1 /* 2 * Copyright Amazon.com Inc. 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 package org.openjdk.bench.java.util.zip; 25 26 import org.openjdk.jmh.annotations.Benchmark; 27 import org.openjdk.jmh.annotations.BenchmarkMode; 28 import org.openjdk.jmh.annotations.Mode; 29 import org.openjdk.jmh.annotations.OutputTimeUnit; 30 import org.openjdk.jmh.annotations.Level; 31 import org.openjdk.jmh.annotations.Param; 32 import org.openjdk.jmh.annotations.Scope; 33 import org.openjdk.jmh.annotations.Setup; 34 import org.openjdk.jmh.annotations.State; 35 36 import java.io.ByteArrayInputStream; 37 import java.io.File; 38 import java.io.FileInputStream; 39 import java.io.FileOutputStream; 40 import java.io.IOException; 41 import java.util.Random; 42 import java.util.concurrent.TimeUnit; 43 import java.util.zip.Inflater; 44 import java.util.zip.InflaterOutputStream; 45 import java.util.zip.DeflaterOutputStream; 46 47 /** 48 * Test the average execution time of "InflaterOutputStream.write()" depending 49 * on the size of the internal "InflaterOutputStream" byte buffer and the size 50 * of the compressed data input buffer passed to "write()". 51 * 52 * The size of the compressed data input buffer is controlled by the "size" 53 * parameter which runs from "512" to "65536". 54 * 55 * The size of the internal byte buffer is a multiple of "size" controlled by 56 * the "scale" paramter which runs from "1" to "8". 57 * 58 * For peak perfomance the internal buffer should be big enough to hold all 59 * the data decompressed from the input buffer. This of course depends on 60 * the compression rate of the input data. E.g. if the compression rate of 61 * the compressed input data is 4 (i.e. the original input data was compressed 62 * to 1/4 of its original size) the internal buffer should be four times bigger 63 * than the size of the compressed data buffer passed to "write()" because in 64 * that case one single call to the native zlib "inflate()" method is sufficent 65 * to decompress all data and store it in the output buffer from where it can 66 * be written to the output stream with one single call to the output streams 67 * "write()" method. 68 */ 69 @BenchmarkMode(Mode.AverageTime) 70 @OutputTimeUnit(TimeUnit.MILLISECONDS) 71 @State(Scope.Thread) 72 public class Streams { 73 74 private FileInputStream in; 75 private FileOutputStream out; 76 @Param({"512", "1024", "2048", "4096", "8192", "16384", "32768", "65536"}) 77 private int size; 78 @Param({"1", "2", "4", "8"}) 79 private int scale; 80 private byte[] buf; 81 82 private static byte[] data = new byte[1024 * 1024]; 83 84 @Setup(Level.Trial) beforeRun()85 public void beforeRun() throws IOException { 86 // The reason for this whole dance is to programmatically create a one 87 // megabyte file which can be compressed by factor ~6. This will give 88 // us good results for the various scale factors (i.e. the relation 89 // between the deflated input buffer and the inflated output buffer). 90 // We achieve the desired compression factor by creating a 64 byte 91 // array of random data and than fill the final 1mb file with random 92 // 8-byte substrings of these 64 random bytes. This vaguely mimics 93 // a language with 8 character words over a set of 64 different characters. 94 final int characters = 64; 95 final int wordLength = 8; 96 buf = new byte[characters]; 97 Random r = new Random(123456789); 98 r.nextBytes(buf); 99 for (int i = 0; i < data.length / wordLength; i++) { 100 System.arraycopy(buf, r.nextInt(characters - wordLength), data, i * wordLength, wordLength); 101 } 102 ByteArrayInputStream bais = new ByteArrayInputStream(data); 103 104 File deflated = File.createTempFile("inflaterOutputStreamWrite", ".deflated"); 105 deflated.deleteOnExit(); 106 FileOutputStream fout = new FileOutputStream(deflated); 107 DeflaterOutputStream defout = new DeflaterOutputStream(fout); 108 bais.transferTo(defout); 109 // We need to close the DeflaterOutputStream in order to flush all the 110 // compressed data in the Deflater and the underlying FileOutputStream. 111 defout.close(); 112 in = new FileInputStream(deflated); 113 File inflated = File.createTempFile("inflaterOutputStreamWrite", ".inflated"); 114 inflated.deleteOnExit(); 115 out = new FileOutputStream(inflated); 116 } 117 118 @Setup(Level.Iteration) beforeIteration()119 public void beforeIteration() throws IOException { 120 in.getChannel().position(0); 121 out.getChannel().position(0); 122 buf = new byte[size]; 123 } 124 125 @Benchmark inflaterOutputStreamWrite()126 public void inflaterOutputStreamWrite() throws IOException { 127 in.getChannel().position(0); 128 out.getChannel().position(0); 129 InflaterOutputStream inflate = new InflaterOutputStream(out, new Inflater(), scale * size); 130 int len; 131 // buf.length == size 132 while ((len = in.read(buf)) != -1) { 133 inflate.write(buf, 0, len); 134 } 135 inflate.finish(); 136 } 137 } 138