Wenlong Dong's Blog

Dustin Metzgar and Sajay Antony , our performance developers, have all started up their blogs on MSDN, which is great news to developers who are interested in WCF/WF/AppFabric performance or other fun things covered by their blogs. Dustin has just...

For quite a few times, I heard customers would hit this issue after installing .Net 3.5 patches or repair 3.5 on Windows Vista or Windows 2008 Server. Basically the machine.config file contains some invalid Xml content and applications using configuration...

We have just published the performance whitepaper for WF 4 at the following location: http://msdn.microsoft.com/en-us/library/gg281645.aspx We have done quite some component-level performance measurement for different activities and scenarios. Here...

This is not a new topic. But interestingly I could not find a good example on the web while I wanted to find one for some other investigation. So I decided to create a sample here to show the following scenario: · A WCF service has the access to a...

Customers reported the following WCF performance issue recently: · A WCF service over TCP or Named Pipe idles for over 15 seconds and the first request after that becomes very slow. Why? This can be easily reproduced. Basically, if you send two...

Customers reported the following WCF performance issue recently: · A WCF client sends 10 requests concurrently to a self-hosted WCF service on 10 different threads. The service operation is very simple and it simply sleeps for 1 second. But the latencies...

Recently I helped a customer with a few friends to debug a TimeoutException issue happened in their middle-tier which uses WCF proxies. The issue turned out to be simple but the experience was quite interesting and I would like to tell you how we proceeded...

It has been quite a while that I did not write anything. This is because I was fully focusing on WCF 4. Now that we have got most of the work done, it is good time to continue my writing. Starting from this blog entry, I will show you performance related...

WCF is a framework that is asynchronous inside out. Internally, asynchronous patterns are used to achieve non-blocking calls between different layers inside WCF. Externally WCF exposes the asynchronous patterns for both client and service programming...

This is not a new topic in the world of traditional web service usage. But I was still asked by people who use WCF. So I think it would be valuable to post a blog entry here. One of our customers asked me the following question: “We are using WCF in...

There are still 21 days to go until the PDC . Are you excited to attend those fascinating technical sessions ? You might have noticed that we have the following interesting sessions for WF/WCF as part of .NET Framework 4.0: · WF 4.0: A First Look ...

Lately I have been quite busy working on .NET 4.0 which will be the next major side-by-side release of .NET Framework since .NET 2.0. It will be unveiled at PDC on October 27th. .NET 4.0 will be shipped together with the next version of Visual Studio...

Introduction As mentioned in my last blog entry , for IIS-hosted WCF services, WCF holds the worker thread coming from ASP.NET until the whole request is completed to avoid a Denial of Service (DOS) attack. I also mentioned that on Windows 2008 Server...

Two Threads per Request In .NET 3.0 and 3.5, there is a special behavior that you would observe for IIS-hosted WCF services. Whenever a request comes in, the system would use two threads to process the request: · One thread is the CLR ThreadPool...

Here is some good news for people who are looking for WCF Security guidance. The Microsoft Patterns and Practices team has just created the following blog for this: http://blogs.msdn.com/jmeier/archive/2008/03/27/patterns-and-practices-wcf-security...

In .NET 3.0, you would handle two different timeouts: · Binding.SendTimeout This is the timeout that specifies how long the client can wait for the transport to complete data writing until throwing exception. It is client side setting. If the request...

There are tons of good articles and blogs out there regarding how to use Visual Studio Team System ( VSTS ) performance tools ( vsperfcmd.exe etc under "%ProgramFiles%\Microsoft Visual Studio 8\Team Tools\Performance Tools" if you have installed VSTS...

Kenny wrote an excellent blog entry to compare the three WCF encoders (Binary, MTOM, and Text) from performance perspective. It is quite helpful for you to decide when to use which encoder.

Introduction Ideally we should not need to pool WCF client proxies as I mentioned in my previous blog entry . From some customer feedback, however, I got to know that reusing proxies is not ideal because: · There may be some unknown contention cost...

In .NET 3.5, a new type WorkflowServiceHost is introduced to provide the integration of WF and WCF. On the server-side, ReceiveActivty plays the main role to implement WCF service operations. With this, you can have WCF clients to talk to WF services...

Do you want to work on Microsoft's next generation of the distributed application framework? Do you enjoy the thrill of shipping a great product? Do you want to join the team that has shipped WCF + WF in .NET 3.0? Are you up to the challenge of improving...

Introduction In .NET 3.0 SP1, which will be shipped together with .NET 3.5, there is significant performance improvement in WCF client proxy creation. For BasicHttpBinding, the performance is close to that of ASMX proxy creation. ASMX Proxy vs WCF...

In order to provide symmetric programming model for the client-side as for the server-side, WCF leverages .NET Remoting transparent proxy technique so that the service contract interface can be used seamlessly as on the server-side. The svcutil.exe tool...

Sometimes you want to redirect users request to a different one when you want to retire old ones but still provide backward-compatibility. David Wang has a good summary on different redirects for IIS in his blog entry . Here I just want to add a few points...

For backward compatibility, WCF supports easy server-side migration from ASMX to WCF. This is good news for existing ASMX customers. Generally, the clients of ASMX may have server Urls hard-coded with the extension “.asmx”. For example, here is a sample...