add .jvmopts

.jvmopts

@@ -0,0 +1,12 @@
+# see https://weblogs.java.net/blog/kcpeppe/archive/2013/12/11/case-study-jvm-hotspot-flags
+-Dfile.encoding=UTF8
+-Xms1G
+-Xmx3G
+-XX:MaxPermSize=512M
+-XX:ReservedCodeCacheSize=250M
+-XX:+TieredCompilation
+-XX:-UseGCOverheadLimit
+# effectively adds GC to Perm space
+-XX:+CMSClassUnloadingEnabled
+# must be enabled for CMSClassUnloadingEnabled to work
+-XX:+UseConcMarkSweepGC