Open Stack

On 10/8/2014 9:21 PM, Joe Gordon wrote:
>
>
> On Wed, Oct 8, 2014 at 6:12 PM, Michael Still <mikal at stillhq.com
> <mailto:mikal at stillhq.com>> wrote:
>
>     On Thu, Oct 9, 2014 at 11:58 AM, Joe Gordon <joe.gordon0 at gmail.com
>     <mailto:joe.gordon0 at gmail.com>> wrote:
>      > On Wed, Oct 8, 2014 at 4:30 PM, Joe Gordon <joe.gordon0 at gmail.com
>     <mailto: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
>
>     I think it would be interesting to break this up by driver
>     directory... Are there drivers which take longer to land code for than
>     others?
>
>
> Like this?
>
> subtree: None (1724 patches):
> Average: 28.7
> median: 11.0
> subtree: nova/virt/ (476 patches):
> Average: 34.5
> median: 18.0
> subtree: nova/virt/hyperv/ (38 patches):
> Average: 46.8
> median: 33.0
> subtree: nova/virt/libvirt/ (224 patches):
> Average: 35.9
> median: 18.0
> subtree: nova/virt/xenapi/ (72 patches):
> Average: 39.5
> median: 20.0
> subtree: nova/virt/vmwareapi/ (134 patches):
> Average: 38.7
> median: 26.0
>
>     >> 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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>      >
>
>     Michael
>
>     --
>     Rackspace Australia
>
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>

That's the distribution, percentage-wise, I'd expect to see for the 4 
in-tree virt drivers.

-- 

Thanks,

Matt Riedemann