For interest: Bugzilla performance

[Myk Melez]

Gervase Markham wrote:

> Pre-changes:  45.9 mails per day over 7 days
> Post-changes: 16.3 mails per day over 12 days 

Note that the number of killed queries varies widely by day of week 
(f.e. there were 6 on Sunday, 17 on Monday, and 50 on Tuesday), so 
measuring two different time periods is likely to throw off the data.

Note also that emails sometimes mention multiple killed queries, 
especially when the queries are generated by a DOS attack.

We stopped a DOS attack last Wednesday evening, not the first we've 
dealt with in the last month, and that may have skewn results both 
before and afterwards.

Still I'm quite happy about these changes, which I think have improved 
performance.

> Further performance changes, which required changes to Bugzilla's 
> code, will kick in at the upgrade on November 8th.

Unfortunately we'll inherit some performance regressions as well from 
some recent code changes (the groups rewrite in particular) that the 
performance improvements will hopefully counteract.

-myk