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Simultaneous multithreading

Simultaneous multithreading (SMT) is a technique for improving the overall efficiency of superscalar CPUs with hardware multithreading. SMT permits multiple independent threads of execution to better use the resources provided by modern processor architectures.

History, Modern commercial implementations & Historical implementations

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Modern commercial implementations

IntelPentium 4Hyper-Threading TechnologyReplay systemTLBs
31 related topics

Historical implementations

ACS-360Alpha 21464DECHPCompaq
5 related topics

Details

Page tablesI/O permissionsProtection ringsPreemptive multitaskingTemporal multithreading
9 related topics

Disadvantages

APIHwlocNUMAPrime95NetBurst
7 related topics

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Overview

Details

Taxonomy

Historical implementations

Modern commercial implementations

Disadvantages

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Map overview Semantic statistics

Simultaneous multithreading

Nodes70
Edges69
Triples69
Avg. degree1.97
Density0.028571
Components1

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Simultaneous multithreading

Top relations

related to Historical implementations · 23
Simultaneous multithreading → ACS-360, Alpha, California, Compaq, CPUs, Dean Tullsen, Dean Tullsen's, DEC, EV8, Henry Levy, HP, IBM, Intel Pentium, Northwood, Prescott, San Diego, SMT, Susan Eggers, The, This
related to x86/x86-64 · 16
Simultaneous multithreading → Core, GHz, Hyper-threading, Hyper-Threading Technology, Intel, Nehalem, Pentium, Prescott, SMT, SMT Pentium, The, The Intel Atom, The Intel Pentium, The Pentium, This, TLBs
related to Details · 10
Simultaneous multithreading → Although, CPU, I/O, In, Multithreading, Simultaneous, SMT, The, This, Two
related to Disadvantages · 8
Simultaneous multithreading → API, Critics, Newer SMT, NUMA, Prime95, SMT, Some, There
related to Security concern · 5
Simultaneous multithreading → Black Hat, HT, Intel's, NetBurst-based, There

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Important terminology

smt multithreading threads processor one core thread two simultaneous resources intel instructions also time cores multiple ibm cycle per performance

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
memory accessinstance ofSMT is about hiding stalls during high-latency activities0.80text
therefore increasing efficiency as well as throughput of computations per amount of hardware used by making more use of existing resourcesinstance ofSMT is about hiding stalls during high-latency activities0.80text
bandwidthinstance ofincreasing contention for resources0.80text
cachesinstance ofincreasing contention for resources0.80text
TLBsinstance ofincreasing contention for resources0.80text
re-order buffer entriesinstance ofincreasing contention for resources0.80text
and equalizing the processor resources between the two programs which adds a varying amount of execution timeinstance ofincreasing contention for resources0.80text
Simultaneous multithreadingrelated to DetailsThe0.60section
Simultaneous multithreadingrelated to DetailsCPU0.60section
Simultaneous multithreadingrelated to DetailsI/O0.60section
Simultaneous multithreadingrelated to DetailsAlthough0.60section
Simultaneous multithreadingrelated to DetailsMultithreading0.60section

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