#! /bin/sh

##   Licensed to the Apache Software Foundation (ASF) under one or more
##   contributor license agreements.  See the NOTICE file distributed with
##   this work for additional information regarding copyright ownership.
##   The ASF licenses this file to You under the Apache License, Version 2.0
##   (the "License"); you may not use this file except in compliance with
##   the License.  You may obtain a copy of the License at
## 
##       http://www.apache.org/licenses/LICENSE-2.0
## 
##   Unless required by applicable law or agreed to in writing, software
##   distributed under the License is distributed on an "AS IS" BASIS,
##   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
##   See the License for the specific language governing permissions and
##   limitations under the License.

##   ==============================================
##   Environment variables:
##   JVM_ARGS - optional java args, e.g. -Dprop=val
##
##   e.g.
##   JVM_ARGS="-Xms512m -Xmx512m" jmeter etc.
##
##   ==============================================

# Minimal version to run JMeter
MINIMAL_VERSION=1.7.0

# Check if Java is present and the minimal version requirement
_java=`type java | awk '{ print $ NF }'`
CURRENT_VERSION=`"$_java" -version 2>&1 | awk -F'"' '/version/ {print $2}'`
minimal_version=`echo $MINIMAL_VERSION | awk -F'.' '{ print $2 }'`
current_version=`echo $CURRENT_VERSION | awk -F'.' '{ print $2 }'`
if [ $current_version ]; then
        if [ $current_version -lt $minimal_version ]; then
                 echo "Error: Java version is too low to run JMeter. Needs at least Java >= ${MINIMAL_VERSION}." 
                 exit 1
        fi
    else
         echo "Not able to find Java executable or version. Please check your Java installation."
         exit 1
fi

JMETER_OPTS=""
case `uname` in
   Darwin*)
   # Add Mac-specific property - should be ignored elsewhere (Bug 47064)
   JMETER_OPTS="-Xdock:name=JMeter -Xdock:icon="`dirname $0`/../docs/images/jmeter_square.png" -Dapple.laf.useScreenMenuBar=true -Dapple.eawt.quitStrategy=CLOSE_ALL_WINDOWS"
   ;;
esac


# resolve links - $0 may be a softlink (code as used by Tomcat)
# N.B. readlink would be a lot simpler but is not supported on Solaris
PRG="$0"

while [ -h "$PRG" ]; do
  ls=`ls -ld "$PRG"`
  link=`expr "$ls" : '.*-> \(.*\)$'`
  if expr "$link" : '/.*' > /dev/null; then
    PRG="$link"
  else
    PRG=`dirname "$PRG"`/"$link"
  fi
done

PRGDIR=`dirname "$PRG"`

# The following should be reasonably good values for most tests running
# on Sun JVMs. Following is the analysis on which it is based. If it's total
# gibberish to you, please study my article at
# http://www.atg.com/portal/myatg/developer?paf_dm=full&paf_gear_id=1100010&detailArticle=true&id=9606
# Original page has disappeared, it is now only available at: 
# https://web.archive.org/web/20060614151434/http://www.atg.com/portal/myatg/developer?paf_dm=full&paf_gear_id=1100010&detailArticle=true&id=9606
#
# JMeter objects can generally be grouped into three life-length groups:
#
# - Per-sample objects (results, DOMs,...). An awful lot of those.
#   Life length of milliseconds to a few seconds.
#
# - Per-run objects (threads, listener data structures,...). Not that many 
#   of those unless we use the table or tree listeners on heavy runs.
#   Life length of minutes to several hours, from creation to start of next run.
#
# - Per-work-session objects (test plans, GUIs,...).
#   Life length: for the life of the JVM.

# This is the base heap size -- you may increase or decrease it to fit your
# system's memory availability:
HEAP="-Xms512m -Xmx512m"

# There's an awful lot of per-sample objects allocated during test run, so we
# need a large eden to avoid too frequent scavenges -- you'll need to tune this
# down proportionally if you modify the HEAP values above, below example is fine for 512m of Heap:
# NEW="-XX:NewSize=128m -XX:MaxNewSize=128m"

# This ratio and target have been proven OK in tests with a specially high
# amount of per-sample objects (the HtmlParserHTMLParser tests):
# SURVIVOR="-XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=50"

# Think about it: trying to keep per-run objects in tenuring definitely
# represents a cost, but where's the benefit? They won't disappear before
# the test is over, and at that point we will no longer care about performance.
#
# So we will have JMeter do an explicit Full GC before starting a test run,
# but then we won't make any effort (or spend any CPU) to keep objects
# in tenuring longer than the life of per-sample objects -- which is hopefully
# shorter than the period between two scavenges):
#
TENURING="-XX:MaxTenuringThreshold=2"

# Java 8 remove Permanent generation, don't settings the PermSize
if [ $current_version -lt "8" ]; then
    # Increase MaxPermSize if you use a lot of Javascript in your Test Plan :
    PERM="-XX:PermSize=64m -XX:MaxPermSize=128m"
fi

CLASS_UNLOAD="-XX:+CMSClassUnloadingEnabled"

# Finally, some tracing to help in case things go astray:
#DEBUG="-verbose:gc -XX:+PrintTenuringDistribution"

# Always dump on OOM (does not cost anything unless triggered)
DUMP="-XX:+HeapDumpOnOutOfMemoryError"

SERVER="-server"

ARGS="$SERVER $DUMP $HEAP $NEW $SURVIVOR $TENURING $PERM $CLASS_UNLOAD"

java $ARGS $JVM_ARGS $JMETER_OPTS -jar "$PRGDIR/ApacheJMeter.jar" "$@"