我在phpfpm.conf中设置了pm.max_children = 100和pm = dynamic，并在nginx.conf中启用了phpfpm status api。但是我在状态api的结果中发现“最大活动进程数= 108”。为什么活动进程可以大于pm.max_children？
pool: www
process manager: dynamic
start time: 14/Feb/2019:11:22:50 +0800
start since: 7077
accepted conn: 513727
listen queue: 0
max listen queue: 21
listen queue len: 128
idle processes: 1
active processes: 19
total processes: 20
max active processes: 108
max children reached: 0
slow requests: 0
这是我在phpfpm.conf中的配置：
pm = dynamic
pm.max_children = 100
pm.start_servers = 12
pm.min_spare_servers = 5
pm.max_spare_servers = 20
pm.max_requests = 100