과제2: 개발 / 실행 / 분석

• 5(4)명이 1 team으로 작업
  • 조장(1) , 조원(나머지)
  • 각조에 대하여 조장이 maintainer인 repository DevSetN부여
    • DevSet2, DevSet2, … DevSet9
    • DevSet1 repository 에 guide 등 관련 내용 posting
    • Repository DevSetN 은 조장(maintainer)만 push 할 수 있음
    • 조원은 maintainer에게 PR을 통하여 push 가능
  • 각 repository에는 다음의 file 들이 생성되어야 함
    • README. md : 과제진행에 대한 설명, 역할분담 등등
    • FINAL.md : 과제 결과 분석에 대한 내용 기록(진행과정 포함) +Source files
• Works to do
  • Implementation of each code
    • Unit test for implementations
      • Periodic(or continuous) build and smoke test
    • Performance tuning
    • Due to June 21st
• 수행방법은 조별로 협의를 통하여 결정하여 실행
  • 모든 조원이 아래 각 부문에 역할이 정의되고 실행되어야 함
    • Implementation of code(unit test를 포함하여)
    • Performance 측정을 통한 분석 및 개선

Problem: SET Implementation

• A sorted sequence of m random integers in [0, maxval), without duplicates
  • SET implementation of ‘maxval’ elements
• Same interfaces with different implementation of 5 data structures
  • Arrays
  • Simple lists
  • Binary search tree(list)
  • Bit vectors
  • Bins (buckets)
• Experiments 5 implementation with proper ‘maxval’ and ‘m’ values
  • Time complexity – elapsed time to create m-elements set
  • Space complexity – spaces required to create same set
• Refine implementation to get reasonable performance result
  • Performance rank in terms of TIME and SPACE

Interface

• IntSet as set of integers

  • IntSetxxx: xxx as a qualifier
  • IntSetArr, IntSetList, IntSetBST, IntSetBitVec, IntSetBins

• intSetImp(int maxelems, int maxval)

  • initializes the set to empty
  • maxelems: maximum number of elements
  • maxval: maximum value of any element

• insert(int element)

  • adds a new integer to the set, if it is not already present

• size()

  • tells the current number of elements

• report(int *v)

  • returns elements in sorted order

A C++ code

• An example code to generate a sorted set of random integers

void gensets(int m, int maxval)

{ int *v = new int[m];

  IntSetImp S(m, maxval);

  while (S.size() < m)

	    S.insert(bigrand() % maxval);
    
  S.report(v);

for (int i = 0; i < m; i++)

  cout << v[i] << "\n";

}

Performance tuning

• maxval = n = 〖10〗^8 , 〖10〗^6

• maxelements: m = n/100, n/50, n/25

• Set generation experiments measured for 5 cases excluding i/o

  • Time elapsed
    • initialize / insert / report / Total
  • Total space required
    • for SET implementation

• Improve performance

  • Implementation and measure
  • Performance upgrade iterations

EX: code for bit vector

class IntSetBitVec {

private:

enum { BITSPERWORD = 32, SHIFT = 5, MASK = 0x1F };

int n, hi, *x;

void set(int i) { x[i>>SHIFT] |= (1<<(i & MASK)); }

void clr(int i) { x[i>>SHIFT] &= ~(1<<(i & MASK)); }

int test(int i) { return x[i>>SHIFT] & (i<<(i & MASK)); }

public:

IntSetBitVec(maxelements, maxval)

{ hi = maxval;

  x = new int[1 + hi/BITSPERWORD];

  for (int i = 0; i < hi; i++)

	  clr(i);

   n = 0;

}

int size() { return n; }

void insert(t)

{ if (test(t))

	return;

set(t);

n++;

}

void report(int *v)

{ j = 0

for (int i = 0; i < hi; i++)

	if test(i)

		v[j++] = i

}

};