Open Stack

Sorry wrong list, meant for openstack-dev.

On 06/12/2014 01:05 PM, Tom Cammann wrote:
> Hello,
>
> I'm addressing https://bugs.launchpad.net/oslo/+bug/1326020 which is
> dealing with periodic tasks.
>
> There is currently a code block that checks if a task is 0.2 seconds
> away from being run and if so it run now instead. Essentially
> coalescing nearby tasks together.
>
> From oslo-incubator/openstack/common/periodic_task.py:162
>
> # If a periodic task is _nearly_ due, then we'll run it early
> idle_for = min(idle_for, spacing)
> if last_run is not None:
>     delta = last_run + spacing - time.time()
>     if delta > 0.2:
>         idle_for = min(idle_for, delta)
>         continue
>
> However the resolution in the config for various periodic tasks is by
> the second, and I have been unable to find a task that has a
> millisecond resolution. I intend to get rid of this coalescing in this
> bug fix.
>
> It fits in with this bug fix as I intend to make the tasks run on their
> specific spacing boundaries, i.e. if spacing is 10 seconds, it will run
> at 17:30:10, 17:30:20, etc.
>
> Is there any reason to keep the coalescing of tasks?
>
> Thanks,
>
> Tom
>
>
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