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jsr166 |
1.1 |
/* |
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* Copyright 2009 Google Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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jsr166 |
1.2 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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jsr166 |
1.1 |
*/ |
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import java.util.Arrays; |
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public class SortPerf { |
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private static final int NUM_SETS = 5; |
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private static final int[] lengths = { 10, 100, 1000, 10000, 1000000 }; |
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// Returns the number of repetitions as a function of the list length |
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private static int reps(int n) { |
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return (int) (12000000 / (n * Math.log10(n))); |
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} |
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public static void main(String[] args) { |
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Sorter.warmup(); |
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System.out.print("Strategy,Length"); |
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for (Sorter sorter : Sorter.values()) |
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System.out.print("," + sorter); |
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System.out.println(); |
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for (ArrayBuilder ab : ArrayBuilder.values()) { |
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for (int n : lengths) { |
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System.out.printf("%s,%d", ab, n); |
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int reps = reps(n); |
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Object[] proto = ab.build(n); |
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for (Sorter sorter : Sorter.values()) { |
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double minTime = Double.POSITIVE_INFINITY; |
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for (int set = 0; set < NUM_SETS; set++) { |
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long startTime = System.nanoTime(); |
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for (int k = 0; k < reps; k++) { |
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Object[] a = proto.clone(); |
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sorter.sort(a); |
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} |
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long endTime = System.nanoTime(); |
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double time = (endTime - startTime) / (1000000. * reps); |
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minTime = Math.min(minTime, time); |
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} |
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System.out.printf(",%5f", minTime); |
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} |
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System.out.println(); |
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} |
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} |
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} |
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} |
