Section 1.10 cites as a pitfall the utilization of a subset of the performance equation as a performance metric. To illustrate this, consider the following two processors. P1 has a clock rate of 4 GHz, average CPI of 0.9, and requires the execution of 5.0E9 instructions. P2 has a clock rate of 3 GHz, an average CPI of 0.75, and requires the execution of 1.0E9 instructions. (a)One usual fallacy is to consider the computer with the largest clock rate as having the largest performance. Check if this is true for P1 and P2. (b)Another fallacy is to consider that the processor executing the largest number of instructions will need a larger CPU time. Considering that processor P1 is executing a sequence of 1.0E9 instructions and that the CPI of processors P1 and P2 do not change,

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Section 1.10 cites as a pitfall the utilization
of a subset of the performance equation as a
performance metric. To illustrate this, consider the
following two processors. P1 has a clock rate of 4
GHz, average CPI of 0.9, and requires the execution
of 5.0E9 instructions. P2 has a clock rate of 3 GHz,
an average CPI of 0.75, and requires the execution of
1.0E9 instructions.
(a)One usual fallacy is to consider the computer
with the largest clock rate as having the largest
performance. Check if this is true for P1 and P2.
(b)Another fallacy is to consider that the processor
executing the largest number of instructions will
need a larger CPU time. Considering that processor
P1 is executing a sequence of 1.0E9 instructions and
that the CPI of processors P1 and P2 do not change,
determine the number of instructions that P2 can
execute in the same time that P1 needs to execute
1.0E9 instructions.
Transcribed Image Text:Section 1.10 cites as a pitfall the utilization of a subset of the performance equation as a performance metric. To illustrate this, consider the following two processors. P1 has a clock rate of 4 GHz, average CPI of 0.9, and requires the execution of 5.0E9 instructions. P2 has a clock rate of 3 GHz, an average CPI of 0.75, and requires the execution of 1.0E9 instructions. (a)One usual fallacy is to consider the computer with the largest clock rate as having the largest performance. Check if this is true for P1 and P2. (b)Another fallacy is to consider that the processor executing the largest number of instructions will need a larger CPU time. Considering that processor P1 is executing a sequence of 1.0E9 instructions and that the CPI of processors P1 and P2 do not change, determine the number of instructions that P2 can execute in the same time that P1 needs to execute 1.0E9 instructions.
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