Increasing performance with the DTP Engine for Java
For big projects and configurations that have enabled a great quantity of rules (corerules ~650 rules) or memory demanding global rules for the test run, we recommend increasing the Java Virtual Memory for the DTP Engine for Java.
According to the article https://dzone.com/articles/java-8-permgen-metaspace, Java 8 has higher heap space usage use to removing PermGen space:
Java heap space impact: "Some miscellaneous data has been moved to the Java heap space"
You can adjust the memory allocation for the JVM process by modifying the value for "-Xmx" in the file "jtestcli.jvm" located in the directory "[INSTALL DIRECTORY]/etc/". Example:
g = Gigabyte
m = Megabyte
These steps can also be applied to the other DTP Engines. Just look in the installation directory for the directory "etc" and in there will be a file listed as "[DTP Engine]cli.jvm" and this is were you can set the Java Memory for other DTP Engines.1