Zabbix discoverer processes more than 75% busy

[root@86 ~]# grep  -n "StartDiscoverers" /usr/local/zabbix/etc/zabbix_server.conf
176:### Option: StartDiscoverers
182:# StartDiscoverers=1
vi /usr/local/zabbix/etc/zabbix_server.conf
### Option: StartDiscoverers
#       Number of pre-forked instances of discoverers.
#
# Mandatory: no
# Range: 0-250
# Default:
StartDiscoverers=5

vi zabbix_server.conf#修改StartPollers的参数
############ ADVANCED PARAMETERS ################

### Option: StartPollers
#       Number of pre-forked instances of pollers.
#
# Mandatory: no
# Range: 0-1000
# Default:
StartPollers=14

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