Added a method to cap the size of the cache in DijkstraShortestPaths and DijkstraDistance #80
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…nd DijkstraDistance, which allows it to run on large graph continuously without GC or memory issues
tomnelson
reviewed
Nov 21, 2017
| protected Hypergraph<V,E> g; | ||
| protected Function<? super E,? extends Number> nev; | ||
| protected Map<V,SourceData> sourceMap; // a map of source vertices to an instance of SourceData | ||
| protected LinkedHashMap<V,SourceData> sourceMap; // a map of source vertices to an instance of SourceData |
Contributor
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Sorry if I missed a discussion of this, but is the cost (of a possible virtual lookup when declaring as the most general type) really a factor with modern JVMs?
Contributor
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If it is a factor on modern JVMs, I've personally not heard of it. :/
IIRC, it's more idiomatic to keep the base type here as Map, i.e. whatever interface is most generic, or as high up the type hierarchy as possible, that has all the methods one needs.
Just my 2 cents.
Contributor
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Was there ever a plan to merge this? |
Owner
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It's on my list of things to look at before the 3.0 release. Haven't gotten to it yet. |
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This is a proof of concept to show the benefit of implementing a cap on the size of the cache.
It allows the user to perform a large number of shortest path calculations on large graph, continuously without GC or memory issues, when they are memory constrained in the VM.
See the new test cases TestCachingLargeGraph for an example.
Tested with VM options: -Xms128m-Xmx750m