| /* |
| * Copyright (c) 2013, 2018, 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. |
| */ |
| |
| package metaspace.gc; |
| |
| import java.io.IOException; |
| import java.lang.management.ManagementFactory; |
| import java.lang.management.MemoryPoolMXBean; |
| import java.lang.management.MemoryUsage; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Proxy; |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.nio.file.Files; |
| import java.nio.file.Paths; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import jdk.internal.misc.Unsafe; |
| |
| /** |
| * Test that checks how GC works with Metaspace and "Compared Class Space". |
| * |
| * It comprises 3 test cases: |
| * <ul> |
| * <li>testcase1 - checks that used/committed memory doesn't grow |
| * when gc is invoked</li> |
| * <li>testcase2 - checks that gc is invoked when the class metadata u |
| * sage reaches MetaspaceSize</li> |
| * <li>testcase3 - checks used/committed grow, inspite of gc is invoked</li> |
| * </ul> |
| * |
| * It's supposed that this class will be executed with various setting of VM |
| * flags. Via execute args it's possible to say which test cases to run and |
| * what space to test: Metaspace or Compared Class Space. |
| */ |
| public abstract class MetaspaceBaseGC { |
| |
| // storage of loaded classes |
| private final Map<String, MetaspaceBaseGC.Foo> loadedClasses = new HashMap<>(); |
| private static int counter = 0; |
| |
| // pool to test |
| protected MemoryPoolMXBean pool = null; |
| |
| // memory page size |
| protected static final long PAGE_SIZE = detectPageSize(); |
| |
| // true when PAGE_SIZE is large and |
| protected boolean useLargepages = false; |
| |
| // where the log will be saved |
| protected String gclogFileName = null; |
| |
| protected final Set<String> vmArgs = new HashSet<>(); |
| |
| protected abstract void parseArgs(String args[]); |
| protected abstract String getPoolName(); |
| protected abstract void doCheck(); |
| |
| public final void run(String args[]) { |
| configure(args); |
| if (pool == null) { |
| System.out.println("%%% Cannot pull the pool, most likely 32-bits only"); |
| return; |
| } |
| System.out.println("%%% Working with " + getPoolName()); |
| for (String vmA: vmArgs) { |
| if (vmA.contains("Metaspace") || vmA.contains("Compressed")) { |
| System.out.println("% " + vmA); |
| } |
| } |
| doCheck(); |
| System.out.println("% Test passed."); |
| } |
| |
| |
| protected void configure(String args[]) { |
| vmArgs.addAll(ManagementFactory.getRuntimeMXBean().getInputArguments()); |
| useLargepages = PAGE_SIZE > 1_000_000 && !vmArgs.contains("-XX:-UseLargePagesInMetaspace"); |
| |
| System.out.println(vmArgs); |
| |
| pool = getMemoryPool(getPoolName()); |
| if (pool == null) { |
| return; // nothing to check |
| } |
| for (String arg: vmArgs) { |
| if (arg.startsWith("-Xlog:gc") && arg.length() > 8) { |
| gclogFileName = arg.substring(arg.lastIndexOf(':') + 1); |
| } |
| } |
| parseArgs(args); |
| } |
| |
| |
| /** |
| * Imitates class loading. |
| * Each invocation of this method causes a new class loader object is created |
| * and a new class is loaded by this class loader. |
| * Method throws OOM when run out of memory. |
| * |
| * @param times how many classes to load |
| * @param keepRefs true, if references to created classes should be stored |
| */ |
| protected void loadNewClasses(int times, boolean keepRefs) { |
| for (int i = 0; i < times; i++) { |
| try { |
| String jarUrl = "file:" + counter + ".jar"; |
| counter++; |
| URL[] urls = new URL[]{new URL(jarUrl)}; |
| URLClassLoader cl = new URLClassLoader(urls); |
| MetaspaceBaseGC.Foo foo = (MetaspaceBaseGC.Foo) Proxy.newProxyInstance(cl, |
| new Class[]{MetaspaceBaseGC.Foo.class}, |
| new MetaspaceBaseGC.FooInvocationHandler(new MetaspaceBaseGC.FooBar())); |
| if (keepRefs) { |
| loadedClasses.put(jarUrl, foo); |
| } |
| } catch (java.net.MalformedURLException badThing) { |
| // should never occur |
| System.err.println("Unexpeted error: " + badThing); |
| throw new RuntimeException(badThing); |
| } |
| } |
| |
| } |
| |
| /** |
