changeset 29682:5e1737bfb1bb

8026047: [TESTBUG] add regression test for DisableExplicitGC flag Reviewed-by: jwilhelm, brutisso Contributed-by: Michail Chernov <michail.chernov@oracle.com>
author iignatyev
date Fri, 13 Mar 2015 17:47:34 +0400
parents e5203ed6d805
children 7675ca064fdc
files hotspot/test/gc/TestDisableExplicitGC.java
diffstat 1 files changed, 54 insertions(+), 0 deletions(-) [+]
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/gc/TestDisableExplicitGC.java	Fri Mar 13 17:47:34 2015 +0400
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2015, 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 TestDisableExplicitGC
+ * @requires vm.opt.DisableExplicitGC == null
+ * @summary Verify GC behavior with DisableExplicitGC flag.
+ * @library /testlibrary
+ * @run main/othervm                             -XX:+PrintGCDetails TestDisableExplicitGC
+ * @run main/othervm/fail -XX:+DisableExplicitGC -XX:+PrintGCDetails TestDisableExplicitGC
+ * @run main/othervm      -XX:-DisableExplicitGC -XX:+PrintGCDetails TestDisableExplicitGC
+ */
+import java.lang.management.GarbageCollectorMXBean;
+import java.util.List;
+import static com.oracle.java.testlibrary.Asserts.*;
+
+public class TestDisableExplicitGC {
+
+    public static void main(String[] args) throws InterruptedException {
+        List<GarbageCollectorMXBean> list = java.lang.management.ManagementFactory.getGarbageCollectorMXBeans();
+        long collectionCountBefore = getCollectionCount(list);
+        System.gc();
+        long collectionCountAfter = getCollectionCount(list);
+        assertLT(collectionCountBefore, collectionCountAfter);
+    }
+
+    private static long getCollectionCount(List<GarbageCollectorMXBean> list) {
+        int collectionCount = 0;
+        for (GarbageCollectorMXBean gcMXBean : list) {
+            collectionCount += gcMXBean.getCollectionCount();
+        }
+        return collectionCount;
+    }
+}