Microsoft UCMA：字符串未被垃圾收集

Question

我在我的 UCMA 应用程序上运行一个内存分析器，它作为一个将记录器参与者添加到会话的客户端，我注意到很多字符串实例占用了内存（即使参与者被移除并且在一段时间不活动后我注意到这些字符串不会被垃圾收集）：

Microsoft.Rtc.Collaboration!Microsoft.Rtc.Signaling.DiagnosticsInformation..ctor( int,DiagnosticVisibility )
Microsoft.Rtc.Collaboration!Microsoft.Rtc.Signaling.DiagnosticsInformation.CreateOutgoingDiagnosticsInformation( uint )
Microsoft.Rtc.Collaboration!Microsoft.Rtc.Collaboration.Call.SignalingSession_StateChanged( object,SignalingStateChangedEventArgs )
Microsoft.Rtc.Collaboration!Microsoft.Rtc.Signaling.EventWorkitem<TEventArgs>.Process()
Microsoft.Rtc.Collaboration!Microsoft.Rtc.Signaling.WorkitemQueue.ProcessItems()
Microsoft.Rtc.Collaboration!Microsoft.Rtc.Signaling.SerializationQueue<T>.ResumeProcessing()
Microsoft.Rtc.Collaboration!Microsoft.Rtc.Signaling.SerializationQueue<T>.ResumeProcessingCallback( object )
Microsoft.Rtc.Collaboration!Microsoft.Rtc.Signaling.QueueWorkItemState.ExecuteWrappedMethod( WaitCallback,object )
mscorlib!System.Threading.ExecutionContext.Run( ExecutionContext,ContextCallback,object )
mscorlib!System.Threading._ThreadPoolWaitCallback.PerformWaitCallbackInternal( _ThreadPoolWaitCallback )
mscorlib!System.Threading._ThreadPoolWaitCallback.PerformWaitCallback( object )

我看到大约 2000 个这样的实例，但它们没有被清理。有没有人见过这个并知道原因可能是什么，或者这是否是框架本身的 UCMA 问题？

编辑：我还看到框架上有很多反序列化（XML 反序列化器对象没有被清理？）

System.Xml!System.Xml.Serialization.XmlSerializer.Deserialize( XmlReader,string,XmlDeserializationEvents )
System.Xml!System.Xml.Serialization.XmlSerializer.Deserialize( XmlReader,string )
Microsoft.Rtc.Collaboration!Microsoft.Rtc.Signaling.XmlHelper.DeserializeObjectFragment( byte[],XmlSerializer )
Microsoft.Rtc.Collaboration!Microsoft.Rtc.Collaboration.Conferencing.ConferenceJoinCommandResponse.TryProcessResponseCore( SipMessageData,ref RealTimeException )
Microsoft.Rtc.Collaboration!Microsoft.Rtc.Collaboration.Conferencing.EstablishFocusSessionsAsyncResult.ParticipateCallback( IAsyncResult )
Microsoft.Rtc.Collaboration!Microsoft.Rtc.Signaling.CompletionCallbackWorkItem.Microsoft.Rtc.Signaling.IWorkitem.Process()
Microsoft.Rtc.Collaboration!Microsoft.Rtc.Signaling.WorkitemQueue.ProcessItems()
Microsoft.Rtc.Collaboration!Microsoft.Rtc.Signaling.SerializationQueue<T>.ResumeProcessing()
Microsoft.Rtc.Collaboration!Microsoft.Rtc.Signaling.SerializationQueue<T>.ResumeProcessingCallback( object )
Microsoft.Rtc.Collaboration!Microsoft.Rtc.Signaling.QueueWorkItemState.ExecuteWrappedMethod( WaitCallback,object )
mscorlib!System.Threading.ExecutionContext.Run( ExecutionContext,ContextCallback,object )
mscorlib!System.Threading._ThreadPoolWaitCallback.PerformWaitCallbackInternal( _ThreadPoolWaitCallback )
mscorlib!System.Threading._ThreadPoolWaitCallback.PerformWaitCallback( object )

Answer 1

垃圾回收不是由some time of inactivity 触发的。在内存中看到大量字符串或任何其他类的实例并没有错。并且永远不会收集实习字符串（编译时常量）。

在出现 Out-Of-Memory 异常之前不会发生内存泄漏。