8242312: use reproducible random in hotspot gc tests

Reviewed-by: mdoerr
Backport-of: 5efa545

test/hotspot/jtreg/gc/TestSoftReferencesBehaviorOnOOME.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2020, 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
@@ -25,7 +25,7 @@
 
 /**
  * @test TestSoftReferencesBehaviorOnOOME
- * @key gc
+ * @key gc randomness
  * @summary Tests that all SoftReferences has been cleared at time of OOM.
  * @requires vm.gc != "Z"
  * @library /test/lib

test/hotspot/jtreg/gc/epsilon/TestByteArrays.java

@@ -25,9 +25,10 @@
 
 /**
  * @test TestByteArrays
- * @key gc
+ * @key gc randomness
  * @requires vm.gc.Epsilon & !vm.graal.enabled
  * @summary Epsilon is able to allocate arrays, and does not corrupt their state
+ * @library /test/lib
  *
  * @run main/othervm -XX:+UseTLAB -Xmx256m
  *                   -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
@@ -69,16 +70,15 @@
  */
 
 import java.util.Random;
+import jdk.test.lib.Utils;
 
 public class TestByteArrays {
-
-  static long SEED = Long.getLong("seed", System.nanoTime());
   static int COUNT = Integer.getInteger("count", 500); // ~100 MB allocation
 
   static byte[][] arr;
 
   public static void main(String[] args) throws Exception {
-    Random r = new Random(SEED);
+    Random r = Utils.getRandomInstance();
 
     arr = new byte[COUNT * 100][];
     for (int c = 0; c < COUNT; c++) {
@@ -88,7 +88,7 @@ public static void main(String[] args) throws Exception {
       }
     }
 
-    r = new Random(SEED);
+    r = new Random(Utils.SEED);
     for (int c = 0; c < COUNT; c++) {
       byte[] b = arr[c];
       if (b.length != (c * 100)) {

test/hotspot/jtreg/gc/epsilon/TestElasticTLAB.java

@@ -25,9 +25,10 @@
 
 /**
  * @test TestElasticTLAB
- * @key gc
+ * @key gc randomness
  * @requires vm.gc.Epsilon & !vm.graal.enabled
  * @summary Epsilon is able to work with/without elastic TLABs
+ * @library /test/lib
  *
  * @run main/othervm -Xmx256m
  *                   -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
@@ -56,16 +57,16 @@
  */
 
 import java.util.Random;
+import jdk.test.lib.Utils;
 
 public class TestElasticTLAB {
 
-  static long SEED = Long.getLong("seed", System.nanoTime());
   static int COUNT = Integer.getInteger("count", 500); // ~100 MB allocation
 
   static byte[][] arr;
 
   public static void main(String[] args) throws Exception {
-    Random r = new Random(SEED);
+    Random r = Utils.getRandomInstance();
 
     arr = new byte[COUNT * 100][];
     for (int c = 0; c < COUNT; c++) {
@@ -75,7 +76,7 @@ public static void main(String[] args) throws Exception {
       }
     }
 
-    r = new Random(SEED);
+    r = new Random(Utils.SEED);
     for (int c = 0; c < COUNT; c++) {
       byte[] b = arr[c];
       if (b.length != (c * 100)) {

test/hotspot/jtreg/gc/epsilon/TestElasticTLABDecay.java

@@ -25,9 +25,10 @@
 
 /**
  * @test TestElasticTLABDecay
- * @key gc
+ * @key gc randomness
  * @requires vm.gc.Epsilon & !vm.graal.enabled
  * @summary Epsilon is able to work with/without elastic TLABs
+ * @library /test/lib
  *
  * @run main/othervm -Xmx256m
  *                   -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
@@ -46,16 +47,15 @@
  */
 
 import java.util.Random;
+import jdk.test.lib.Utils;
 
 public class TestElasticTLABDecay {
-
-  static long SEED = Long.getLong("seed", System.nanoTime());
   static int COUNT = Integer.getInteger("count", 500); // ~100 MB allocation
 
   static byte[][] arr;
 
   public static void main(String[] args) throws Exception {
-    Random r = new Random(SEED);
+    Random r = Utils.getRandomInstance();
 
     arr = new byte[COUNT * 100][];
     for (int c = 0; c < COUNT; c++) {
@@ -66,7 +66,7 @@ public static void main(String[] args) throws Exception {
       Thread.sleep(5);
     }
 
