on its generic parameter): .method private static !!0 CreateInstance<.ctor T>() { call !!0 [mscorlib]System.Activator::CreateInstance<!!0>() ret } Going further: compiler enhancements Although this method works perfectly well for solving the problem, the C# compiler goes one step further. If you decompile the C# version of the CreateInstance method above: private static T CreateInstance() where T : new() { return new T(); } what you actually get is this (edited slightly for space & clarity): .method private static !!T CreateInstance<.ctor T>() { .locals init ( [0] !!T CS$0$0000, [1] !!T CS$0$0001 ) DetectValueType: ldloca.s 0 initobj !!T ldloc.0 box !!T brfalse.s CreateInstance CreateValueType: ldloca.s 1 initobj !!T ldloc.1 ret CreateInstance: call !!0 [mscorlib]System.Activator::CreateInstance<T>() ret } What on earth is going on here? Looking closer, it's actually quite a clever performance optimization around value types. So, lets dissect this code to see what it does. The CreateValueType and CreateInstance sections should be fairly self-explanatory; using initobj for value types, and Activator.CreateInstance for reference types. How does the DetectValueType section work? First, the stack transition for value types: ldloca.s 0 // &[!!T(uninitialized)] initobj !!T // ldloc.0 // !!T box !!T // O[!!T] brfalse.s // branch not taken When the brfalse.s is hit, the top stack entry is a non-null reference to a boxed !!T, so execution continues to to the CreateValueType section. What about when !!T is a reference type? Remember, the 'default' value of an object reference (type O) is zero, or null. ldloca.s 0 // &[!!T(null)] initobj !!T // ldloc.0 // null box !!T // null brfalse.s // branch taken Because box on a reference type is a no-op, the top of the stack at the brfalse.s is null, and so the branch to CreateInstance is taken. For reference types, Activator.CreateInstance is called which does the full dynamic lookup using reflection. For value types, a simple initobj is called, which is far faster, and also eliminates the unboxing that Activator.CreateInstance has to perform for value types. However, this is strictly a performance optimization; Activator.CreateInstance<T> works for value types as well as reference types. Next... That concludes the initial premise of the Subterranean IL series; to cover the details of generic methods and generic code in IL. I've got a few other ideas about where to go next; however, if anyone has any itching questions, suggestions, or things you've always wondered about IL, do let me know.

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  • Partial upgrade error

    - by Dan
    this is an issue I have googled a lot and I have tried a lot of fixes, but non of them really worked. At some point (I can't remember when/how) my Update system sort of broke, and since then it is always complaining about "Not all updates can be installed, run a Partial Upgrade". If I click on Partial Upgrade, I get the following result But running apt-get install -f does not fix anything, and at the end I always get the following message Funny thing is that my apt-get system works perfect on Console. I can update my system through apt-get update, apt-get upgrade etc.. So.. how can I fix the graphic interface? I understand that my apt-get system is not broken, but somehow its GUI it is. Any thoughts about it? THANKS! P.D: I have already tried sudo dpkg --configure -a and sudo apt-get autoremove

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  • Kill a tree, save your website? Content strategy in action, part III

