[Zope] CacheManager missing in 2.6.2b4 :-(

[Jamie Heilman]

Chris Withers wrote:
> However, I just checked the cache manger stats page today and I'm getting 
> 25 misses per hit, not very good at all :-( To boot, there are 193 entries 
> in the cache for a method that doesn't change, and they're taking up 350kb 
> of RAM for no good reason.

Did you define a non-empty set of request variables?  If so its
entirely possibly thats why there are different entries for the same
method.  Is the method a page template?  RAM Cache Managers are lousy
at caching page templates because page templates store data in their
keywords which can change as the memory usage of your zope process
changes and python re-orders things.

Finally, remember that 350k is an aproximation garnered by the pickle
size of the cached content, its not an exact reflection of the actual
memory consumption, its only ment as a rough guide.
 
> Is this likely to be a bug in 2.6.2b4 or could I haev tweaked something to 
> get these kind of bad results?

Its probably just reflective of some of the design choices behind RAM
Cache Manager.  I wrote a diatribe on caching 2 months ago, check it:
http://marc.theaimsgroup.com/?l=zope&m=105460381811223&w=2

-- 
Jamie Heilman                   http://audible.transient.net/~jamie/
"We must be born with an intuition of mortality.  Before we know the words
 for it, before we know there are words, out we come bloodied and squalling
 with the knowledge that for all the compasses in the world, there's only
 one direction, and time is its only measure."		-Rosencrantz