計算機組織與結構 筆記2

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Daisy Chain
CPU效能=秒數÷程式= 指令數÷程式 × 平均週期數÷指令 × 秒數÷週期。

 MIPS ( Million Instruction Per Second )

 EX:
Clock-Rate = 200Mhz
CPI = 4
Performance ? (MIPS)
1. 1÷200M = 5ns
2. 5ns × 4 = 20ns
∴ 1÷20ns = 50 MIPS

 CPU time = Clock cycle time × CPI × IC (Instruction Count)
Clock cycle = 1 ÷ Clock Rate
CPU time = (CPI × IC) ÷ Clock Rate

 CPU I/O 定址
1. Memory mapped

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UVA 11321 Java

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import java.util.*; import static java.lang.System.*; public class main{ public static void main(String[] args) { Scanner sc=new Scanner(System.in); while(sc.hasNextInt()) { int num = sc.nextInt(); int m = sc.nextInt(); System.out.printf("%d %d\r\n", num, m); if(num == 0&& m == 0) break; Data[] datas = new Data[num]; for(int i = 0; i < num; i++) { int n = sc.nextInt(); datas[i] = new Data(n, n % m, n % 2 == 0); } Arrays.sort(datas); for(int i = 0; i < num; i++) { System.out.println(datas[i].toString()); } } } public static class Data implements Comparable { int n; int r; boolean even; Data(int n, int r, boolean even) { this.n = n; this.r = r; this.even = even; } public String toString() { return Integer.toString(this.n); } @Override public int compareTo(Data other) { if(this.r != other.r) return this.r < other.r ? -1 : 1
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