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All,
Here's an updated script to check for maximum heap. I'm also including
the (simple) code for the MemoryInfo class referenced in the script (the
lack of this class being available was why the script failed for me
earlier).
Enjoy,
- -chris
maxheap.sh
- ----------
#!/bin/sh
#
# Set JAVA_OPTS to "-server" if you want to use the server JVM.
# Please don't set JAVA_OPTS to include either -Xms or -Xmx.
#
initial_max=${1:-4096}
max=${initial_max}
return_value=1
echo -n Working...
while [ "1" = "$return_value" -a "0" -lt "$max" ] ; do
if [ "0" == `expr ${max} % 100` ] ; then
echo
echo -n "Still working (currently checking ${max}M)..."
fi
output=`java -showversion $JAVA_OPTS -Xms${max}M -Xmx${max}M
MemoryInfo 2>&1`
return_value=$?
if [ "1" = "$return_value" ] ; then
max=`expr ${max} - 1`
fi
done
echo
if [ "0" = "$max" ] ; then
echo "No maximum heap size found. :("
else
echo Stopped with max=${max}
echo Return value was ${return_value}
echo Memory Info is:
echo "$output"
fi
MemoryInfo.java
- ---------------
public class MemoryInfo
{
public static void main(String[] args)
{
Runtime rt = Runtime.getRuntime();
System.out.printf("total=%10db (%4dMiB)", rt.totalMemory(),
(rt.totalMemory() / (1024*1024)));
System.out.println();
System.out.printf(" max=%10db (%4dMiB)", rt.maxMemory(),
(rt.maxMemory() / (1024*1024)));
System.out.println();
System.out.printf(" free=%10db (%4dMiB)", rt.freeMemory(),
(rt.freeMemory() / (1024*1024)));
System.out.println();
}
}
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