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/*
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* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test TestSmallHeap
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* @bug 8067438
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* @requires vm.gc=="null"
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* @summary Verify that starting the VM with a small heap works
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* @run main/othervm -Xmx4m -XX:+UseParallelGC TestSmallHeap
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* @run main/othervm -Xmx4m -XX:+UseSerialGC TestSmallHeap
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* @run main/othervm -Xmx4m -XX:+UseG1GC TestSmallHeap
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* @run main/othervm -Xmx4m -XX:+UseConcMarkSweepGC -XX:CMSMarkStackSizeMax=1032 TestSmallHeap
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*
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* Note: It would be nice to verify the minimal supported heap size here,
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* but that turns out to be quite tricky since we align the heap size based
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* on the card table size. And the card table size is aligned based on the
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* minimal pages size provided by the os. This means that on most platforms,
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* where the minimal page size is 4k, we get a minimal heap size of 2m but
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* on Solaris/Sparc we have a page size of 8k and get a minimal heap size
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* of 8m.
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* There is also no check in the VM for verifying that the maximum heap size
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* is larger than the supported minimal heap size. This means that specifying
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* -Xmx1m on the command line is fine but will give a heap of 2m (or 4m).
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* To work around these rather strange behaviors this test uses 4m for all
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* platforms.
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*/
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import sun.management.ManagementFactoryHelper;
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import static com.oracle.java.testlibrary.Asserts.*;
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public class TestSmallHeap {
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public static void main(String[] args) {
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String maxHeap = ManagementFactoryHelper.getDiagnosticMXBean().getVMOption("MaxHeapSize").getValue();
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String expectedMaxHeap = "4194304";
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assertEQ(maxHeap, expectedMaxHeap);
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}
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}
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