Thank you very much Nick for the reply.
Most appreciated.
1) I checked _active_tasks and it return empty array []
2) About +sbwt, we are running on physical hardware ... no container.
+sbwt none
+S ${SCHEDULERS}
Would the above config changes you suggested earlier have any adverse
effect?
3) In my config file, there is
# Set maximum SSL session lifetime to reap terminated replication readers
-ssl session_lifetime 300
Note that I am using HAProxy for SSL.
Could this have any adverse effect?
Thank you very much.
Alfred.
On Thu, Sep 1, 2022 at 6:02 AM Nick Vatamaniuc <[email protected]> wrote:
> Hi Alfred,
>
> It could be you're seeing the effect of busy waiting from Erlang VM
> schedulers. Erlang VM would spawn a scheduler for each CPU core, and
> then after any of those schedulers run out of work, they would still
> spin in a busy loop for a bit waiting for more work. Sometimes that is
> not desirable, especially in containerized environments so then it's
> recommended to disable busy waiting by setting +sbwt to none in the
> vm.args file. Give that a try and see if it helps. More info about it
> can be found at https://adoptingerlang.org/docs/production/kubernetes/
>
> Another reason could be that there are some background index building
> or compaction jobs running.. Check out the output of _active_tasks to
> see if that's the case.
>
> Cheers,
> -Nick
>
> On Sun, Aug 14, 2022 at 11:38 AM Al Z. <[email protected]> wrote:
> >
> > Hello.
> > I have the latest CouchDB 3.2.2 on Ubuntu 22.04
> >
> > Even when there are no active clients talking to couchdb, the CPU is
> always
> > above 15%.
> > Not sure why.
> > couchdb's beam.smp is currently the busiest process on the server.
> >
> > [image: image.png]
> >
> >
> > # ps aux | grep couchdb
> > couchdb 979 13.4 0.1 4647432 100284 ? Ssl 15:03 2:10
> > /opt/couchdb/bin/../erts-12.2.1/bin/beam.smp -K true -A 16 -Bd -- -root
> > /opt/couchdb/bin/.. -progname couchdb -- -home /opt/couchdb -- -boot
> > /opt/couchdb/bin/../releases/3.2.2/couchdb -name couchdb@localhost
> > -setcookie SOME_SECRET_COOKIE -kernel inet_dist_use_interface {127,0,0,1}
> > -kernel error_logger silent -sasl sasl_error_logger false -noshell
> -noinput
> > -smp enable -ssl session_lifetime 300 -- -config
> > /opt/couchdb/bin/../releases/3.2.2/sys.config --
> > couchdb 1111 0.0 0.0 7136 220 ? S 15:03 0:00
> > /opt/couchdb/bin/../erts-12.2.1/bin/epmd -daemon
> > couchdb 1163 0.0 0.0 2780 972 ? Ss 15:03 0:00
> > erl_child_setup 65536
> > couchdb 2727 0.0 0.0 3736 1192 ? Ss 15:04 0:00
> > inet_gethost 4
> > couchdb 2728 0.0 0.0 3736 108 ? S 15:04 0:00
> > inet_gethost 4
> > root 2982 0.0 0.0 6612 2220 pts/1 S+ 15:30 0:00 grep
> > --color=auto couchdb
> >
> >
> > Any hint will be appreciated.
> >
> > Thank you very much.
> >
> > Alfred.
>
