Free-threaded Python

On a free-threaded build such as 3.14t the GIL stays off: no tinyjobs module turns it back on, so def tasks run in parallel in the worker's thread pool. A worker is still one event loop, and one loop is one thread; loops= gives a worker several, each in its own thread with its own Redis or Postgres connection, sharing concurrency between them:

tinyjobs worker --app tasks:app --concurrency 64 --loops 3

From Python, app.worker(concurrency=64, loops=3).run() does the same.

Only the first loop fires cron and prunes. loops is for tinyjobs worker and worker.run(): an embedded worker lives on the server's loop and refuses it. SQLite refuses loops above 1, since its one writer would make them wait on each other, and with the GIL on extra loops take turns on it, so run more processes there instead.

Two installs differ. psycopg-binary has no free-threaded wheels: install psycopg psycopg-pool and the system libpq rather than the postgres extra. hiredis turns the GIL back on as soon as redis-py imports it, so leave it out; a worker that finds the GIL on in a free-threaded build says so in its log.