[Koha-bugs] [Bug 22417] Add a task queue

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=22417

--- Comment #320 from Jonathan Druart <jonathan.druart at bugs.koha-community.org> ---
(In reply to Marcel de Rooy from comment #274)
> Completely other observation: Just noticing on my test server that process
> beam.smp used quite a bit CPU at some point while there was nothing going on
> in terms of background processes. Googling beam.smp brings you right to such
> things. Reason for being more cautious?


Same report on IRC with a possible solution:
< kohaputti> seems to be around 4-10% on my machine more or less constantly
< kohaputti> yes, it is beam.smp
< kohaputti> maybe there is some configration we could change
< kohaputti> (4-10% on one core)
< kohaputti> just installed the rabbitmq stuff because I noticed reset_all
needed it
< kohaputti> I have the latest version of Koha master as of ~1 hour
< kohaputti> lots of sched_yield() syscalls
< kohaputti> when I look with strace
< kohaputti> https://www.rabbitmq.com/runtime.html#cpu-reduce-idle-usage
< kohaputti> adding RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS="+sbwt none" to the env
vars seemed to do the trick
< kohaputti> now the load is around 1-2% constantly
< Joubu> which version of rabbitmq? which os?
< kohaputti> seems to be debian 9 (from koha-testing-docker)
< kohaputti> version of rabbitmq-server is 3.6.6-1


Under D11 (koha-testing-docker), RabbitMQ version: 3.8.9

* Without the config modification I see it around 4.5%
rabbitmq  1148  4.5  0.5 3227132 86044 ?       Sl   13:10   0:37
/usr/lib/erlang/erts-11.1/bin/beam.smp -W w -K true -A 64 -MBas ageffcbf -MHas
ageffcbf -MBlmbcs 512 -MHlmbcs 512 -MMmcs 30 -P 1048576 -t 5000000 -stbt db
-zdbbl 128000 -B i -- -root /usr/lib/erlang -progname erl -- -home
/var/lib/rabbitmq -- -pa  -noshell -noinput -s rabbit boot -boot start_sasl
-lager crash_log false -lager handlers []

* With the config modification:
% echo 'RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS="+sbwt none +sbwtdcpu none +sbwtdio
none"' >> /etc/rabbitmq/rabbitmq-env.conf
% service rabbitmq-server restart

It's around 3%
rabbitmq  2646  2.9  0.5 3223728 84124 ?       Sl   13:25   0:06
/usr/lib/erlang/erts-11.1/bin/beam.smp -W w -K true -A 64 -MBas ageffcbf -MHas
ageffcbf -MBlmbcs 512 -MHlmbcs 512 -MMmcs 30 -P 1048576 -t 5000000 -stbt db
-zdbbl 128000 -sbwt none -sbwtdcpu none -sbwtdio none -B i -- -root
/usr/lib/erlang -progname erl -- -home /var/lib/rabbitmq -- -pa  -noshell
-noinput -s rabbit boot -boot start_sasl -lager crash_log false -lager handlers
[]

Not changed much in my case.

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