This section describes JVM statistics monitoring tool 'jstat' command and its command options and parameters.
"jstat": A JVM statistics monitoring tool
that displays performance statistics of a given JVM process with a specified sampling interval.
"jstat" tool is distributed as part of the Sun JDK package and represented by the \Progra~1\java\jdk1.6.0_02\bin\jstat.exe program file.
"jstat" can be executed with the following syntax:
jstat [options] vmid interval [count]
"options" - List of "jstat" command options.
"vmid" - Virtual machine identifier string to identify a local or a remote JVM process.
"interval" - Sampling interval in seconds (s) or mimilliseconds (ms).
"count" - Number of samples to collect. Default value is infinity;
that is, jstat displays statistics until the target JVM terminates or the jstat command is terminated.
Some "jstat" options are listed below:
"-t" - Display a timestamp column as the first column of output.
The timestamp is the the time since the start time of the target JVM.
"-class" - Display multiple columns of statistics on the behavior of the class loader.
"-compiler" - Display multiple columns of statistics of the behavior of the HotSpot Just-in-Time compiler.
"-gc" - Display multiple columns of statistics of the behavior of the garbage collected heap.
"-gcutil" - Display multiple columns of summary of garbage collection statistics.
"-gccapacity" - Display multiple columns of statistics of the capacities of the generations and their corresponding spaces.
See the next section on how to use "jstat" to collect statistic samples of a given JVM process.
