Out of swap space?

[sendarnav]

I am getting out of sweep error when running 23 simultanous reports. The follwing is the error

#
# A fatal error has been detected by the Java Runtime Environment:
#
# java.lang.OutOfMemoryError: requested 65536000 bytes for GrET in /BUILD_AREA/jdk6_18/hotspot/src/share/vm/utilities/growableArray.cpp. Out of swap space?
#
#  Internal Error (allocation.inline.hpp:39), pid=6376, tid=177642384
#  Error: GrET in /BUILD_AREA/jdk6_18/hotspot/src/share/vm/utilities/growableArray.cpp
#
# JRE version: 6.0_18-b07
# Java VM: Java HotSpot Server VM (16.0-b13 mixed mode linux-x86 )
# An error report file with more information is saved as:
# /apps03/jasper/apache-tomcat/bin/hs_err_pid6376.log
#
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp
#

The following is my memory setting

export JAVA_OPTS="$JAVA_OPTS -Xms3072m -Xmx3072m -XX:PermSize=512m -XX:MaxPermSize=512m -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled"
export JAVA_OPTS="$JAVA_OPTS -Djavax.xml.soap.MessageFactory=org.apache.axis.soap.MessageFactoryImpl -Djavax.xml.soap.SOAPConnectionFactory=org.apache.axis.soap.SOAPConnectionFactoryImpl -Djavax.xml.soap.SOAPFactory=org.apache.axis.soap.SOAPFactoryImpl -Djavax.xml.transform.TransformerFactory=org.apache.xalan.processor.TransformerFactoryImpl"

and Iam giving 15 as thread count and  1800000(30 minuets) as misfire threshold to make job wait in case long running reports

org.quartz.threadPool.threadCount=15
org.quartz.threadPool.threadPriority=5
org.quartz.jobStore.misfireThreshold=1800000

and using database pool size as 20.
 

What is idea configuration to make 50 job to run simultanously in that 10 will be long running.

Any help is appreciated