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annotate test/gc/arguments/TestG1HeapRegionSize.java @ 20543:e7d0505c8a30

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8059758: Footprint regressions with JDK-8038423 Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything. Reviewed-by: jwilhelm, brutisso
author tschatzl
date Fri, 10 Oct 2014 15:51:58 +0200
parents dae8324fc7d1
children
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1 /*
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /*
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25 * @test TestG1HeapRegionSize
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26 * @key gc
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27 * @bug 8021879
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28 * @summary Verify that the flag G1HeapRegionSize is updated properly
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29 * @run main/othervm -Xmx64m TestG1HeapRegionSize 1048576
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30 * @run main/othervm -XX:G1HeapRegionSize=2m -Xmx64m TestG1HeapRegionSize 2097152
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31 * @run main/othervm -XX:G1HeapRegionSize=3m -Xmx64m TestG1HeapRegionSize 2097152
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32 * @run main/othervm -XX:G1HeapRegionSize=64m -Xmx256m TestG1HeapRegionSize 33554432
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33 */
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34
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35 import sun.management.ManagementFactoryHelper;
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36 import com.sun.management.HotSpotDiagnosticMXBean;
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37 import com.sun.management.VMOption;
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38
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39 public class TestG1HeapRegionSize {
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40
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41 public static void main(String[] args) {
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42 HotSpotDiagnosticMXBean diagnostic = ManagementFactoryHelper.getDiagnosticMXBean();
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43
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44 VMOption option = diagnostic.getVMOption("UseG1GC");
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45 if (option.getValue().equals("false")) {
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46 System.out.println("Skipping this test. It is only a G1 test.");
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47 return;
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48 }
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49
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50 String expectedValue = getExpectedValue(args);
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51 option = diagnostic.getVMOption("G1HeapRegionSize");
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52 if (!expectedValue.equals(option.getValue())) {
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53 throw new RuntimeException("Wrong value for G1HeapRegionSize. Expected " + expectedValue + " but got " + option.getValue());
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54 }
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55 }
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56
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57 private static String getExpectedValue(String[] args) {
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58 if (args.length != 1) {
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59 throw new RuntimeException("Wrong number of arguments. Expected 1 but got " + args.length);
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60 }
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61 return args[0];
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62 }
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63
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64 }