Hi, this is for two reasons: first, it allows you to use the MMap for server side second, it allows us to use multi-threaded algorithms at some point in the future
Regards, Peter On 01.07.2015 02:31, John Zhao wrote: > Hi Peter, > > This question is for you. :) > > I guess MMapDataAccess is mainly designed for running Graphhopper on > Android device, which you can't load all the data into the limited memory. > > In the comment of MMapDataAccess: > This is a data structure which uses the operating system to > synchronize between disc and memory. > Use SynchDAWrapper if you intent to use this from multiple threads! > > why GH need a thread-safe one, somebody want to do the extract on > Android device? > just curious. > > Thanks in advance. > > *Best Regards,* > *ZhiQiang ZHAO* > > > _______________________________________________ > GraphHopper mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/graphhopper
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