[openstreetmap/openstreetmap-website] Document the non-db quadtile functions in the installation notes (#1313)

Andy Allan notifications at github.com
Thu Oct 6 13:58:24 UTC 2016

While debugging why a single controller test was taking over 30 seconds to run, I found out about the non-database quad_tile functions (the database ones are already well documented).

These are implemented in ruby in `lib/quad_tile.rb`, but there is also a C-based implementation in the `lib/quad_tile/` directory. The test suite passes if you don't have the C-based version compiled, since the ruby code is used instead, but you can speed up the entire test suite (on my machine, by 40 seconds per run or ~20%) by compiling them.

The only other documentation that I've found is in the chef code for the deployed version:


>From that, instructions would appear to be straightforward:

cd lib/quad_tile
ruby extconf.rb

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