-    r = new Random(SEED);
+    r = new Random(Utils.SEED);
     for (int c = 0; c < COUNT; c++) {
       byte[] b = arr[c];
       if (b.length != (c * 100)) {

test/hotspot/jtreg/gc/epsilon/TestObjects.java

@@ -25,9 +25,10 @@
 
 /**
  * @test TestObjects
- * @key gc
+ * @key gc randomness
  * @requires vm.gc.Epsilon & !vm.graal.enabled
  * @summary Epsilon is able to allocate objects, and does not corrupt their state
+ * @library /test/lib
  *
  * @run main/othervm -XX:+UseTLAB -Xmx256m
  *                   -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
@@ -69,23 +70,22 @@
  */
 
 import java.util.Random;
+import jdk.test.lib.Utils;
 
 public class TestObjects {
-
-  static long SEED = Long.getLong("seed", System.nanoTime());
   static int COUNT = Integer.getInteger("count", 1_000_000); // ~24 MB allocation
 
   static MyObject[] arr;
 
   public static void main(String[] args) throws Exception {
-    Random r = new Random(SEED);
+    Random r = Utils.getRandomInstance();
 
     arr = new MyObject[COUNT];
     for (int c = 0; c < COUNT; c++) {
       arr[c] = new MyObject(r.nextInt());
     }
 
-    r = new Random(SEED);
+    r = new Random(Utils.SEED);
     for (int c = 0; c < COUNT; c++) {
       int expected = r.nextInt();
       int actual = arr[c].id();

test/hotspot/jtreg/gc/epsilon/TestRefArrays.java

@@ -25,7 +25,7 @@
 
 /**
  * @test TestRefArrays
- * @key gc
+ * @key gc randomness
  * @requires vm.gc.Epsilon & !vm.graal.enabled
  * @summary Epsilon is able to allocate arrays, and does not corrupt their state
  * @library /test/lib
@@ -70,16 +70,15 @@
  */
 
 import java.util.Random;
+import jdk.test.lib.Utils;
 
 public class TestRefArrays {
-
-  static long SEED = Long.getLong("seed", System.nanoTime());
   static int COUNT = Integer.getInteger("count", 200); // ~100 MB allocation
 
   static MyObject[][] arr;
 
   public static void main(String[] args) throws Exception {
-    Random r = new Random(SEED);
+    Random r = Utils.getRandomInstance();
 
     arr = new MyObject[COUNT * 100][];
     for (int c = 0; c < COUNT; c++) {
@@ -89,7 +88,7 @@ public static void main(String[] args) throws Exception {
       }
     }
 
-    r = new Random(SEED);
+    r = new Random(Utils.SEED);
     for (int c = 0; c < COUNT; c++) {
       MyObject[] b = arr[c];
       if (b.length != (c * 100)) {

test/hotspot/jtreg/gc/g1/TestEagerReclaimHumongousRegionsClearMarkBits.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2020, 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
@@ -28,7 +28,7 @@
  * @bug 8051973
  * @summary Test to make sure that eager reclaim of humongous objects correctly clears
  * mark bitmaps at reclaim.
- * @key gc
+ * @key gc randomness
  * @requires vm.gc.G1
  * @library /test/lib
  * @modules java.base/jdk.internal.misc
@@ -42,6 +42,7 @@
 
 import jdk.test.lib.process.OutputAnalyzer;
 import jdk.test.lib.process.ProcessTools;
+import jdk.test.lib.Utils;
 
 // An object that has a few references to other instances to slow down marking.
 class ObjectWithSomeRefs {
@@ -75,7 +76,7 @@ public static void main(String[] args) {
              longList.add(new ObjectWithSomeRefs());
         }
 
