Open-Harbor/osrm-backend
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases 3 Wiki Activity

Use ArrayStorage for boundary nodes to optimize MLD

Browse Source 
For the MLD algorithm we can partition the NodeID range into boundary
and non-boundary nodes. Since there are only we boundary nodes we can
use the ArrayStorage for those yielding much faster query times.
This commit is contained in:
Patrick Niklaus
2018-04-08 16:37:08 +00:00
committed by Patrick Niklaus
parent 7edf0f218c
commit bf2b45120a
12 changed files with 151 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/engine/routing_algorithms/alternative_path_mld.cpp
+2 -1
View File
@@ -700,7 +700,8 @@ InternalManyRoutesResult alternativePathSearch(SearchEngineData<Algorithm> &sear
const Partition &partition = facade.GetMultiLevelPartition();
// Prepare heaps for usage below. The searches will modify them in-place.
search_engine_data.InitializeOrClearFirstThreadLocalStorage(facade.GetNumberOfNodes());
search_engine_data.InitializeOrClearFirstThreadLocalStorage(facade.GetNumberOfNodes(),
facade.GetMaxBorderNodeID() + 1);
Heap &forward_heap = *search_engine_data.forward_heap_1;
Heap &reverse_heap = *search_engine_data.reverse_heap_1;
src/engine/routing_algorithms/direct_shortest_path.cpp
+2 -1
View File
@@ -69,7 +69,8 @@ InternalRouteResult directShortestPathSearch(SearchEngineData<mld::Algorithm> &e
const DataFacade<mld::Algorithm> &facade,
const PhantomNodes &phantom_nodes)
{
engine_working_data.InitializeOrClearFirstThreadLocalStorage(facade.GetNumberOfNodes());
engine_working_data.InitializeOrClearFirstThreadLocalStorage(facade.GetNumberOfNodes(),
facade.GetMaxBorderNodeID() + 1);
auto &forward_heap = *engine_working_data.forward_heap_1;
auto &reverse_heap = *engine_working_data.reverse_heap_1;
insertNodesInHeaps(forward_heap, reverse_heap, phantom_nodes);
src/engine/routing_algorithms/many_to_many_mld.cpp
+4 -3
View File
@@ -258,7 +258,8 @@ std::vector<EdgeDuration> oneToManySearch(SearchEngineData<Algorithm> &engine_wo
}
// Initialize query heap
engine_working_data.InitializeOrClearManyToManyThreadLocalStorage(facade.GetNumberOfNodes());
engine_working_data.InitializeOrClearManyToManyThreadLocalStorage(
facade.GetNumberOfNodes(), facade.GetMaxBorderNodeID() + 1);
auto &query_heap = *(engine_working_data.many_to_many_heap);
// Check if node is in the destinations list and update weights/durations
@@ -465,7 +466,7 @@ std::vector<EdgeDuration> manyToManySearch(SearchEngineData<Algorithm> &engine_w
const auto &phantom = phantom_nodes[index];
engine_working_data.InitializeOrClearManyToManyThreadLocalStorage(
facade.GetNumberOfNodes());
facade.GetNumberOfNodes(), facade.GetMaxBorderNodeID() + 1);
auto &query_heap = *(engine_working_data.many_to_many_heap);
if (DIRECTION == FORWARD_DIRECTION)
@@ -492,7 +493,7 @@ std::vector<EdgeDuration> manyToManySearch(SearchEngineData<Algorithm> &engine_w
// Clear heap and insert source nodes
engine_working_data.InitializeOrClearManyToManyThreadLocalStorage(
facade.GetNumberOfNodes());
facade.GetNumberOfNodes(), facade.GetMaxBorderNodeID() + 1);
auto &query_heap = *(engine_working_data.many_to_many_heap);
if (DIRECTION == FORWARD_DIRECTION)
src/engine/routing_algorithms/map_matching.cpp
+20 -3
View File
@@ -46,6 +46,25 @@ unsigned getMedianSampleTime(const std::vector<unsigned> &timestamps)
std::nth_element(first_elem, median, sample_times.end());
return *median;
}
template <typename Algorithm>
inline void initializeHeap(SearchEngineData<Algorithm> &engine_working_data,
const DataFacade<Algorithm> &facade)
{
const auto nodes_number = facade.GetNumberOfNodes();
engine_working_data.InitializeOrClearFirstThreadLocalStorage(nodes_number);
}
template <>
inline void initializeHeap<mld::Algorithm>(SearchEngineData<mld::Algorithm> &engine_working_data,
const DataFacade<mld::Algorithm> &facade)
{
const auto nodes_number = facade.GetNumberOfNodes();
const auto border_nodes_number = facade.GetMaxBorderNodeID() + 1;
engine_working_data.InitializeOrClearFirstThreadLocalStorage(nodes_number, border_nodes_number);
}
}
template <typename Algorithm>
@@ -131,9 +150,7 @@ SubMatchingList mapMatching(SearchEngineData<Algorithm> &engine_working_data,
return sub_matchings;
}
const auto nodes_number = facade.GetNumberOfNodes();
engine_working_data.InitializeOrClearFirstThreadLocalStorage(nodes_number);
initializeHeap(engine_working_data, facade);
auto &forward_heap = *engine_working_data.forward_heap_1;
auto &reverse_heap = *engine_working_data.reverse_heap_1;