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8317124: use reproducible random in HotSpot tests

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Reviewed-by: lmesnik, epavlova
This commit is contained in:
Shiv Shah 2026-05-18 02:46:27 +00:00 committed by SendaoYan
parent 22b46872d0
commit 933a7765d9
15 changed files with 62 additions and 24 deletions
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4
test/hotspot/jtreg/compiler/c2/cmove/TestScalarConditionalMoveCmpObj.java
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2025, Rivos Inc. All rights reserved.
* Copyright (c) 2026, 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
@ -30,6 +31,7 @@ import jdk.test.lib.Utils;
/*
* @test
* @key randomness
* @summary Test conditional move + compare object.
* @library /test/lib /
* @run driver ${test.main.class}
@ -300,7 +302,7 @@ public class TestScalarConditionalMoveCmpObj {
for (int i = 0; i < a.length; i++) {
b[i] = a[i];
}
Random rand = new Random();
Random rand = Utils.getRandomInstance();
for (int i = 0; i < SIZE; i++) {
if (rand.nextInt(5) == 0) {
Object t = b[i];

5
test/hotspot/jtreg/compiler/c2/gvn/TestBoolNodeGVN.java
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2024 Red Hat and/or its affiliates. All rights reserved.
* Copyright (c) 2026, 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
@ -26,9 +27,11 @@ package compiler.c2.gvn;
import compiler.lib.ir_framework.*;
import java.util.Random;
import jdk.test.lib.Utils;
/**
* @test
* @key randomness
* @bug 8327381
* @summary Refactor boolean node tautology transformations
* @library /test/lib /
@ -139,7 +142,7 @@ public class TestBoolNodeGVN {
private static void testCorrectness() {
int[] values = {
-100, -42, -16, -8, -5, -1, 0, 1, 5, 8, 16, 42, 100,
new Random().nextInt(), Integer.MAX_VALUE, Integer.MIN_VALUE
Utils.getRandomInstance().nextInt(), Integer.MAX_VALUE, Integer.MIN_VALUE
};
for (int x : values) {

6
test/hotspot/jtreg/compiler/conversions/TestMoveConvI2LOrCastIIThruAddIs.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2020, 2026, 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
@ -25,10 +25,12 @@ package compiler.conversions;
import java.util.Objects;
import java.util.Random;
import jdk.test.lib.Utils;
import jdk.test.lib.Asserts;
/*
* @test
* @key randomness
* @bug 8254317 8256730
* @requires vm.compiler2.enabled
* @summary Exercises the optimization that moves integer-to-long conversions
@ -157,7 +159,7 @@ public class TestMoveConvI2LOrCastIIThruAddIs {
// We use a random number generator to avoid constant propagation in C2
// and produce a variable ("a" in the different tests) with a finite,
// small value range.
Random rnd = new Random();
Random rnd = Utils.getRandomInstance();
switch(args[0]) {
case "functional":
// Small, functional tests.

5
test/hotspot/jtreg/compiler/gallery/NormalMapping.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2025, 2026, 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
@ -33,6 +33,7 @@ import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;
import java.io.IOException;
import java.util.Random;
import jdk.test.lib.Utils;
import javax.swing.JPanel;
import java.awt.Font;
@ -78,7 +79,7 @@ import java.util.Arrays;
* - MyDrawingPanel: drawing all the parts to the screen.
*/
public class NormalMapping {
public static Random RANDOM = new Random();
public static Random RANDOM = Utils.getRandomInstance();
// Increasing this number will make the demo slower.
public static final int NUMBER_OF_LIGHTS = 5;

5
test/hotspot/jtreg/compiler/hotcode/StressHotCodeCollector.java
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@ -1,5 +1,6 @@
/*
* Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
* Copyright (c) 2026, 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
@ -24,6 +25,7 @@
/*
* @test
* @key randomness
* @library /test/lib /
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
@ -38,6 +40,7 @@ package compiler.hotcode;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Random;
import jdk.test.lib.Utils;
import jdk.test.lib.compiler.InMemoryJavaCompiler;
import jdk.test.whitebox.WhiteBox;
@ -89,7 +92,7 @@ public class StressHotCodeCollector {
generateCode();
long start = System.currentTimeMillis();
Random random = new Random();
Random random = Utils.getRandomInstance();
while (System.currentTimeMillis() - start < RUN_MILLIS) {
for (TestMethod m : methods) {

6
test/hotspot/jtreg/compiler/intrinsics/float16/Binary16ConversionNaN_2.java
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2025, 2026, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2025, Rivos Inc. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
@ -24,6 +24,7 @@
/*
* @test
* @key randomness
* @bug 8365206
* @summary Verify NaN sign and significand bits are preserved across conversions,
* float -> float16 -> float
@ -55,6 +56,7 @@ import compiler.whitebox.CompilerWhiteBoxTest;
import jdk.test.whitebox.WhiteBox;
import java.lang.reflect.Method;
import java.util.Random;
import jdk.test.lib.Utils;
public class Binary16ConversionNaN_2 {
@ -77,7 +79,7 @@ public class Binary16ConversionNaN_2 {
float[] nVal = new float[1024];
float[] nRes = new float[1024];
Random rand = new Random();
Random rand = Utils.getRandomInstance();
// A NaN has a nonzero significand
for (int i = 1; i <= 0x3ff; i++) {

