Hyper-Threading Technology Architecture and Microarchitecture


Intel’s Hyper-Threading Technology brings the concept

of simultaneous multi-threading to the Intel

Architecture. Hyper-Threading Technology makes a

single physical processor appear as two logical

processors; the physical execution resources are shared

and the architecture state is duplicated for the two

logical processors. From a software or architecture

perspective, this means operating systems and user

programs can schedule processes or threads to logical

processors as they would on multiple physical

processors. From a microarchitecture perspective, this

means that instructions from both logical processors

will persist and execute simultaneously on shared

execution resources.

This paper describes the Hyper-Threading Technology

architecture, and discusses the microarchitecture details

of Intel's first implementation on the Intel Xeon

processor family. Hyper-Threading Technology is an

important addition to Intel’s enterprise product line and

will be integrated into a wide variety of products.

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