Quelle TestResize.java Sprache: JAVA

/*
* Copyright (c) 2017, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

/*
* @test
* @bug 8184765
* @summary make sure the SystemDictionary gets resized when load factor is too high
* @requires vm.debug
* @requires vm.flagless
* @library /test/lib
* @modules java.base/jdk.internal.misc
*          java.management
* @compile TriggerResize.java
* @run driver TestResize
*/

import jdk.test.lib.Platform;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.lang.Process;
import java.lang.ProcessBuilder;
import java.util.Scanner;

public class TestResize {

  static double MAX_LOAD_FACTOR = 5.0; // see _resize_load_trigger in dictionary.cpp
  static int CLASSES_TO_LOAD = 30000;

  static int getInt(String string) {
    int start = 0;
    for (int i = 0; i < string.length(); i++) {
      if (!Character.isDigit(string.charAt(i))) {
        start++;
      } else {
        break;
      }
    }
    int end = start;
    for (int i = end; i < string.length(); i++) {
      if (Character.isDigit(string.charAt(i))) {
        end++;
      } else {
        break;
      }
    }
    return Integer.parseInt(string.substring(start, end));
  }

  static void analyzeOutputOn(ProcessBuilder pb) throws Exception {
    OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());
    String output = analyzer.getStdout();
    analyzer.shouldHaveExitValue(0);

    boolean resized = false;
    boolean checked_load_factor = false;

    // Split string into lines using platform independent end of line marker.
    String[] lines = output.split("\\R");
    for (String line : lines) {
      if (!resized) {
        // ex. [0.563s][info][safepoint,cleanup] resizing system dictionaries, 0.0000002 secs
        if (line.contains("resizing system dictionaries")) {
          resized = true;
        }
      } else if (resized) {
        int index = -1;
        if ((index = line.indexOf("Java dictionary (")) != -1) {
          // ex. Java dictionary (table_size=10103, classes=5002)
          String dict = line.substring(index);
          Scanner scanner = new Scanner(dict);
          scanner.next(); // skip "Java"
          scanner.next(); // skip "dictionary"
          int table_size = getInt(scanner.next()); // process "(table_size=40423"
          int classes = getInt(scanner.next()); // process ", classes=50002"
          scanner.close();

          checked_load_factor = classes >= CLASSES_TO_LOAD;

          double loadFactor = (double)classes / (double)table_size;
          if (loadFactor > MAX_LOAD_FACTOR) {

            // We've hit an error, so print all of the output.
            System.out.println(output);

            throw new RuntimeException("Load factor too high, expected MAX " + MAX_LOAD_FACTOR +
                  ", got " + loadFactor + " [table size " + table_size + ", number of clases " + classes + "]");
          } else {
            checked_load_factor = true;
            System.out.println("PASS table_size: " + table_size + ", classes: " + classes +
                ", load factor: " + loadFactor + " <= " + MAX_LOAD_FACTOR);
                // There are more than one system dictionary to check, so keep looking...
          }
        }
      }
    }

    if (!resized) {
      System.out.println("PASS trivially. No resizing occurred, so did not check the load.");
    } else {
      // Make sure the load factor was checked
      if (!checked_load_factor) {
        throw new RuntimeException("Test didn't check load factor");
      }
    }
  }

  public static void main(String[] args) throws Exception {
    // -XX:+PrintClassLoaderDataGraphAtExit will print the summary of the dictionaries,
    // that will allow us to calculate the table's load factor.
    // -Xlog:safepoint+cleanup will print out cleanup details at safepoint
    // that will allow us to detect if the system dictionary resized.
    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+PrintClassLoaderDataGraphAtExit",
                                                              "-Xlog:safepoint+cleanup,class+loader+data",
                                                              "TriggerResize",
                                                              String.valueOf(CLASSES_TO_LOAD));
    analyzeOutputOn(pb);
  }
}

quality89%

¤ Dauer der Verarbeitung: 0.11 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.