[thredds] -XX:MaxPermSize JAVA_OPTS setting to solve frequent PermGen errors

Hi All,
With Rich Signell's help, I was recently able to end a bout of daily PermGen 
errors after my TDS 4.2 upgrade and wanted to shared the solution here in case 
it might be useful to others. As recommended in TDS training, I had previously 
used the following JAVA_OPTS settings to increase the initial and maximum 
allocated memory of the JVM to help performance and avoid frequent PermGen 

-Xms512m -Xmx1500m

However, after 4.2 my system was hung with daily PermGen errors in my 
catalina.out despite the above settings. In addition to the above, Rich 
recommended the following, which I also subsequently found echoed in the TDS 
FAQ (which shows 128m):


Since making the above addition, I have not had anymore PermGen errors.
John Maurer
Hawaii Ocean Observing System (HiOOS)
University of Hawaii

P.S. You can update JAVA_OPTS in $TOMCAT/bin/setenv.sh. My file includes the 
following line for JAVA_OPTS (plus a couple others for setting JAVA_HOME and 

JAVA_OPTS="-Xmx1500m -Xms512m -XX:MaxPermSize=180m -server 
export JAVA_OPTS

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