Hi, Karl Arao described the impact of CPU hyper threading (and turbo boost) with an example in its webinar very well. Just start at round about 40:10 min. Further explanations are in the beginning as well. http://allthingsoracle.com/enkitec-red-gate-webinar-where-did-my-cpu-go/ Best Regards Stefan Koehler Oracle performance consultant and researcher http://www.soocs.de > rjgoulet@xxxxxxxxxxx hat am 27. Oktober 2014 um 15:57 geschrieben: > > Anyone with an opinion on Hyperthreading? Is it worth the effort? -- //www.freelists.org/webpage/oracle-l