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Use a flat vector instead of a map in FlowEdgeIterator.

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This reduced the cost of Dijkstra<CapacityAnnotation> by approx. 25%,
in a test profiling.
This commit is contained in:
Jonathan G Rennison 2015-11-26 18:23:10 +00:00
parent a3768d3a29
commit 0fb79a8f15
1 changed files with 6 additions and 2 deletions
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8
src/linkgraph/mcf.cpp
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@ -136,7 +136,7 @@ private:
LinkGraphJob &job; ///< Link graph job we're working with.
/** Lookup table for getting NodeIDs from StationIDs. */
std::map<StationID, NodeID> station_to_node;
std::vector<NodeID> station_to_node;
/** Current iterator in the shares map. */
FlowStat::SharesMap::const_iterator it;
@ -152,7 +152,11 @@ public:
FlowEdgeIterator(LinkGraphJob &job) : job(job)
{
for (NodeID i = 0; i < job.Size(); ++i) {
this->station_to_node[job[i].Station()] = i;
StationID st = job[i].Station();
if (st >= this->station_to_node.size()) {
this->station_to_node.resize(st + 1);
}
this->station_to_node[st] = i;
}
}