Mercurial > hg > truffle
view test/gc/g1/TestHumongousShrinkHeap.java @ 20424:63bae08b051e
8057643: Unable to build --with-debug-level=optimized on OSX
Summary: Added missing Hotspot make targets for 'optimized' build.
Reviewed-by: iveresov
author | kvn |
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date | Thu, 04 Sep 2014 23:49:17 -0700 |
parents | b1266b08b994 |
children | 9b8bd21b6823 |
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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 TestHumongousShrinkHeap * @bug 8036025 8056043 * @summary Verify that heap shrinks after GC in the presence of fragmentation due to humongous objects * @library /testlibrary * @run main/othervm -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=50 -XX:+UseG1GC -XX:G1HeapRegionSize=1M -verbose:gc TestHumongousShrinkHeap */ import java.lang.management.ManagementFactory; import java.lang.management.MemoryUsage; import java.util.ArrayList; import java.util.List; import sun.management.ManagementFactoryHelper; import static com.oracle.java.testlibrary.Asserts.*; public class TestHumongousShrinkHeap { public static final String MIN_FREE_RATIO_FLAG_NAME = "MinHeapFreeRatio"; public static final String MAX_FREE_RATIO_FLAG_NAME = "MaxHeapFreeRatio"; private static final ArrayList<ArrayList<byte[]>> garbage = new ArrayList<>(); private static final int PAGE_SIZE = 1024 * 1024; // 1M private static final int PAGES_NUM = 5; public static void main(String[] args) { new TestHumongousShrinkHeap().test(); } private final void test() { System.gc(); MemoryUsagePrinter.printMemoryUsage("init"); eat(); MemoryUsagePrinter.printMemoryUsage("eaten"); MemoryUsage muFull = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage(); free(); MemoryUsagePrinter.printMemoryUsage("free"); MemoryUsage muFree = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage(); assertLessThan(muFree.getCommitted(), muFull.getCommitted(), String.format( "committed free heap size is not less than committed full heap size, heap hasn't been shrunk?%n" + "%s = %s%n%s = %s", MIN_FREE_RATIO_FLAG_NAME, ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MIN_FREE_RATIO_FLAG_NAME).getValue(), MAX_FREE_RATIO_FLAG_NAME, ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MAX_FREE_RATIO_FLAG_NAME).getValue() )); } private void eat() { int HumongousObjectSize = Math.round(.9f * PAGE_SIZE); System.out.println("Will allocate objects of size=" + MemoryUsagePrinter.humanReadableByteCount(HumongousObjectSize, true)); for (int i = 0; i < PAGES_NUM; i++) { ArrayList<byte[]> stuff = new ArrayList<>(); eatList(stuff, 100, HumongousObjectSize); MemoryUsagePrinter.printMemoryUsage("eat #" + i); garbage.add(stuff); } } private void free() { // do not free last one list garbage.subList(0, garbage.size() - 1).clear(); // do not free last one element from last list ArrayList stuff = garbage.get(garbage.size() - 1); stuff.subList(0, stuff.size() - 1).clear(); System.gc(); } private static void eatList(List garbage, int count, int size) { for (int i = 0; i < count; i++) { garbage.add(new byte[size]); } } } /** * Prints memory usage to standard output */ class MemoryUsagePrinter { public static String humanReadableByteCount(long bytes, boolean si) { int unit = si ? 1000 : 1024; if (bytes < unit) { return bytes + " B"; } int exp = (int) (Math.log(bytes) / Math.log(unit)); String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1) + (si ? "" : "i"); return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre); } public static void printMemoryUsage(String label) { MemoryUsage memusage = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage(); float freeratio = 1f - (float) memusage.getUsed() / memusage.getCommitted(); System.out.format("[%-24s] init: %-7s, used: %-7s, comm: %-7s, freeRatio ~= %.1f%%%n", label, humanReadableByteCount(memusage.getInit(), true), humanReadableByteCount(memusage.getUsed(), true), humanReadableByteCount(memusage.getCommitted(), true), freeratio * 100 ); } }