Open Stack

It's the first call starting the daemon / loading config files, etc?,

May be that first sample should be discarded from the mean for all 
processes (it's an outlier value).



On 03/21/2014 05:32 PM, Yuriy Taraday wrote:
> On Fri, Mar 21, 2014 at 2:01 PM, Thierry Carrez <thierry at openstack.org
> <mailto:thierry at openstack.org>> wrote:
>
>     Yuriy Taraday wrote:
>      > Benchmark included showed on my machine these numbers (average
>     over 100
>      > iterations):
>      >
>      > Running 'ip a':
>      >                                               ip a :   4.565ms
>      >                                          sudo ip a :  13.744ms
>      >                            sudo rootwrap conf ip a : 102.571ms
>      >                                 daemon.run('ip a') :   8.973ms
>      > Running 'ip netns exec bench_ns ip a':
>      >                   sudo ip netns exec bench_ns ip a : 162.098ms
>      >     sudo rootwrap conf ip netns exec bench_ns ip a : 268.115ms
>      >          daemon.run('ip netns exec bench_ns ip a') : 129.876ms
>      >
>      > So it looks like running daemon is actually faster than running
>     "sudo".
>
>     That's pretty good! However I fear that the extremely simplistic filter
>     rule file you fed on the benchmark is affecting numbers. Could you post
>     results from a realistic setup (like same command, but with all the
>     filter files normally found on a devstack host ?)
>
>
> I don't have a devstack host at hands but I gathered all filters from
> Nova, Cinder and Neutron and got this:
>          method          :    min       avg       max       dev
>                     ip a :   3.741ms   4.443ms   7.356ms 500.660us
>                sudo ip a :  11.165ms  13.739ms  32.326ms   2.643ms
> sudo rootwrap conf ip a : 100.814ms 125.701ms 169.048ms  16.265ms
>       daemon.run('ip a') :   6.032ms   8.895ms 172.287ms  16.521ms
>
> Then I switched back to one file and got:
>          method          :    min       avg       max       dev
>                     ip a :   4.176ms   4.976ms  22.910ms   1.821ms
>                sudo ip a :  13.240ms  14.730ms  21.793ms   1.382ms
> sudo rootwrap conf ip a :  79.834ms 104.586ms 145.070ms  15.063ms
>       daemon.run('ip a') :   5.062ms   8.427ms 160.799ms  15.493ms
>
> There is a difference but it looks like it's because of config files
> parsing, not applying filters themselves.
>
> --
>
> Kind regards, Yuriy.
>
>
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