GC日志：
[2020-06-18T10:16:30,090][WARN ][o.e.m.j.JvmGcMonitorService] [es.ngsocnode4.qianxin.cn.0] [gc][8312841] overhead, spent [11.1m] collecting in the last [11.1m]
日志解讀：
[gc][這是第8312841次GC 檢查] 在最近11.1m 內花了11.1m用來做垃圾收集
GC日志：
[2020-06-18T10:17:12,181][WARN ][o.e.m.j.JvmGcMonitorService] [es.ngsocnode4.qianxin.cn.0] [gc][old][8312842][19750] duration [42s], collections [3]/[42s], total [42s]/[1.3h], memory [14.2gb]->[14.1gb]/[29.8gb], all_pools {[young] [17.7mb]->[1.7mb]/[1.2gb]}{[survivor] [0b]->[0b]/[153.5mb]}{[old] [14.1gb]->[14.1gb]/[28.5gb]}
日志解讀：
[本次GC為old] [是第8312842次GC檢查] [從jvm啟動是第19750次] [本次檢查耗時42s], [從上次檢查至今總共發生3次GC]/[從上次檢查至今已過去42秒], [本次檢查到的GC總耗時為42s秒]/[從 JVM 啟動至今發生的 GC 總耗時為1.3h小時],
memory [14.2gb]->[14.1gb]/[29.8gb]
[GC前Heapmemory空間] -> [GC后Heapmemory空間]/[Heapmemory總空間],
all_pools {[young] [17.7mb]->[1.7mb]/[1.2gb]}{[survivor] [0b]->[0b]/[153.5mb]}{[old] [14.1gb]->[14.1gb]/[28.5gb]}
{[young 區][GC 前 Memory ]->[GC后 Memory]/[young區 Memory 總大小] } {[survivor 區][GC 前 Memory ]->[GC后 Memory]/[survivor區 Memory 總大小] }{[old 區][GC 前 Memory ]->[GC后 Memory]/[old區 Memory 總大小] }
{[young] [17.7mb] -> [1.7mb]/[1.2gb]} {[survivor] [0b] -> [0b]/[153.5mb]} [old] [14.1gb]->[14.1gb]/[28.5gb]