mirror of
https://github.com/munin-monitoring/contrib.git
synced 2025-07-21 02:33:18 +00:00
f0548a37de
Java8. jstat column output is not stable across JVM versions (technically version of jstat binary used). New columns are added not add the end of column list but in the middle breaking access via constant index. Following table shows the known columns per version: Oracle JDK / OpenJDK 1.5 .. 1.7 S0C S1C S0U S1U EC EU OC OU PC PU YGC YGCT FGC FGCT GCT Openjdk 1.8 .. 10 S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT GCT Openjdk 11 .. 12 S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT CGC CGCT GCT Earlier commit here added support for java8+ but using version checking if version == 1.5 > Use pre-java8 column format, else new format. As fixing java6+7 would mean more version comparison which is ugly this cmomit changes retrival logic to the following; a.) Parse first line jstat output to find position for each label b.) Then use that position to fetch value from 2nd line That way code auto-adjusts to any ordering change without needing any java version specific code or checks. On the way fix 'Permanent Used' value reporting for java8 which was broken (missing variable rename from PU -> MU when java8 support was added).
132 lines
3.4 KiB
Bash
Executable file
132 lines
3.4 KiB
Bash
Executable file
#!/bin/sh
|
|
#
|
|
# Plugin for monitor JVM activity - GC Count -
|
|
#
|
|
# Usage:
|
|
#
|
|
# Symlink into /etc/munin/plugins/ and add the monitored
|
|
# alias name like :
|
|
#
|
|
# ln -s /usr/share/munin/plugins/jstat__gccount \
|
|
# /etc/munin/plugins/jstat_<jvm alias>_gccount
|
|
# 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/)
|
|
# Sun JDK 8.0 (http://java.sun.com/javase/)
|
|
# OpenJDK 1.7 .. 11 (https://openjdk.java.net/)
|
|
# 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
|
|
|
|
|
|
get_jdk_type() {
|
|
local version
|
|
if "${JAVA_HOME}/bin/java" -version 2>&1 | grep -qi 'jrockit'; then
|
|
echo "bea"
|
|
else
|
|
echo "sun"
|
|
fi
|
|
}
|
|
|
|
|
|
print_config() {
|
|
echo "graph_title GC Count $graphtitle"
|
|
echo 'graph_args -l 0'
|
|
echo 'graph_vlabel GC Count(times)'
|
|
echo 'graph_total total'
|
|
echo 'graph_info GC Count'
|
|
echo 'graph_category virtualization'
|
|
|
|
echo 'Young_GC.label Young_GC'
|
|
echo 'Young_GC.min 0'
|
|
if [ "${JDK_TYPE}" = "bea" ]; then
|
|
echo 'Old_GC.label Old_GC'
|
|
echo 'Old_GC.min 0'
|
|
else
|
|
echo 'Full_GC.label Full_GC'
|
|
echo 'Full_GC.min 0'
|
|
fi
|
|
}
|
|
|
|
|
|
print_stats() {
|
|
local pid_num="$1"
|
|
local awk_script
|
|
if [ "${JDK_TYPE}" = "bea" ]; then
|
|
# shellcheck disable=SC2016
|
|
awk_script='{ YC = $4; OC = $5; print "Young_GC.value " YGC; print "Old_GC.value " FGC; }'
|
|
else
|
|
# List & Order of columns of jstat changes with java versions
|
|
# idx["YGC"] is index of YGC column in output (i.e. 13)
|
|
# $idx["YGC"] then accesses the value at this position (taken from 2nd line of the output)
|
|
# shellcheck disable=SC2016
|
|
awk_script='
|
|
NR==1 {
|
|
for (i=1;i<=NF;i++) idx[$i]=i
|
|
}
|
|
NR==2 {
|
|
print "Young_GC.value " $idx["YGC"];
|
|
print "Full_GC.value " $idx["FGC"];
|
|
}'
|
|
fi
|
|
"${JAVA_HOME}/bin/jstat" -gc "$pid_num" | awk "$awk_script"
|
|
}
|
|
|
|
|
|
#
|
|
# autoconf
|
|
#
|
|
if [ "$1" = "autoconf" ]; then
|
|
|
|
if [ ! -x "${JAVA_HOME}/bin/jstat" ]; then
|
|
echo "no (No jstat found in ${JAVA_HOME}/bin)"
|
|
elif [ ! -f "$pidfilepath" ]; then
|
|
echo "no (missing file $pidfilepath)"
|
|
elif [ ! -r "$pidfilepath" ]; then
|
|
echo "no (cannot read $pidfilepath)"
|
|
else
|
|
echo "yes"
|
|
fi
|
|
exit 0
|
|
fi
|
|
|
|
|
|
JDK_TYPE=$(get_jdk_type)
|
|
|
|
|
|
if [ "$1" = "config" ]; then
|
|
print_config
|
|
exit 0
|
|
fi
|
|
|
|
print_stats "$(cat "$pidfilepath")"
|