On 2010-08-17 01:24, Robert Collins wrote:
Firstly is that caching is only a small benefit itself: it saves us doing precisely identical work for the life of the cache. However caching in the model layer is a prerequisite to *prepopulating the caches*, which is where we get the major wins: that lets us eliminate repeated similar work by doing one query for a set of data rather than one query per related thing *per row*. So the gain of caching everything vs caching what we've figured out is safe is relatively small, because the incremental gain from both of these things is small without other work, and that other work will apply to read only and readwrite transactions.
It may help to distinguish between prefetching, batch-fetching, and caching here. The caching is instrumental, but not the whole story.
Jeroen _______________________________________________ Mailing list: https://launchpad.net/~launchpad-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~launchpad-dev More help : https://help.launchpad.net/ListHelp
