Machine A has dual port DRAM system with the same clock for both piped and unpipelined architectures. Machine B has a single port DRAM system, but it's pipeline implementation ha times faster clock rate. Consider ldeal CPI = 1 for both; what are their comparative speed ups Memory Loads are 50% of the instructions executed? Comparative speed up is given by the %3D following equation: Ideal CPI x Pipeline depth Cycle Time, unpipelined Speedup =

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Machine A has dual port DRAM system with the same clock for both piped and unpipelined
architectures. Machine B has a single port DRAM system, but it's pipeline implementation has a 1.1
times faster clock rate. Consider ldeal CPI = 1 for both; what are their comparative speed ups when
Memory Loads are 50% of the instructions executed? Comparative speed up is given by the
following equation:
%3!
Cycle Timenpipelinod
Ideal CPI x Pipeline depth
Ideal CPI + Pipeline stall CPI Cycle Time,ipelined A
Speedup =
O Speedup A / Speedup B = 1.36
O Speedup_B / Speedup A = 1.36
Speedup _B / Speedup A = 1.18
O Speedup B/ Speedup A- 1.5
Transcribed Image Text:Machine A has dual port DRAM system with the same clock for both piped and unpipelined architectures. Machine B has a single port DRAM system, but it's pipeline implementation has a 1.1 times faster clock rate. Consider ldeal CPI = 1 for both; what are their comparative speed ups when Memory Loads are 50% of the instructions executed? Comparative speed up is given by the following equation: %3! Cycle Timenpipelinod Ideal CPI x Pipeline depth Ideal CPI + Pipeline stall CPI Cycle Time,ipelined A Speedup = O Speedup A / Speedup B = 1.36 O Speedup_B / Speedup A = 1.36 Speedup _B / Speedup A = 1.18 O Speedup B/ Speedup A- 1.5
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