1 /*
  2  * Copyright (c) 2020, 2024, 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 
 26 import org.openjdk.jmh.annotations.Benchmark;
 27 import org.openjdk.jmh.annotations.BenchmarkMode;
 28 import org.openjdk.jmh.annotations.Fork;
 29 import org.openjdk.jmh.annotations.Measurement;
 30 import org.openjdk.jmh.annotations.Mode;
 31 import org.openjdk.jmh.annotations.OutputTimeUnit;
 32 import org.openjdk.jmh.annotations.Setup;
 33 import org.openjdk.jmh.annotations.State;
 34 import org.openjdk.jmh.annotations.TearDown;
 35 import org.openjdk.jmh.annotations.Warmup;
 36 import jdk.internal.misc.Unsafe;
 37 
 38 import java.nio.ByteBuffer;
 39 import java.nio.ByteOrder;
 40 import java.nio.FloatBuffer;
 41 import java.util.concurrent.TimeUnit;
 42 
 43 import static java.lang.foreign.ValueLayout.JAVA_INT;
 44 
 45 @BenchmarkMode(Mode.AverageTime)
 46 @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
 47 @Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
 48 @State(org.openjdk.jmh.annotations.Scope.Thread)
 49 @OutputTimeUnit(TimeUnit.MILLISECONDS)
 50 @Fork(value = 3, jvmArgs = { "--add-opens=java.base/jdk.internal.misc=ALL-UNNAMED" })
 51 public class LoopOverPollutedBuffer {
 52 
 53     static final int ELEM_SIZE = 1_000_000;
 54     static final int CARRIER_SIZE = (int) JAVA_INT.byteSize();
 55     static final int ALLOC_SIZE = ELEM_SIZE * CARRIER_SIZE;
 56 
 57     static final Unsafe unsafe = Utils.unsafe;
 58 
 59     ByteBuffer dbb = ByteBuffer.allocateDirect(ALLOC_SIZE).order(ByteOrder.nativeOrder());
 60     byte[] arr = new byte[ALLOC_SIZE];
 61     @SuppressWarnings("initialization")
 62     ByteBuffer hbb = ByteBuffer.wrap(arr).order(ByteOrder.nativeOrder());
 63     FloatBuffer hfb = hbb.asFloatBuffer();
 64 
 65 
 66     @Setup
 67     public void setup() {
 68         for (int i = 0; i < ELEM_SIZE; i++) {
 69             dbb.putFloat(i * 4, i);
 70             hbb.putFloat(i * 4, i);
 71         }
 72         for (int i = 0; i < ELEM_SIZE; i++) {
 73             hfb.put(i, i);
 74         }
 75     }
 76 
 77     @TearDown
 78     public void tearDown() {
 79         unsafe.invokeCleaner(dbb);
 80         arr = null;
 81         hbb = null;
 82         hfb = null;
 83     }
 84 
 85     @Benchmark
 86     public int direct_byte_buffer_get_float() {
 87         int sum = 0;
 88         for (int k = 0; k < ELEM_SIZE; k++) {
 89             dbb.putFloat(k, (float)k + 1);
 90             float v = dbb.getFloat(k * 4);
 91             sum += (int)v;
 92         }
 93         return sum;
 94     }
 95 
 96     @Benchmark
 97     public int heap_byte_buffer_get_int() {
 98         int sum = 0;
 99         for (int k = 0; k < ELEM_SIZE; k++) {
100             hbb.putInt(k, k + 1);
101             int v = hbb.getInt(k * 4);
102             sum += v;
103         }
104         return sum;
105     }
106 
107     @Benchmark
108     public int unsafe_get_float() {
109         int sum = 0;
110         for (int k = 0; k < ALLOC_SIZE; k += 4) {
111             unsafe.putFloat(arr, k + Unsafe.ARRAY_BYTE_BASE_OFFSET, k + 1);
112             float v = unsafe.getFloat(arr, k + Unsafe.ARRAY_BYTE_BASE_OFFSET);
113             sum += (int)v;
114         }
115         return sum;
116     }
117 }