Dane Springmeyer wrote:
Part of the problem may be that renderd uses a new instance
per style per rendering thread.
Yes, this certainly uses more memory, but it is an intended feature AFAIK.
The mapnik.Map object is not (by design) intended to shared between threads.
If renderd is able to only read the map after initialization (ie. work with a const mapnik::Map&) there should be little problem with sharing between threads.