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comparison test/gc/g1/TestStringSymbolTableStats.java @ 14303:893ce66f7473

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8027476: Improve performance of Stringtable unlink 8027455: Improve symbol table scan times during gc pauses Summary: Parallelize string table and symbol table scan during remark and full GC. Some additional statistics output if the experimental flag G1TraceStringSymbolTableScrubbing is set. Reviewed-by: mgerdin, coleenp, brutisso
author tschatzl
date Mon, 20 Jan 2014 11:47:07 +0100
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14265:3e2b76368121 14303:893ce66f7473
1 /*
2 * Copyright (c) 2013, 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 TestStringSymbolTableStats.java
26 * @bug 8027476 8027455
27 * @summary Ensure that the G1TraceStringSymbolTableScrubbing prints the expected message.
28 * @key gc
29 * @library /testlibrary
30 */
31
32 import com.oracle.java.testlibrary.ProcessTools;
33 import com.oracle.java.testlibrary.OutputAnalyzer;
34
35 public class TestStringSymbolTableStats {
36 public static void main(String[] args) throws Exception {
37
38 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",
39 "-XX:+UnlockExperimentalVMOptions",
40 "-XX:+G1TraceStringSymbolTableScrubbing",
41 SystemGCTest.class.getName());
42
43 OutputAnalyzer output = new OutputAnalyzer(pb.start());
44
45 System.out.println("Output:\n" + output.getOutput());
46
47 output.shouldContain("Cleaned string and symbol table");
48 output.shouldHaveExitValue(0);
49 }
50
51 static class SystemGCTest {
52 public static void main(String [] args) {
53 System.out.println("Calling System.gc()");
54 System.gc();
55 }
56 }
57 }