13
test/hotspot/jtreg/compiler/loopopts/TestPartialPeelAtUnsignedTestsNegativeLimit.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2024, 2025, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2024, 2026, 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
@ -23,8 +23,10 @@
/*
* @test id=Xbatch
* @key randomness
* @bug 8332920
* @summary Tests partial peeling at unsigned tests with limit being negative in exit tests "i >u limit".
* @library /test/lib
* @run main/othervm/timeout=480 -Xbatch -XX:-TieredCompilation
* -XX:CompileOnly=*TestPartialPeel*::original*,*TestPartialPeel*::test*
* compiler.loopopts.TestPartialPeelAtUnsignedTestsNegativeLimit
@ -32,8 +34,10 @@
/*
* @test id=Xcomp-run-inline
* @key randomness
* @bug 8332920
* @summary Tests partial peeling at unsigned tests with limit being negative in exit tests "i >u limit".
* @library /test/lib
* @run main/othervm/timeout=480 -Xcomp -XX:-TieredCompilation
* -XX:CompileOnly=*TestPartialPeel*::original*,*TestPartialPeel*::run*,*TestPartialPeel*::test*
* -XX:CompileCommand=inline,*TestPartialPeelAtUnsignedTestsNegativeLimit::test*
@ -43,24 +47,29 @@
/*
* @test id=Xcomp-compile-test
* @key randomness
* @bug 8332920
* @summary Tests partial peeling at unsigned tests with limit being negative in exit tests "i >u limit".
* @library /test/lib
* @run main/othervm/timeout=480 -Xcomp -XX:-TieredCompilation -XX:CompileOnly=*TestPartialPeel*::original*,*TestPartialPeel*::test*
* compiler.loopopts.TestPartialPeelAtUnsignedTestsNegativeLimit
*/
/*
* @test id=vanilla
* @key randomness
* @bug 8332920
* @requires vm.flavor == "server" & (vm.opt.TieredStopAtLevel == null | vm.opt.TieredStopAtLevel == 4)
* @summary Tests partial peeling at unsigned tests with limit being negative in exit tests "i >u limit".
* Only run this test with C2 since it is time-consuming and only tests a C2 issue.
* @library /test/lib
* @run main/timeout=480 compiler.loopopts.TestPartialPeelAtUnsignedTestsNegativeLimit
*/
package compiler.loopopts;
import java.util.Random;
import jdk.test.lib.Utils;
import static java.lang.Integer.*;
@ -69,7 +78,7 @@ public class TestPartialPeelAtUnsignedTestsNegativeLimit {
static int iterations = 0;
static int iFld2;
static boolean flag;
final static Random RANDOM = new Random();
final static Random RANDOM = Utils.getRandomInstance();
public static void main(String[] args) {
compareUnsigned(3, 3); // Load Integer class for -Xcomp

7
test/hotspot/jtreg/compiler/loopopts/superword/TestLargeCompilation.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2024, 2026, 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
@ -25,8 +25,10 @@ package compiler.loopopts.superword;
/*
* @test
* @key randomness
* @bug 8327978
* @summary Test compile time for large compilation, where SuperWord takes especially much time.
* @library /test/lib
* @run main/othervm/timeout=30 -Xbatch
* -XX:CompileCommand=compileonly,compiler.loopopts.superword.TestLargeCompilation::test*
* -XX:+IgnoreUnrecognizedVMOptions -XX:LoopUnrollLimit=1000
@ -34,9 +36,10 @@ package compiler.loopopts.superword;
*/
import java.util.Random;
import jdk.test.lib.Utils;
public class TestLargeCompilation {
private static final Random random = new Random();
private static final Random random = Utils.getRandomInstance();
static final int RANGE_CON = 1024 * 8;
static int init = 593436;

3
test/hotspot/jtreg/compiler/vectorapi/TestVectorMaskTrueCount.java
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2023, Arm Limited. All rights reserved.
* Copyright (c) 2026, 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
@ -46,7 +47,7 @@ public class TestVectorMaskTrueCount {
private static final VectorSpecies<Double> SPECIES_D = DoubleVector.SPECIES_128;
private static final VectorSpecies<Integer> SPECIES_I = IntVector.SPECIES_128;
private static final int LENGTH = 1024;
private static final Random RD = new Random();
private static final Random RD = Utils.getRandomInstance();
private static boolean[] ba;
private static boolean[] bb;

