contrib-munin/plugins/jvm/jstat__heap

#!/bin/bash
#
# Plugin for monitor JVM activity - Heap Usage -
#
# Usage:
#
#       Symlink into /etc/munin/plugins/ and add the monitored
#	alias name like :
#
#       ln -s /usr/share/munin/plugins/jstat__heap \
#	  /etc/munin/plugins/jstat_<jvm alias>_heap
#       This should, however, be given through autoconf and suggest.
#
# Requirements:
#
#	You need to execute your Java program under jsvc provided by
#	  http://jakarta.apache.org/commons/daemon/
#	which enables you to run your Java program with specified
#	pid file with -pidfile option.
#       A Brief setup documentation is also available at
#         http://tomcat.apache.org/tomcat-5.5-doc/setup.html
#
# Target:
#
#	Target Java Virtual Machine to monitor are:
#	  Sun JDK 5.0 (http://java.sun.com/javase/) (default)
#	  BEA JRockit 5.0 (http://dev2dev.bea.com/jrockit/)
#
# Parameters:
#
#       config   (required)
#
# Config variables:
#
#       pidfilepath  - Which file path use. Defaults to '/var/run/jsvc.pid'
#       javahome     - override automatic detection of JRE directory
#       graphtitle   - Title of the graph (defaults to PID file location)
#

default_java_home=/usr/lib/jvm/default-java
[ -e "$default_java_home" ] || default_java_home=/usr/local/java/jdk

pidfilepath=${pidfilepath:-/var/run/jsvc.pid}
graphtitle=${graphtitle:-$pidfilepath}
JAVA_HOME=${javahome:-$default_java_home}

export JAVA_HOME

#
# Functions
#
chk_jdk()
{
  isJRockit=`${JAVA_HOME}/bin/java -version 2>&1 | egrep -i 'jrockit'`
  if [ -n "${isJRockit}" ]; then
    JDK_TYPE="bea"
  else
    JDK_TYPE="sun"
  fi
}

chk_version()
{
  Version=`${JAVA_HOME}/bin/java -version 2>&1 | egrep '^java version' | awk '{print $3}' | sed -e 's/\"//g' | cut -d'_' -f 1`
  if [ "${Version}" != "1.5.0" ]; then
    return 1
  else
    return 0
  fi
}

print_config() {
    echo "graph_title Heap Usage" $graphtitle
    echo "graph_args --base 1024 -l 0"
    echo "graph_vlabel Heap Usage(Bytes)"
    echo "graph_info Heap Usage"
    echo "graph_category virtualization"

    if [ "${JDK_TYPE}" == "bea" ]; then
        echo "NurserySize.label NurserySize"
        echo "HeapSize.label HeapSize"
        echo "UsedHeapSize.label UsedHeapSize"
        echo "NurserySize.draw AREA"
        echo "HeapSize.draw STACK"
        echo "UsedHeapSize.draw STACK"
    else
        echo "Eden_Used.label Eden_Used"
        echo "Eden_Free.label Eden_Free"
        echo "Survivor0_Used.label Survivor0_Used"
        echo "Survivor0_Free.label Survivor0_Free"
        echo "Survivor1_Used.label Survivor1_Used"
        echo "Survivor1_Free.label Survivor1_Free"
        echo "Old_Used.label Old_Used"
        echo "Old_Free.label Old_Free"
        echo "Permanent_Used.label Permanent_Used"
        echo "Permanent_Free.label Permanent_Free"
        echo "Eden_Used.draw AREA"
        echo "Eden_Free.draw STACK"
        echo "Survivor0_Used.draw STACK"
        echo "Survivor0_Free.draw STACK"
        echo "Survivor1_Used.draw STACK"
        echo "Survivor1_Free.draw STACK"
        echo "Old_Used.draw STACK"
        echo "Old_Free.draw STACK"
        echo "Permanent_Used.draw STACK"
        echo "Permanent_Free.draw STACK"
    fi
}


print_stats() {
    local pid_num="$1"
    local awk_script
    if [ "${JDK_TYPE}" == "bea" ]; then
        # shellcheck disable=SC2016
        awk_script='{
            HeapSize = $1;
            NurserySize = $2;
            UsedHeapSize = $3;
            print "NurserySize.value " NurserySize * 1024;
            print "HeapSize.value " HeapSize * 1024;
            print "UsedHeapSize.value " UsedHeapSize * 1024; }'
    else
        # shellcheck disable=SC2016
        awk_script='{
            S0C = $1;
            S1C = $2;
            S0U = $3;
            S1U = $4;
            EC  = $5;
            EU  = $6;
            OC  = $7;
            OU  = $8;
            PC  = $9;
            PU  = $10;
            S0F = S0C - S0U;
            S1F = S1C - S1U;
            EF  = EC  - EU;
            OF  = OC  - OU;
            PF  = PC  - PU;
            print "Eden_Used.value " EU * 1024;
            print "Eden_Free.value " EF * 1024;
            print "Survivor0_Used.value " S0U * 1024;
            print "Survivor0_Free.value " S0F * 1024;
            print "Survivor1_Used.value " S1U * 1024;
            print "Survivor1_Free.value " S1F * 1024;
            print "Old_Used.value " OU * 1024;
            print "Old_Free.value " OF * 1024;
            print "Permanent_Used.value " PU * 1024;
            print "Permanent_Free.value " PF * 1024; }'
    fi
    "${JAVA_HOME}/bin/jstat" -gc "$pid_num" | tail -1 | awk "$awk_script"
}


#
# common for all argument
#
chk_jdk

#
# autoconf
#
if [ "$1" = "autoconf" ]; then

  if [ ! -x "${JAVA_HOME}/bin/jstat" ]; then
    echo "no (No jstat found in ${JAVA_HOME}/bin)"
    exit 1
  fi

  chk_version
  if [ $? != 0 ]; then
    echo "no (Java version is invalid)"
    exit 1
  fi

  if [ ! -f "${pidfilepath}" -o ! -r "${pidfilepath}" ]; then
    echo "no (No such file ${pidfilepath} or cannot read ${pidfilepath}"
    exit 1
  fi

  echo "yes"
  exit 0
fi


if [ "$1" = "config" ]; then
    print_config
fi

print_stats "$(cat "$pidfilepath")"