jvm排查工具箱jvm-tools下载使用详解
更新时间:2023年10月08日 11:19:02 作者:codecraft
这篇文章主要为大家介绍了jvm排查工具箱jvm-tools下载使用详解,有需要的朋友可以借鉴参考下,希望能够有所帮助,祝大家多多进步,早日升职加薪
序
本文主要介绍的是一款jvm排查工具箱:jvm-tools。除了对基本jvm封装外,还提供了jmx访问以及火焰图的生成。
下载
- sjk.jar - all commands without mxdump
- sjk-plus.jar - all commands
实例
cpu and memory usage
1 2 3 4 | java -jar sjk-0.9.jar ttop -o CPU -n 10 -p pid java -jar sjk-0.9.jar ttop -o USER -n 10 -p pid java -jar sjk-0.9.jar ttop -o SYS -n 10 -p pid java -jar sjk-0.9.jar ttop -o ALLOC -n 10 -p pid |
一个命令搞定排查造成cpu高的线程
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | root@d3daf1eca8ca:/ # java -jar sjk-0.9.jar ttop -o CPU -n 10 -p 1 Monitoring threads ... 2018-01-01T07:18:26.773+0000 Process summary process cpu=6.88% application cpu=1.37% (user=1.30% sys=0.07%) other: cpu=5.51% thread count: 25 GC time =0.00% (young=0.00%, old=0.00%) heap allocation rate 390kb /s safe point rate: 1.5 (events /s ) avg. safe point pause: 0.16ms safe point sync time : 0.01% processing time : 0.02% (wallclock time ) [000068] user= 1.30% sys= 0.02% alloc= 386kb /s - RMI TCP Connection(1)-172.17.0.2 [000070] user= 0.00% sys= 0.03% alloc= 4268b /s - JMX server connection timeout 70 [000047] user= 0.00% sys= 0.01% alloc= 0b /s - NioBlockingSelector.BlockPoller-1 [000060] user= 0.00% sys= 0.01% alloc= 52b /s - http-nio-8080-AsyncTimeout [000058] user= 0.00% sys= 0.00% alloc= 23b /s - http-nio-8080-ClientPoller-0 [000014] user= 0.00% sys= 0.00% alloc= 0b /s - container-0 [000002] user= 0.00% sys= 0.00% alloc= 0b /s - Reference Handler [000003] user= 0.00% sys= 0.00% alloc= 0b /s - Finalizer [000004] user= 0.00% sys= 0.00% alloc= 0b /s - Signal Dispatcher [000013] user= 0.00% sys= 0.00% alloc= 0b /s - ContainerBackgroundProcessor[StandardEngine[Tomcat]] |
histo
1 2 3 | java -jar sjk-0.9.jar hh -n 10 --dead -p pid java -jar sjk-0.9.jar hh -n 10 --dead-young -p pid java -jar sjk-0.9.jar hh -n 10 --live -p pid |
查看对象统计
1 2 3 4 5 6 7 8 9 10 11 12 13 | root@d3daf1eca8ca:/ # java -jar sjk-0.9.jar hh -n 10 --live -p 1 # Instances Bytes Type 1: 67025 9944432 [C 2: 9382 2209656 [I 3: 18413 1620344 java.lang.reflect.Method 4: 65810 1579440 java.lang.String 5: 4140 1283520 [B 6: 35735 1143520 java.util.concurrent.ConcurrentHashMap$Node 7: 8514 946936 java.lang.Class 8: 15267 610680 java.util.LinkedHashMap$Entry 9: 9027 505512 java.util.LinkedHashMap 10: 10414 494656 [Ljava.lang.Object; Total 475830 28175752 |
gc
查看gc日志
1 2 3 4 5 6 | root@d3daf1eca8ca:/ # java -jar sjk-0.9.jar gc -p 1 MBean server connected Collecting GC stats ... [GC: Copy #112 time: 4ms mem: Survivor Space: 0k+135k->135k[max:17088k] Compressed Class Space: 5190k+0k->5190k[max:1048576k] Eden Space: 18496k-18496k->0k[max:137152k] Metaspace: 41247k+0k->41247k Tenured Gen: 27515k+0k->27515k[max:342720k]] [GC: Copy #113 time: 2ms interval: 6649ms mem: Survivor Space: 135k+304k->439k[max:17088k,rate:45.83kb/s] Compressed Class Space: 5243k+0k->5243k[max:1048576k,rate:0.00kb/s] Eden Space: 18496k-18496k->0k[max:137152k,rate:-2781.77kb/s] Metaspace: 41696k+0k->41696k[rate:0.00kb/s] Tenured Gen: 27515k+0k->27515k[max:342720k,rate:0.00kb/s]] [GC: Copy #114 time: 3ms interval: 675ms mem: Survivor Space: 439k+779k->1219k[max:17088k,rate:1154.48kb/s] Compressed Class Space: 5338k+0k->5338k[max:1048576k,rate:0.00kb/s] Eden Space: 18496k-18496k->0k[max:137152k,rate:-27401.48kb/s] Metaspace: 42470k+0k->42470k[rate:0.00kb/s] Tenured Gen: 27515k+0k->27515k[max:342720k,rate:0.00kb/s]] |
stack
1 2 3 | ## collect 30 seconds java -jar sjk-0.9.jar stcap -o dump.std -t 30000 -p pid java -jar sjk-0.9.jar stcap -o dump.std -p pid |
dump线程堆栈
1 2 3 4 5 6 7 8 9 | root@d3daf1eca8ca:/ # java -jar sjk-0.9.jar stcap -o dump.std -p 1 Writing to /dump .std Collected 506 Collected 1012 Collected 1518 Collected 2001 Collected 2507 // ...... Trace dumped: 123211 |
查看堆栈或生成火焰图
1 2 3 | java -jar sjk-0.9.jar ssa -f dump.std --print java -jar sjk-0.9.jar ssa -f dump.std --histo java -jar sjk-0.9.jar ssa -f dump.std --flame > flame.svg |
jmx
1 2 3 | java -jar sjk-0.9.jar --help mx java -jar sjk-0.9.jar mx -mi -b java.lang: type =Threading -p pid java -jar sjk-0.9.jar mx -mg -b java.lang: type =Memory -f HeapMemoryUsage -p pid |
查看jmx
1 2 3 4 5 6 | root@d3daf1eca8ca:/ # java -jar sjk-0.9.jar mx -mg -b java.lang:type=Memory -f HeapMemoryUsage -p 1 java.lang: type =Memory committed: 68194304 init: 33554432 max: 508887040 used: 49297880 |
小结
使用ttop命名查看cpu高的线程,以及使用stack stcap和ssa生成火焰图相当便利,值得推荐。
doc
以上就是jvm排查工具箱jvm-tools下载使用详解的详细内容,更多关于jvm排查工具箱jvm-tools的资料请关注脚本之家其它相关文章!
微信公众号搜索 “ 脚本之家 ” ,选择关注
程序猿的那些事、送书等活动等着你
本文来自互联网用户投稿,该文观点仅代表作者本人,不代表本站立场。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。
如若内容造成侵权/违法违规/事实不符,请将相关资料发送至 reterry123@163.com 进行投诉反馈,一经查实,立即处理!
最新评论