[erlang-questions] System limit for erlang process and Pid
Sun Oct 16 19:09:39 CEST 2016
ARUN P writes:
> Am a newbie in erlang programming world and I seriously need some
> assistance. I am running an application in which am using
> *timer:apply_interval(1000, ?MODULE, monitor_loop , )*, as per my
> analysis found that this function call creates new processes at every
> 1000 millisecond interval. Since my *monitor loop* function only takes
> around 800 ms to complete its duty and then it dies, the number of
> processes are not getting increased. But as per my observation every
> time am getting a new PID and the PID number is always increasing and I
> came to know that the pid is limited by, 1 word for a process identifier
> from the current local node + 5 words for a process identifier from
> another node.
> So what will happen if my application continuous to run for months
> without stopping, will it crash the entire erlang vm.
No. The VM is quite capable of running for _years_.
I assume the local pids will wrap around and unused ones be reused, but
I haven't checked this.
> How the garbage
> collection will be happening for the dead process since for every
> process some amount of heap memory is getting allocated.
The memory allocated to an Erlang process, including its heap and stack,
is deallocated (not GC:d, more like free()) when that process terminates.
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