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LWN.net Weekly Edition for May 16, 2013
A look at the PyPy 2.0 release
PostgreSQL 9.3 beta: Federated databases and more
LWN.net Weekly Edition for May 9, 2013
(Nearly) full tickless operation in 3.10
in many cases they are not where you expect them to be (the hyperthreaded cpu utilisation is one example, locking overhead with multiple processors is another)
frequently there are factors in play that you don't know about, and the result is that until you test it to a particular load, you have no way of knowing if the system will reach that load.
interpolation (guessing how things work between measured points) is fairly reliable
extrapolation (guessing how things will work beyond measured points) is only reliable until some new factor shows up.
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