private static void clearVarTypes() {
        final Map<String, Object> m = COMPILE_OPTIONS.get();
        if (m.containsKey(COMPILE_OPTIONS_VAR_TYPES))
            ((Map<String, ClassNode>) m.get(COMPILE_OPTIONS_VAR_TYPES)).clear();
    }
Gets the total number of nanoseconds that the cache spent compiling scripts.
gremlin-groovy/src/main/java/org/apache/tinkerpop/gremlin/groovy/jsr223/GremlinGroovyScriptEngine.java