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jmap - Memory Map.htm 5KB

jsadebugd - Serviceability Agent Debug Daemon.htm 5KB

jstat - Java Virtual Machine Statistics Monitoring Tool.htm 34KB

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jstat - Java Virtual Machine Statistics Monitoring Tool_files

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">  <HTML><HEAD><TITLE>jstat - Java Virtual Machine Statistics Monitoring Tool</TITLE> <META http-equiv=Content-Type content="text/html; charset=gb2312"> <META content=reference name=collection><LINK href="jstat%20-%20Java%20Virtual%20Machine%20Statistics%20Monitoring%20Tool_files/tooldoc.css" type=text/css rel=stylesheet> <META content="MSHTML 6.00.6001.18294" name=GENERATOR></HEAD> <BODY bgColor=white> <H1>jstat - Java Virtual Machine Statistics Monitoring Tool</H1> <UL> <LI><A href="http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/tooldocs/share/jstat.html#synopsis">Synopsis</A> <LI><A href="http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/tooldocs/share/jstat.html#description">Description</A> <LI><A href="http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/tooldocs/share/jstat.html#vmidentifier">Virtual Machine Identifier</A> <LI><A href="http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/tooldocs/share/jstat.html#options">Options</A>   - <A href="http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/tooldocs/share/jstat.html#general_options">General Options</A>   - <A href="http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/tooldocs/share/jstat.html#output_options">Output Options</A> <LI><A href="http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/tooldocs/share/jstat.html#examples">Examples</A> <LI><A href="http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/tooldocs/share/jstat.html#seealso">See Also</A> </LI></UL><A name=synopsis> <H2>SYNOPSIS</H2></A><PRE>jstat [ generalOption | outputOptions vmid [interval[s|ms] [count]] ]</PRE> <DL> <DT><CODE><A href="http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/tooldocs/share/jstat.html#general_options">generalOption</A></CODE> <DD>A single general command-line option (-help, -options, or -version) <A href="http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/tooldocs/share/jstat.html#output_options"> <DT><CODE>outputOptions</CODE></A> <DD>One or more output options, consisting of a single statOption, plus any of the -t, -h, and -J options. <A href="http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/tooldocs/share/jstat.html#vmidentifier"> <DT><CODE>vmid</CODE></A> <DD>Virtual machine identifier, a string indicating the target Java virtual machine (JVM). The general syntax is <PRE>[protocol:][//]lvmid[@hostname[:port]/servername]</PRE>The syntax of the vmid string largely corresponds to the syntax of a URI. The vmid can vary from a simple integer representing a local JVM to a more complex construction specifying a communications protocol, port number, and other implementation-specific values. See <A href="http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/tooldocs/share/jstat.html#vmidentifier">Virtual Machine Identifier</A> for details. <DT><CODE>interval[s|ms]</CODE> <DD>Sampling interval in the specified units, seconds (s) or milliseconds (ms). Default units are milliseconds.  Must be a positive integer.  If specified, jstat will produce its output at each interval. <DT><CODE>count</CODE> <DD>Number of samples to display. Default value is infinity; that is, jstat displays statistics until the target JVM terminates or the jstat command is terminated.  Must be a positive integer. </DD></DL><A name=description> <H2>DESCRIPTION</H2></A> The jstat tool displays performance statistics for an instrumented HotSpot Java virtual machine (JVM). The target JVM is identified by its virtual machine identifier, or <A href="http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/tooldocs/share/jstat.html#vmidoption">vmid</A> option described below. NOTE: This utility is unsupported and may not be available in future versions of the J2SE SDK. It is not currently available on Windows 98 and Windows ME platforms. <A name=vmidoption></A> <H3><A name=vmidentifier>VIRTUAL MACHINE IDENTIFIER</A></H3> The syntax of the vmid string largely corresponds to the syntax of a URI: <PRE>[protocol:][//]lvmid[@hostname][:port][/servername]</PRE> <DL> <DT><A name=protocol><CODE>protocol</CODE></A> <DD>The communications protocol. If the protocol is omitted and a hostname is not specified, the default protocol is a platform specific optimized local protocol. If the protocol is omitted and a hostname is specified, then the default protocol is rmi. <DT><A name=lvmid><CODE>lvmid</CODE></A> <DD>The local virtual machine identifier for the target JVM. The lvmid is a platform-specific value that uniquely identifies a JVM on a system. The lvmid is the only required component of a virtual machine identifier. The lvmid is typically, but not necessarily, the operating system's process identifier for the target JVM process. You can use the <A href="http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/tooldocs/share/jps.html">jps</A> command to determine the lvmid. Also, you can determine lvmid on Unix platforms with the ps command, and on Windows with the Windows Task Manager. <DT><A name=hostname><CODE>hostname</CODE></A> <DD>A hostname or IP address indicating the target host. If hostname is omitted, then the target host is the local host. <DT><A name=port><CODE>port</CODE></A> <DD>The default port for communicating with the remote server. If the hostname is omitted or the protocol specifies an optimized, local protocol, then port is ignored. Otherwise, treatment of the port parameter is implementation specific. For the default rmi protocol, the port indicates the port number for the rmiregistry on the remote host. If port is omitted, and protocol indicates rmi, then the default rmiregistry port (1099) is used. <DT><A name=servername><CODE>servername</CODE></A> <DD>The treatment of this parameter depends on implementation. For the optimized local protocol, this field is ignored. For the rmi protocol, it represents the name of the RMI remote object on the remote host. </DD></DL><A name=options> <H2>OPTIONS</H2></A> The jstat command supports two types of options, <A href="http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/tooldocs/share/jstat.html#general_options">general options</A> and <A href="http://download.oracle.com/docs/cd/E17476_01/javase/1.5.0/docs/tooldocs/share/jstat.html#output_options">output options</A>. General options cause jstat to display simple usage and version information. Output options determine the content and format of the statistical output. NOTE: All options, and their functionality are subject to change or removal in future releases. <H3><A name=general_options></A>GENERAL OPTIONS</H3> If you specify one of the general options, you cannot specify any other option or parameter. <DL> <DT>-help <DD>Display help message. <DT>-version <DD>Display version information. <DT>-options <DD>Display list of statistics options. See the <A href="http://download.orac

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