1 /*
2 * Copyright (c) 2021, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package org.openjdk.bench.java.lang.foreign;
24
25 import java.lang.foreign.MemorySegment;
26
27 import org.openjdk.jmh.annotations.Benchmark;
28 import org.openjdk.jmh.annotations.BenchmarkMode;
29 import org.openjdk.jmh.annotations.Fork;
30 import org.openjdk.jmh.annotations.Measurement;
31 import org.openjdk.jmh.annotations.Mode;
32 import org.openjdk.jmh.annotations.OutputTimeUnit;
33 import org.openjdk.jmh.annotations.Param;
34 import org.openjdk.jmh.annotations.Setup;
35 import org.openjdk.jmh.annotations.State;
36 import org.openjdk.jmh.annotations.TearDown;
37 import org.openjdk.jmh.annotations.Warmup;
38
39 import java.lang.foreign.Arena;
40 import java.util.ArrayList;
41 import java.util.List;
42 import java.util.concurrent.TimeUnit;
43
44 @BenchmarkMode(Mode.AverageTime)
45 @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
46 @Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
47 @State(org.openjdk.jmh.annotations.Scope.Thread)
48 @OutputTimeUnit(TimeUnit.MICROSECONDS)
49 @Fork(3)
50 public class MemorySessionClose {
51
52 static final int ALLOC_SIZE = 1024;
53
54 public enum StressMode {
55 NONE,
56 MEMORY,
57 THREADS
58 }
59
60 @Param({"NONE", "MEMORY", "THREADS"})
61 StressMode mode;
62
63 List<byte[]> arrays;
64 volatile boolean stop = false;
65 List<Thread> threads;
66
67 @Setup
68 public void setup() throws Throwable {
69 if (mode == StressMode.MEMORY) {
70 arrays = new ArrayList<>();
71 for (int i = 0; i < 100_000_000; i++) {
72 arrays.add(new byte[2]);
73 }
74 } else if (mode == StressMode.THREADS) {
75 threads = new ArrayList<>();
76 for (int i = 0 ; i < 4 ; i++) {
77 threads.add(new Thread(() -> {
78 while (true) {
79 if (stop) break;
80 // busy wait
81 }
82 }));
83 }
84 threads.forEach(Thread::start);
85 }
86
87 }
88
89 @TearDown
90 public void tearDown() throws Throwable {
91 arrays = null;
92 if (threads != null) {
93 stop = true;
94 threads.forEach(t -> {
95 try {
96 t.join();
97 } catch (InterruptedException ex) {
98 throw new IllegalStateException(ex);
99 }
100 });
101 }
102 }
103
104 @Benchmark
105 public MemorySegment confined_close() {
106 try (Arena arena = Arena.ofConfined()) {
107 return arena.allocate(ALLOC_SIZE, 4);
108 }
109 }
110
111 @Benchmark
112 public MemorySegment shared_close() {
113 try (Arena arena = Arena.ofShared()) {
114 return arena.allocate(ALLOC_SIZE, 4);
115 }
116 }
117
118 @Benchmark
119 public MemorySegment implicit_close() {
120 return Arena.ofAuto().allocate(ALLOC_SIZE, 4);
121 }
122
123 @Benchmark
124 public MemorySegment implicit_close_systemgc() {
125 if (gcCount++ == 0) System.gc(); // GC when we overflow
126 return Arena.ofAuto().allocate(ALLOC_SIZE, 4);
127 }
128
129 // keep
130 static byte gcCount = 0;
131 }