I'm finding myself in dire need of monitoring the Haskell runtime. More precisely, I would like to know what each that I launch is doing at a given point in time. Is there a way to obtain this information now? I would be fine with knowing if a thread is blocking on a foreign call, MVar or something like that. The question is prompted by my current project and the issues I'm facing now. I believe I minimized the amount of garbage that I'm generating by moving to unboxed arrays from lists (thanks dcoutts) but I still have memory utilization issues. I currently have each thread associated with a TChan and I'm going to try to abstract that today by creating a special type of a thread object that is associated with two mailboxes (in and out). When starting this thread you would supply the event loop to read from the inbox and another one to write to the mailbox. I would also add stats to the TChan mailboxes so that I know the number of messages pending in each mailbox and can monitor it. This mirrors my current architecture where I have each poker bot as three threads: #1 reading messages from a socket and posting to #3, #2 reading messages sent by #3 and writing to the socket, #3 reading messages sent by #1, processing them and posting to #2. I suppose I'm trying to implement Erlang-like processes where each process has a mailbox for incoming messages and can send messages to any other process. In Erlang you can also check how many messages are pending to each process, etc. I don't think implementing message passing on top of exceptions is a good idea but please correct me if I'm wrong. In Erlang you are tasked with implementing the message loop yourself and retrieve messages by using a "receive" construct where you can pattern-match on the type of message inside. It seems that custom messages would need to be implemented on top of Dynamic but is there a way to pattern-match on that? I have messages implemented like this now but is there a better abstraction? data Event = Enter | Exit | Quit | Timeout String | Connected | Disconnected | Error String | Cmd Command | Custom Dynamic -- can't pattern-match on this? deriving Show Last but not least, to be able to send messages to any thread I would need to keep those around in some sort of a table. I would need to create records and keep the thread id, the mailbox and possibly some sort of a per-thread string so that threads can update me on their doings. Do you have any suggestions? Thanks, Joel -- http://wagerlabs.com/