-        Random rnd = new Random();
+        Random rnd = Utils.getRandomInstance();
         for (int i = 0; i < longList.size(); i++) {
              int len = longList.size();
              longList.get(i).other1 = longList.get(rnd.nextInt(len));

test/hotspot/jtreg/gc/g1/TestShrinkAuxiliaryData.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2020, 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
@@ -25,6 +25,7 @@
 
 import jdk.test.lib.Asserts;
 import jdk.test.lib.Platform;
+import jdk.test.lib.Utils;
 import jdk.test.lib.process.ProcessTools;
 import jdk.test.lib.process.OutputAnalyzer;
 import jdk.test.lib.Utils;
@@ -40,10 +41,12 @@
 import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.Random;
 import jdk.internal.misc.Unsafe; // for ADDRESS_SIZE
 import sun.hotspot.WhiteBox;
 
 public class TestShrinkAuxiliaryData {
+    private static final Random RNG = Utils.getRandomInstance();
 
     private static final int REGION_SIZE = 1024 * 1024;
 
@@ -215,7 +218,7 @@ public void addRef(GarbageObject g) {
 
             public void mutate() {
                 if (!payload.isEmpty() && payload.get(0).length > 0) {
-                    payload.get(0)[0] = (byte) (Math.random() * Byte.MAX_VALUE);
+                    payload.get(0)[0] = (byte) (RNG.nextDouble() * Byte.MAX_VALUE);
                 }
             }
         }
@@ -296,12 +299,12 @@ private void link() {
                 for (int i = 0; i < NUM_LINKS; i++) {
                     int regionToLink;
                     do {
-                        regionToLink = (int) (Math.random() * REGIONS_TO_ALLOCATE);
+                        regionToLink = (int) (RNG.nextDouble() * REGIONS_TO_ALLOCATE);
                     } while (regionToLink == regionNumber);
 
                     // get random garbage object from random region
                     garbage.get(ig).addRef(garbage.get(regionToLink
-                            * NUM_OBJECTS_PER_REGION + (int) (Math.random()
+                            * NUM_OBJECTS_PER_REGION + (int) (RNG.nextDouble()
                             * NUM_OBJECTS_PER_REGION)));
                 }
             }

test/hotspot/jtreg/gc/g1/TestShrinkAuxiliaryData00.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2020, 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
@@ -25,6 +25,7 @@
 
 /**
  * @test TestShrinkAuxiliaryData00
+ * @key randomness
  * @bug 8038423 8061715
  * @summary Checks that decommitment occurs for JVM with different
  * G1ConcRSLogCacheSize and ObjectAlignmentInBytes options values

test/hotspot/jtreg/gc/g1/TestShrinkAuxiliaryData05.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2020, 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
@@ -25,6 +25,7 @@
 
 /**
  * @test TestShrinkAuxiliaryData05
+ * @key randomness
  * @bug 8038423 8061715 8078405
  * @summary Checks that decommitment occurs for JVM with different
  * G1ConcRSLogCacheSize and ObjectAlignmentInBytes options values

test/hotspot/jtreg/gc/g1/TestShrinkAuxiliaryData10.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2020, 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
@@ -25,6 +25,7 @@
 
 /**
  * @test TestShrinkAuxiliaryData10
+ * @key randomness
  * @bug 8038423 8061715 8078405
  * @summary Checks that decommitment occurs for JVM with different
  * G1ConcRSLogCacheSize and ObjectAlignmentInBytes options values

test/hotspot/jtreg/gc/g1/TestShrinkAuxiliaryData15.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2020, 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
@@ -26,6 +26,7 @@
 /**
  * @test TestShrinkAuxiliaryData15
  * @bug 8038423 8061715 8078405
+ * @key randomness
  * @summary Checks that decommitment occurs for JVM with different
  * G1ConcRSLogCacheSize and ObjectAlignmentInBytes options values
  * @requires vm.gc.G1

test/hotspot/jtreg/gc/g1/TestShrinkAuxiliaryData20.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2020, 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
@@ -25,6 +25,7 @@
 
 /**
  * @test TestShrinkAuxiliaryData20
+ * @key randomness
  * @bug 8038423 8061715 8078405
  * @summary Checks that decommitment occurs for JVM with different
  * G1ConcRSLogCacheSize and ObjectAlignmentInBytes options values

test/hotspot/jtreg/gc/g1/TestShrinkAuxiliaryData25.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2020, 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
@@ -25,6 +25,7 @@
 
 /**
  * @test TestShrinkAuxiliaryData25
+ * @key randomness
  * @bug 8038423 8061715 8078405
  * @summary Checks that decommitment occurs for JVM with different
  * G1ConcRSLogCacheSize and ObjectAlignmentInBytes options values