Is it possible (now) to prepare CH graph concurrently? As far as I know from the source code it is not – only for multiple weights, and that is managed by setting prepare.ch.threads parameter, but the single weight is still prepared in the single thread.
No currently nothing like this is implemented, see also here: https://github.com/graphhopper/graphhopper/issues/1565#issuecomment-527851297
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Thank you very much
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