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162 lines
7.4 KiB
Java
162 lines
7.4 KiB
Java
/*
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* Copyright (c) 2014, 2024, Alibaba Group Holding Limited. All rights reserved.
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* Copyright (c) 2024, 2025, Red Hat Inc.
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* Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package gc;
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/**
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* @test id=ParallelCollector
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* @summary tests AlwaysPreTouch
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* @requires vm.gc.Parallel
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* @requires os.maxMemory > 2G
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* @requires !vm.debug
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* @requires os.family == "linux"
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* @library /test/lib
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmx256m -Xms256m -XX:+UseParallelGC -XX:+AlwaysPreTouch gc.TestAlwaysPreTouchBehavior
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*/
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/**
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* @test id=SerialCollector
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* @summary tests AlwaysPreTouch
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* @requires vm.gc.Serial
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* @requires os.maxMemory > 2G
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* @requires !vm.debug
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* @requires os.family == "linux"
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* @library /test/lib
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmx256m -Xms256m -XX:+UseSerialGC -XX:+AlwaysPreTouch gc.TestAlwaysPreTouchBehavior
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*/
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/**
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* @test id=Shenandoah
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* @summary tests AlwaysPreTouch
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* @requires vm.gc.Shenandoah
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* @requires os.maxMemory > 2G
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* @requires !vm.debug
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* @requires os.family == "linux"
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* @library /test/lib
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmx256m -Xms256m -XX:+UseShenandoahGC -XX:+AlwaysPreTouch gc.TestAlwaysPreTouchBehavior
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*/
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/**
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* @test id=G1
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* @summary tests AlwaysPreTouch
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* @requires vm.gc.G1
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* @requires os.maxMemory > 2G
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* @requires !vm.debug
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* @requires os.family == "linux"
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* @library /test/lib
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmx256m -Xms256m -XX:+AlwaysPreTouch gc.TestAlwaysPreTouchBehavior
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*/
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/**
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* @test id=Z
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* @summary tests AlwaysPreTouch
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* @requires vm.gc.Z
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* @requires os.maxMemory > 2G
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* @requires !vm.debug
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* @requires os.family == "linux"
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* @library /test/lib
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseZGC -Xmx256m -Xms256m -XX:+AlwaysPreTouch gc.TestAlwaysPreTouchBehavior
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*/
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/**
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* @test id=Epsilon
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* @summary tests AlwaysPreTouch
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* @requires vm.gc.Epsilon
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* @requires os.maxMemory > 2G
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* @requires !vm.debug
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* @requires os.family == "linux"
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* @library /test/lib
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -Xmx256m -Xms256m -XX:+AlwaysPreTouch gc.TestAlwaysPreTouchBehavior
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*/
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import jdk.test.lib.Asserts;
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import jdk.test.whitebox.WhiteBox;
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import jtreg.SkippedException;
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public class TestAlwaysPreTouchBehavior {
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//
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// This test tests the ability of the JVM to pretouch its java heap for test purposes (AlwaysPreTouch). We start a
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// JVM with -XX:+AlwaysPreTouch, then observe RSS and expect to see RSS covering the entirety of the java heap,
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// since it should all be pre-touched now.
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//
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// This test is important (we had pretouching break before) but very shaky since RSS of the JVM process is subject to
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// host machine conditions. If there is memory pressure, we may swap parts of the heap out after pretouching and
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// before measuring RSS, thus tainting the result.
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//
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// This test attempts to minimize the risk of false positives stemming from memory pressure by:
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// - specifying @requires os.maxMemory > 2G
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// - checking if the memory still available on the host machine after starting the process is lower than a
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// certain required threshold; if it is, we take this as a sign of memory pressure and disregard test errors.
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// - we only run this test with release JVMs - debug JVMs have a higher and more unpredictable RSS footprint
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// and therefore would require a larger heap for a clear difference between non-pretouch and pretouch; also,
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// there should not be much difference between debug and release code.
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//
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// Obviously, all of this is not bulletproof and only useful on Linux:
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// - On MacOS, os::available_memory() drastically underreports available memory, so this technique would almost
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// always fail to function
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// - On AIX, we dont have a way to measure rss yet.
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//
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public static void main(String [] args) {
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long rss = WhiteBox.getWhiteBox().rss();
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System.out.println("RSS: " + rss);
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long available = WhiteBox.getWhiteBox().hostAvailableMemory();
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System.out.println("Host available memory: " + available);
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long heapSize = 256 * 1024 * 1024;
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// On Linux, a JVM that runs with 256M pre-committed heap will use about 60MB (release JVM) RSS. Barring
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// memory pressure that causes us to lose RSS, pretouching should increase RSS to >256MB. So there should be a
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// clear distinction between non-pretouched and pretouched.
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long minRequiredRss = heapSize;
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// The minimum required available memory size to count test errors as errors (to somewhat safely disregard
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// outside memory pressure as the culprit). We are over-cautious and require at least 1G free. We rather err
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// on the side of disregarding true errors than to produce false positives (if pretouching is broken, at least
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// some of the runs of this test will run on beefy enough machines and show the test as failed).
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long requiredAvailable = 1024 * 1024 * 1024;
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if (rss == 0) {
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throw new SkippedException("cannot get RSS?");
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}
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if (available > requiredAvailable) {
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Asserts.assertGreaterThan(rss, minRequiredRss, "RSS of this process(" + rss + "b) should be bigger " +
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"than or equal to heap size(" + heapSize + "b) (available memory: " + available + "). On Linux Kernel < 4.14 RSS can be inaccurate");
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}
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}
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}
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