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NewsFactor: A Linux Mystery: Configuring for Virtual Processors

Jul 11, 2003, 04:00 (0 Talkback[s])
(Other stories by Vincent Ryan)

"Until recently, application multithreading--breaking up pieces of a monolithic application to allow parallel processing, which speeds up performance--was not as beneficial with Linux as with other Unix-related operating systems. Then companies like Red Hat did a ground-up redesign of multithreading libraries that eliminated bottlenecks, such as the hard limit on the number of threads an application could create.

"But no sooner was that problem solved than Intel came out with hyperthreading, or simultaneous multithreading, a technique that makes a single physical processor appear to an operating system as if it were two logical processors. Hyperthreading support was built into the Linux 2.4 and 2.5 code bases, but some experts note there are still some hitches that could warrant turning the feature off..."

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