Jim, Good summary!
Where did you get the size limits for each generation? I had asked for this information to Microsoft folks via .NET authors connection some time ago but could not get an answer :-(. Pradeep http://www.tapadiya.net/pradeep ----- Original Message ----- From: "Murphy, James" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, May 01, 2002 12:45 PM Subject: Re: [DOTNET] How often does Garbage Collection run? > I suspect you knew it wasn't that simple a question... > > the GC collects parts of the managed heap at different frequencies. The > heap is partitioned into 3 sections called generations. The idea is that > collecting a generation is a lot cheaper than collecting the entire heap. > > An object lives in one of the generations depending on its "age". The > youngest objects are on generation 0, older ones in generation 1 and the > oldest in generation 2. Age is the number of collections that have occurred > during this objects lifetime. > > This algorithm (the ephemeral garbage collector) performs well for the > typical application. Its based on the assumption that the newer an object > is the shorter it lifetime will be. Conversely the older an object is the > longer its lifetime. When an object is newly created it is placed in > generation 0. If the collector runs and the object is still in use it is > promoted to generation 1. > > A collection is usually kicked off automatically when each generation hits a > threshold limit. Generation 0 is collected much more frequently than > generation 1 which is collected much more frequently than generation 2. > This is because the heap size triggers of the generations: > > Typically at AppDomain startup they at: > > Generation 0: 256 KB > Generation 1: 2 MB > Generation 2: 10 MB > > These are tuned at runtime to maximize performance. > > The GC also runs when you call GC.Collect(int generation) but doing so > usually screws with he GC algorithm. > > A final collection will also run when the AppDomain unloads. > > Jim > > > -----Original Message----- > > From: Farhan [mailto:[EMAIL PROTECTED]] > > Sent: Wednesday, May 01, 2002 3:32 PM > > To: [EMAIL PROTECTED] > > Subject: [DOTNET] How often does Garbage Collection run? > > > > > > How often does garbage collection run? what condition needs > > to be true in > > order for it to run? is there any way to tell when the > > Garbage collection > > will run? > > > > Thanks, > > Farhan > > > > You can read messages from the DOTNET archive, unsubscribe > > from DOTNET, or > > subscribe to other DevelopMentor lists at http://discuss.develop.com. > > > > You can read messages from the DOTNET archive, unsubscribe from DOTNET, or > subscribe to other DevelopMentor lists at http://discuss.develop.com. > You can read messages from the DOTNET archive, unsubscribe from DOTNET, or subscribe to other DevelopMentor lists at http://discuss.develop.com.
