[erlang-questions] [clarify] Limits and overhead of monitors
Mon Jun 9 16:01:57 CEST 2008
Jay Nelson <> writes:
> Has anyone determined the answer to any of the following questions:
> 1) Is a practical limit to the number of monitors a single process
> can hold?
There is no theoretical limit. The practical limit probably depends
on the application and the amount of memory in the computer.
> - I assume they are fairly static, so just the memory to store
> - how are they stored?
The endpoints for each monitor are stored in AVL trees. A monitor requires
about 10 words at each endpoint.
> - any problems if I have 100K processes in an everyone
> monitoring everyone configuration?
If one process dies, 100,000 processes will each get one DOWN message
and become runnable. It could take some time for the system run all those
> 2) How much overhead difference is there between a local monitor and
> remote node process monitor?
> - The pinging between nodes shouldn't need to propagate, just
> the failure to ping a node
Björn Gustavsson, Erlang/OTP, Ericsson AB
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