[Graphhopper] start and final routing point

[jotpe]

Hello Peter,

my server is an old HP one with 5B RAM DualCore. I tried to get OSRM
running with the germany osm file from geofabrik.de. But finally it failed.
I created the routing index files on an amazon instance, which needed max
between 10 and 11 GB RAM. The osrm-routed program just needs 3,9 GB RAM, so
i tried to run it on my old hardware. Normally it should be enough, but the
start process was killed with an alloc error. The swap partition was not
used or ignored. Very strange.

So i tried the graphhopper. Indexing the same extract file needs something
between 1 and 2 GB Ram, during runtime just 1GB, so it fullfilled my
requirements. One recordset could be calculated in 0,033 seconds,
while parallelisation
reduces the runtime about 1/n.

Greeting Johannes
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