launchpad-dev team mailing list archive

[John Arbash Meinel <john@xxxxxxxxxxxxxxxxx>]

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On 4/5/2011 10:52 AM, Robert Collins wrote:
> So I made some time today, and I've got most of a rewritten
> BatchNavigator that will let us use indexable DB constraints rather
> than  large OFFSET values to navigate batches. This has come up in
> previous performance centric mails on this list, and Jeroen had a
> really clear description of the semantic problems we have with
> batching that he presented during the Epic - this work should go a
> fair way towards addressing both of those things (at the cost of some
> fuzziness around what 'page 3' actually means).
> 
> The core grungy is roughly done, I have 'merely' integration glue - to
> make sure that the existing URL's wont break and that the generation
> of URLs adjacent to the current batch is done cheaply (e.g. without
> materialising the adjacent batches).
> 
> I'll skip the details for now, as its not done and is subject to
> change without notice, but the code is at
> lp:~lifeless/lazr.batchnavigator/keyoffset if you're interested in
> playing around.
> 
> Cheers,
> Rob
>

Do you have any numbers for real performance?

John
=:->

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