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+show-busy-java-threads
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+# 从所有运行的Java进程中找出最消耗CPU的线程(缺省5个),打印出其线程栈
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+
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+# 缺省会自动从所有的Java进程中找出最消耗CPU的线程,这样用更方便
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+# 当然你可以手动指定要分析的Java进程Id,以保证只会显示出那个你关心的那个Java进程的信息
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+show-busy-java-threads -p <指定的Java进程Id>
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+
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+show-busy-java-threads -c <要显示的线程栈数>
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+
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+show-busy-java-threads <重复执行的间隔秒数> [<重复执行的次数>]
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+# 多次执行;这2个参数的使用方式类似vmstat命令
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+
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+show-busy-java-threads -a <运行输出的记录到的文件>
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+# 记录到文件以方便回溯查看
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+
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+show-duplicate-java-classes -S <存储jstack输出文件的目录>
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+# 指定jstack输出文件的存储目录,方便记录以后续分析
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+
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+##############################
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+# 注意:
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+##############################
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+# 如果Java进程的用户 与 执行脚本的当前用户 不同,则jstack不了这个Java进程
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+# 为了能切换到Java进程的用户,需要加sudo来执行,即可以解决:
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+sudo show-busy-java-threads
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+
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+show-busy-java-threads -s <指定jstack命令的全路径>
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+# 对于sudo方式的运行,JAVA_HOME环境变量不能传递给root,
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+# 而root用户往往没有配置JAVA_HOME且不方便配置,
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+# 显式指定jstack命令的路径就反而显得更方便了
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+
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+# -m选项:执行jstack命令时加上-m选项,显示上Native的栈帧,一般应用排查不需要使用
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+show-busy-java-threads -m
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+# -F选项:执行jstack命令时加上 -F 选项(如果直接jstack无响应时,用于强制jstack),一般情况不需要使用
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+show-busy-java-threads -F
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+# -l选项:执行jstack命令时加上 -l 选项,显示上更多相关锁的信息,一般情况不需要使用
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+# 注意:和 -m -F 选项一起使用时,可能会大大增加jstack操作的耗时
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+show-busy-java-threads -l
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+
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+# 帮助信息
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+$ show-busy-java-threads -h
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+Usage: show-busy-java-threads [OPTION]... [delay [count]]
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+Find out the highest cpu consumed threads of java, and print the stack of these threads.
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+
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+Example:
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+ show-busy-java-threads # show busy java threads info
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+ show-busy-java-threads 1 # update every 1 second, (stop by eg: CTRL+C)
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+ show-busy-java-threads 3 10 # update every 3 seconds, update 10 times
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+
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+Output control:
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+ -p, --pid <java pid> find out the highest cpu consumed threads from
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+ the specified java process, default from all java process.
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+ -c, --count <num> set the thread count to show, default is 5.
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+ -a, --append-file <file> specifies the file to append output as log.
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+ -S, --store-dir <dir> specifies the directory for storing intermediate files, and keep files.
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+ default store intermediate files at tmp dir, and auto remove after run.
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+ use this option to keep files so as to review jstack/top/ps output later.
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+ delay the delay between updates in seconds.
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+ count the number of updates.
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+ delay/count arguments imitates the style of vmstat command.
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+
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+jstack control:
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+ -s, --jstack-path <path> specifies the path of jstack command.
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+ -F, --force set jstack to force a thread dump.
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+ use when jstack <pid> does not respond (process is hung).
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+ -m, --mix-native-frames set jstack to print both java and native frames (mixed mode).
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+ -l, --lock-info set jstack with long listing. Prints additional information about locks.
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+
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+cpu usage calculation control:
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+ -d, --top-delay specifies the delay between top samples, default is 0.5 (second).
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+ get thread cpu percentage during this delay interval.
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+ more info see top -d option. eg: -d 1 (1 second).
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+ -P, --use-ps use ps command to find busy thread(cpu usage) instead of top command,
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+ default use top command, because cpu usage of ps command is expressed as
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+ the percentage of time spent running during the *entire lifetime*
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+ of a process, this is not ideal in general.
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+
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+Miscellaneous:
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+ -h, --help display this help and exit.
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