[ZODB-Dev] ZEO LoadEx?

[Pascal Peregrina]

Hi,

This reminds me something I noticed when we migrated from 2.7 to 2.8
Our issue was a very big PersistentMapping based tree of objects, which was involved in a lot of RW and RO transactions from different Zope instances (we use ZEO of course). There was no miracle to solve the issue; we had to change the structure to BTree.

Pascal

-----Message d'origine-----
De : zodb-dev-bounces+pperegrina=lastminute.com at zope.org [mailto:zodb-dev-bounces+pperegrina=lastminute.com at zope.org] De la part de Chris Withers
Envoyé : mardi 20 juin 2006 08:31
À : Tim Peters
Cc : zodb-dev
Objet : Re: [ZODB-Dev] ZEO LoadEx?

Tim Peters wrote:
> Sure, but no way to guess from here.  The only thing I can really
> guess from the above is that your client is going to the server a lot
> to get data.

Well, the client and the server are on the same machine, which isn't 
load or memory bound, and doesn't seem to be i/o bound either.

> revision in the ZEO client cache.  If the sloth is acute for a period
> following  client startup, but gets better over time, then the lack of
> a persistent client cache would be the obvious suspect.

Right, that's true enough, and I'd also expect it.

But, there also seems to be (to my untrained eye) random periods of 
slowness from then onwards, again, without any apparent signs of excess 
load, memory usage or disk i/o.

I'm somewhat flumoxed as to where to go from here on the debugging front...

Chris

-- 
Simplistix - Content Management, Zope & Python Consulting
            - http://www.simplistix.co.uk

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