[Twisted-Python] scheduling timers with long interval
I have a server that is running for weeks without restart, under significant load. I am considering adding a function to it that requires setting long timers like twisted.internet.reactor.callLater(604800, func) i.e. scheduling events one week ahead. There will be up to 500 timers active at any given time. I do not know how the scheduler works. Will having these timers with very long intervals significantly tax the performance, since the reactor will have to check on their status with every churn of the reactor loop? Thanks Alec
On Fri, 17 Aug 2007 16:25:19 -0700 (PDT), Alec Matusis <matusis@yahoo.com> wrote:
I have a server that is running for weeks without restart, under significant load. I am considering adding a function to it that requires setting long timers like
twisted.internet.reactor.callLater(604800, func)
i.e. scheduling events one week ahead. There will be up to 500 timers active at any given time.
I do not know how the scheduler works. Will having these timers with very long intervals significantly tax the performance, since the reactor will have to check on their status with every churn of the reactor loop?
There is a minor memory cost associated with each task. Beyond that, there is a roughly log(N) insertion cost for new DelayedCalls, where N is the number of existing outstanding calls. The scheduling itself is basically constant time. None of the reactors should even notice if you have just 500 outstanding DelayedCalls. Jean-Paul
participants (2)
-
Alec Matusis -
Jean-Paul Calderone