[ZODB-Dev] ZEO 2

[Shane Hathaway]

Chris Withers wrote:
> Shane Hathaway wrote:
> 
>>> How do I tell how big the ZODB cache should be?
>>
>>
>> If the activity graph shows that you're loading many objects per hour, 
>> the cache probably needs to be bigger.  If you can reduce the cache 
>> size without a noticeable impact during peak times, reduce it.
> 
> 
> Okay, next question. What caches does that graph actually cover? I have 
> 3 storages served by a storage server. On the clients, two of the 
> storages are mounted into the other using external mounts.
> 
> So, what caches do the graphs in the control panel cover?

The standard control panel only shows you activity in the main database. 
  However, the DBTab product, which supercedes ExternalMount, and which 
I officially released yesterday, patches the control panel to show you 
statistics about all databases.

>> Hmm, I guess a more precise calculation would be based on cache 
>> "turnover"--a count of objects that get flushed out of the cache then 
>> reloaded soon after.  
> 
> 
> Could this be added as a statistic to that graph?

It's worth thinking about, but not a priority.

Shane