    - by Roger Hart
    A lot has been written about how driving content strategy from within an organisation is hard. And that's true. Red Gate is pretty receptive to new ideas, so although I've not had a total walk in the park, it's been a hike with charming scenery. But I'm one of the lucky ones. Lots of people are involved in content, and depending on your organisation some of those people might be the kind who'll gleefully call themselves "stakeholders". People holding a stake generally want to stick it through something's heart and bury it at a crossroads. Winning them over is not always easy. (Richard Ingram has made a nice visual summary of how this can feel - Content strategy Snakes & ladders - pdf ) So yes, a lot of content strategy advocates are having a hard time. And sure, we've got a nice opportunity to get together and have a hug and a cry, but in the interim we could use a hand. What to do? My preferred approach is, I'll confess, brutal. I'd like nothing so much as to take a scorched earth approach to our website. Burn it, salt the ground, and build the new one right: focusing on clearly delineated business and user content goals, and instrumented so we can tell if we're doing it right. I'm never getting buy-in for that, but a boy can dream. So how about just getting buy-in for some small, tenable improvements? Easier, but still non-trivial. I sat down for a chat with our marketing and design guys. It seemed like a good place to start, even if they weren't up for my "Ctrl-A + Delete"  solution. We talked through some of this stuff, and we pretty much agreed that our content is a bit more broken than we'd ideally like. But to get everybody on board, the problems needed visibility. Doing a visual content inventory Print out the internet. Make a Wall Of Content. Seriously. If you've already done a content inventory, you know your architecture, and you know the scale of the problem. But it's quite likely that very few other people do. So make it big and visual. I'm going to carbon hell, but it seems to be working. This morning, I printed out a tiny, tiny part of our website: the non-support content pertaining to SQL Compare I made big, visual, A3 blowups of each page, and covered a wall with them. A page per web page, spread over something like 6M x 2M, with metrics, right in front of people. Even if nobody reads it (and they are doing) the sheer scale is shocking. 53 pages, all told. Some are redundant, some outdated, some trivial, a few fantastic, and frighteningly many that are great ideas delivered not-quite-right. You have to stand quite far away to get it all in your field of vision. For a lot of today, a whole bunch of folks have been gawping in amazement, talking each other through it, peering at the details, and generally getting excited about content. Developers, sales guys, our CEO, the marketing folks - they're engaged. Will it last? I make no promises. But this sort of wave of interest is vital to getting a content strategy project kicked off. While the content strategist is a saucer-eyed orphan in the cupboard under the stairs, they're not getting a whole lot done. Of course, just printing the site won't necessarily cut it. You have to know your content, and be able to talk about it. Ideally, you'll also have page view and time-on-page metrics. One of the most powerful things you can do is, when people are staring at your wall of content, ask them what they think half of it is for. Pretty soon, you've made a case for content strategy. We're also going to get folks to mark it up - cover it with notes and post-its, let us know how they feel about our content. I'll be blogging about how that goes, but it's exciting. Different business functions have different needs from content, so the more exposure the content gets, and the more feedback, the more you know about those needs. Fingers crossed for awesome.

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  • Name a Byobu session?

    - by Ashimema
    Is there a way to create identifiable Byobu sessions so that when I've got multiple sessions running, the byobu-select-session menu gives me a list of sessions I can recognize, as opposed to non-descript tmux port numbers? In an ideal world, it would be great to be able to both start a session giving it a name and to modify such a session to change a name if it's already running? Is this possible, how? Edit 1: Some further details: I'm using tmux as the backend and don't especially want to switch back to screen. I've now tried starting a session with byobu -S "Name" to no avail :-( Edit 2: Some discoveries: I've now discovered a partial answer in using tmux native commands: tmux rename-session <current-name> <new-name> renames an existing session and tmux new -s session_name creates a new names session. I'm surprised byobu -S "name" isn't liked to tmux new -s session_name for byobu with a tmux backend.

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  • How to install Sweetcron on XAMPP

