On 07/25/2013 04:21 PM, Joe Gordon wrote:
Hi All,
We have recently hit some performance issues with nova-network. It
turns out the root cause of this was we do roughly 20 rootwrapped shell
commands, many inside of global locks.
(https://bugs.launchpad.net/oslo/+bug/1199433)
It turns out starting python itself, has a fairly significant overhead
when compared to the run time of many of the binary commands we execute.
For example:
$ time python -c "print 'test'"
test
real0m0.023s
user0m0.016s
sys0m0.004s
$ time ip a
<...>
real0m0.003s
user0m0.000s
sys0m0.000s
While we have removed the extra overhead of using entry points, we are
now hitting the overhead of just shelling out to python.
Hey Joe,
Just ask a question of you personally, off list... I was curious about
the above statement about entry points. Could you elaborate a bit there?
I thought OpenStack had moved *to* using entry points with stevedore?
Did this change recently?
Best,
-jay
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