changeset 3772:9a344d88dc22

7168848: Add test to check that humongous object allocation path also checks the heap occupancy. Summary: Added test that checks humongous object allocation path also check the heap occupancy and initiate a marking cycle when / if needed. Reviewed-by: brutisso, jwilhelm
author mnunez
date Mon, 21 May 2012 14:59:59 +0200
parents c92a79900986
children 1d478c993020
files test/gc/7168848/HumongousAlloc.java
diffstat 1 files changed, 74 insertions(+), 0 deletions(-) [+]
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/gc/7168848/HumongousAlloc.java	Mon May 21 14:59:59 2012 +0200
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test Humongous.java
+ * @bug 7168848
+ * @summary G1: humongous object allocations should initiate marking cycles when necessary
+ * @run main/othervm -Xms100m -Xmx100m -XX:+PrintGC -XX:G1HeapRegionSize=1m -XX:+UseG1GC  HumongousAlloc
+ *
+ */
+import java.lang.management.GarbageCollectorMXBean;
+import java.lang.management.ManagementFactory;
+import java.util.List;
+
+public class HumongousAlloc {
+
+    public static byte[] dummy;
+    private static int sleepFreq = 40;
+    private static int sleepTime = 1000;
+    private static double size = 0.75;
+    private static int iterations = 50;
+    private static int MB = 1024 * 1024;
+
+    public static void allocate(int size, int sleepTime, int sleepFreq) throws InterruptedException {
+        System.out.println("Will allocate objects of size: " + size
+                + " bytes and sleep for " + sleepTime
+                + " ms after every " + sleepFreq + "th allocation.");
+        int count = 0;
+        while (count < iterations) {
+            for (int i = 0; i < sleepFreq; i++) {
+                dummy = new byte[size - 16];
+            }
+            Thread.sleep(sleepTime);
+            count++;
+        }
+    }
+
+    public static void main(String[] args) throws InterruptedException {
+        allocate((int) (size * MB), sleepTime, sleepFreq);
+        List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans();
+        for (GarbageCollectorMXBean collector : collectors) {
+            if (collector.getName().contains("G1 Old")) {
+               long count = collector.getCollectionCount();
+                if (count > 0) {
+                    throw new RuntimeException("Failed: FullGCs should not have happened. The number of FullGC run is " + count);
+                }
+                else {
+                    System.out.println("Passed.");
+                }
+            }
+        }
+    }
+}
+