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Datei: TestSmallHeap.java Sprache: JAVA

/*
* Copyright (c) 2019, 2020, 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.
*/

package gc.z;

/*
* @test TestSmallHeap
* @requires vm.gc.Z
* @summary Test ZGC with small heaps
* @library / /test/lib
* @run driver gc.z.TestSmallHeap 8M 16M 32M 64M 128M 256M 512M 1024M
*/

import jdk.test.lib.process.ProcessTools;
import static gc.testlibrary.Allocation.blackHole;

public class TestSmallHeap {
    public static class Test {
        public static void main(String[] args) throws Exception {
            final long maxCapacity = Runtime.getRuntime().maxMemory();
            System.out.println("Max Capacity " + maxCapacity + " bytes");

            // Allocate byte arrays of increasing length, so that
            // all allocation paths (small/medium/large) are tested.
            for (int length = 16; length <= maxCapacity / 16; length *= 2) {
                System.out.println("Allocating " + length + " bytes");
                blackHole(new byte[length]);
            }

            System.out.println("Success");
        }
    }

    public static void main(String[] args) throws Exception {
        for (var maxCapacity: args) {
            ProcessTools.executeProcess(ProcessTools.createJavaProcessBuilder(
                                        "-XX:+UseZGC",
                                        "-Xlog:gc,gc+init,gc+reloc,gc+heap",
                                        "-Xmx" + maxCapacity,
                                        Test.class.getName()))
                .outputTo(System.out)
                .errorTo(System.out)
                .shouldContain("Success")
                .shouldHaveExitValue(0);
        }
    }
}

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