_Also_:
* Use `mapnik::freetype_engine::register_fonts` in `gen_tile.cpp` rather than recursing manually
* Available since `Mapnik` v2 which is no longer supported
`renderd` coverage is otherwise not properly reported
_Also:_
- Removed `freebsd12` from CI
- Packages are no longer provided (http://pkg.freebsd.org/)
- Added test for `HTCP host name` specification
- Renamed files in `src`/`includes` to match target names
- `src/daemon.c` → `src/renderd.c`
- `src/speedtest.cpp` →`src/render_speedtest.cpp`
- `includes/daemon.h` → `includes/renderd.h`
sets the new MaxLoadMissing to 50 and MaxLoadOld to 16.
With the prevalence of multi core servers today, the previous
default thresholds of 10 and 5 were becoming to lower than the average
CPU count. Furthermore, load is not an ideal measure, as it includes I/O
load and much of the I/O load might well come from serving rather than
rendering. Especially if the database is on a separate SSD. Lastly, using
the thresholds in mod_tile isn't super helpful, as due to hysteresis of
rendering queues stop submitting tiles at a time of high load is not
particularly helpful without stopping rendering from the queue.
In addition to Render and RenderPrio, add another priority level of RenderLow.
The idea is that if you rerender all tiles by touching planet-import-complete and
thereby likely overloading the server's rendering capacity you want to prioritize rerendering
of tiles that were explicitly marked dirty due to data changes over rerendering
due to planet-import-complete updates.
This is achieved by splitting rendering requests by if they are "old", or "very old".
As the tile expiry sets back the modification date many years, mod_tile splits
rendering requests based on how old the tiles are. If they are no more than a
certain threshold (currently set to one year) old, they are rendered with lower priority.
