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/*
* Copyright (c) 2012, 2013, 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 TestHumongousAllocInitialMark
* @bug 7168848
* @summary G1: humongous object allocations should initiate marking cycles when necessary
* @library /testlibrary
*/
import com.oracle.java.testlibrary.*;
public class TestHumongousAllocInitialMark {
private static final int heapSize = 200; // MB
private static final int heapRegionSize = 1; // MB
private static final int initiatingHeapOccupancyPercent = 50; // %
public static void main(String[] args) throws Exception {
ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
"-XX:+UseG1GC",
"-Xms" + heapSize + "m",
"-Xmx" + heapSize + "m",
"-XX:G1HeapRegionSize=" + heapRegionSize + "m",
"-XX:InitiatingHeapOccupancyPercent=" + initiatingHeapOccupancyPercent,
"-XX:+PrintGC",
HumongousObjectAllocator.class.getName());
OutputAnalyzer output = new OutputAnalyzer(pb.start());
output.shouldContain("GC pause (G1 Humongous Allocation) (young) (initial-mark)");
output.shouldNotContain("Full GC");
output.shouldHaveExitValue(0);
}
static class HumongousObjectAllocator {
private static byte[] dummy;
public static void main(String [] args) throws Exception {
// Make object size 75% of region size
final int humongousObjectSize =
(int)(heapRegionSize * 1024 * 1024 * 0.75);
// Number of objects to allocate to go above IHOP
final int humongousObjectAllocations =
(int)((heapSize * initiatingHeapOccupancyPercent / 100.0) / heapRegionSize) + 1;
// Allocate
for (int i = 1; i <= humongousObjectAllocations; i++) {
System.out.println("Allocating humongous object " + i + "/" + humongousObjectAllocations +
" of size " + humongousObjectSize + " bytes");
dummy = new byte[humongousObjectSize];
}
}
}
}
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