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[qa][openstackclient] Debugging devstack slowness


Just a reminder that there is also 
http://lists.openstack.org/pipermail/openstack-dev/2016-April/092546.html 
which was intended to address this same issue.

I toyed around with it a bit for TripleO installs back then and it did 
seem to speed things up, but at the time there was a bug in our client 
plugin where it was triggering a prompt for input that was problematic 
with the server running in the background. I never really got back to it 
once that was fixed. :-/

On 7/26/19 6:53 PM, Clark Boylan wrote:
> Today I have been digging into devstack runtime costs to help Donny Davis understand why tempest jobs sometimes timeout on the FortNebula cloud. One thing I discovered was that the keystone user, group, project, role, and domain setup [0] can take many minutes [1][2] (in the examples here almost 5).
> 
> I've rewritten create_keystone_accounts to be a python tool [3] and get the runtime for that subset of setup from ~100s to ~9s [4].  I imagine that if we applied this to the other create_X_accounts functions we would see similar results.
> 
> I think this is so much faster because we avoid repeated costs in openstack client including: python process startup, pkg_resource disk scanning to find entrypoints, and needing to convert names to IDs via the API every time osc is run. Given my change shows this can be so much quicker is there any interest in modifying devstack to be faster here? And if so what do we think an appropriate approach would be?
> 
> [0] https://opendev.org/openstack/devstack/src/commit/6aeaceb0c4ef078d028fb6605cac2a37444097d8/stack.sh#L1146-L1161
> [1] http://logs.openstack.org/05/672805/4/check/tempest-full/14f3211/job-output.txt.gz#_2019-07-26_12_31_04_488228
> [2] http://logs.openstack.org/05/672805/4/check/tempest-full/14f3211/job-output.txt.gz#_2019-07-26_12_35_53_445059
> [3] https://review.opendev.org/#/c/673108/
> [4] http://logs.openstack.org/08/673108/6/check/devstack-xenial/a4107d0/job-output.txt.gz#_2019-07-26_23_18_37_211013
> 
> Note the jobs compared above all ran on rax-dfw.
> 
> Clark
>