Since then, Intel has included this technology in Itanium, Atom, and Core 'i' Series CPUs, among others.įor each processor core that is physically present, the operating system addresses two virtual (logical) cores and shares the workload between them when possible. It was introduced on Xeon server processors in February 2002 and on Pentium 4 desktop processors in November 2002. Hyper-threading (officially called Hyper-Threading Technology or HT Technology and abbreviated as HTT or HT) is Intel's proprietary simultaneous multithreading (SMT) implementation used to improve parallelization of computations (doing multiple tasks at once) performed on x86 microprocessors. In this high-level depiction of HTT, instructions are fetched from RAM (differently colored boxes represent the instructions of four different processes), decoded and reordered by the front end (white boxes represent pipeline bubbles), and passed to the execution core capable of executing instructions from two different programs during the same clock cycle.
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