On Saturday, April 11, 2015 at 9:29:27 AM UTC+1, [email protected] wrote:
>
>
>
>      :-(    GCS is about half the speed of using the local FS.  See the 
> table below.
>

Actually it's even worse than the table implied, because I'd failed to 
notice that the test path that goes over open water between two islands 
(where therefore part of the path had no tiles),  had thrown an error in 
the GCS version.  When I corrected the exception trapped, the time for 
processing this path was anything between about 35 - 55 seconds!  Perhaps 
it would be possible to reduce this significantly by fiddling about with 
the retry parameters, but there seems little point in experimenting further 
when the result is still going to be slower anyway.

Incidentally, I got around the original upload problem by deleting the OSLP 
folder from the previous version, updating it, then adding the OSLP folder 
to the new version, and updating again.  It was a tiresome bore, and you 
couldn't do it with a serious app that had to remain live at all times, but 
as this is a only intended to be a demo, it was an acceptable workaround.

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