I'm running render_list to push my setup to the limit and see what changes
improves the render time.
Two VMs in the same KVM, one running Postgis and the other
mod_tile+renderd+mapnik.
Ubuntu 13.10, Mapnik nightly 2.3 ppa, mod_tile from github just a day ago.
PostgresSQL has 100 max connections
Renderd is capped to 16 threads and the VM has 18 cores.
I'm running a large number (20-40) of render_list processed with -n 1 each
The mod_tile-VM renderd process is rock steady at 790-798% CPU, so something
must be capped to 8 threads, presumably on that VM, but what could it be?
root@modtile2:~# cat /etc/renderd.conf
[renderd]
num_threads=16
...
karl
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