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  */
  24 
  25 package org.openjdk.bench.jdk.incubator.foreign;
  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.State;
  34 import org.openjdk.jmh.annotations.Warmup;
  35 import sun.misc.Unsafe;
  36 
  37 import jdk.incubator.foreign.MemorySegment;
  38 import java.util.concurrent.TimeUnit;
  39 
  40 import static jdk.incubator.foreign.MemoryLayouts.JAVA_INT;
  41 
  42 @BenchmarkMode(Mode.AverageTime)
  43 @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
  44 @Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
  45 @State(org.openjdk.jmh.annotations.Scope.Thread)
  46 @OutputTimeUnit(TimeUnit.MILLISECONDS)
  47 @Fork(3)
  48 public class BulkOps {
  49 
  50     static final Unsafe unsafe = Utils.unsafe;
  51 
  52     static final int ELEM_SIZE = 1_000_000;
  53     static final int CARRIER_SIZE = (int)JAVA_INT.byteSize();
  54     static final int ALLOC_SIZE = ELEM_SIZE * CARRIER_SIZE;
  55 
  56     static final long unsafe_addr = unsafe.allocateMemory(ALLOC_SIZE);
  57     static final MemorySegment segment = MemorySegment.allocateNative(ALLOC_SIZE);
  58 
  59     static final int[] bytes = new int[ELEM_SIZE];
  60     static final MemorySegment bytesSegment = MemorySegment.ofArray(bytes);
  61     static final int UNSAFE_INT_OFFSET = unsafe.arrayBaseOffset(int[].class);
  62 
  63     static {
  64         for (int i = 0 ; i < bytes.length ; i++) {
  65             bytes[i] = i;
  66         }
  67     }
  68 
  69     @Benchmark
  70     @OutputTimeUnit(TimeUnit.NANOSECONDS)
  71     public void unsafe_fill() {
  72         unsafe.setMemory(unsafe_addr, ALLOC_SIZE, (byte)42);
  73     }
  74 
  75     @Benchmark
  76     @OutputTimeUnit(TimeUnit.NANOSECONDS)
  77     public void segment_fill() {
  78         segment.fill((byte)42);
  79     }
  80 
  81     @Benchmark
  82     @OutputTimeUnit(TimeUnit.NANOSECONDS)
  83     public void unsafe_copy() {
  84         unsafe.copyMemory(bytes, UNSAFE_INT_OFFSET, null, unsafe_addr, ALLOC_SIZE);
  85     }
  86 
  87     @Benchmark
  88     @OutputTimeUnit(TimeUnit.NANOSECONDS)
  89     public void segment_copy() {
  90         segment.copyFrom(bytesSegment);
  91     }
  92 }