a) Your system may be I/O bound - not CPU bound - so you will never see the CPU max out because the limiting factors are memory and disk/ network access.

b) Make sure to tune Python's checkinterval. While you should *always* do that, it is especially important on multi-processor/multi- core hardware. The rule of thumb is to run the pystone benchmark, divide the "pystones" your machine benchmarks at by 50, and put the result into etc/zope.conf.


e.g:
python-check-interval 1000

Once you get the checkinterval right, playing with processor affinity becomes a pointless exercise, in my experience.

c) Always use profiling tools for performance analysis. "Guessing" rarely leads to effective optimizations. ZopeProfiler and PTProfiler come to mind.

HTH,
Stefan


On 15. Mär 2006, at 21:45, Hugo Ramos wrote:

Yellow,

I'm using Zope+Apache on a 4 xeon's/4GB ram machine running Debian.
I've noticed that the CPU's never go beyond 30% top occupation... but
on rush hours the site takes too long to load...

I've been reading about process affinity and how it could speed up
everything by making zope run on 1 CPU, Apache on another and so on...

Has any1 tried this before? Can you point me to some documentation?
What's your experience? is it true that not doing this the 4 cpu's
will not be 100% used?

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