One-to-many requests

Open Source Routing Engine
1

Hi,
What’s the exact status of one-to-many with the different routing engines? I was a PR for matrix api from last year but that seems to have died a death over the issue of the web interface. Can it be resurrected? What about the new hybrid?
Thanks
Tim

2

What do you mean with different routing engines? Do you mean different algorithms?

I was a PR for matrix api from last year but that seems to have died a death over the issue of the web interface.

The original poster of the PR obviously lost time and/or interests. The new hybrid algorithm is not optimal to solve these problems as it is goal directed, but it is possible probably the speed up compared to single point-to-point requests is not that big.

3

Hi. Thanks for the quick response. Yes algorithms. We’ll test on multiple
point-to-point. We’re typically after m x n where m << n so it may well be
fast enough.

4

Hi, I’m running into confusion here, I’m afraid. I built the map with ch.enable=false. I then try to run from the java api, from UK OSM map having set file names for importOrLoad

I can do this:
new GHRequest(target(List(from, to)))
.setWeighting(“fastest”)
.setVehicle(“car”)
.setAlgorithm(Parameters.Algorithms.ASTAR_BI);

and my 200 one-to-one take approximately 50 seconds
Or I can leave out the setAlgorithm flag altogether in which case the time is still about the same.
But how do I set it to use hybrid mode? I know it did map prep because it talked about “landmarks” during the build process. But there isn’t an obvious string constant for setAlgorithm( ) and using “hybrid” fails telling me there’s no route so fails on getBest

5

tracing around the code, it looks like you do something in the GraphHopperModule to set it up but I’m using java api
Is that the case?
Thanks