PostgreSQL的checkpoint能否并行

对于此问题，在社区进行了提问，并得到了一些大牛的解答：

http://postgresql.1045698.n5.nabble.com/Can-checkpoint-creation-be-parallel-td5773656.html

结论是：

It would not make sense to have more than one checkpoint going on 
at the same time; it is a point at which recovery can begin.