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Lecture_14 - ECE 445 Computer Organization...

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ECE 445 – Computer Organization Pipelining (Lecture #14)
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ECE 445 - Computer Organization 2 Single-Cycle Implementation of the MIPS Datapath
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ECE 445 - Computer Organization 3 MIPS Datapath
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ECE 445 - Computer Organization 4 Performance Issues of non-Pipelined Single-Cycle Datapaths
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ECE 445 - Computer Organization 5 Performance Issues Longest delay determines clock period - Critical path : load word (lw) instruction - Instruction memory register file ALU data memory register file Not feasible to vary period for different instructions Violates design principle - Making the common case fast Improve performance by pipelining
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ECE 445 - Computer Organization 6 Pipelining Analogy
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ECE 445 - Computer Organization 7 Pipelining Analogy Sequential operation - Each load of laundry must be completed before the next one can be started. Wash = 30 minutes Dry = 30 minutes Fold = 30 minutes Store = 30 minutes - Each load of laundry requires 2 hours. - Four loads of laundry completed in 8 hours One load of laundry
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8 Pipelining Analogy Parallel operation - Overlap tasks - Only one washer, one dryer, one person to fold, one person to store - Four (4) stages Wash = 30 minutes Dry = 30 minutes Fold = 30 minutes Store = 30 minutes - Each load of laundry requires 2 hours. - Four loads of laundry completed in 3.5 hours speedup = 8 hours / 3.5 hours speedup = 2.3
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ECE 445 - Computer Organization 9 Objective: Keep all stages of the pipeline busy at all times.
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ECE 445 - Computer Organization 10 Pipelining: Improving Performance Latency Max. Throughput Non-Pipelined 2 hours 0.5 Pipelined 2 hours 2 Latency = time from start of one load to the end of same load.
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