russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
123 lines
4.7 KiB
Java
123 lines
4.7 KiB
Java
/*
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* Copyright Amazon.com Inc. 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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*/
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/**
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* @test id=satb-adaptive
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* @requires vm.gc.Shenandoah
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* @library /test/lib
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* @bug 8372543
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* @summary When soft max heap size < Xmx, we had a bug reported in JBS-8372543 where available size was undercalculated.
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* This caused excessive GC runs.
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*
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* @run main/othervm -XX:SoftMaxHeapSize=512m -Xmx2g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
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* -XX:+UseShenandoahGC -Xlog:gc=info
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* -XX:ShenandoahGCMode=satb
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* -XX:+ShenandoahDegeneratedGC
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* -XX:ShenandoahGCHeuristics=adaptive
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* TestSoftMaxHeapSizeAvailableCalc
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*/
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/**
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* @test id=satb-static
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* @requires vm.gc.Shenandoah
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* @library /test/lib
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*
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* @run main/othervm -XX:SoftMaxHeapSize=512m -Xmx2g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
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* -XX:+UseShenandoahGC -Xlog:gc=info
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* -XX:ShenandoahGCMode=satb
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* -XX:+ShenandoahDegeneratedGC
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* -XX:ShenandoahGCHeuristics=static
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* TestSoftMaxHeapSizeAvailableCalc
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*/
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/**
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* @test id=generational
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* @requires vm.gc.Shenandoah
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* @library /test/lib
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*
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* @run main/othervm -XX:SoftMaxHeapSize=512m -Xmx2g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
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* -XX:+UseShenandoahGC -Xlog:gc=info
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* -XX:ShenandoahGCMode=generational
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* -XX:ShenandoahGCHeuristics=adaptive
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* TestSoftMaxHeapSizeAvailableCalc
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*
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*/
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import java.lang.management.ManagementFactory;
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import jdk.test.lib.Asserts;
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import jdk.test.lib.Utils;
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.process.ProcessTools;
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import jdk.test.lib.dcmd.PidJcmdExecutor;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import java.util.Random;
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import com.sun.management.GarbageCollectorMXBean;
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public class TestSoftMaxHeapSizeAvailableCalc {
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public static void main(String[] args) throws Exception {
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Allocate.test();
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}
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// This test runs an app that has a stable heap of ~300M and allocates temporary garbage at ~100M/s
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// Soft max: 512M, ShenandoahMinFreeThreshold: 10 (default), ShenandoahEvacReserve: 5 (default)
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// Soft max for mutator: 512M * (100.0 - 5) / 100 = 486.4M
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// Threshold to trigger gc: 486.4M - 512 * 10 / 100.0 = 435.2M, just above (300 + 100)M.
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// Expect gc count to be less than 1 / sec.
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public static class Allocate {
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static final List<byte[]> longLived = new ArrayList<>();
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public static void test() throws Exception {
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final int expectedMaxGcCount = Integer.getInteger("expectedMaxGcCount", 30);
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List<java.lang.management.GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans();
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java.lang.management.GarbageCollectorMXBean cycleCollector = null;
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for (java.lang.management.GarbageCollectorMXBean bean : collectors) {
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if (bean.getName().contains("Cycles")) {
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cycleCollector = bean;
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}
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}
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// Allocate ~300MB of long-lived objects
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for (int i = 0; i < 300; i++) {
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longLived.add(new byte[1_000_000]);
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}
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// allocate short-lived garbage to the heap
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long end = System.currentTimeMillis() + 30_000; // 30 seconds
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while (System.currentTimeMillis() < end) {
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byte[] garbage = new byte[1_000_000];
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garbage[0] = 1; // prevent optimization
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Thread.sleep(10); // Pace to generate garbage at speed of ~100M/s
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}
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long gcCount = cycleCollector.getCollectionCount();
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Asserts.assertLessThan(gcCount, (long) expectedMaxGcCount, "GC was triggered too many times. Expected to be less than: " + expectedMaxGcCount + ", triggered: " + gcCount);
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}
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}
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}
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