launchpad-dev team mailing list archive

[Elliot Murphy <elliot@xxxxxxxxxxxxx>]

This is *awesome*! I have been thrilled to see the results and also
impressed with the systematic approach towards attacking performance.
Great job everyone!

On Friday, March 18, 2011, Robert Collins <robertc@xxxxxxxxxxxxxxxxx> wrote:
> I meant to send this yesterday.. oops
>
> The hard time is now 11 seconds, and we saw 800 timeouts (about 0.02%
> of requests)
>
> There are about 20 page ids we need to improve before we can drop to
> 10 seconds : there are another 1000 page renders falling between 10
> and 11 seconds at the moment. That means we could be dropping the
> timeout to 10 seconds as early as the start of April... as usual I'll
> be reevaluating as we go.
>
> This is pretty exciting to me: we've come an incredibly long way since
> we started systematically measuring and focusing on render times [as
> the first plank in becoming fast overall] : thats a 9 second drop in 9
> months. I credit our achievement to the following things:
>  - you guys
>  - some small coding rule changes (like permitting cached property on
> model objects, and query count tests)
>  - the restructure allowing folk the time to dig into a timeout
> problem over several days without being pressured by feature work (and
> vice verca, allowing features to be made fast without interrupts for
> day-to-day issues)
>  - a willingness from our user base for us to make engineering
> tradeoffs (such as moving the safety net of the hard timeout every
> time we've got room to improve without causing a mass increase in the
> timeouts, removing features that are underperforming or of little
> benefit but high cst)
>
> I've been casually polling folk as we've gone through the process so
> far, and in the last couple of weeks a very interesting change has
> occured: rather than hearing 'gee LP is slow, its great you are
> improving it, I've notice some improvements already', I'm now hearing
> 'you know, I haven't been pissed off by LP being slow recently.' That
> might come across as faint praise, but its really significant:
>  *** We've moved out of the zomg slow bucket and into the
> just-another-website bucket ***
>
> Now, we have 2 more seconds to drop our hard timeout by, to reach
> Francis' challenge of 9 seconds for the next epic : I'm sure we'll
> manage that without any difficulty.
>
> -woo-
>
> -Rob
>
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-- 
Elliot Murphy | https://launchpad.net/~statik/