source: lemon-0.x/benchmark/bfs-bench.cc @ 1799:990ef198f64d

// -*- mode:C++ -*-

#include<queue>
#include<cmath>
#include<lemon/smart_graph.h>
#include"bench_tools.h"

using namespace std;
using namespace lemon;

inline int numOfOnes(int n,int dim)
{
  int s=0;
  for(int i=0;i<dim;i++) {
    s+=n%2;
    n>>=1;
  }
  return s;
}

inline int numOfZeros(int n,int dim)
{
  int s=dim;
  for(int i=0;i<dim;i++) {
    s-=n&1;
    n>>=1;
  }
  return s;
}

template<class Graph>
void bfsStlQueue(Graph &G,typename Graph::Node source)
{
  GRAPH_TYPEDEFS(typename Graph);

  using namespace std;
  
  typename Graph::template NodeMap<bool> visited(G,false);
    
  queue<typename Graph::Node> Q;
    
  Q.push(source);
  visited[source]=true;
  do {
    Node n(Q.front());
    Node m;
    Q.pop();
    for(OutEdgeIt e(G,n);e!=INVALID;++e)
      if(!visited[m=G.target(e)]) {
        Q.push(m);
        visited.set(m,true);
      }
  } while(!Q.empty());
}

template<class Graph>
void bfsOwnQueue(Graph &G,typename Graph::Node source)
{
  GRAPH_TYPEDEFS(typename Graph);

  using namespace std;
  
  typename Graph::template NodeMap<bool> visited(G,false);
  
  int N=G.nodeNum();
  vector<typename Graph::Node> Q(N);
  int Qh=0;
  int Qt=0;
  

  Q[Qh++]=source;
  visited.set(source,true);
  do {
    Node m;
    Node n=Q[Qt++];
    for(OutEdgeIt e(G,n);e!=INVALID;++e)
      if(!visited[m=G.target(e)]) {
        Q[Qh++]=m;
        visited.set(m,true);
      }
  } while(Qt!=Qh);
}

template<class Graph>
void iteratorBench(Graph &G)
{
  GRAPH_TYPEDEFS(typename Graph);

  int i=0;
  
  for(NodeIt n(G);n!=INVALID;++n)
    for(OutEdgeIt e(G,n);e!=INVALID;++e)
      i++;
}

int main(int argc, char *argv[])
{
  typedef SmartGraph Graph;

  GRAPH_TYPEDEFS(Graph);

  Graph G;
  
  Timer T;
  
  if(argc!=3) {
    cout << "Usage: " << argv[0] << " dim mul\n";
    return 1;
  }
  
  int dim=atoi(argv[1]);
  int mul=atoi(argv[2]);
  
//   cout << "Creating Hipercube ("<< (1<<dim) << " nodes, "
//        << dim*(1<<dim) << " edges):";

  T.reset();
  vector<Node> nodes;
  addBiDirHyperCube(G,dim,nodes);

  PrintTime("GENGRAPH",T);

  T.reset();
  {
    for(int i=0;i<mul;i++)
      bfsStlQueue(G,nodes[0]);
  }
  PrintTime("BFS-STL",T);
  T.reset();
  {
    for(int i=0;i<mul;i++)
      bfsOwnQueue(G,nodes[0]);
  }
  PrintTime("BFS-OWN",T);
  T.reset();
  {
    for(int i=0;i<mul;i++)
      iteratorBench(G);
  }
  PrintTime("ITERATE",T);


}