Public bug reported:
When runner qrunner with --runners=All it calls all defined runners in an endless loop. Most of the time the runners have nothing to do and quickly reach the point where they shut down again. Note that this happens before they sleep in self._snooze(), which is intended to prevent a busy-loop. After that, the runners get started again without delay, in an endless loop, eating up a CPU core.
As far as I know this should happen in any mailman2.1 setup when using qrunner with --runners=All.
** Affects: mailman Importance: Undecided Status: New
a fix was suggested in https://code.launchpad.net/~mluto/mailman/qrunnersleep/+merge/363767
** Branch linked: lp:mailman/2.1
** Changed in: mailman Importance: Undecided => Medium
** Changed in: mailman Status: New => Fix Committed
** Changed in: mailman Milestone: None => 2.1.30
** Changed in: mailman Assignee: (unassigned) => Mark Sapiro (msapiro)
** Branch linked: lp:~mluto/mailman/qrunnersleep
** Changed in: mailman Status: Fix Committed => Fix Released