2010-07-09 05:05:40 -04:00
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FAQ
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Q: What platforms does OSMR run on?
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A: Virtually any Unix-like platform with g++ installed. It has been developed
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under Linux and tested on MacOS X 10.6. It should run under Windows as well
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though the code will need some adjustments.
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Q: What is the workflow to get the engine up and running
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A: Road network extraction->Preprocessing->Startup
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Q: What does OSRM stand for?
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A: It is an abbreviation for Open Source Routing Machine.
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Q: What does HSGR stand for?
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A: It is an abbreviation for Hierarchy Search GRaph.
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Q: What is the .nodes file?
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A: It is a map that translates between internal and external Node IDs. Remember
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that external NodeIDs can be arbitrary and non-contigous. Internally the
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nodes are numbered from 0 to n-1.
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Q: The routing engine crashes with a seg-fault
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A: Check the startup parameters.
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Q: Something about the route is odd. I know that there is a better path
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A: Most probably it is missing data in the OSM file.
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Q: I work for this company that would like to use the code, but we are hesistant
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because of the license.
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A: Contact me. Probably, we can work something out.
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Q: How fast is this thing?
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A: Good question. Here is a number. The engine was able to handle more than
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2800 requests per Minute on the German road network with the travel time
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metric on a Core 2 Duo. This also includes transfer of data across a
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2010-07-15 10:45:43 -04:00
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switched 100MBit/s LAN. So, I guess it's fair to say it's fast.
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Q: What is the difference between extractNetwork and extractLargeNetwork?
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A: extractNetwork does all of its magic in RAM, while extractLargeNetwork uses the
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stxxl library to store the data in external memory. Use the first one for small
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networks, but beware of running out of RAM. Swapping is the kiss of death. For
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larger networks use extractLargeNetwork. It will be somewhat slower on the
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smaller files, but way faster with large ones like the planet file.
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