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comparison test/runtime/7158800/InternTest.java @ 6162:e9140bf80b4a

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7158800: Improve storage of symbol tables Summary: Use an alternate version of hashing algorithm for symbol string tables and after a certain bucket size to improve performance Reviewed-by: pbk, kamg, dlong, kvn, fparain
author coleenp
date Wed, 13 Jun 2012 19:52:59 -0400
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6129:4d399f013e5a 6162:e9140bf80b4a
1 /*
2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test
26 * @bug 7158800
27 * @run shell/timeout=400 Test7158800.sh
28 * @summary This test performs poorly if alternate hashing isn't used for
29 * string table.
30 * The timeout is handled by the shell file (which kills the process)
31 */
32 import java.util.*;
33 import java.io.*;
34
35 public class InternTest {
36 public static void main (String args[]) throws Exception {
37 final String badStringsFilename = "badstrings.txt";
38
39 if (args.length == 0 || (!args[0].equals("bad") && !args[0].equals("normal"))) {
40 System.out.println("Usage: java InternTest [normal|bad]");
41 System.exit(1);
42 }
43
44 FileInputStream fstream = new FileInputStream(badStringsFilename);
45 DataInputStream in = new DataInputStream(fstream);
46 BufferedReader br = new BufferedReader(new InputStreamReader(in));
47 String toIntern, toDiscard;
48 int count = 0;
49 long current = 0L;
50 long last = System.currentTimeMillis();
51
52 if (args[0].equals("bad")) {
53 while ((toIntern = br.readLine()) != null) {
54 toDiscard = new String((new Integer((int)(Math.random() * Integer.MAX_VALUE))).toString());
55 toIntern.intern();
56 count++;
57 if (count % 10000 == 0 && count != 0) {
58 current = System.currentTimeMillis();
59 System.out.println(new Date(current) + ": interned " + count + " 0-hash strings - last 10000 took " + ((float)(current - last))/1000 + "s (" + ((float)(current - last))/10000000 + "s per String)");
60 last = current;
61 }
62 }
63 }
64 if (args[0].equals("normal")) {
65 while ((toDiscard = br.readLine()) != null) { // do the same read from the file to try and make the test fair
66 toIntern = new String((new Integer((int)(Math.random() * Integer.MAX_VALUE))).toString());
67 toIntern.intern();
68 count++;
69 if (count % 10000 == 0 && count != 0) {
70 current = System.currentTimeMillis();
71 System.out.println(new Date(current) + ": interned " + count + " normal strings - last 10000 took " + ((float)(current - last))/1000 + "s (" + ((float)(current - last))/10000000 + "s per String)");
72 last = current;
73 }
74 }
75 }
76 in.close();
77 }
78 }
79
80