5
test/hotspot/jtreg/compiler/vectorization/TestRoundVectorDoubleRandom.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2024, 2026, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2024, Rivos Inc. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
@ -37,6 +37,7 @@
package compiler.vectorization;
import java.util.Random;
import jdk.test.lib.Utils;
import static compiler.lib.golden.GoldenRound.golden_round;
import compiler.lib.ir_framework.IR;
import compiler.lib.ir_framework.IRNode;
@ -47,7 +48,7 @@ import compiler.lib.ir_framework.TestFramework;
import compiler.lib.ir_framework.Warmup;
public class TestRoundVectorDoubleRandom {
private static final Random rand = new Random();
private static final Random rand = Utils.getRandomInstance();
private static final int ITERS = 11000;
private static final int ARRLEN = rand.nextInt(4096-997) + 997;

6
test/hotspot/jtreg/compiler/vectorization/TestRoundVectorFloatAll.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2024, 2026, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2024, Rivos Inc. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
@ -24,6 +24,7 @@
/**
* @test
* @key randomness
* @bug 8321010
* @summary Test vector intrinsic for Math.round(float) in full 32 bits range
*
@ -37,10 +38,11 @@
package compiler.vectorization;
import java.util.Random;
import jdk.test.lib.Utils;
import static compiler.lib.golden.GoldenRound.golden_round;
public class TestRoundVectorFloatAll {
private static final Random rand = new Random();
private static final Random rand = Utils.getRandomInstance();
private static final int ITERS = 11000;
private static final int ARRLEN = rand.nextInt(4096-997) + 997;

5
test/hotspot/jtreg/compiler/vectorization/TestRoundVectorFloatRandom.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2024, 2026, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2024, Rivos Inc. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
@ -37,6 +37,7 @@
package compiler.vectorization;
import java.util.Random;
import jdk.test.lib.Utils;
import static compiler.lib.golden.GoldenRound.golden_round;
import compiler.lib.ir_framework.IR;
import compiler.lib.ir_framework.IRNode;
@ -47,7 +48,7 @@ import compiler.lib.ir_framework.TestFramework;
import compiler.lib.ir_framework.Warmup;
public class TestRoundVectorFloatRandom {
private static final Random rand = new Random();
private static final Random rand = Utils.getRandomInstance();
private static final int ITERS = 11000;
private static final int ARRLEN = rand.nextInt(4096-997) + 997;

5
test/hotspot/jtreg/runtime/Metaspace/elastic/AllocationProfile.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2020, 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2020, 2026, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2020 SAP SE. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
@ -24,6 +24,7 @@
*/
import java.util.*;
import jdk.test.lib.Utils;
public class AllocationProfile {
@ -47,7 +48,7 @@ public class AllocationProfile {
* Returns random allocation size measured in words
*/
public long randomAllocationSize() {
Random r = new Random();
Random r = Utils.getRandomInstance();
return r.nextInt((int)(maximumSingleAllocationSize - minimumSingleAllocationSize + 1)) + minimumSingleAllocationSize;
}

2
test/hotspot/jtreg/runtime/Metaspace/elastic/TestMetaspaceAllocation.java
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@ -26,6 +26,7 @@
/*
* @test id=debug
* @bug 8251158
* @key randomness
* @library /test/lib
* @modules java.base/jdk.internal.misc java.management
* @build jdk.test.whitebox.WhiteBox
@ -37,6 +38,7 @@
/*
* @test id=ndebug
* @bug 8251158
* @key randomness
* @library /test/lib
* @modules java.base/jdk.internal.misc java.management
* @build jdk.test.whitebox.WhiteBox

9
test/hotspot/jtreg/runtime/NMT/NMTInitializationTest.java
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@ -1,6 +1,6 @@
/*
* Copyright (c) 2021 SAP SE. All rights reserved.
* Copyright (c) 2021, 2023, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2021, 2026, 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
@ -45,6 +45,7 @@
/**
* @test id=normal-off
* @bug 8256844
* @key randomness
* @library /test/lib
* @modules java.base/jdk.internal.misc
* java.management
@ -54,6 +55,7 @@
/**
* @test id=normal-detail
* @bug 8256844
* @key randomness
* @library /test/lib
* @modules java.base/jdk.internal.misc
* java.management
@ -63,6 +65,7 @@
/**
* @test id=default_long-off
* @bug 8256844
* @key randomness
* @library /test/lib
* @modules java.base/jdk.internal.misc
* java.management
@ -72,6 +75,7 @@
/**
* @test id=default_long-detail
* @bug 8256844
* @key randomness
* @library /test/lib
* @modules java.base/jdk.internal.misc
* java.management
@ -87,6 +91,7 @@ import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Random;
import jdk.test.lib.Utils;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
@ -95,7 +100,7 @@ public class NMTInitializationTest {
final static boolean debug = true;
static String randomString() {
Random r = new Random();
Random r = Utils.getRandomInstance();
int len = r.nextInt(100) + 100;
StringBuilder bld = new StringBuilder();
for (int i = 0; i < len; i ++) {