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import java.util.*; |
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import java.io.*; |
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|
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public class MapWordLoops { |
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|
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static final String[] WORDS_FILES = { |
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"kw.txt", |
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"class.txt", |
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"dir.txt", |
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"ids.txt", |
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"/usr/dict/words", |
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}; |
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|
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static final int MAX_WORDS = 500000; |
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static final int pinsert = 60; |
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static final int premove = 1; |
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static final int NOPS = 5000000; |
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static final int numTests = 3; |
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|
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public static void main(String[] args) { |
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Class mapClass = null; |
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try { |
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mapClass = Class.forName(args[0]); |
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} catch(ClassNotFoundException e) { |
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throw new RuntimeException("Class " + args[0] + " not found."); |
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} |
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|
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System.out.println("Testing " + mapClass.getName()); |
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|
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for (int s = 0; s < WORDS_FILES.length; ++s) |
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tests(mapClass, numTests, s); |
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|
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for (int s = WORDS_FILES.length-1; s >= 0; --s) |
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tests(mapClass, numTests, s); |
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|
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} |
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|
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static void tests(Class mapClass, int numTests, int sizeIndex) { |
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try { |
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String[] key = readWords(sizeIndex); |
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int size = key.length; |
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|
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System.out.print("n = " +LoopHelpers.rightJustify(size) +" : "); |
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long least = Long.MAX_VALUE; |
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|
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for (int i = 0; i < numTests; ++i) { |
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Map<String,String> m = newMap(mapClass); |
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long t = doTest(mapClass.getName(), m, key); |
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if (t < least) least = t; |
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m.clear(); |
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m = null; |
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} |
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|
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long nano = Math.round(1000000.0 * (least) / NOPS); |
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System.out.println(LoopHelpers.rightJustify(nano) + " ns per op"); |
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} catch (IOException ignore) { |
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return; // skip test if can't read file |
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} |
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} |
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|
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|
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static Map<String,String> newMap(Class cl) { |
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try { |
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Map m = (Map<String,String>)cl.newInstance(); |
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return m; |
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} catch(Exception e) { |
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throw new RuntimeException("Can't instantiate " + cl + ": " + e); |
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} |
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} |
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|
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static void pause() { |
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try { Thread.sleep(100); } catch(InterruptedException ie) { return; } |
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} |
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|
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static String[] readWords(int sizeIndex) throws IOException { |
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String[] l = new String[MAX_WORDS]; |
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String[] array = null; |
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try { |
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FileReader fr = new FileReader(WORDS_FILES[sizeIndex]); |
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BufferedReader reader = new BufferedReader(fr); |
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int k = 0; |
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for (;;) { |
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String s = reader.readLine(); |
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if (s == null) break; |
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l[k++] = s; |
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} |
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array = new String[k]; |
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for (int i = 0; i < k; ++i) { |
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array[i] = l[i]; |
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l[i] = null; |
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} |
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l = null; |
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reader.close(); |
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} |
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catch (IOException ex) { |
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System.out.println("Can't read words file:" + ex); |
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throw ex; |
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} |
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return array; |
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} |
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|
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static long doTest(String name, |
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final Map<String,String> m, |
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final String[] key) { |
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|
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// System.out.print(name + "\t"); |
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Runner runner = new Runner(m, key); |
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long startTime = System.currentTimeMillis(); |
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runner.run(); |
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long afterRun = System.currentTimeMillis(); |
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long runTime = (afterRun - startTime); |
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int np = runner.total; |
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if (runner.total == runner.hashCode()) |
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System.out.println("Useless Number" + runner.total); |
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int sz = runner.maxsz; |
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if (sz == runner.hashCode()) |
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System.out.println("Useless Number" + sz); |
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// System.out.print(" m = " + sz); |
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return runTime; |
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} |
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|
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|
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static class Runner implements Runnable { |
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final Map<String,String> map; |
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final String[] key; |
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LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom(); |
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final int pctrem; |
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final int pctins; |
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int nputs = 0; |
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int npgets = 0; |
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int nagets = 0; |
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int nremoves = 0; |
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volatile int total; |
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int maxsz; |
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|
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Runner(Map<String,String> m, String[] k) { |
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map = m; key = k; |
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pctrem = (int)(((long)premove * (long)(Integer.MAX_VALUE/2)) / 50); |
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pctins = (int)(((long)pinsert * (long)(Integer.MAX_VALUE/2)) / 50); |
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} |
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|
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|
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int oneStep(int j) { |
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int n = key.length; |
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int r = rng.next() & 0x7FFFFFFF; |
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int jinc = (r & 7); |
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j += jinc - 3; |
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if (j >= n) j -= n; |
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if (j < 0) j += n; |
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|
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int l = n / 4 + j; |
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if (l >= n) l -= n; |
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|
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String k = key[j]; |
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String x = map.get(k); |
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|
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if (x == null) { |
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++nagets; |
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if (r < pctins) { |
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map.put(k, key[l]); |
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++nputs; |
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int csz = nputs - nremoves; |
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if (csz > maxsz) maxsz = csz; |
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} |
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} |
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else { |
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if (k== x) ++npgets; |
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if (r < pctrem) { |
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map.remove(k); |
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++nremoves; |
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j += ((r >>> 8) & 7) + n / 2; |
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if (j >= n) j -= n; |
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} |
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} |
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return j; |
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} |
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|
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public void run() { |
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int j = key.length / 2; |
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for (int i = 0; i < NOPS; ++i) { |
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j = oneStep(j); |
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} |
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total = nputs + npgets + nagets + nremoves; |
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} |
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} |
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|
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} |
