| /* |
| * Copyright (c) 2007, 2016, 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. |
| */ |
| |
| /* |
| * This is not a regression test, but a micro-benchmark. |
| * To exercise swap, run with filter=LITTLE_ENDIAN on sparc, |
| * filter=BIG_ENDIAN on x86. |
| * |
| * I have run this as follows: |
| * |
| * for f in -client -server; do mergeBench dolphin . jr -dsa -da $f SwapMicroBenchmark.java filter=LITTLE_ENDIAN; done |
| * |
| * @author Martin Buchholz |
| */ |
| |
| import java.util.*; |
| import java.nio.*; |
| import java.util.regex.Pattern; |
| |
| public class SwapMicroBenchmark { |
| 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. |
| */ |
| private static long[] time0(Job ... jobs) throws Throwable { |
| final long warmupNanos = 10L * 1000L * 1000L * 1000L; |
| 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; |
| } |
| |
| private static void 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 %%%d.3f%%n", |
| nameWidth, millisWidth, ratioWidth); |
| String headerFormat = String.format("%%-%ds %%%ds %%%ds%%n", |
| nameWidth, millisWidth, ratioWidth); |
| System.out.printf(headerFormat, "Method", "Millis", "Ratio"); |
| |
| // 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]); |
| } |
| |
| private static String keywordValue(String[] args, String keyword) { |
| for (String arg : args) |
| if (arg.startsWith(keyword)) |
| return arg.substring(keyword.length() + 1); |
| return null; |
| } |
| |
| private static int intArg(String[] args, String keyword, int defaultValue) { |
| String val = keywordValue(args, keyword); |
| return val == null ? defaultValue : Integer.parseInt(val); |
| } |
| |
| private static Pattern patternArg(String[] args, String keyword) { |
| String val = keywordValue(args, keyword); |
| return val == null ? null : Pattern.compile(val); |
| } |
| |
| private 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; |
| } |
| |
| private static void deoptimize(int sum) { |
| if (sum == 42) |
| System.out.println("the answer"); |
| } |
| |
| /** |
| * Usage: [iterations=N] [size=N] [filter=REGEXP] |
| */ |
| public static void main(String[] args) throws Throwable { |
| final int iterations = intArg(args, "iterations", 10000); |
| final int size = intArg(args, "size", 1024); |
| final Pattern filter = patternArg(args, "filter"); |
| |
| final Random rnd = new Random(); |
| |
| final ByteBuffer b = ByteBuffer.allocateDirect(8*size); |
| for (int i = 0; i < b.limit(); i++) |
| b.put(i, (byte) rnd.nextInt()); |
| |
| Job[] jobs = { |
| new Job("swap char BIG_ENDIAN") { |
| public void work() throws Throwable { |
| b.order(ByteOrder.BIG_ENDIAN); |
| CharBuffer x = b.asCharBuffer(); |
| for (int i = 0; i < iterations; i++) { |
| int sum = 0; |
| for (int j = 0, end = x.limit(); j < end; j++) |
| sum += x.get(j); |
| deoptimize(sum);}}}, |
| new Job("swap char LITTLE_ENDIAN") { |
| public void work() throws Throwable { |
| b.order(ByteOrder.LITTLE_ENDIAN); |
| CharBuffer x = b.asCharBuffer(); |
| for (int i = 0; i < iterations; i++) { |
| int sum = 0; |
| for (int j = 0, end = x.limit(); j < end; j++) |
| sum += x.get(j); |
| deoptimize(sum);}}}, |
| new Job("swap short BIG_ENDIAN") { |
| public void work() throws Throwable { |
| b.order(ByteOrder.BIG_ENDIAN); |
| ShortBuffer x = b.asShortBuffer(); |
| for (int i = 0; i < iterations; i++) { |
| int sum = 0; |
| for (int j = 0, end = x.limit(); j < end; j++) |
| sum += x.get(j); |
| deoptimize(sum);}}}, |
| new Job("swap short LITTLE_ENDIAN") { |
| public void work() throws Throwable { |
| b.order(ByteOrder.LITTLE_ENDIAN); |
| ShortBuffer x = b.asShortBuffer(); |
| for (int i = 0; i < iterations; i++) { |
| int sum = 0; |
| for (int j = 0, end = x.limit(); j < end; j++) |
| sum += x.get(j); |
| deoptimize(sum);}}}, |
| new Job("swap int BIG_ENDIAN") { |
| public void work() throws Throwable { |
| b.order(ByteOrder.BIG_ENDIAN); |
| IntBuffer x = b.asIntBuffer(); |
| for (int i = 0; i < iterations; i++) { |
| int sum = 0; |
| for (int j = 0, end = x.limit(); j < end; j++) |
| sum += x.get(j); |
| deoptimize(sum);}}}, |
| new Job("swap int LITTLE_ENDIAN") { |
| public void work() throws Throwable { |
| b.order(ByteOrder.LITTLE_ENDIAN); |
| IntBuffer x = b.asIntBuffer(); |
| for (int i = 0; i < iterations; i++) { |
| int sum = 0; |
| for (int j = 0, end = x.limit(); j < end; j++) |
| sum += x.get(j); |
| deoptimize(sum);}}}, |
| new Job("swap long BIG_ENDIAN") { |
| public void work() throws Throwable { |
| b.order(ByteOrder.BIG_ENDIAN); |
| LongBuffer x = b.asLongBuffer(); |
| for (int i = 0; i < iterations; i++) { |
| int sum = 0; |
| for (int j = 0, end = x.limit(); j < end; j++) |
| sum += x.get(j); |
| deoptimize(sum);}}}, |
| new Job("swap long LITTLE_ENDIAN") { |
| public void work() throws Throwable { |
| b.order(ByteOrder.LITTLE_ENDIAN); |
| LongBuffer x = b.asLongBuffer(); |
| for (int i = 0; i < iterations; i++) { |
| int sum = 0; |
| for (int j = 0, end = x.limit(); j < end; j++) |
| sum += x.get(j); |
| deoptimize(sum);}}} |
| }; |
| |
| time(filter(filter, jobs)); |
| } |
| } |