Initial version of core ch

This improves preprocessing times in favour of worse query performance.
Core size can be set over the --core parameater, default is the old
behaviour to fully contract the graph.

contractor/contractor.hpp

@@ -284,7 +284,7 @@ class Contractor
 
     ~Contractor() {}
 
-    void Run()
+    void Run( double core_factor = 1.0 )
     {
         // for the preperation we can use a big grain size, which is much faster (probably cache)
         constexpr size_t InitGrainSize = 100000;
@@ -333,9 +333,9 @@ class Contractor
                   << std::flush;
 
         bool flushed_contractor = false;
-        while (number_of_nodes > 2 && number_of_contracted_nodes < number_of_nodes)
+        while (number_of_nodes > 2 && number_of_contracted_nodes < static_cast<NodeID>(number_of_nodes * core_factor) )
         {
-            if (!flushed_contractor && (number_of_contracted_nodes > (number_of_nodes * 0.65)))
+            if (!flushed_contractor && (number_of_contracted_nodes > static_cast<NodeID>(number_of_nodes * 0.65 * core_factor)))
             {
                 DeallocatingVector<ContractorEdge> new_edge_set; // this one is not explicitely
                                                                  // cleared since it goes out of
@@ -524,7 +524,7 @@ class Contractor
             //            unsigned quaddegree = 0;
             //
             //            for(unsigned i = 0; i < remaining_nodes.size(); ++i) {
-            //                unsigned degree = contractor_graph->EndEdges(remaining_nodes[i].first)
+            //                unsigned degree = contractor_graph->EndEdges(remaining_nodes[i].id)
             //                -
             //                contractor_graph->BeginEdges(remaining_nodes[i].first);
             //                if(degree > maxdegree)
@@ -546,6 +546,8 @@ class Contractor
             p.printStatus(number_of_contracted_nodes);
         }
 
+        SimpleLogger().Write() << "[core] " << remaining_nodes.size() << " nodes " << contractor_graph->GetNumberOfEdges() << " edges." << std::endl;
+
         thread_data_list.data.clear();
     }
 

contractor/contractor_options.cpp

@@ -56,7 +56,11 @@ ContractorOptions::ParseArguments(int argc, char *argv[], ContractorConfig &cont
         "Path to LUA routing profile")(
         "threads,t", boost::program_options::value<unsigned int>(&contractor_config.requested_num_threads)
                          ->default_value(tbb::task_scheduler_init::default_num_threads()),
-        "Number of threads to use");
+        "Number of threads to use")(
+		"core,k", boost::program_options::value<double>(&contractor_config.core_factor)
+						 ->default_value(1.0),"Percentage of the graph (in vertices) to contract [0.1]");
+
+
 
     // hidden options, will be allowed both on command line and in config file, but will not be
     // shown to the user

contractor/contractor_options.hpp

@@ -56,6 +56,12 @@ struct ContractorConfig
     std::string rtree_leafs_output_path;
 
     unsigned requested_num_threads;
+
+    //A percentage of vertices that will be contracted for the hierarchy.
+    //Offers a trade-off between preprocessing and query time.
+    //The remaining vertices form the core of the hierarchy 
+    //(e.g. 0.8 contracts 80 percent of the hierarchy, leaving a core of 20%)
+    double core_factor;
 };
 
 struct ContractorOptions

contractor/processing_chain.cpp

@@ -414,7 +414,7 @@ void Prepare::ContractGraph(const unsigned max_edge_id,
                             DeallocatingVector<QueryEdge>& contracted_edge_list)
 {
     Contractor contractor(max_edge_id + 1, edge_based_edge_list);
-    contractor.Run();
+    contractor.Run(config.core_factor);
     contractor.GetEdges(contracted_edge_list);
 }
 

data_structures/binary_heap.hpp

@@ -189,6 +189,11 @@ class BinaryHeap
         return inserted_nodes[heap[1].index].node;
     }
 
+    Weight MinKey() const {
+      BOOST_ASSERT(heap.size() > 1);
+      return heap[1].weight;
+    }
+
     NodeID DeleteMin()
     {
         BOOST_ASSERT(heap.size() > 1);

data_structures/search_engine.hpp

@@ -33,6 +33,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "../routing_algorithms/many_to_many.hpp"
 #include "../routing_algorithms/map_matching.hpp"
 #include "../routing_algorithms/shortest_path.hpp"
+#include "../routing_algorithms/direct_shortest_path.hpp"
 
 #include <type_traits>
 
@@ -44,6 +45,7 @@ template <class DataFacadeT> class SearchEngine
 
   public:
     ShortestPathRouting<DataFacadeT> shortest_path;
+    DirectShortestPathRouting<DataFacadeT> direct_shortest_path;
     AlternativeRouting<DataFacadeT> alternative_path;
     ManyToManyRouting<DataFacadeT> distance_table;
     MapMatching<DataFacadeT> map_matching;
@@ -51,6 +53,7 @@ template <class DataFacadeT> class SearchEngine
     explicit SearchEngine(DataFacadeT *facade)
         : facade(facade),
           shortest_path(facade, engine_working_data),
+          direct_shortest_path(facade, engine_working_data),
           alternative_path(facade, engine_working_data),
           distance_table(facade, engine_working_data),
           map_matching(facade, engine_working_data)

features/options/prepare/help.feature

@@ -16,7 +16,8 @@ Feature: osrm-prepare command line options: help
         And stdout should contain "--restrictions"
         And stdout should contain "--profile"
         And stdout should contain "--threads"
-        And stdout should contain 15 lines
+        And stdout should contain "--core"
+        And stdout should contain 17 lines
         And it should exit with code 1
 
