On Sun, Sep 19, 2010 at 3:13 PM, Aidan Thornton <makos...@gmail.com> wrote:
> On 9/19/10, Argent Stonecutter <secret.arg...@gmail.com> wrote: > > Perhaps Tateru was referring to the prim data changing (eg, geometry) > while > > the prim UUID stays the same. I don't think the viewer makes any > assumptions > > about prims being unchanged from session to session, so that's not > something > > that would need to be verified in the cache. > > Actually, I'm pretty sure it does, at least in viewer versions where > caching hasn't accidentally been rendered totally ineffective by a Linden > Labs > typo. In fact, there's a fairly elaborate system for caching prim data > to disk. As I recall, it detects changed prims using the CRC field, > which is completely misnamed and is really a generation counter that > records the number of changes to the prim. Then there's the CacheID, > which invalidates the whole sim's cached data where necessary (e.g. if > the sim moves or crashes, or perhaps even if it just restarts at all - > would have to ask one of the Lab folks). > > This is pretty accurate. I think the CacheID only changes if the format of the cache changes, and so should be pretty rare. I'm not 100% sure on that though.
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