I'm hunting for some memory-leaks in a long runing service (using F#) right now. The only "strange" thing I've seen so far is the following:

  • I use a MailboxProcessor in a subsystem with an algebraic-datatype named QueueChannelCommands (more or less a bunch of Add/Get commands - some with AsyncReplyChannels attached)
  • when I profile the service (using Ants Memory Profiler) I see instances of arrays of mentioned type (most having lenght 4, but growing) - all empty (null) whose references seems to be held by Control.Mailbox: enter image description here

I cannot see any reason in my code for this behaviour (your standard code you can find in every Mailbox-example out there - just a loop with a let! = receive and a match to follow ended with a return! loop()

Has anyone seen this kind of behaviour before or even knows how to handle this? Or is this even a (known) bug?

Update: the growing of the arrays is really strange - seems like there is additional space appended without beeing used properly: enter image description here

memory-leaks f# mailboxprocessor
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