# Sunday, 26 July 2009

Wenlong Dong has just posted about changes to the WCF thottling defaults in WCF  4.0. The new throttle defaults are going to be based on the number of processors/cores in the machine – this means the more powerful the machine the higher the throttle will be  - which is a good thing. The throttle that always hit people first were either session, if they had a session as a result of contract/binding settings or, no session, concurrent calls. Now the changes (100 * processor count for session and 16 * processor count for calls) will mean that either one would bite first.

As Wenlong says, the original values were always too low for enterprise applications. What they did do, however, is force people to address throttling if they were writing enterprise apps. And Wenlong is right that that sometimes meant people putting the throttles up to int.MaxValue which is really the same as no throttle at all. But although, in general, I think the change is the right move (it mostly works out of the box), it will lead to people facing performance problems with absolutely no idea why they might be taking place.

What I mean by this is problems caused by the current throttles are really easy to spot “as soon as I put more than 10 calls though it breaks”. You can google that and find the problem and the solution. The new values make it hugely non-obvious why an application suddenly has problems with more than 400 clients (NetTcpBinding on machine with 4 cores for example). Good time to be a consultant in the UK and Europe I guess ;-)

.NET | WCF
Sunday, 26 July 2009 22:24:17 (GMT Daylight Time, UTC+01:00)  #    Disclaimer  |   | 
# Tuesday, 14 July 2009

It has been one of the bug bears for me as I have given talks on the Azure platform that I have not been able to answer any question that involved commercial details with anything other than “we’ll have to see the prices when they announce them. Finally, today, the team have announced the pricing model and availability

http://blogs.msdn.com/windowsazure/archive/2009/07/14/confirming-commercial-availability-and-announcing-business-model.aspx

.NET | Azure
Tuesday, 14 July 2009 15:46:36 (GMT Daylight Time, UTC+01:00)  #    Disclaimer  |   | 
# Saturday, 04 July 2009

One of the frustrations with the current WCF tooling is that, although I can generate the client proxy code from a WSDL document I cannot generate the server side skeleton that matches the WSDL. In situations where two parties agree a contract based on WSDL this makes implementing the service side error prone. Back in the ASMX days WSDL.EXE had a /s switch that would create the service side skeleton, but this feature was not carried through into SVCUTIL.EXE.

Fortunately the WSCF (Web Service Contract First) guys  have finally released a beta of a WCF compatible version of their tool that allows you to build up a model of the service and then generate the client and/or service

Here’s Santosh’s announcement

.NET | WCF
Saturday, 04 July 2009 10:03:55 (GMT Daylight Time, UTC+01:00)  #    Disclaimer  |   | 
# Thursday, 02 July 2009

In my last post I linked to the screencast I made on processing large messages in WCF using buffering. I also said that I would be putting up another one on streaming messages shortly. That second screencast has now gone live on the Rock Solid Knowledge website. In part 2 of the large message handling screencast I talk about enabling streaming, designing contracts for streaming and how this affects the way the receiver has to process the data. You can find the new screencast here

http://rocksolidknowledge.com/ScreenCasts.mvc

.NET | WCF
Thursday, 02 July 2009 13:02:39 (GMT Daylight Time, UTC+01:00)  #    Disclaimer  |   |