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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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import java.util.*; |
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* and long iterators. Reports include times for adds and other |
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* checks, so overestimate times per iteration. |
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*/ |
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public final class IteratorLoops { |
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static final int DEFAULT_SIZE = 16384; |
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static final int DEFAULT_TRIALS = 2; |
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static final int DEFAULT_TRIALS = 4; |
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static final int NC = 16; // number of collections must be power of 2 |
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static volatile long mismatches = 0; |
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static int randomSeed = 3122688; |
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public static void main(String[] args) throws Exception { |
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Class klass = Class.forName(args[0]); |
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int n = (args.length <= 1)? DEFAULT_SIZE : Integer.parseInt(args[1]); |
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int t = (args.length <= 2)? DEFAULT_TRIALS : Integer.parseInt(args[2]); |
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Class<?> klass = Class.forName(args[0]); |
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int n = (args.length <= 1) ? DEFAULT_SIZE : Integer.parseInt(args[1]); |
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int t = (args.length <= 2) ? DEFAULT_TRIALS : Integer.parseInt(args[2]); |
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System.out.print("Class: " + klass.getName()); |
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System.out.print(" ~iters: " + (long)n * (long)n); |
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System.out.print(" ~iters: " + (long) n * (long) n); |
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System.out.print(" trials: " + t); |
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System.out.println(); |
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Collection<Integer>[] colls = |
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(Collection<Integer>[])new Collection[NC]; |
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for (int k = 0; k < colls.length; ++k) |
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colls[k] = (Collection<Integer>)klass.newInstance(); |
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for (int k = 0; k < colls.length; ++k) { |
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Object x = klass.newInstance(); |
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if (x instanceof Collection) |
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colls[k] = (Collection<Integer>) x; |
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else if (x instanceof Map) |
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colls[k] = (Collection<Integer>) |
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Collections.newSetFromMap((Map) x); |
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else |
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throw new Error("bad class"); |
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} |
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for (int i = 0; i < t; ++i) |
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new IteratorLoops(colls).oneRun(n); |
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preload(n); |
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long startTime = System.nanoTime(); |
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long count = traversals(n); |
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double elapsed = (double)(System.nanoTime() - startTime); |
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double elapsed = (double) (System.nanoTime() - startTime); |
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double npi = elapsed / count; |
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double secs = elapsed / 1000000000; |
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System.out.printf("%7.1f ns/iter %8.3fs run time\n", npi, secs); |
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long traversals(int n) { |
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long count = 0; |
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long check = 0; |
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for (int i = 0; i < n; i++) { |
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for (int i = 0; i < n; i++) { |
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check += elementCount; |
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count += counts(); |
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maybeAdd(); |
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k >>>= 1; |
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} |
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// let GC settle down |
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try { Thread.sleep(500); } catch(Exception ex) { return; } |
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try { Thread.sleep(500); } |
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catch (Exception ex) { return; } |
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} |
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} |