--- old/test/hotspot/jtreg/gc/arguments/TestAggressiveHeap.java	2018-05-15 10:54:30.785398146 +0200
+++ new/test/hotspot/jtreg/gc/arguments/TestAggressiveHeap.java	2018-05-15 10:54:30.473385800 +0200
@@ -53,13 +53,18 @@
     // Option requires at least 256M, else error during option processing.
     private static final long minMemory = 256 * 1024 * 1024;
 
+    // Setting the heap to half of the physical memory is not suitable for
+    // a test environment with many tests running concurrently, setting to
+    // half of the required size instead.
+    private static final String heapSizeOption = "-Xmx128M";
+
     // bool UseParallelGC = true {product} {command line}
     private static final String parallelGCPattern =
         " *bool +UseParallelGC *= *true +\\{product\\} *\\{command line\\}";
 
     private static void testFlag() throws Exception {
         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
-            option, "-XX:+PrintFlagsFinal", "-version");
+            option, heapSizeOption, "-XX:+PrintFlagsFinal", "-version");
 
         OutputAnalyzer output = new OutputAnalyzer(pb.start());