Hi, It turns out that there is a 1:1 relationship between rpc_thread_pool_size messaging config  and the number of instances that can be spawned simultaneously. Please see bug  for more details. I think this should be at least documented. Thoughts?
Thanks, Oleg  https://github.com/openstack/oslo.messaging/blob/master/oslo/messaging/_executors/impl_eventlet.py  https://bugs.launchpad.net/neutron/+bug/1372049
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