Hello,
I am running OpenStack on a single physical node, installed with packstack
—allinone. The host has 32gb of memory, 32 logical cores and currently runs a
single VM with 16gb RAM allocated. However, after just a few hours of usage,
the host starts swapping. After inspection of the current memory usage, I see
most of the OpenStack services have spawned multiple processed each which in
total consume about 12gb of memory (shared+resident per process):
MiB Process # processes
3686.4 nova-api 97
2355.2 neutron-server 65
2048 nova-conductor 33
1536 heat-engine 33
819.2 glance-registry 33
657 glance-api 33
504.6 swift-proxy-ser 33
183.9 neutron-metadat 33
168.8 cinder-api 33
According to the docs at
http://docs.openstack.org/liberty/config-reference/content/list-of-compute-config-options.html
<http://docs.openstack.org/liberty/config-reference/content/list-of-compute-config-options.html>,
OpenStack defaults the number of workers for each of this service to the
number of logical cores on the server, but the nova-api and the neutron-servers
seem to have multipliers of 3 and 2 respectively.
Since this machine will only run just a few (3-4) VMs and modifications or
creation of guests will rarely occur once it has been fully set up, what are
the minimum values that I could use in the relevant config files in order to
decrease the memory usage of this services? Can I safely run a single worker
for each of the internal services?
Thanks.
Regards,
Alexander
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