jvm-gc调优1

1.项目启动  添加  -Xverify:none
类加载过程中禁止掉字节码验证过程

 

2.查看日志

添加

 -XX:+PrintGCDateStamps
-XX:+PrintGCDetails
-Xloggc:./logs/gclogs

生成日志

默认（21M）

2022-03-02T17:36:55.244+0800: 3.147: [Full GC (Metadata GC Threshold)……[Metaspace: 20511K->20511K(1067008K)], 0.0269635 secs][Times: user=0.06 sys=0.00, real=0.03 secs] 

2022-03-02T17:37:24.517+0800: 32.420: [Full GC (Metadata GC Threshold)…… [Metaspace: 34213K->34213K(1081344K)], 0.0795222 secs] [Times: user=0.19 sys=0.00, real=0.08 secs] 

2022-03-02T17:38:09.653+0800: 77.555: [Full GC (Metadata GC Threshold)…… [Metaspace: 56922K->56922K(1101824K)], 0.2143848 secs] [Times: user=0.66 sys=0.02, real=0.21 secs] 

-XX:MetaspaceSize=64M

2022-03-02T17:31:40.126+0800: 126.508: [Full GC (Metadata GC Threshold)  ……  [Metaspace: 63075K->63075K(1105920K)], 0.2714693 secs] [Times: user=0.70 sys=0.00, real=0.27 secs]