线上问题分析之java dump文件生成

2020-09-10 23:38:57 浏览数 (2)

一、查看java进程

代码语言：javascript复制
jps

or

ps aux | grep java

二、生成dump文件

代码语言：javascript复制
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：

代码语言：javascript复制
 jhat -J-mx512m xxxx.bin
代码语言：javascript复制
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

四、查看线程栈

代码语言：javascript复制
jstack 进程ID

五、gc 查看

代码语言：javascript复制
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
代码语言：javascript复制
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
java dump gc web 进程

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