[Zope3-Users] threads, pool size and cache recommendations (quad core)

[Andreas Jung]

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schrieb Roy Mathew:
> Folks, I am looking for some configuration advice.
>
> I am running a zope3 application that uses the ZODB. I expect a
> peak load of a 100 concurrent users, and am on a *quad* core Intel
> Xeon Linux box. Am I better off running 2 or 3 ZEO clients talking
> to the app-server (I am assuming that the OS will load balance so
> that all processors are utilized well). Or should I not use ZEO at
> all, and simply assign a large cache, a large connection pool and
> lots of threads to a single process. I am sure that this is an
> issue many of you have had to contend with. I would appreciate some
> rough idea of what the numbers should be for each of the 2
> scenarios I outline.
>
The number of worker threads (and clients) basically depends on how much
concurrent requests you have. Four worker threads can deal with 100
requests/second
when each request can be processed fast. Long running requests will
block other
requests...so you must measure how long a request takes in average..then
you can do your own calculations. The cache size depends on various
factors..
you have to check the ZODB activity in order to perform fine-tuning.
There is neither a golden bullet nor a recipe for the perfect
setup...start with
a common setup of two clients or so and see how far you can go...then
adjust
your parameters over time.

- -aj
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