I wrote an app to test this; it looks like there is currently a per- app hard limit of ~10mb in the entire cache (that's compressed data; not text) and maybe a ~22k hard key/value limit as well. These may even be burst limits, because a few minutes later I can only squeeze 8.9mb into the cache and that number has been gradually falling from 10.
Hopefully in the future we can buy our memcache quota. I really like the idea of using memcache for non-critical deferred writes as discussed in Google IO, but nervous about building an app around this usage pattern when the behavior of the cache is so unspecified. On Aug 26, 2:43 pm, Devel63 <[email protected]> wrote: > Can someone from Google comment on this? This seems pretty > important... > > You don't have to give a hard number, but 8K items isn't much, and > could cause some re-architecting to be needed. > > On Aug 25, 6:13 am, Colin <[email protected]> wrote: > > > Mymemcachestats, expire time is 48h, non of the itemd are older than > > 5h, but often items that should be in the cache aren't there: > > - items: 8423 > > - bytes: 10655912 > > > I (wrongly) assumed that i hit the size limit once i had 25mb of data > > inmemcache, i optimized (compressed and pickled data before putting > > it in the cache) and now i hit the limit at roughly 10mb :/ > > Thus my conclusion: there is an item limit at about 8k. > > > On 13 aug, 17:11, ted stockwell <[email protected]> wrote: > > > > Hi Jeff, > > > > A question.... > > > Can I assume that thememcachesize limit will increase as the number > > > of servers running my application increases? > > > > On Aug 10, 5:53 pm, "Jeff S (Google)" <[email protected]> wrote: > > > > > The overallmemcachesize limit is not set in stone so we usually don't > > > > give > > > > a hard number as whatever I say might soon be out of date. I recommend > > > > using > > > > as you need it because if your app goes over it's allotment, then the > > > > less-used data is evicted. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
