Not only is fsync coarse, but also has a bunch of other issues. See https://www.postgresql.org/message-id/flat/CAMsr%2BYHh%2B5Oq4xziwwoEfhoTZgr07vdGG%2Bhu%3D1ad

Not only is fsync coarse, but also has a bunch of other issues. See https://www.postgresql.org/message-id/flat/CAMsr%2BYHh%2B5Oq4xziwwoEfhoTZgr07vdGG%2Bhu%3D1adXx59aTeaoQ%40mail.gmail.com#CAMsr+YHh+5Oq4xziwwoEfhoTZgr07vdGG+hu=1adXx59aTeaoQ@mail.gmail.com https://www.postgresql.org/message-id/flat/CAMsr%2BYHh%2B5Oq...