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 jdk.incubator.foreign.ResourceScope;
 27 import org.openjdk.jmh.annotations.Benchmark;
 28 import org.openjdk.jmh.annotations.BenchmarkMode;
 29 import org.openjdk.jmh.annotations.CompilerControl;
 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 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(value = 3, jvmArgsAppend = { "--add-modules=jdk.incubator.foreign" })
 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 MemorySegment segment = MemorySegment.allocateNative(ALLOC_SIZE, ResourceScope.newImplicitScope());
 76     static final VarHandle VH_int = MemoryLayout.sequenceLayout(JAVA_INT).varHandle(int.class, sequenceElement());
 77 
 78     static {
 79         for (int i = 0; i < ELEM_SIZE; i++) {
 80             VH_int.set(segment, (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++) {
 90             bb.putInt(i * CARRIER_SIZE , i);
 91         }
 92     }
 93 
 94     @Benchmark
 95     @OutputTimeUnit(TimeUnit.NANOSECONDS)
 96     public int unsafe_get() {
 97         return unsafe.getInt(unsafe_addr);
 98     }
 99 
100     @Benchmark
101     @OutputTimeUnit(TimeUnit.NANOSECONDS)
102     public int segment_get() {
103         return (int)VH_int.get(segment, 0L);
104     }
105 
106     @Benchmark
107     @OutputTimeUnit(TimeUnit.NANOSECONDS)
108     public int BB_get() {
109         return bb.getInt(0);
110     }
111 
112     @Benchmark
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
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, (long)i);
126         }
127         return res;
128     }
129 
130     @Benchmark
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 }