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| * Copyright (c) 2021, 2021 IBM Corp. and others | ||
| * | ||
| * This program and the accompanying materials are made | ||
| * available under the terms of the Eclipse Public License 2.0 | ||
| * which accompanies this distribution and is available at | ||
| * https://www.eclipse.org/legal/epl-2.0/ or the Apache | ||
| * License, Version 2.0 which accompanies this distribution and | ||
| * is available at https://www.apache.org/licenses/LICENSE-2.0. | ||
| * | ||
| * This Source Code may also be made available under the | ||
| * following Secondary Licenses when the conditions for such | ||
| * availability set forth in the Eclipse Public License, v. 2.0 | ||
| * are satisfied: GNU General Public License, version 2 with | ||
| * the GNU Classpath Exception [1] and GNU General Public | ||
| * License, version 2 with the OpenJDK Assembly Exception [2]. | ||
| * | ||
| * [1] https://www.gnu.org/software/classpath/license.html | ||
| * [2] http://openjdk.java.net/legal/assembly-exception.html | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH | ||
| * Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception | ||
| --> | ||
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| # Eclipse OpenJ9 version 0.27.1 release notes | ||
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| These release notes support the [Eclipse OpenJ9 0.27.1 release plan](https://projects.eclipse.org/projects/technology.openj9/releases/0.27.1/plan). | ||
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| ## Supported environments | ||
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| OpenJ9 release 0.27.1 supports OpenJDK 8, 11, and 16. | ||
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| All releases are tested against the OpenJ9 functional verification (FV) test suite, the OpenJDK test suites, and additional tests at AdoptOpenJDK. | ||
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| To learn more about support for OpenJ9 releases, including OpenJDK levels and platform support, see [Supported environments](https://eclipse.org/openj9/docs/openj9_support/index.html). | ||
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| ## Notable changes in this release | ||
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| The following table covers notable changes in v0.27.1. Further information about these changes can be found in the [user documentation](https://www.eclipse.org/openj9/docs/version0.27/). | ||
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| <table cellpadding="4" cellspacing="0" summary="" width="100%" rules="all" frame="border" border="1"><thead align="left"> | ||
| <tr valign="bottom"> | ||
| <th valign="bottom">Issue number</th> | ||
| <th valign="bottom">Description</th> | ||
| <th valign="bottom">Version / Platform</th> | ||
| <th valign="bottom">Impact</th> | ||
| </tr> | ||
| </thead> | ||
| <tbody> | ||
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| <tr><td valign="top"> | ||
| <a href="https://github.com/eclipse-openj9/openj9/issues/11999">#11999</a></td> | ||
| <td valign="top">New <strong>-XX:[+|-]AdaptiveGCThreading</strong> option added</td> | ||
| <td valign="top">All versions</td> | ||
| <td valign="top">Adaptive threading is enabled by default, which automatically tunes the number of active parallel garbage collection (GC) threads.</td> | ||
| </tr> | ||
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| <tr><td valign="top"> | ||
| <a href="https://github.com/eclipse-openj9/openj9/pull/12437">#12437</a></td> | ||
| <td valign="top">Improved time zone information added to Java dump files</td> | ||
| <td valign="top">All versions</td> | ||
| <td valign="top">Two new fields are included, the date and time in UTC (<strong>1TIDATETIMEUTC</strong>) and the time zone according to the local system (<strong>1TITIMEZONE</strong>).</td> | ||
| </tr> | ||
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| <tr><td valign="top"> | ||
| <a href="https://github.com/eclipse/openj9/issues/7552">#7552</a></td> | ||
| <td valign="top">New default garbage collection (GC) scan ordering mode for the <tt>balanced</tt> policy</td> | ||
| <td valign="top">All versions</td> | ||
| <td valign="top">For performance improvements, GC copy forward operations in the <tt>balanced</tt> policy now use <i>dynamic breadth first scan mode</i>. To revert to the behavior in earlier releases, set <tt>-Xgc:breadthFirstScanOrdering</tt> on the command line when you start your application.</td> | ||
| </tr> | ||
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| <tr><td valign="top"> | ||
| <a href="https://github.com/eclipse/openj9/pull/12810">#12810</a></td> | ||
| <td valign="top">Stop parsing the <tt>JAVA_OPTIONS</tt> environment variable</td> | ||
| <td valign="top">All versions</td> | ||
| <td valign="top">The 0.24 release started parsing the <tt>JAVA_OPTIONS</tt> environment variable. This variable was added in error and has been removed. | ||
| The <tt>_JAVA_OPTIONS</tt> environment variable (with different behavior) is added for compatibility.</td> | ||
| </tr> | ||
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| <tr><td valign="top"> | ||
| <a href="https://github.com/eclipse-openj9/openj9/pull/12501">#12501</a></td> | ||
| <td valign="top">Increase operating system stack size on PPC64 platforms</td> | ||
| <td valign="top">All JDK versions, AIX and Linux PPC64</td> | ||
| <td valign="top">The increased stack size leaves more room to store vector registers for internal linkage conventions. Note: This change increases the overall memory usage of the VM. You can change the stack size by using the -Xmso option.</td> | ||
| </tr> | ||
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| <tr><td valign="top"> | ||
| <a href="https://github.com/eclipse-openj9/openj9/issues/12125">#12125</a></td> | ||
| <td valign="top">Global lock reservation is now enabled by default on Power</td> | ||
| <td valign="top">AIX and Linux on Power</td> | ||
| <td valign="top">Global lock reservation is now enabled by default on Power. This is an optimization targeted towards more efficient handling of locking and unlocking Java™ objects. The older locking behavior can be restored via the <tt>-XX:-GlobalLockReservation</tt> option.</td> | ||
| </tr> | ||
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| <tr><td valign="top"> | ||
| <a href="https://github.com/eclipse-openj9/openj9/issues/13194">#13194</a></td> | ||
| <td valign="top">New option recognized by <tt>jpackcore</tt> / <tt>jextract</tt></td> | ||
| <td valign="top">All versions</td> | ||
| <td valign="top">The new option, <tt>-x</tt>, causes the system dump to be omitted from the archive created. In its place, the file <tt>excluded-files.txt</tt> is added which names the excluded file.</td> | ||
| </tr> | ||
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| </tbody> | ||
| </table> | ||
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| ## Known Issues | ||
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| The v0.27.1 release contains the following known issues and limitations: | ||
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| <table cellpadding="4" cellspacing="0" summary="" width="100%" rules="all" frame="border" border="1"> | ||
| <thead align="left"> | ||
| <tr valign="bottom"> | ||
| <th valign="bottom">Issue number</th> | ||
| <th valign="bottom">Description</th> | ||
| <th valign="bottom">Platform</th> | ||
| <th valign="bottom">Impact</th> | ||
| <th valign="bottom">Workaround</th> | ||
| </tr> | ||
| </thead> | ||
| <tbody> | ||
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| <tr><td valign="top"><a href="https://github.com/eclipse-openj9/openj9/issues/8034">#8034</a></td> | ||
| <td valign="top">Balanced garbage collection policy not supported</td> | ||
| <td valign="top">Linux on 64-bit ARM (AArch64)</td> | ||
| <td valign="top">The Balanced GC policy cannot be used. </td> | ||
| <td valign="top">Use an alternative GC policy, such as <tt>gencon</tt>.</td> | ||
| </tr> | ||
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| </tbody> | ||
| </table> | ||
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| ## Other changes | ||
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| A full commit history for this release is available at [Eclipse OpenJ9 v0.27.1](https://github.com/eclipse-openj9/openj9/releases/tag/openj9-0.27.1). |