     Scenario: osrm-prepare - Help, short
@@ -31,7 +32,8 @@ Feature: osrm-prepare command line options: help
         And stdout should contain "--restrictions"
         And stdout should contain "--profile"
         And stdout should contain "--threads"
-        And stdout should contain 15 lines
+        And stdout should contain "--core"
+        And stdout should contain 17 lines
         And it should exit with code 0
 
     Scenario: osrm-prepare - Help, long
@@ -46,5 +48,6 @@ Feature: osrm-prepare command line options: help
         And stdout should contain "--restrictions"
         And stdout should contain "--profile"
         And stdout should contain "--threads"
-        And stdout should contain 15 lines
+        And stdout should contain "--core"
+        And stdout should contain 17 lines
         And it should exit with code 0

plugins/viaroute.hpp

@@ -39,6 +39,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "../util/json_renderer.hpp"
 #include "../util/make_unique.hpp"
 #include "../util/simple_logger.hpp"
+#include "../util/timing_util.hpp"
 
 #include <osrm/json_container.hpp>
 
@@ -153,12 +154,20 @@ template <class DataFacadeT> class ViaRoutePlugin final : public BasePlugin
         };
         osrm::for_each_pair(phantom_node_pair_list, build_phantom_pairs);
 
-        if (route_parameters.alternate_route && 1 == raw_route.segment_end_coordinates.size())
+        if (1 == raw_route.segment_end_coordinates.size())
+        {
+            if (route_parameters.alternate_route)
             {
               search_engine_ptr->alternative_path(raw_route.segment_end_coordinates.front(),
                                                   raw_route);
             }
             else
+            {
+                search_engine_ptr->direct_shortest_path(raw_route.segment_end_coordinates,
+                                                        route_parameters.uturns, raw_route);
+            }
+        }
+        else
         {
             search_engine_ptr->shortest_path(raw_route.segment_end_coordinates,
                                              route_parameters.uturns, raw_route);

