一、jps 查詢正在執行的虛擬機器程序。

-m輸出虛擬機器程序啟動時傳遞給main()函式的引數

-l輸出程序執行的主類的全名

-v輸出虛擬機器程序啟動時的JVM引數 

二、jinfo 檢視虛擬機器配置引數資訊

三、jstack 生成java虛擬機器當前時刻的執行緒快照

-F：當正常輸出請求不被響應時，強制輸出執行緒棧堆。

-l：顯示關於鎖的附加資訊。

-m：顯示本地方法棧

四、jmap 生成虛擬機器記憶體轉儲快照

Usage:
    jmap [option] <pid>
        (to connect to running process)
    jmap [option] <executable <core>
        (to connect to a core file)
    jmap [option] [
 
[email protected]]<remote server IP or hostname>
        (to connect to remote debug server)

where <option> is one of:
    <none>               to print same info as Solaris pmap
    -heap                to print java heap summary
    -histo[:live]        to print histogram of java object heap; if the "live"
                         suboption is specified, only count live objects
    -clstats             to print class loader statistics
    -finalizerinfo       to print information on objects awaiting finalization
    -dump:<dump-options> to dump java heap in hprof binary format
                         dump-options:
                           live         dump only live objects; if not specified,
                                        all objects in the heap are dumped.
                           format=b     binary format
                           file=<file>  dump heap to <file>
                         Example: jmap -dump:live,format=b,file=heap.bin <pid>
    -F                   force. Use with -dump:<dump-options> <pid> or -histo
                         to force a heap dump or histogram when <pid> does not
                         respond. The "live" suboption is not supported
                         in this mode.
    -h | -help           to print this help message
    -J<flag>             to pass <flag> directly to the runtime system
 

五、jhat 分析 Jmap 產生的堆複製檔案

jhat -J-Xmx512m heap.dmp