java 性能监控 jstack 线程死锁 JConsole 和 BTrace 图形化工具
ouuj7047
8年前
来自： http://blog.csdn.net//never_cxb/article/details/48197967
java 性能监控 工具
除了 javac java javap 之外, jdk 安装包还提供了很多其他工具
列出 bin 目录下的文件
TomChens-MacBook-Pro:Commands tomchen$ ls appletviewer javadoc jmap keytool serialver apt javah jmc native2ascii servertool extcheck javap jps orbd tnameserv idlj javaws jrunscript pack200 unpack200 jar jcmd jsadebugd policytool wsgen jarsigner jconsole jstack rmic wsimport java jdb jstat rmid xjc java_home jhat jstatd rmiregistry javac jinfo jvisualvm schemagen
jvisualvm
可以在线安装很多插件, 这是最新的非常强大的多合一故障处理工具
生成 Heap Dump, 可以在OQL Console 执行类似 sql 语句的 OQL
jvisualvm 的 BTrace 插件
生产环境服务无法停止的时候, 而日志里的信息无法满足我们需要时候, 可以通过这个打印调用堆栈 参数 返回值等
jconsole
也是一个图形化的监控工具
jps 虚拟机进程状况工具
类似于 ps 命令
jps -l 582 HttpFind 431 RefreshBlog.jar 585 sun.tools.jps.Jps
jstat 虚拟机统计信息监控工具
jstat -gcutil 431 S0 S1 E O P YGC YGCT FGC FGCT GCT 0.00 57.17 12.43 24.74 42.31 13 0.044 0 0.000 0.044
从中可以看出 survivor(S0 S1) eden (E) young GC(YGC) 等参数
jstat -class 434 Loaded Bytes Unloaded Bytes Time 17095 36897.7 1899 2970.9 14.87
类加载时间为14.87
jstack java堆栈管理工具
可以查看线程死锁
jstack 582 ...... ...... Found one Java-level deadlock: ============================= "Thread-199": waiting to lock monitor 0x00007facb3027608 (object 0x00000007e786b528, a java.lang.Integer), which is held by "Thread-3" "Thread-3": waiting to lock monitor 0x00007facb3026108 (object 0x00000007e786b518, a java.lang.Integer), which is held by "Thread-8" "Thread-8": waiting to lock monitor 0x00007facb3027608 (object 0x00000007e786b528, a java.lang.Integer), which is held by "Thread-3" Java stack information for the threads listed above: =================================================== "Thread-199": at HttpFind$SyncAdd.run(HttpFind.java:52) - waiting to lock <0x00000007e786b528> (a java.lang.Integer) at java.lang.Thread.run(Thread.java:722) "Thread-3": at HttpFind$SyncAdd.run(HttpFind.java:53) - waiting to lock <0x00000007e786b518> (a java.lang.Integer) - locked <0x00000007e786b528> (a java.lang.Integer) at java.lang.Thread.run(Thread.java:722) "Thread-8": at HttpFind$SyncAdd.run(HttpFind.java:53) - waiting to lock <0x00000007e786b528> (a java.lang.Integer) - locked <0x00000007e786b518> (a java.lang.Integer) at java.lang.Thread.run(Thread.java:722) Found 1 deadlock.