routing_algorithms/direct_shortest_path.hpp

@@ -0,0 +1,165 @@
+/*
+
+Copyright (c) 2015, Project OSRM contributors
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+Redistributions of source code must retain the above copyright notice, this list
+of conditions and the following disclaimer.
+Redistributions in binary form must reproduce the above copyright notice, this
+list of conditions and the following disclaimer in the documentation and/or
+other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+*/
+
+#ifndef DIRECT_SHORTEST_PATH_HPP
+#define DIRECT_SHORTEST_PATH_HPP
+
+#include <boost/assert.hpp>
+
+#include "routing_base.hpp"
+#include "../data_structures/search_engine_data.hpp"
+#include "../util/integer_range.hpp"
+#include "../util/timing_util.hpp"
+#include "../typedefs.h"
+
+/// This is a striped down version of the general shortest path algorithm.
+/// The general algorithm always computes two queries for each leg. This is only
+/// necessary in case of vias, where the directions of the start node is constrainted
+/// by the previous route.
+/// This variation is only an optimazation for graphs with slow queries, for example
+/// not fully contracted graphs.
+template <class DataFacadeT>
+class DirectShortestPathRouting final
+    : public BasicRoutingInterface<DataFacadeT, DirectShortestPathRouting<DataFacadeT>>
+{
+    using super = BasicRoutingInterface<DataFacadeT, DirectShortestPathRouting<DataFacadeT>>;
+    using QueryHeap = SearchEngineData::QueryHeap;
+    SearchEngineData &engine_working_data;
+
+  public:
+    DirectShortestPathRouting(DataFacadeT *facade, SearchEngineData &engine_working_data)
+        : super(facade), engine_working_data(engine_working_data)
+    {
+    }
+
+    ~DirectShortestPathRouting() {}
+
+    void operator()(const std::vector<PhantomNodes> &phantom_nodes_vector,
+                    const std::vector<bool> &uturn_indicators,
+                    InternalRouteResult &raw_route_data) const
+    {
+        engine_working_data.InitializeOrClearFirstThreadLocalStorage(
+            super::facade->GetNumberOfNodes());
+
+        QueryHeap &forward_heap = *(engine_working_data.forward_heap_1);
+        QueryHeap &reverse_heap = *(engine_working_data.reverse_heap_1);
+
+        // Get distance to next pair of target nodes.
+        BOOST_ASSERT_MSG(1 == phantom_nodes_vector.size(),
+                                         "Direct Shortest Path Query only accepts a single source and target pair. Multiple ones have been specified.");
+
+        const auto& phantom_node_pair = phantom_nodes_vector.front();
+
+        forward_heap.Clear();
+        reverse_heap.Clear();
+        int distance = INVALID_EDGE_WEIGHT;
+        NodeID middle = SPECIAL_NODEID;
+
+        const EdgeWeight min_edge_offset =
+            std::min(-phantom_node_pair.source_phantom.GetForwardWeightPlusOffset(),
+                     -phantom_node_pair.source_phantom.GetReverseWeightPlusOffset());
+
+        // insert new starting nodes into forward heap, adjusted by previous distances.
+        if (phantom_node_pair.source_phantom.forward_node_id != SPECIAL_NODEID)
+        {
+            forward_heap.Insert(
+                phantom_node_pair.source_phantom.forward_node_id,
+                -phantom_node_pair.source_phantom.GetForwardWeightPlusOffset(),
+                phantom_node_pair.source_phantom.forward_node_id);
+        }
+        if ( phantom_node_pair.source_phantom.reverse_node_id != SPECIAL_NODEID)
+        {
+            forward_heap.Insert(
+                phantom_node_pair.source_phantom.reverse_node_id,
+                -phantom_node_pair.source_phantom.GetReverseWeightPlusOffset(),
+                phantom_node_pair.source_phantom.reverse_node_id);
+        }
+
+        // insert new backward nodes into backward heap, unadjusted.
+        if (phantom_node_pair.target_phantom.forward_node_id != SPECIAL_NODEID)
+        {
+            reverse_heap.Insert(phantom_node_pair.target_phantom.forward_node_id,
+                                 phantom_node_pair.target_phantom.GetForwardWeightPlusOffset(),
+                                 phantom_node_pair.target_phantom.forward_node_id);
+        }
+
+        if (phantom_node_pair.target_phantom.reverse_node_id != SPECIAL_NODEID)
+        {
+            reverse_heap.Insert(phantom_node_pair.target_phantom.reverse_node_id,
+                                 phantom_node_pair.target_phantom.GetReverseWeightPlusOffset(),
+                                 phantom_node_pair.target_phantom.reverse_node_id);
+        }
+
+        // run two-Target Dijkstra routing step.
+        while (0 < (forward_heap.Size() + reverse_heap.Size()) )
+        {
+            if (!forward_heap.Empty())
+            {
+                super::RoutingStep(forward_heap, reverse_heap, &middle, &distance,
+                                   min_edge_offset, true);
+            }
+            if (!reverse_heap.Empty())
+            {
+                super::RoutingStep(reverse_heap, forward_heap, &middle, &distance,
+                                   min_edge_offset, false);
+            }
+        }
+
+        // No path found for both target nodes?
+        if ((INVALID_EDGE_WEIGHT == distance))
+        {
+            raw_route_data.shortest_path_length = INVALID_EDGE_WEIGHT;
+            raw_route_data.alternative_path_length = INVALID_EDGE_WEIGHT;
+            return;
+        }
+
+        // Was a paths over one of the forward/reverse nodes not found?
+        BOOST_ASSERT_MSG((SPECIAL_NODEID == middle || INVALID_EDGE_WEIGHT != distance),
+                         "no path found");
+
+        // Unpack paths if they exist
+        std::vector<NodeID> packed_leg;
+        if (INVALID_EDGE_WEIGHT != distance)
+        {
+            super::RetrievePackedPathFromHeap(forward_heap, reverse_heap, middle, packed_leg);
+
+            BOOST_ASSERT_MSG(!packed_leg.empty(), "packed path empty");
+
+            raw_route_data.unpacked_path_segments.resize(1);
+            raw_route_data.source_traversed_in_reverse.push_back(
+                (packed_leg.front() != phantom_node_pair.source_phantom.forward_node_id));
+            raw_route_data.target_traversed_in_reverse.push_back(
+                (packed_leg.back() != phantom_node_pair.target_phantom.forward_node_id));
+
+            super::UnpackPath(packed_leg, phantom_node_pair, raw_route_data.unpacked_path_segments.front());
+        }
+
+        raw_route_data.shortest_path_length = distance;
+    }
+};
+
+#endif /* DIRECT_SHORTEST_PATH_HPP */

unit_tests/data_structures/binary_heap.cpp

@@ -165,6 +165,7 @@ BOOST_FIXTURE_TEST_CASE_TEMPLATE(decrease_key_test, T, storage_types, RandomData
         {
             heap.DecreaseKey(id, weights[id]);
             BOOST_CHECK_EQUAL(heap.Min(), min_id);
+            BOOST_CHECK_EQUAL(heap.MinKey(), min_weight);
             weights[id]--;
         }
 
@@ -172,6 +173,7 @@ BOOST_FIXTURE_TEST_CASE_TEMPLATE(decrease_key_test, T, storage_types, RandomData
         weights[id] -= 2;
         heap.DecreaseKey(id, weights[id]);
         BOOST_CHECK_EQUAL(heap.Min(), id);
+        BOOST_CHECK_EQUAL(heap.MinKey(), weights[id]);
     }
 }