vector - Department of Computer Science

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Multiscalar Vectors Are Inexpensive • N ops per cycle ⇒ Ο(Ν 2 ) circuitry • HP PA-8000 • 4-way issue • reorder buffer alone: 850K transistors • incl. 6,720 5-bit register number comparators Vector • N ops per cycle ⇒ Ο(Ν + εΝ 2 ) circuitry • UCB-T0 Integer vector µP • 24 ops per cycle • 730K transistors total • only 23 5-bit register number comparators • Integer, no floating point 3/22-24/11 CSE502-S11, Lec 14+15-Vector 14
Single-issue Scalar Vectors Lower Power • One instruction fetch, decode, dispatch per operation • Arbitrary register accesses, adds area and power • Loop unrolling and software pipelining for high performance increases instruction cache footprint • All data passes through cache; waste power if no temporal locality • One TLB lookup per load or store • Off-chip access is via whole cache lines Vector • One inst fetch, decode, dispatch per vector • Structured register accesses • Smaller code for high performance, less power in instruction cache misses • Bypass cache • One TLB lookup per group of loads or stores • Move only necessary data across chip boundary 3/22-24/11 CSE502-S11, Lec 14+15-Vector 15
Page 1 and 2: CSE 502 Graduate Computer Architect
Page 3 and 4: Scalar Registers r15 r0 Vector Prog
Page 5 and 6: Vector Arithmetic Execution • Use
Page 7 and 8: Properties of Vector Processors •
Page 9 and 10: Common Vector Metrics • R ∞ : M
Page 11 and 12: Memory operations • Load/store op
Page 13: How Get Full Bandwidth if Unit Stri
Page 17 and 18: Outline • Vector Processing Overv
Page 19 and 20: Supercomputers “Definitions” of
Page 21 and 22: Single Ported Memory 16 banks of 64
Page 23 and 24: Vector Memory-Memory versus Vector
Page 25 and 26: Vector Memory-Memory vs. Vector Reg
Page 27 and 28: Modern Vector Supercomputer: NEC SX
Page 29 and 30: NEC ESS - Earth Simulator System (n
Page 31 and 32: ESS - complete system installed 4/1
Page 33 and 34: Outline • Vector Processing Overv
Page 35 and 36: Vector Registers Lane Vector Unit S
Page 37 and 38: Vector Stripmining Problem: Vector
Page 39 and 40: Vector Chaining • Vector version
Page 41 and 42: Vector Startup Two components of ve
Page 43 and 44: Vector Scatter/Gather Want to vecto
Page 45 and 46: Scatter example: Vector Scatter/Gat
Page 47 and 48: Masked Vector Instruction Implement
Page 49 and 50: Vector Reductions (vector values =>
Page 51: And in Conclusion [Vector Processin

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