The last change built jemalloc with its background thread on, so that
freed pages go back to the kernel on time. jemalloc has that thread on
Linux only: on macOS every start of the daemon, and every test that
starts one, printed "option background_thread currently supports
pthread only".
The feature now comes from a Linux-only dependency entry of the daemon
crate, so the macOS build asks for nothing jemalloc cannot do. The
Linux build is as before: measured in the VM with four peers and a
collector, resident memory falls after the load without any setting
in the environment.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