    - by Sushaantu
    This tutorial will take you to the installation steps required to install Sweetcron in the XAMPP. I am taking the liberty to assume that you have already installed XAMPP. I First of all download sweetcron and copy the extracted “sweetcron” folder inside the htdocs folder in the XAMPP directory. You have to get few things in place before installing sweetcron: 1. Create a sweetcron database using Mysql. You can just put a name “sweetcron” and leave all the other settings such as Mysql connection collation as it is. Now that you have the database ready you can configure few settings before making sweetcron to work on XAMPP. 2. Open the config-sample PHP file with your text editor (something like Notepad++ or Komodo Edit is recommended) which is located in Sweetcron/system/application/config. You have to make few changes in it. a. In the first settings you have to edit the value of $config ['base_url']. The default value is             “http://www.your-site.com”; and you have to change that into “http://localhost/sweetcron/”; b. You also have to change the deafult settings of $config ['uri_protocol']. The value that you will see is “REQUEST_URI”; but you need to change that into “AUTO”; c. Now that we have made all the changes you can rename the file from config_sample to just config. 3. Open the database-sample.php in the text editor. You need to make the edits regarding the databse in here. a. The values of the databse at the moment are like this: $db['default']['hostname'] = “localhost”; $db['default']['username'] = “”; $db['default']['password'] = “”; $db['default']['database'] = “”; $db['default']['dbdriver'] = “mysql”; $db['default']['dbprefix'] = “”; $db['default']['pconnect'] = TRUE; $db['default']['db_debug'] = TRUE; $db['default']['cache_on'] = FALSE; $db['default']['cachedir'] = “”; $db['default']['char_set'] = “utf8″; $db['default']['dbcollat'] = “utf8_general_ci”; You have to change that into $db['default']['hostname'] = “localhost”; $db['default']['username'] = “root”; $db['default']['password'] = “”; $db['default']['database'] = “sweetcron”; $db['default']['dbdriver'] = “mysql”; $db['default']['dbprefix'] = “”; $db['default']['pconnect'] = TRUE; $db['default']['db_debug'] = TRUE; $db['default']['cache_on'] = FALSE; $db['default']['cachedir'] = “”; $db['default']['char_set'] = “utf8″; $db['default']['dbcollat'] = “utf8_general_ci”; We have written the username as root along with the name of database (sweetcron in my case). Since I was not using any password in xampp for the sweetcron database so I have left the password option empty. You can make suitable changes according to your system. Write down your password in the third line if you are using one in xampp. b. Now that we have made all the edits we can change the file name from database-sample to just database. 4. That leaves us with only one setting and that is editing values in the .htaccess file with our text editor. The default values you will have in the .htaccess file are: Options +FollowSymLinks RewriteEngine On RewriteBase / RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ index.php?/$1 [L] and you just have to add “sweetcron” after Rewritebase in the third line. Options +FollowSymLinks RewriteEngine On RewriteBase /sweetcron RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ index.php?/$1 [L] 5. Now you are all set and done. You can access sweetcron in the localhost by going to http://localhost/sweetcron/ you will see some text on the top which would prompt you to click on one script. Click that script and behold, you have your sweetcrom installation on xampp ready. Further it will ask you to add deatils such as Lifestream name, username and email address. Fill those deatils and you will reach the admin panel.

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  • 3 language website using subdomains and mapped domains. Add subdomains or mapped domains to WMT?

    - by Owen Mclaughlin
    I have a new wordpress multisite setup. Main language Italian and 2 subdomains using en and de for english and german. There is no auto translation plugins being used. The wordpress theme being used is by Studiopress.com and have SEO built in. I am a little confused as which domains to use in Webmasters Tools. If I use the subdomains (en and de) which have the seo setup, then google will index and show the en.example.it wont know about the mapped domains or display them. If I use the mapped domains then won't google not see the seo for the subdomains. I am muddled with this. What do??

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  • Does Google include the time to load images, for a single page, as part of the page speed?

    - by Pure.Krome
    we all know that Google's affects your page rank with the load time of a page. How? That's part of the secret sauce. But we know that page speed is a serious factor. So - what is considered the speed of a page? Is it just the first (and main) html file which the GET receives? Or does it also include loading of images as part of that speed. so for example... GET /index.htm <- takes 0.45 seconds to retrieve (including DNS lookup before). robot parses page.. see's there's a single main image.... GET /img/main.png <- takes 5 seconds to download. is the page speed for that resource, 0.45 seconds OR 5.45 seconds? I understand Javascript is not fired .. but are any of these external resources all downloaded and part of the page speed?

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