parallel-compile-time.cpp
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//=======================================================================
// Copyright 2001 Jeremy G. Siek, Andrew Lumsdaine, Lie-Quan Lee,
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//=======================================================================
#include <boost/config.hpp>
#include <fstream>
#include <iostream>
#include <numeric>
#include <string>
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/graph_utility.hpp>
#include <boost/graph/property_iter_range.hpp>
#include <boost/graph/depth_first_search.hpp> // for default_dfs_visitor
namespace std
{
template < typename T >
std::istream& operator>>(std::istream& in, std::pair< T, T >& p)
{
in >> p.first >> p.second;
return in;
}
}
namespace boost
{
enum vertex_compile_cost_t
{
vertex_compile_cost
};
BOOST_INSTALL_PROPERTY(vertex, compile_cost);
}
using namespace boost;
typedef adjacency_list< listS, // Store out-edges of each vertex in a std::list
listS, // Store vertex set in a std::list
directedS, // The file dependency graph is directed
// vertex properties
property< vertex_name_t, std::string,
property< vertex_compile_cost_t, float,
property< vertex_distance_t, float,
property< vertex_color_t, default_color_type > > > >,
// an edge property
property< edge_weight_t, float > >
file_dep_graph2;
typedef graph_traits< file_dep_graph2 >::vertex_descriptor vertex_t;
typedef graph_traits< file_dep_graph2 >::edge_descriptor edge_t;
template < typename Graph, typename ColorMap, typename Visitor >
void dfs_v2(const Graph& g, typename graph_traits< Graph >::vertex_descriptor u,
ColorMap color, Visitor vis)
{
typedef typename property_traits< ColorMap >::value_type color_type;
typedef color_traits< color_type > ColorT;
color[u] = ColorT::gray();
vis.discover_vertex(u, g);
typename graph_traits< Graph >::out_edge_iterator ei, ei_end;
for (boost::tie(ei, ei_end) = out_edges(u, g); ei != ei_end; ++ei)
if (color[target(*ei, g)] == ColorT::white())
{
vis.tree_edge(*ei, g);
dfs_v2(g, target(*ei, g), color, vis);
}
else if (color[target(*ei, g)] == ColorT::gray())
vis.back_edge(*ei, g);
else
vis.forward_or_cross_edge(*ei, g);
color[u] = ColorT::black();
vis.finish_vertex(u, g);
}
template < typename Graph, typename Visitor, typename ColorMap >
void generic_dfs_v2(const Graph& g, Visitor vis, ColorMap color)
{
typedef typename property_traits< ColorMap >::value_type ColorValue;
typedef color_traits< ColorValue > ColorT;
typename graph_traits< Graph >::vertex_iterator vi, vi_end;
for (boost::tie(vi, vi_end) = vertices(g); vi != vi_end; ++vi)
color[*vi] = ColorT::white();
for (boost::tie(vi, vi_end) = vertices(g); vi != vi_end; ++vi)
if (color[*vi] == ColorT::white())
dfs_v2(g, *vi, color, vis);
}
template < typename OutputIterator >
struct topo_visitor : public default_dfs_visitor
{
topo_visitor(OutputIterator& order) : topo_order(order) {}
template < typename Graph >
void finish_vertex(
typename graph_traits< Graph >::vertex_descriptor u, const Graph&)
{
*topo_order++ = u;
}
OutputIterator& topo_order;
};
template < typename Graph, typename OutputIterator, typename ColorMap >
void topo_sort(const Graph& g, OutputIterator topo_order, ColorMap color)
{
topo_visitor< OutputIterator > vis(topo_order);
generic_dfs_v2(g, vis, color);
}
typedef property_map< file_dep_graph2, vertex_name_t >::type name_map_t;
typedef property_map< file_dep_graph2, vertex_compile_cost_t >::type
compile_cost_map_t;
typedef property_map< file_dep_graph2, vertex_distance_t >::type distance_map_t;
typedef property_map< file_dep_graph2, vertex_color_t >::type color_map_t;
int main(int argc, const char** argv)
{
std::ifstream file_in(argc >= 2 ? argv[1] : "makefile-dependencies.dat");
typedef graph_traits< file_dep_graph2 >::vertices_size_type size_type;
size_type n_vertices;
file_in >> n_vertices; // read in number of vertices
std::istream_iterator< std::pair< size_type, size_type > > input_begin(
file_in),
input_end;
#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300
// VC++ can't handle the iterator constructor
file_dep_graph2 g;
typedef graph_traits< file_dep_graph2 >::vertex_descriptor vertex_t;
std::vector< vertex_t > id2vertex;
for (std::size_t v = 0; v < n_vertices; ++v)
id2vertex.push_back(add_vertex(g));
while (input_begin != input_end)
{
size_type i, j;
boost::tie(i, j) = *input_begin++;
add_edge(id2vertex[i], id2vertex[j], g);
}
#else
file_dep_graph2 g(input_begin, input_end, n_vertices);
#endif
name_map_t name_map = get(vertex_name, g);
compile_cost_map_t compile_cost_map = get(vertex_compile_cost, g);
distance_map_t distance_map = get(vertex_distance, g);
color_map_t color_map = get(vertex_color, g);
{
std::ifstream name_in(
argc >= 3 ? argv[2] : "makefile-target-names.dat");
std::ifstream compile_cost_in(
argc >= 4 ? argv[3] : "target-compile-costs.dat");
graph_traits< file_dep_graph2 >::vertex_iterator vi, vi_end;
for (boost::tie(vi, vi_end) = vertices(g); vi != vi_end; ++vi)
{
name_in >> name_map[*vi];
compile_cost_in >> compile_cost_map[*vi];
}
}
std::vector< vertex_t > topo_order(num_vertices(g));
topo_sort(g, topo_order.rbegin(), color_map);
graph_traits< file_dep_graph2 >::vertex_iterator i, i_end;
graph_traits< file_dep_graph2 >::adjacency_iterator vi, vi_end;
// find source vertices with zero in-degree by marking all vertices with
// incoming edges
for (boost::tie(i, i_end) = vertices(g); i != i_end; ++i)
color_map[*i] = white_color;
for (boost::tie(i, i_end) = vertices(g); i != i_end; ++i)
for (boost::tie(vi, vi_end) = adjacent_vertices(*i, g); vi != vi_end;
++vi)
color_map[*vi] = black_color;
// initialize distances to zero, or for source vertices, to the compile cost
for (boost::tie(i, i_end) = vertices(g); i != i_end; ++i)
if (color_map[*i] == white_color)
distance_map[*i] = compile_cost_map[*i];
else
distance_map[*i] = 0;
std::vector< vertex_t >::iterator ui;
for (ui = topo_order.begin(); ui != topo_order.end(); ++ui)
{
vertex_t u = *ui;
for (boost::tie(vi, vi_end) = adjacent_vertices(u, g); vi != vi_end;
++vi)
if (distance_map[*vi] < distance_map[u] + compile_cost_map[*vi])
distance_map[*vi] = distance_map[u] + compile_cost_map[*vi];
}
graph_property_iter_range< file_dep_graph2, vertex_distance_t >::iterator
ci,
ci_end;
boost::tie(ci, ci_end) = get_property_iter_range(g, vertex_distance);
std::cout << "total (parallel) compile time: "
<< *std::max_element(ci, ci_end) << std::endl;
return 0;
}