[erlang-questions] count events within last XX minutes

Anders Nygren <>
Fri Aug 24 17:14:51 CEST 2012

Use an ETS table with {Counter,{YYYY,MM,DD,HH,MM}} as key, and
update_counter returns the new counter value, so if it is 1, (or the
increment used) You know that a new minute has been entered so You can
delete the oldest.


On Fri, Aug 24, 2012 at 9:16 AM, Max Bourinov <> wrote:
> Dear Erlangers,
> Does anybody know best memory efficient way to count events within last XX
> minutes?
> So far I have the following idea: For each counter I have a process. The
> counter process has a list of XX items. Each item represents a certain
> minute, so I always know where is my current counter. There is also must be
> a mechanism to remove last item from the list and add a new one. Summing
> values from all items is a number of events within last XX minutes. This is
> it.
> Maybe there is a ready lib that does the same in a better way?
> Any suggestions are welcome!
> Best regards,
> Max
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