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.
本文转自健哥的数据花园博客园博客，原文链接：http://www.cnblogs.com/gaojian/p/3358482.html，如需转载请自行联系原作者
