Changing the default Java Heap Size

Adding applications to uberSVN can, obviously, place greater demands on the Tomcat application server and system resources, especially memory.

If you plan to run additional applications on your uberSVN server, especially memory hungry ones like Jenkins then we strongly recommend that you increase the JAVA heap memory to avoid running into problems like OutOfMemory errors.

javax.servlet.ServletException: java.lang.OutOfMemoryError: PermGen space
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:268)

       Example memory error

• 1. Modify that script that starts up Tomcat. Setting the Maximum Heap to 1GB and the Perminent Generation size to 256MB.
  
  On Windows:
  c:\Program Files\WANdisco\ubersvn\tomcat\bin\service.bat

   "-Djava.io.tmpdir=%CATALINA_BASE%\temp;-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager;
   -Djava.util.logging.config.file=%CATALINA_BASE%\conf\logging.properties;
   -Dfile.encoding=UTF-8;
   -XX:MaxPermSize=256m" --JvmMs 128 --JvmMx 1024   
  

  
  
  On Linux: (This is for the record as Linux users shouldn't need to increase their heap size, but it's worth knowing how to make the change running on Linux.)
  /opt/ubersvn/bin/ubersvncontrol

   export CATALINA_OPTS="-Xms128m -Xmx1024m -XX:MaxPermSize=256m"   
  

• 2. Restart the server for the changes to take effect. The restart will interupt all use of Subversion, so you might want to warn people by sending an Admin Announcement.