| /* |
| * Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| import java.util.*; |
| import java.nio.*; |
| import java.nio.charset.*; |
| import java.util.concurrent.*; |
| import java.util.regex.Pattern; |
| |
| /** |
| * Usage: java StringCodingBenchmark |
| * [-Diterations=N] [-Dsize=N] [-Dsubsize=N] [-Dmaxchar=N] |
| * [-Dfilter=REGEXP] [-DSecurityManager=true] |
| */ |
| public class StrCodingBenchmark { |
| abstract static class Job { |
| private final String name; |
| public Job(String name) { this.name = name; } |
| public String name() { return name; } |
| public abstract void work() throws Throwable; |
| } |
| |
| private static void collectAllGarbage() { |
| final java.util.concurrent.CountDownLatch drained |
| = new java.util.concurrent.CountDownLatch(1); |
| try { |
| System.gc(); // enqueue finalizable objects |
| new Object() { protected void finalize() { |
| drained.countDown(); }}; |
| System.gc(); // enqueue detector |
| drained.await(); // wait for finalizer queue to drain |
| System.gc(); // cleanup finalized objects |
| } catch (InterruptedException e) { throw new Error(e); } |
| } |
| |
| /** |
| * Runs each job for long enough that all the runtime compilers |
| * have had plenty of time to warm up, i.e. get around to |
| * compiling everything worth compiling. |
| * Returns array of average times per job per run. |
| */ |
| public static long[] time0(Job ... jobs) throws Throwable { |
| //final long warmupNanos = 10L * 1000L * 1000L * 1000L; |
| final long warmupNanos = 100L * 100L; |
| long[] nanoss = new long[jobs.length]; |
| for (int i = 0; i < jobs.length; i++) { |
| collectAllGarbage(); |
| long t0 = System.nanoTime(); |
| long t; |
| int j = 0; |
| do { jobs[i].work(); j++; } |
| while ((t = System.nanoTime() - t0) < warmupNanos); |
| nanoss[i] = t/j; |
| } |
| return nanoss; |
| } |
| |
| public static long[] time(Job ... jobs) throws Throwable { |
| |
| long[] warmup = time0(jobs); // Warm up run |
| long[] nanoss = time0(jobs); // Real timing run |
| long[] milliss = new long[jobs.length]; |
| double[] ratios = new double[jobs.length]; |
| |
| final String nameHeader = "Method"; |
| final String millisHeader = "Millis"; |
| final String ratioHeader = "Ratio"; |
| |
| int nameWidth = nameHeader.length(); |
| int millisWidth = millisHeader.length(); |
| int ratioWidth = ratioHeader.length(); |
| |
| for (int i = 0; i < jobs.length; i++) { |
| nameWidth = Math.max(nameWidth, jobs[i].name().length()); |
| |
| milliss[i] = nanoss[i]/(1000L * 1000L); |
| millisWidth = Math.max(millisWidth, |
| String.format("%d", milliss[i]).length()); |
| |
| ratios[i] = (double) nanoss[i] / (double) nanoss[0]; |
| ratioWidth = Math.max(ratioWidth, |
| String.format("%.3f", ratios[i]).length()); |
| } |
| String format = String.format("%%-%ds %%%dd %n", |
| nameWidth, millisWidth); |
| String headerFormat = String.format("%%-%ds %%%ds%n", |
| nameWidth, millisWidth); |
| System.out.printf(headerFormat, "Method", "Millis"); |
| |
| // Print out absolute and relative times, calibrated against first job |
| for (int i = 0; i < jobs.length; i++) |
| System.out.printf(format, jobs[i].name(), milliss[i], ratios[i]); |
| return milliss; |
| } |
| |
| public static Job[] filter(Pattern filter, Job[] jobs) { |
| if (filter == null) return jobs; |
| Job[] newJobs = new Job[jobs.length]; |
| int n = 0; |
| for (Job job : jobs) |
| if (filter.matcher(job.name()).find()) |
| newJobs[n++] = job; |
| // Arrays.copyOf not available in JDK 5 |
| Job[] ret = new Job[n]; |
| System.arraycopy(newJobs, 0, ret, 0, n); |
| return ret; |
| } |
| |
| static class PermissiveSecurityManger extends SecurityManager { |
| @Override public void checkPermission(java.security.Permission p) { |
| } |
| } |
| |
| public static void main(String[] args) throws Throwable { |
| final int itrs = Integer.getInteger("iterations", 100000); |
| final int size = Integer.getInteger("size", 2048); |
| final int subsize = Integer.getInteger("subsize", 128); |
| final int maxchar = Integer.getInteger("maxchar", 128); |
| final String regex = System.getProperty("filter"); |
| final Pattern filter = (regex == null) ? null : Pattern.compile(regex); |
| final boolean useSecurityManager = Boolean.getBoolean("SecurityManager"); |
| if (useSecurityManager) |
| System.setSecurityManager(new PermissiveSecurityManger()); |
| final Random rnd = new Random(); |
| |
| for (Charset charset: Charset.availableCharsets().values()) { |
| if (!("ISO-8859-1".equals(charset.name()) || |
| "US-ASCII".equals(charset.name()) || |
| charset.newDecoder() instanceof sun.nio.cs.SingleByte.Decoder)) |
| continue; |
| final String csn = charset.name(); |
| final Charset cs = charset; |
| final StringBuilder sb = new StringBuilder(); |
| { |
| final CharsetEncoder enc = cs.newEncoder(); |
| for (int i = 0; i < size; ) { |
| char c = (char) rnd.nextInt(maxchar); |
| if (enc.canEncode(c)) { |
| sb.append(c); |
| i++; |
| } |
| } |
| } |
| final String string = sb.toString(); |
| final byte[] bytes = string.getBytes(cs); |
| |
| System.out.printf("%n--------%s---------%n", csn); |
| for (int sz = 4; sz <= 2048; sz *= 2) { |
| System.out.printf(" [len=%d]%n", sz); |
| final byte[] bs = Arrays.copyOf(bytes, sz); |
| final String str = new String(bs, csn); |
| Job[] jobs = { |
| new Job("String decode: csn") { |
| public void work() throws Throwable { |
| for (int i = 0; i < itrs; i++) |
| new String(bs, csn); |
| }}, |
| |
| new Job("String decode: cs") { |
| public void work() throws Throwable { |
| for (int i = 0; i < itrs; i++) |
| new String(bs, cs); |
| }}, |
| |
| new Job("String encode: csn") { |
| public void work() throws Throwable { |
| for (int i = 0; i < itrs; i++) |
| str.getBytes(csn); |
| }}, |
| |
| new Job("String encode: cs") { |
| public void work() throws Throwable { |
| for (int i = 0; i < itrs; i++) |
| str.getBytes(cs); |
| }}, |
| }; |
| time(filter(filter, jobs)); |
| } |
| } |
| } |
| } |