Mercurial > hg > truffle
view test/compiler/6852078/Test6852078.java @ 1887:cd3ef3fd20dd
6992998: CMSWaitDuration=0 causes hangs with +ExplicitGCInvokesConcurrent
Summary: Closed a timing hole during which concurrent full gc requests can be missed. The hole can increase the latency of the response to a full gc request by up to the value of CMSWaitDuration. If CMSWaitDuration=0 is, as currently, interpreted as an unbounded wait, suitable in certain tuning scenarios, the application can potentially hang. Made two obscure tunables, including CMSWaitDuration, manageable.
Reviewed-by: jcoomes, tonyp
author | ysr |
---|---|
date | Thu, 21 Oct 2010 17:29:24 -0700 |
parents | c18cbe5936b8 |
children | a00ed9736260 |
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/* * Copyright (c) 2009, 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 * @bug 6852078 * @summary Disable SuperWord optimization for unsafe read/write * * @run main/othervm Test6852078 */ import java.util.*; import java.nio.ByteBuffer; import com.sun.corba.se.impl.encoding.ByteBufferWithInfo; import com.sun.jndi.toolkit.corba.CorbaUtils; public class Test6852078 { public Test6852078(String [] args) { int capacity = 128; ByteBuffer bb = ByteBuffer.allocateDirect(capacity); ByteBufferWithInfo bbwi = new ByteBufferWithInfo( CorbaUtils.getOrb(null, -1, new Hashtable()), bb); byte[] tmpBuf; tmpBuf = new byte[bbwi.buflen]; for (int i = 0; i < capacity; i++) tmpBuf[i] = bbwi.byteBuffer.get(i); } public static void main(String [] args) { for (int i=0; i<2000; i++) { Test6852078 t = new Test6852078(args); } } }