Comment 4 for bug 1838689

Reviewed: https://review.opendev.org/674125
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=61d149c0123997accc5c48994d7a4d1514eb49c9
Submitter: Zuul
Branch: master

commit 61d149c0123997accc5c48994d7a4d1514eb49c9
Author: Adam Spiers <email address hidden>
Date: Thu Aug 1 20:37:09 2019 +0100

    Fix default RPC worker count

    The help for the rpc_workers config option is:

        Number of RPC worker processes for service. If not specified, the
        default is equal to half the number of API workers.

    However, this does not accurately describe the current behaviour,
    which is to default to half the _default_ number of API workers. This
    can make a big difference; for example on a 256-CPU machine with 256GB
    of RAM which has api_workers configured to 8 but rpc_workers not
    configured to anything, this will result in 64 RPC workers, which is 8
    for every API worker!

    Therefore tweak the default to rely on the actual value of
    api_workers, which may be different than the default value.

    Change-Id: I26115932ef4775f157297be1637ee26a4fca4666
    Related-Bug: #1838688
    Closes-Bug: #1838689