Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. An application can start up more quickly if initialization sequences such as initializing connections, priming in-memory caches, running queries, and compiling page code are performed before the HTTP request is received.
Application Initialization can start the initialization process automatically whenever an application is started. The application initialization does not necessarily make the initialization process run any faster; it starts the process sooner. Application initialization also enables you to enhance the user experience during initialization by redirecting a request to static pages, such as a placeholder or splash screen.
Once the site is loaded, it will stop mapping the managed request to the static page, and will start serving the dynamic content. However, application initialization can be used in conjunction with the out-of-band IIS Url Rewrite module to support more complex handling of placeholder content, including complex mappings to pre-generated static content.
The following code pattern and variations of it is extremely common. The original NT programming guidelines require all variables to be declared at the top of the function and for initialization to be deferred as late as possible.
The result is that we end up with cases where a variable is declared at the top of a function and only initialized in a single branch prior to being used. When we enable InitAll, there is a second initialization at the top of the function for the variable. While this looks like a simple example to optimize, GCC 9.
I say it to highlight that even powerful compilers can have trouble optimizing some of these coding patterns. Visual Studio was unable to eliminate it prior to the InitAll optimization work. In this example, two memsets are separated only by a function call that takes no arguments.
Once again, this sort of programming pattern is exceedingly common in Microsoft code. Once again, MSVC can optimize the unnecessary memset away. Clang While the test case looks easy to optimize, it requires the compiler to do non-trivial analysis. The gist of the issue here in MSVC was that the compiler has lexical escape analysis, it is not path or flow sensitive.
The MSVC compiler can now figure this out to varying degrees which allows it to optimize away the first call to memset. The following coding pattern is also somewhat common. A structure is partially initialized before being passed to another function. MSVC is now able to trim down the first memset to only set the parts of the structure that are not also set by the second memset.
Once again, GCC 9. In the following example, the call to memset cannot be optimized away. The program needs to execute memset as efficiently as possible.
This means the call to memset is replaced with a series of store instructions that directly set the memory. For small memsets under bytes , this is typically executes in one quarter of the time and often results in smaller code as well no need to save registers to the stack, call memset, and restore registers. By changing MSVC to use vector registers we were able to double the maximum size of a memset we can unroll and reduce overall binary size.
This results in faster memsets and less binary bloat. This means we no longer need to ship a security update for the in-market operating systems that have the mitigation installed, saving customers patching pain and Microsoft servicing pain.
Once this occurs, uninitialized memory bugs that are mitigated by InitAll will only need to be fixed in active development branches and this bug class will no longer need to be serviced to in-market operating systems. We currently have two primary areas that we plan to invest in going forward related to uninitialized stack variables:. Leaving variables uninitialized is not typically necessary for performance especially when the compiler has good redundant store elimination.
This could allow developers to keep performance while also saving themselves from unnecessary mistakes. We also plan to post an additional blog post on the work we are currently doing to mitigate uninitialized memory issues in the Windows kernel pool allocator.
There are really two distinct classes of vulnerabilities here: Uninitialized Memory Disclosure — Uninitialized memory is copied across a trust boundary and its contents are disclosed to a less privileged entity. The BitmapImage u r referring to is in "System.
You can refer to this link for all the properties available in WinRT msdn. Tohid Tohid 5, 7 7 gold badges 48 48 silver badges 76 76 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Making Agile work for data science. Stack Gives Back Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually.
Visit chat. To update the Microsoft. NET framework navigate to. NET Framework 4. NET Framework Runtime and install it. We can change the virtual memory and check if that resolves the issue. To Increase the virtual memory follow the steps mentioned below:. This will open Run. In Run dialog box, type sysdm. Click on Advanced tab. Under Performance click on Settings. Go to Advanced tab, and click on Change. Now uncheck the box automatically manage paging file size for all drives.
Under Drive column, click the required drive that has the paging file you want to alter. Click on the Custom size radio button. Now in the initial size box copy the recommended.
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