Setting MALLOC_ARENA_MAX=2 is claimed to reduce memory bloat caused by fragmentation. Jemalloc 3.x is also claimed to reduce memory bloat, but modern distros only ship Jemalloc 5.x, and supposedly only 3.x works. https://devcenter.heroku.com/articles/tuning-glibc-memory-behavior https://bugs.ruby-lang.org/issues/14718 https://www.speedshop.co/2017/12/04/malloc-doubles-ruby-memory.html https://www.joyfulbikeshedding.com/blog/2019-03-14-what-causes-ruby-memory-bloat.html
Config
This directory contains configuration files for Danbooru.
To configure your Danbooru instance, copy danbooru_default_config.rb to danbooru_local_config.rb and edit it. See danbooru_default_config.rb for details.
The only file here that end users need to be concerned about is danbooru_default_config.rb. The rest of the files here are internal Rails-related configuration files that end users shouldn't need to edit.