[Tile-serving] [openstreetmap/mod_tile] render_list multi threading is not working, it seems (Issue #405)

[Prem]

Thanks for the reply @hummeltech 

Although I had made al suggested changes and kicked off the command for zooms 15 to 19. However, the process could not complete for 15th zoom level even after 2days of continuous process consuming most of the resources. 

**Postgres Database configuration:**
**shared_buffers = 200GB
work_mem = 10GB
maintenance_work_mem = 40GB
effective_cache_size = 40GB
max_connections = 100**

**Ubuntu machine with 350GB RAM, 46 threads and TBs of SSD storage**

For your `renderd.conf`

```
[renderd]
stats_file=/run/renderd/renderd.stats
socketname=/run/renderd/renderd.sock
num_threads=40
tile_dir=/data/tile_cache/osm
```

rendered_list command being executed is:
`render_list --all --map default --min-zoom 15 --max-zoom 19 --num-threads 40 --max-load 40`

![image](https://github.com/openstreetmap/mod_tile/assets/10497161/4b4d0ef9-40ad-4629-9a77-911a4fb510b0)

Crossed 2days of processing time, still 15th zoom level in-progress.

Any rough estimates of how much time ideally render_list command takes to process all the zoom levels from 0-19 with the above configuration?? Is it expected to see this behaviour of unending process or am I missing something?

-Prem

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