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8067438: Add test to verify minimal heap size

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Reviewed-by: dfazunen, ehelin
This commit is contained in:
Bengt Rutisson 2014-12-17 09:47:14 +01:00
parent 3e9edcd457
commit eec8524e84
1 changed files with 58 additions and 0 deletions

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hotspot/test/gc/TestSmallHeap.java Normal file

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/*
* Copyright (c) 2014, 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 TestSmallHeap
* @bug 8067438
* @requires vm.gc=="null"
* @summary Verify that starting the VM with a small heap works
* @run main/othervm -Xmx4m -XX:+UseParallelGC TestSmallHeap
* @run main/othervm -Xmx4m -XX:+UseSerialGC TestSmallHeap
* @run main/othervm -Xmx4m -XX:+UseG1GC TestSmallHeap
* @run main/othervm -Xmx4m -XX:+UseConcMarkSweepGC -XX:CMSMarkStackSizeMax=1032 TestSmallHeap
*
* Note: It would be nice to verify the minimal supported heap size here,
* but that turns out to be quite tricky since we align the heap size based
* on the card table size. And the card table size is aligned based on the
* minimal pages size provided by the os. This means that on most platforms,
* where the minimal page size is 4k, we get a minimal heap size of 2m but
* on Solaris/Sparc we have a page size of 8k and get a minimal heap size
* of 8m.
* There is also no check in the VM for verifying that the maximum heap size
* is larger than the supported minimal heap size. This means that specifying
* -Xmx1m on the command line is fine but will give a heap of 2m (or 4m).
* To work around these rather strange behaviors this test uses 4m for all
* platforms.
*/
import sun.management.ManagementFactoryHelper;
import static com.oracle.java.testlibrary.Asserts.*;
public class TestSmallHeap {
public static void main(String[] args) {
String maxHeap = ManagementFactoryHelper.getDiagnosticMXBean().getVMOption("MaxHeapSize").getValue();
String expectedMaxHeap = "4194304";
assertEQ(maxHeap, expectedMaxHeap);
}
}