that's interesting Barry. I had assumed each user had their own dedicated quota, which I guess would be wasteful.
Has anyone done tests of the eviction rates? On Oct 29, 11:41 pm, Barry Hunter <[email protected]> wrote: > memcache is a shared system. Everybody uses from the same 'pool'*. So > if the system as a whole is running out of memory maybe your data will > get evicted. > > Some have stated there is also a per user limit (perhaps 10Mb - but it > could change). > > As others have stated - never design that the data will be thare later > (maybe the memcache node your data was on was restarted or crashed) - > its a temporally cache. If you find a cached value, bonus(!), > otherwise just generate the data like you where going to anyway. > > * I beleive that is how Google have implemented it anyway. > > 2009/10/29 Baron <[email protected]>: > > > > > ah OK. > > > Do you know how much memcache memory each app can use before values > > start being evicted? > > The quota page lists the daily rate as 10GB, but not the size. > > > On Oct 29, 4:32 pm, ryan baldwin <[email protected]> wrote: > >> That is incorrect. The value can be ejected from Memcache at any time. As > >> some of the Googlers have stated in the groups, you should not design your > >> applications to depend on a persistent cache. > > >> - ryan. > > >> On Wed, Oct 28, 2009 at 11:25 PM, Baron <[email protected]> wrote: > > >> > Hello, > > >> > If I store only a single int in my app memcache, how long can I expect > >> > it so stay cached? > > >> > According to the docs "Values may be evicted from the cache when a new > >> > value is added to the cache if the cache is low on memory." > >> > So then in the case of my single int there should be no memory > >> > problems and the data will last indefinitely. Is that right? > > >> > thanks > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
