1 /*
  2  * Copyright (c) 2020, 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.  Oracle designates this
  8  * particular file as subject to the "Classpath" exception as provided
  9  * by Oracle in the LICENSE file that accompanied this code.
 10  *
 11  * This code is distributed in the hope that it will be useful, but WITHOUT
 12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 14  * version 2 for more details (a copy is included in the LICENSE file that
 15  * accompanied this code).
 16  *
 17  * You should have received a copy of the GNU General Public License version
 18  * 2 along with this work; if not, write to the Free Software Foundation,
 19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 20  *
 21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 22  * or visit www.oracle.com if you need additional information or have any
 23  * questions.
 24  */
 25 package org.openjdk.bench.jdk.incubator.foreign;
 26 
 27 
 28 import org.openjdk.jmh.annotations.Benchmark;
 29 import org.openjdk.jmh.annotations.BenchmarkMode;
 30 import org.openjdk.jmh.annotations.Fork;
 31 import org.openjdk.jmh.annotations.Measurement;
 32 import org.openjdk.jmh.annotations.Mode;
 33 import org.openjdk.jmh.annotations.OutputTimeUnit;
 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 import sun.misc.Unsafe;
 39 
 40 import java.nio.ByteBuffer;
 41 import java.nio.ByteOrder;
 42 import java.nio.FloatBuffer;
 43 import java.util.concurrent.TimeUnit;
 44 
 45 import static jdk.incubator.foreign.ValueLayout.JAVA_INT;
 46 
 47 @BenchmarkMode(Mode.AverageTime)
 48 @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
 49 @Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
 50 @State(org.openjdk.jmh.annotations.Scope.Thread)
 51 @OutputTimeUnit(TimeUnit.MILLISECONDS)
 52 @Fork(value = 3, jvmArgsAppend = { "--add-modules=jdk.incubator.foreign" })
 53 public class LoopOverPollutedBuffer {
 54 
 55     static final int ELEM_SIZE = 1_000_000;
 56     static final int CARRIER_SIZE = (int) JAVA_INT.byteSize();
 57     static final int ALLOC_SIZE = ELEM_SIZE * CARRIER_SIZE;
 58 
 59     static final Unsafe unsafe = Utils.unsafe;
 60 
 61     ByteBuffer dbb = ByteBuffer.allocateDirect(ALLOC_SIZE).order(ByteOrder.nativeOrder());
 62     byte[] arr = new byte[ALLOC_SIZE];
 63     ByteBuffer hbb = ByteBuffer.wrap(arr).order(ByteOrder.nativeOrder());
 64     FloatBuffer hfb = hbb.asFloatBuffer();
 65 
 66 
 67     @Setup
 68     public void setup() {
 69         for (int i = 0; i < ELEM_SIZE; i++) {
 70             dbb.putFloat(i * 4, i);
 71             hbb.putFloat(i * 4, i);
 72         }
 73         for (int i = 0; i < ELEM_SIZE; i++) {
 74             hfb.put(i, i);
 75         }
 76     }
 77 
 78     @TearDown
 79     public void tearDown() {
 80         unsafe.invokeCleaner(dbb);
 81         arr = null;
 82         hbb = null;
 83         hfb = null;
 84     }
 85 
 86     @Benchmark
 87     public int direct_byte_buffer_get_float() {
 88         int sum = 0;
 89         for (int k = 0; k < ELEM_SIZE; k++) {
 90             dbb.putFloat(k, (float)k + 1);
 91             float v = dbb.getFloat(k * 4);
 92             sum += (int)v;
 93         }
 94         return sum;
 95     }
 96 
 97     @Benchmark
 98     public int heap_byte_buffer_get_int() {
 99         int sum = 0;
100         for (int k = 0; k < ELEM_SIZE; k++) {
101             hbb.putInt(k, k + 1);
102             int v = hbb.getInt(k * 4);
103             sum += v;
104         }
105         return sum;
106     }
107 
108     @Benchmark
109     public int unsafe_get_float() {
110         int sum = 0;
111         for (int k = 0; k < ALLOC_SIZE; k += 4) {
112             unsafe.putFloat(arr, k + Unsafe.ARRAY_BYTE_BASE_OFFSET, k + 1);
113             float v = unsafe.getFloat(arr, k + Unsafe.ARRAY_BYTE_BASE_OFFSET);
114             sum += (int)v;
115         }
116         return sum;
117     }
118 }