| * Cleans references to loaded classes. |
| */ |
| protected void cleanLoadedClasses() { |
| loadedClasses.clear(); |
| } |
| |
| /** |
| * Invokes System.gc() and sleeps a little. |
| */ |
| protected void gc() { |
| System.gc(); |
| try { |
| Thread.currentThread().sleep(500); |
| } catch (Exception whatever) { |
| } |
| } |
| |
| /** |
| * Reads gc.log file and returns it as a list of lines. |
| * It's supposed that the test is executed with -Xlog:gc:gc.log option. |
| * |
| * @return List of strings the gc.log file is comprised. |
| * @throws IOException if problem occurred while reading. |
| */ |
| protected List<String> readGCLog() throws IOException { |
| return Files.readAllLines(Paths.get(".", gclogFileName)); |
| } |
| |
| /** |
| * Reads gc.log file and counts GC induced by metaspace. |
| * @return how many times GC induced by metaspace has occurred. |
| */ |
| protected int getMetaspaceGCCount() { |
| int count = 0; |
| try { |
| for (String line: readGCLog()) { |
| if (line.indexOf("Metadata GC ") > 0) { |
| count++; |
| } |
| } |
| return count; |
| } catch (Throwable t) { |
| t.printStackTrace(System.err); |
| return -1; |
| } |
| } |
| |
| protected String lastGCLogLine() { |
| if (gclogFileName == null) { |
| return ""; |
| } |
| try { |
| List<String> list = Files.readAllLines(Paths.get(".", gclogFileName)); |
| return list.get(list.size() - 1); |
| } catch (IOException e) { |
| return "File not found"; |
| } |
| } |
| |
| /** |
| * Does it best to checks if the last GC was caused by metaspace. |
| * |
| * This method looks into gc.log file (if -Xloggc:file is given) and returns |
| * true if the last line in the log contains the "Metadata" word. |
| * It's not very reliable way to check, log might not be flushed yet. |
| * |
| * @return |
| */ |
| protected boolean isMetaspaceGC() { |
| return lastGCLogLine().contains("Metadata"); |
| } |
| |
| /** |
| * Prints amounts of used and committed metaspace preceeded by the message |
| * @param mesg a message to printed prior usages |
| */ |
| protected void printMemoryUsage(String mesg) { |
| MemoryUsage mu = pool.getUsage(); |
| printMemoryUsage(mesg, mu.getUsed(), mu.getCommitted()); |
| } |
| protected void printMemoryUsage(String mesg, long v1, long v2) { |
| System.out.println(mesg + ": " + bytes2k(v1) + " : " + bytes2k(v2)); |
| } |
| protected String bytes2k(long v) { |
| return (v / 1024) + "k"; |
| } |
| |
| |
| |
| /** |
| * @return amount of used memory |
| */ |
| public long getUsed() { |
| return pool.getUsage().getUsed(); |
| } |
| |
| /** |
| * @return amount of committed memory |
| */ |
| public long getCommitted() { |
| return pool.getUsage().getCommitted(); |
| } |
| |
| private static MemoryPoolMXBean getMemoryPool(String name) { |
| List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans(); |
| for (MemoryPoolMXBean pool : pools) { |
| if (pool.getName().equals(name)) { |
| return pool; |
| } |
| } |
| return null; |
| } |
| |
| private static long detectPageSize() { |
| try { |
| Unsafe unsafe = Unsafe.getUnsafe(); |
| |
| int pageSize = unsafe.pageSize(); |
| System.out.println("Page size: " + pageSize); |
| return pageSize; |
| } catch (Exception e) { |
| throw new Fault("Cannot detect page size"); |
| } |
| } |
| |
| |
| long parseValue(String s) { |
| s = s.toLowerCase(); |
| int multiplier = 1; |
| switch (s.charAt(s.length() - 1)) { |
| case 'g': multiplier = 1024*1024*1024; break; |
| case 'm': multiplier = 1024*1024; break; |
| case 'k': multiplier = 1024; break; |
| } |
| if (multiplier == 1) { |
| return Long.parseLong(s); |
| } else { |
| return Long.parseLong(s.substring(0, s.length() - 1)) * multiplier; |
| } |
| } |
| |
| public static interface Foo { |
| } |
| |
| public static class FooBar implements Foo { |
| } |
| |
| class FooInvocationHandler implements InvocationHandler { |
| private final Foo foo; |
| |
| FooInvocationHandler(MetaspaceBaseGC.Foo foo) { |
| this.foo = foo; |
| } |
| |
| @Override |
| public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { |
| return method.invoke(foo, args); |
| } |
| } |
| |
| } |