Multiprocessing: Difference between revisions
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== SMT (Simultaneous Multithreading) ==
Normally a CPU executes one stream of instructions, where at any time some parts of the CPU may be busy and other parts of the CPU may be idle (e.g. while doing integer instructions parts of the CPU that do floating point calculations may be unused), and where the entire CPU may be idle in some cases (e.g. when the CPU needs to wait until data arrives from RAM before it can continue). The idea behind [[SMT]] is to execute more than one stream of instructions, which increases overall performance by reducing the chance that
From the operating system's perspective, SMT looks a lot like SMP, except for performance characteristics. For SMT a single physical CPU executes multiple "threads" (or logical CPUs), and the performance of one thread/logical CPU is effected by work done by other threads/logical CPUs in the same physical CPU/core (as the physical CPU's resources are shared).
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