Searching for transfer rules is slow

[mattwigway]

Searching for transfer rules in RaptorWorkerTimetable::getFrequencyDeparture is close to 70% of runtime on pure-frequency networks. Looks like this is largely due to stream creation.

[abyrd]

Does this optimization significantly improve runtime? If so, then we have to rethink using Java 8 features.

[mattwigway]

Yes, at least when the lists are empty, not constructing the empty streams saves several seconds per request.

Matthew Wigginton Conway
Transportation Analytics/Open Source
Washington, DC
indicatrix.org

---- On Mon, 03 Aug 2015 19:01:06 -0400 Andrew Byrd <notifications@github.com> wrote ----

Does this optimization significantly improve runtime? If so, then we have to rethink using Java 8 features.
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[mattwigway]

I should add that this function is called millions of times per request and usually does nothing. This is a particular use case (constructing lots of empty streams) that probably isn't common.