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On Wed, Oct 8, 2014 at 4:30 PM, Joe Gordon <joe.gordon0 at gmail.com> wrote:

> Recently there has been a lot of discussion around the development growing
> pains in nova. Instead of guessing about how bad some of the issues are, I
> tried to answer a few questions that may help us better understand the
> issues.
>
>
> Q: How many revisions does it take to merge a patch?
>
> Average: 6.76 revisions
> median: 4.0 revisions
>
>
> Q: How many rechecks/verifies does it take to merge a patch (ignoring
> rechecks where the same job failed before and after)?
>
> Average: 0.749 rechecks per patch revision
> median: 0.4285  rechecks per patch revision
>
> For comparison here are the same results for tempest, which has a lot more
> gating tests:
>
> Average: 1.01591525738
> median: 0.6
>
>
> Q: How long does it take for a patch to get approved?
>
> Average: 28 days
> median: 11 days
>
>
> Q: How long does it take for a patch to get approved that touches
> 'nova/virt/'?
>
> Average: 34 days
> median: 18 days
>
>
To expand on these numbers, same results for last 6 months of commits:

all of nova (1723 patches):
Average: 28.8
median: 11.0

nova/virt (476 patches):
 Average: 34.5



>
> When looking at these numbers two things stick out out:
>
> * We successfully use recheck an awful lot. More then I expected
> * Patches that touch 'nova/virt' take about 20% more time to land or about
> 6 days. While that is definitely a difference, its smaller then I expected
>
>
> Dataset: last 800 patches in nova
> Code: https://github.com/jogo/gerrit-fun
>
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