--- old/hotspot/test/Makefile	2017-08-28 10:31:36.478403668 -0400
+++ new/hotspot/test/Makefile	2017-08-28 10:31:35.206330788 -0400
@@ -70,8 +70,8 @@
   CONCURRENCY := 12
 endif
 
-# Make sure MaxRAMFraction is high enough to not cause OOM or swapping since we may end up with a lot of JVM's
-JTREG_BASIC_OPTIONS += -vmoption:-XX:MaxRAMFraction=$(shell expr $(CONCURRENCY) \* 4)
+# Make sure MaxRAMPercentage is high enough to not cause OOM or swapping since we may end up with a lot of JVM's
+JTREG_BASIC_OPTIONS += -vmoption:-XX:MaxRAMPercentage=$(shell expr 25 / $(CONCURRENCY))
 
 # Include the common base file with most of the logic
 include ../../test/TestCommon.gmk