[systemd-devel] Question about OnUnitInactiveSec= directive

[Mikhail Kasimov]

Seems, AccuracySec=1us parameter resolves this problem indeed:
=====
Июл 09 10:55:30 linux-mk500 systemd[1]: Started VBA32 Anti-Virus Update 
Service.
Июл 09 11:00:30 linux-mk500 systemd[1]: Starting VBA32 Anti-Virus Update 
Service...

Июл 09 11:00:32 linux-mk500 systemd[1]: Started VBA32 Anti-Virus Update 
Service.
Июл 09 11:05:32 linux-mk500 systemd[1]: Starting VBA32 Anti-Virus Update 
Service...

Июл 09 11:05:35 linux-mk500 systemd[1]: Started VBA32 Anti-Virus Update 
Service.
Июл 09 11:10:35 linux-mk500 systemd[1]: Starting VBA32 Anti-Virus Update 
Service...
=====

Haven't read about AccuracySec parameter in man-page carefully. :(

Resolved. Thank you again!

09.07.2016 08:23, Andrei Borzenkov пишет:
> 09.07.2016 01:37, Mikhail Kasimov пишет:
>> Hello!
>>
>> Have a .timer service like:
>>
>> ======
>>
>> [Unit]
>> Description=Runs VBA32 Update Hourly
>> Requires=timers.target
>>
>> [Timer]
>> OnBootSec=2min
>> OnUnitInactiveSec=1h
>>
>> [Install]
>> WantedBy=timers.target
>>
>> ======
>>
>> to run vba32update.service in 1 hour after previous update-session is
>> over (OnUnitInactiveSec=1h).
>>
>>  From man-page: "|OnUnitInactiveSec=| defines a timer relative to when
>> the unit the timer is activating was last deactivated."
>>
>> Ok, here is log-snippet:
>> ======
>> Июл 08 22:05:00 linux-mk500 systemd[1]: Starting VBA32 Anti-Virus Update
>> Service...
>> Июл 08 22:05:00 linux-mk500 vbacl[14768]: Vba32 console scanner update
>> process started
>> Июл 08 22:05:00 linux-mk500 vbacl[14768]: Reading configuration options
>> from ./vbacl.ini
>> Июл 08 22:05:00 linux-mk500 vbacl[14768]: Using direct connection for
>> update
>> Июл 08 22:05:02 linux-mk500 vbacl[14768]: Current dir is ./
>> Июл 08 22:05:02 linux-mk500 vbacl[14768]: Start update from
>> http://anti-virus.by/update
>> Июл 08 22:05:02 linux-mk500 vbacl[14768]: Receiving file list
>> Июл 08 22:05:02 linux-mk500 vbacl[14768]: File list received
>> Июл 08 22:05:02 linux-mk500 vbacl[14768]: Update is not needed
>> Июл 08 22:05:02 linux-mk500 systemd[1]: Started VBA32 Anti-Virus Update
>> Service.
>>
> ...
>
>> We see 22:05:02 (end of update-session) --> 23:05:13 (start of next
>> update-session) --> 23:05:17 (end of update-session) --> 00:05:20 (start
>> of next update-session) --> 00:05:24 (end of update-session) -->
>> 01:05:50 (start of next update-session) --> 01:05:55 (end of
>> update-session).
>>
>> Question: Why time of new update-session is *not* equal to time of end
>> of previous update-session + 1h in section of seconds, e.g. 23:05:17 +1h
>> = 00:05:17; 00:05:24 + 1h = 01:05:24 and so on? Is here a way to reach
>> this precise coincidence?
>>
> Please check with "systemctl status" or "systemctl show" when unit was
> actually deactivated. Also see "AccuracySec" timer parameter.
>
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