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8283276: java/io/ObjectStreamClass/ObjectStreamClassCaching.java fails with various GCs

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Backport-of: d4a795d75aef8d787934f5c05e146c61138a408a
This commit is contained in:
Peter Levart 2022-08-04 16:53:57 +00:00
parent 43bb399375
commit 4b3dfe1d22
1 changed files with 87 additions and 29 deletions
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116
test/jdk/java/io/ObjectStreamClass/ObjectStreamClassCaching.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2021, 2022, 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
@ -30,29 +30,93 @@ import org.testng.annotations.Test;
import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertTrue;
/* @test
/*
* @test id=G1
* @requires vm.gc.G1
* @bug 8277072
* @library /test/lib/
* @summary ObjectStreamClass caches keep ClassLoaders alive
* @run testng/othervm -Xmx10m -XX:SoftRefLRUPolicyMSPerMB=1 ObjectStreamClassCaching
* @summary ObjectStreamClass caches keep ClassLoaders alive (G1 GC)
* @run testng/othervm -Xmx64m -XX:+UseG1GC ObjectStreamClassCaching
*/
/*
* @test id=Parallel
* @requires vm.gc.Parallel
* @bug 8277072
* @library /test/lib/
* @summary ObjectStreamClass caches keep ClassLoaders alive (Parallel GC)
* @run testng/othervm -Xmx64m -XX:+UseParallelGC ObjectStreamClassCaching
*/
/*
* @test id=Z
* @requires vm.gc.Z
* @bug 8277072
* @library /test/lib/
* @summary ObjectStreamClass caches keep ClassLoaders alive (Z GC)
* @run testng/othervm -Xmx64m -XX:+UseZGC ObjectStreamClassCaching
*/
/*
* @test id=Shenandoah
* @requires vm.gc.Shenandoah
* @bug 8277072
* @library /test/lib/
* @summary ObjectStreamClass caches keep ClassLoaders alive (Shenandoah GC)
* @run testng/othervm -Xmx64m -XX:+UseShenandoahGC ObjectStreamClassCaching
*/
/*
* @test id=Serial
* @requires vm.gc.Serial
* @bug 8277072
* @library /test/lib/
* @summary ObjectStreamClass caches keep ClassLoaders alive (Serial GC)
* @run testng/othervm -Xmx64m -XX:+UseSerialGC ObjectStreamClassCaching
*/
public class ObjectStreamClassCaching {
/**
* Test methods execute in same VM and are ordered by name.
* We test effectiveness 1st which is sensitive to previous allocations when ZGC is used.
*/
@Test
public void testCachingEffectiveness() throws Exception {
var ref = lookupObjectStreamClass(TestClass.class);
public void test1CacheEffectiveness() throws Exception {
var list = new ArrayList<>();
var ref1 = lookupObjectStreamClass(TestClass1.class);
var ref2 = newWeakRef();
boolean oome = false;
try {
while (!ref2.refersTo(null)) {
list.add(new byte[1024 * 1024 * 1]); // 1 MiB chunks
System.out.println("1MiB allocated...");
Thread.sleep(5L);
}
} catch (OutOfMemoryError e) {
// release
list = null;
oome = true;
}
assertFalse(oome, "WeakReference was not cleared although memory was pressed hard");
assertFalse(ref1.refersTo(null),
"Cache lost entry together with WeakReference being cleared although memory was not under pressure");
System.gc();
Thread.sleep(100L);
// to trigger any ReferenceQueue processing...
lookupObjectStreamClass(AnotherTestClass.class);
assertFalse(ref.refersTo(null),
"Cache lost entry although memory was not under pressure");
}
@Test
public void testCacheReleaseUnderMemoryPressure() throws Exception {
var ref = lookupObjectStreamClass(TestClass.class);
pressMemoryHard(ref);
public void test2CacheReleaseUnderMemoryPressure() throws Exception {
var list = new ArrayList<>();
var ref = lookupObjectStreamClass(TestClass2.class);
try {
while (!ref.refersTo(null)) {
list.add(new byte[1024 * 1024 * 4]); // 4 MiB chunks
System.out.println("4MiB allocated...");
}
} catch (OutOfMemoryError e) {
// release
list = null;
}
System.gc();
Thread.sleep(100L);
assertTrue(ref.refersTo(null),
@ -60,24 +124,18 @@ public class ObjectStreamClassCaching {
}
// separate method so that the looked-up ObjectStreamClass is not kept on stack
private static WeakReference<?> lookupObjectStreamClass(Class<?> cl) {
private static Reference<?> lookupObjectStreamClass(Class<?> cl) {
return new WeakReference<>(ObjectStreamClass.lookup(cl));
}
private static void pressMemoryHard(Reference<?> ref) {
try {
var list = new ArrayList<>();
while (!ref.refersTo(null)) {
list.add(new byte[1024 * 1024 * 64]); // 64 MiB chunks
}
} catch (OutOfMemoryError e) {
// release
}
// separate method so that the new Object() is not kept on stack
private static Reference<?> newWeakRef() {
return new WeakReference<>(new Object());
}
static class TestClass1 implements Serializable {
}
static class TestClass2 implements Serializable {
}
}
class TestClass implements Serializable {
}
class AnotherTestClass implements Serializable {
}