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Chapter 9. Scaling with Multicore Proces... > Operating System Constraints to Scal...

Operating System Constraints to Scaling

Most limitations to scaling are caused by either limitations of the hardware or inefficiencies in the implementation of the actual application. However, as the number of cores increases, it is not uncommon to uncover problems in the operating system or the libraries provided with it.

Oversubscription

Oversubscription is when there are too many active threads on a system. This is not a constraint on the absolute number of threads on the system, only on the number of active threads. If there are continuously more threads requesting CPU time than there are virtual CPUs, then the system may be considered to be oversubscribed.


  

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