[Zope] caching and Squid (was Urgent help needed: Zope falls over under moderate load)

[bak (kedai)]

> Didn't someone make a RAM Cache Manager with a max age thing?  I swear
> I remember seeing it posted on Zope.org.

yes.  someone did.  but i discovered it a bit late, as i've replaced the 
2.3.x StandardCacheManager with 2.4.x :P

all's working now, i hope

>
> The nuances of the cache manager baffle me as well, and I'll need to
> defer mostly to Shane, but I *think* that at least for the RAM cache
> the REQUEST variables listed are used as part of the key into the big
> "cache dict" where things are held.
>
> This means that, if, for example, you've got AUTHENTICATED_USER as a
> request variable, if the AUTHENTICATED_USER is "fred" when you cache
> one page, another user "bob" won't see fred's cached page (which might
> contain his name).  However you *will* still be able to cache the page
> for fred.. the next time you ask for the page, a customized "fred"
> version will be served from cache.  The more variables that are
> different and listed, the more RAM will be consumed for slightly
> different versions of the same page.

ok.  there's two places where we can define this.  the cache manager, and the 
methods cache tab.

consider this:
-we define REQUEST variables AUTHENTICATED_USER at the cache manager setting
 we dont define anything at the method cache tab

-or we have somevar as the REQUEST variables in the method cache tab, and 
only 	AUTHENTICATED_USER in the cache manager setting.

there's so many combinations that boggles the mind.


>
> There was recently a Zope-maillist posting by Sebas ICK that quoted
> Richard Barrett which goes in to some speculative detail about using
> Squid to front end for multiple Zopes.  If it's accurate, it should
> really be cleaned up and turned into a howto.

http://aspn.activestate.com/ASPN/Mail/Message/906749

i need to relook at this.
what i have now:
	   __ zeo client -----------
	   |     :                         |
lvs --------|     :                          |-----zeo server
	   |__zeo client------------|

so with squid in the picture, i guess it'd be before lvs ..?

thanks to sean, i know what i missed when trying squid with zeos.  a 
redirector. (the squid virtual stuff pulls me of track :))

> I'd consider something like Squid to do the job of taking the load off
> your servers.  It's a learning experience, but probably worth it for a
> site like yours.

i'll look into this.

thanks all

>
> - C