CPU architektur

Question 1

CPI bedeutet?

Answer 1

Clocks per instruction
referring to the average time in clock cycles for a command to be carried out.
CPI = nc/nI
wobei nc is number of cycles a program needs
und nI is the number of instructions in that program

Question 2

Tp steht für

Answer 2

time a program takes to run a program
Tp = CPI x nI x tc
tc is The length of a cycle
ni number of instructions
CPI cycles per instruction

Question 3

s (speedup) wird wie gerechnet

Answer 3

s = Tp old / Tp new

Question 4

Amdahls law states

Answer 4

The whole system speedup s from a part improvement P equals

s = 1 / ((1 - P) + P/S)

where P would be o.3 if 30% of the computation will be sped up
where S is how much faster that part is running, 2 if twice as fast

Question 5

Combining CPI from different single parts of a set

Answer 5

CPI = Sum of CPIi x fi
i = 1 going to n number of different cpi rates to combine
CPIi times fi where fi equals the part of the whole CPIi represents

Question 6

MIPS steht wofür?

Answer 6

Million instructions per second =
ni (number of instructions) / tp x 10^6 = 
1 / CPI x tc x 10^6
tp how long it takes, time period
tc time per cycle

Question 7

MFLOPS steht wofür

Answer 7

Million floating point operations per second
same as MIPS except ni is replaced with floating point operations per second
= fni / tp x 10^6