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. 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.jdk.incubator.foreign; 24 25 import jdk.incubator.foreign.MemoryLayout; 26 import org.openjdk.jmh.annotations.Benchmark; 27 import org.openjdk.jmh.annotations.BenchmarkMode; 28 import org.openjdk.jmh.annotations.CompilerControl; 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.Setup; 34 import org.openjdk.jmh.annotations.State; 35 import org.openjdk.jmh.annotations.TearDown; 36 import org.openjdk.jmh.annotations.Warmup; 37 import sun.misc.Unsafe; 38 39 import jdk.incubator.foreign.MemoryAddress; 40 import jdk.incubator.foreign.MemorySegment; 41 import java.lang.invoke.VarHandle; 42 import java.nio.ByteBuffer; 43 import java.nio.ByteOrder; 44 import java.util.concurrent.TimeUnit; 45 46 import static jdk.incubator.foreign.MemoryLayout.PathElement.sequenceElement; 47 import static jdk.incubator.foreign.MemoryLayouts.JAVA_INT; 48 49 @BenchmarkMode(Mode.AverageTime) 50 @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS) 51 @Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS) 52 @State(org.openjdk.jmh.annotations.Scope.Thread) 53 @OutputTimeUnit(TimeUnit.MILLISECONDS) 54 @Fork(3) 55 public class LoopOverConstant { 56 57 static final Unsafe unsafe = Utils.unsafe; 58 59 static final int ELEM_SIZE = 1_000_000; 60 static final int CARRIER_SIZE = (int)JAVA_INT.byteSize(); 61 static final int ALLOC_SIZE = ELEM_SIZE * CARRIER_SIZE; 62 63 static final long unsafe_addr = unsafe.allocateMemory(ALLOC_SIZE); 64 65 //setup unsafe address 66 67 static { 68 for (int i = 0; i < ELEM_SIZE; i++) { 69 unsafe.putInt(unsafe_addr + (i * CARRIER_SIZE) , i); 70 } 71 } 72 73 //setup native memory segment 74 75 static final MemoryAddress segment_addr = MemorySegment.allocateNative(ALLOC_SIZE).baseAddress(); 76 static final VarHandle VH_int = MemoryLayout.ofSequence(JAVA_INT).varHandle(int.class, sequenceElement()); 77 78 static { 79 for (int i = 0; i < ELEM_SIZE; i++) { VH_int.set(segment_addr, (long) i, i)80 VH_int.set(segment_addr, (long) i, i); 81 } 82 } 83 84 //setup direct buffer 85 86 static final ByteBuffer bb = ByteBuffer.allocateDirect(ALLOC_SIZE).order(ByteOrder.nativeOrder()); 87 88 static { 89 for (int i = 0; i < ELEM_SIZE; i++) { bb.putInt(i * CARRIER_SIZE , i)90 bb.putInt(i * CARRIER_SIZE , i); 91 } 92 } 93 94 @Benchmark 95 @OutputTimeUnit(TimeUnit.NANOSECONDS) unsafe_get()96 public int unsafe_get() { 97 return unsafe.getInt(unsafe_addr); 98 } 99 100 @Benchmark 101 @OutputTimeUnit(TimeUnit.NANOSECONDS) segment_get()102 public int segment_get() { 103 return (int)VH_int.get(segment_addr, 0L); 104 } 105 106 @Benchmark 107 @OutputTimeUnit(TimeUnit.NANOSECONDS) BB_get()108 public int BB_get() { 109 return bb.getInt(0); 110 } 111 112 @Benchmark unsafe_loop()113 public int unsafe_loop() { 114 int res = 0; 115 for (int i = 0; i < ELEM_SIZE; i ++) { 116 res += unsafe.getInt(unsafe_addr + (i * CARRIER_SIZE)); 117 } 118 return res; 119 } 120 121 @Benchmark segment_loop()122 public int segment_loop() { 123 int res = 0; 124 for (int i = 0; i < ELEM_SIZE; i++) { 125 res += (int) VH_int.get(segment_addr, (long)i); 126 } 127 return res; 128 } 129 130 @Benchmark BB_loop()131 public int BB_loop() { 132 int res = 0; 133 for (int i = 0; i < ELEM_SIZE; i++) { 134 res += bb.getInt(i * CARRIER_SIZE); 135 } 136 return res; 137 } 138 } 139