[webkit-dev] Buildbot Performance

[William Siegrist]

Right now, /results/ is served from the new storage and is receiving test results data since a day or two ago. For anything older, you will get redirected to /old-results/ which is on the old storage. This probably breaks your code if you are trying to load /results/ and walk backwards in revisions. We should probably look at adding some sort of map to the /json/builders/ data instead. 

On a side note, Chromium test results account for 75% of the 700GB of result data, SnowLeopard is 11%, then everyone else. I assume Chromium generating so much more data than everyone else is expected and desired? 

-Bill




On Oct 18, 2010, at 5:04 PM, Eric Seidel wrote:

> The most frequent consumer of the historical data is webkit-patch,
> which uses it to map from revisions to builds:
> http://trac.webkit.org/browser/trunk/WebKitTools/Scripts/webkitpy/common/net/buildbot.py#L109
> 
> It's used when we're walking back through revisions trying to find
> when the build broke, or when the user passes us a revision and
> expects us to know build information about such.
> 
> It's possible we could move off that map with some re-design.
> 
> 
> One thing which would *hugely* speed up webkit-patch failure-reason
> (and sherriff-bot, and other commands which use the
> build_to_revision_map) is if we could make the results/ pages
> paginated.  :)
> 
> 
> I would be nice to keep all the build data for forever.  Even if after
> some date in the past its on a slower server.
> 
> -eric
> 
> 
> On Sat, Oct 16, 2010 at 12:38 AM, William Siegrist <wsiegrist at apple.com> wrote:
>> On Oct 14, 2010, at 10:13 AM, William Siegrist wrote:
>> 
>>> On Oct 14, 2010, at 9:27 AM, William Siegrist wrote:
>>> 
>>>> I am in the process of moving buildbot onto faster storage which should help with performance. However, during the move, performance will be even worse due to the extra i/o. There will be a downtime period in the next few days to do the final switchover, but I won't know when that will be until the preliminary copying is done. I am trying not to kill the master completely, but there have been some slave disconnects due to the load already this morning. I'll let everyone know when the downtime will be once I know.
>>>> 
>>> 
>>> 
>>> The copying of data will take days at the rate we're going, and the server is exhibiting some strange memory paging in the process. I am going to reboot the server and try copying with the buildbot master down. The master will be down for about 15m, if I can't get the copy done in that time I will schedule a longer downtime at a better time. Sorry for the churn.
>>> 
>> 
>> 
>> Most of build.webkit.org is now running on the newer/faster storage. However, the results data[1] is hundreds of gigabytes, going back 6 months, and the new storage is not big enough. Does anyone have any opinion on how much data to keep in results? Does anyone ever look back more than a month or two? For now, the results will still come up a slowly, but hopefully the rest of buildbot is a little more responsive. We're still planning to move all of webkit.org to better hardware soon, but we hit some delays in that process.
>> 
>> [1] http://build.webkit.org/results/
>> 
>> Thanks
>> -Bill
>> 
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