qileilove

          blog已經轉移至github,大家請訪問 http://qaseven.github.io/

          使用java自帶工具監控jvm運行狀態

           1.jps:查看當前運行著的java進程(仿linux下的ps),顯示進程號
            2. jinfo: 查參數jinfo -flagPermSize 2208(進程號)
          jinfo -flag MaxPermSize 2208(進程號)
          C:\Users\WILL>jinfo
          Usage:
          jinfo <option> <pid>
          (to connect to a running process)
          where <option> is one of:
          -flag <name>         to print the value of the named VM flag
          -flag [+|-]<name>    to enable or disable the named VM flag
          -flag <name>=<value> to set the named VM flag to the given value
          -h | -help           to print this help message
            3. jconsole 2208
            用法:
          jconsole [ -interval=n ] [ -notile ] [ -pluginpath <path> ] [ -version ] [ connection ...]
          -interval   將更新間隔時間設置為 n 秒(默認值為 4 秒)
          -notile     最初不平鋪顯示窗口(對于兩個或更多連接)
          -pluginpath 指定 jconsole 用于查找插件的路徑
          -version    輸出程序版本
          connection = pid || host:port || JMX URL (service:jmx:<protocol>://...)
          pid       目標進程的進程 ID
          host      遠程主機名或 IP 地址
          port      用于遠程連接的端口號
          -J          對正在運行 jconsole 的 Java 虛擬機指定
            輸入參數
            4. jstack  2208列出所有線程,以及線程的運行狀態
          C:\Users\WILL>jstack
          Usage:
          jstack [-l] <pid>
          (to connect to running process)
          Options:
          -l  long listing. Prints additional information about locks
          -h or -help to print this help message


            5. jstat -gcutil 2208 1000(每隔1000毫秒打印一次信息) 10(打印10行)
          C:\Users\WILL>jstat
          invalid argument count
          Usage: jstat -help|-options
          jstat -<option> [-t] [-h<lines>] <vmid> [<interval> [<count>]]
          Definitions:
          <option>      An option reported by the -options option
          <vmid>        Virtual Machine Identifier. A vmid takes the following form:
          <lvmid>[@<hostname>[:<port>]]
          Where <lvmid> is the local vm identifier for the target
          Java virtual machine, typically a process id; <hostname> is
          the name of the host running the target Java virtual machine;
          and <port> is the port number for the rmiregistry on the
          target host. See the jvmstat documentation for a more complete
          description of the Virtual Machine Identifier.
          <lines>       Number of samples between header lines.
          <interval>    Sampling interval. The following forms are allowed:
          <n>["ms"|"s"]
          Where <n> is an integer and the suffix specifies the units as
          milliseconds("ms") or seconds("s"). The default units are "ms".
          <count>       Number of samples to take before terminating.
          -J<flag>      Pass <flag> directly to the runtime system.
            C:\Users\WILL>jstat -options
            -class
            -compiler
            -gc
            -gccapacity
            -gccause
            -gcnew
            -gcnewcapacity
            -gcold
            -gcoldcapacity
            -gcpermcapacity
            -gcutil
            -printcompilation
            6. jmap把虛擬機里運行著的所有文件都down下來,相當于快照
          C:\Users\WILL>jmap
          Usage:
          jmap -histo <pid>
          (to connect to running process and print histogram of java object heap
          jmap -dump:<dump-options> <pid>
          (to connect to running process and dump java heap)
          dump-options:
          format=b     binary default
          file=<file>  dump heap to <file>
          Example:       jmap -dump:format=b,file=heap.bin <pid>
            7. jhat 對jmap下來的文件進行分析,多個角度
          Usage:  jhat [-stack <bool>] [-refs <bool>] [-port <port>] [-baseline <file>] [-
          debug <int>] [-version] [-h|-help] <file>
          -J<flag>          Pass <flag> directly to the runtime system. For
          example, -J-mx512m to use a maximum heap size of 512MB
          -stack false:     Turn off tracking object allocation call stack.
          -refs false:      Turn off tracking of references to objects
          -port <port>:     Set the port for the HTTP server.  Defaults to 7000
          -exclude <file>:  Specify a file that lists data members that should
          be excluded from the reachableFrom query.
          -baseline <file>: Specify a baseline object dump.  Objects in
          both heap dumps with the same ID and same class will
          be marked as not being "new".
          -debug <int>:     Set debug level.
          0:  No debug output
          1:  Debug hprof file parsing
          2:  Debug hprof file parsing, no server
          -version          Report version number
          -h|-help          Print this help and exit
          <file>            The file to read
          For a dump file that contains multiple heap dumps,
          you may specify which dump in the file
          by appending "#<number>" to the file name, i.e. "foo.hprof#3".
          All boolean options default to "true"
            圖片又不能上傳。。。就打印出這些幫助參數來,能看懂得了。

          posted on 2014-03-24 11:48 順其自然EVO 閱讀(1076) 評論(0)  編輯  收藏


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