Am I gleaming from that that you are proposing a less-is-more approach to threads?
Here is what I have been using: - Zope 2.7.8 (Plone 2.1.2) - RH Linux - AMD Athlon 64 3200+ 2.0 GHz - 2GB DDR RAM - 120,000 hits a day - 392,036 objects in database - 2 threads - 100,000 object cache size This seems to eat up about half of the RAM on the server. Would one thread but double the cache size do better? Jake _______________________ http://www.ZopeZone.com On Tue, January 31, 2006 2:40 pm, Dieter Maurer said: > Jens Vagelpohl wrote at 2006-1-31 15:07 +0000: >>On 31 Jan 2006, at 15:01, Jake wrote: >> >>> http://plone.org/documentation/how-to/threads-vs-cache-size >> >>That article contains little information to back up the conclusions, >>and some of it is patently wrong. Another case of hearsay and half- >>thruths being propagated by well-meaning but uninformed parties. > > There is a convincing example (I think from Matt Kromer) what > happens to "mean response time" when the number of threads > is increased from 1 to 2: > > Assume you have 2 units of work. If you have a single > thread, 1 unit is done, then the second. The > mean response time is (1 + 2) / 2 = 1.5. > > Now assume you have two threads (but a single processor). > Both threads work (quasi) parallel but have only half of the > processor power. Both will take 2 time units to perform > their unit of work. The mean response time is (2 + 2) / 2 = 2. > > You get the same ratios whenever you double the number of threads > (but keep the number of processors and all your work is CPU bound). > > > Things become more difficult when you have a mix of very small > requests and very long requests. You then may want a higher > level of concurrency to not let the small requests being > blocked by the long ones. > > > -- > Dieter > _______________________________________________ > Zope maillist - Zope@zope.org > http://mail.zope.org/mailman/listinfo/zope > ** No cross posts or HTML encoding! ** > (Related lists - > http://mail.zope.org/mailman/listinfo/zope-announce > http://mail.zope.org/mailman/listinfo/zope-dev ) > _______________________________________________ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )