线上问题分析之java dump文件生成

一、查看java进程

jps

or

ps aux | grep java

二、生成dump文件

jmap -dump:live,format=b,file=xxxx.bin 进程ID

三、查看dump文件:

jhat启动分析web服务:

 jhat -J-mx512m xxxx.bin
Reading from xxxx.bin...
Dump file created Thu Mar 19 18:23:18 CST 2020
Snapshot read, resolving...
Resolving 1511510 objects...
Chasing references, expect 302 dots..............................................................................................................................................................................................................................................................................................................
Eliminating duplicate references..............................................................................................................................................................................................................................................................................................................
Snapshot resolved.
Started HTTP server on port 7000
Server is ready.

or

jvisualvm 启动可视化工具

线上问题分析之java dump文件生成_第1张图片

 

四、查看线程栈

jstack 进程ID

五、gc 查看

jstat -gc 进程ID //实时gc
S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT GCT 10752.0 10752.0 0.0 0.0 65536.0 36715.2 175104.0 0.0 4480.0 779.9 384.0 76.4 0 0.000 0 0.000 0.000
jstat -gc 6750 1000 10 //间隔1s,打印10s
S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT GCT 10752.0 10752.0 0.0 0.0 65536.0 36715.2 175104.0 0.0 4480.0 779.9 384.0 76.4 0 0.000 0 0.000 0.000 10752.0 10752.0 0.0 0.0 65536.0 36715.2 175104.0 0.0 4480.0 779.9 384.0 76.4 0 0.000 0 0.000 0.000 10752.0 10752.0 0.0 0.0 65536.0 36715.2 175104.0 0.0 4480.0 779.9 384.0 76.4 0 0.000 0 0.000 0.000 10752.0 10752.0 0.0 0.0 65536.0 36715.2 175104.0 0.0 4480.0 779.9 384.0 76.4 0 0.000 0 0.000 0.000 10752.0 10752.0 0.0 0.0 65536.0 36715.2 175104.0 0.0 4480.0 779.9 384.0 76.4 0 0.000 0 0.000 0.000 10752.0 10752.0 0.0 0.0 65536.0 36715.2 175104.0 0.0 4480.0 779.9 384.0 76.4 0 0.000 0 0.000 0.000 10752.0 10752.0 0.0 0.0 65536.0 36715.2 175104.0 0.0 4480.0 779.9 384.0 76.4 0 0.000 0 0.000 0.000 10752.0 10752.0 0.0 0.0 65536.0 36715.2 175104.0 0.0 4480.0 779.9 384.0 76.4 0 0.000 0 0.000 0.000 10752.0 10752.0 0.0 0.0 65536.0 36715.2 175104.0 0.0 4480.0 779.9 384.0 76.4 0 0.000 0 0.000 0.000 10752.0 10752.0 0.0 0.0 65536.0 36715.2 175104.0 0.0 4480.0 779.9 384.0 76.4 0 0.000 0 0.000 0.000

 

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