3 ms·PostgreSQL uses ARC (actually 2Q which is very similar), and they worked around the patent.by olavgg 10y agoPostgreSQL uses ARC (actually 2Q which is very similar), and they worked around the patent.anarazel 10y agoNope, no arc there anymore. It got ripped out shortly after introduction due to IP concerns.anarazel 10y agoPostgres doesn't use 2Q either, sorry. It's a simple clock-sweep approximated LRU implementation currently.