141 lines
5.3 KiB
Java
141 lines
5.3 KiB
Java
/*
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* Copyright (c) 2017, 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8184765
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* @summary make sure the SystemDictionary gets resized when load factor is too high
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* @requires vm.debug
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* @requires vm.flagless
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* @library /test/lib
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* @modules java.base/jdk.internal.misc
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* java.management
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* @compile TriggerResize.java
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* @run driver TestResize
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*/
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import jdk.test.lib.Platform;
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.process.ProcessTools;
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import java.io.BufferedReader;
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import java.io.InputStreamReader;
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import java.lang.Process;
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import java.lang.ProcessBuilder;
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import java.util.Scanner;
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public class TestResize {
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static double MAX_LOAD_FACTOR = 5.0; // see _resize_load_trigger in dictionary.cpp
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static int CLASSES_TO_LOAD = 30000;
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static int getInt(String string) {
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int start = 0;
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for (int i = 0; i < string.length(); i++) {
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if (!Character.isDigit(string.charAt(i))) {
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start++;
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} else {
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break;
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}
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}
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int end = start;
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for (int i = end; i < string.length(); i++) {
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if (Character.isDigit(string.charAt(i))) {
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end++;
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} else {
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break;
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}
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}
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return Integer.parseInt(string.substring(start, end));
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}
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static void analyzeOutputOn(ProcessBuilder pb) throws Exception {
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OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());
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String output = analyzer.getStdout();
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analyzer.shouldHaveExitValue(0);
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boolean resized = false;
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boolean checked_load_factor = false;
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// Split string into lines using platform independent end of line marker.
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String[] lines = output.split("\\R");
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for (String line : lines) {
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if (!resized) {
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// ex. [0.563s][info][safepoint,cleanup] resizing system dictionaries, 0.0000002 secs
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if (line.contains("resizing system dictionaries")) {
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resized = true;
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}
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} else if (resized) {
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int index = -1;
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if ((index = line.indexOf("Java dictionary (")) != -1) {
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// ex. Java dictionary (table_size=10103, classes=5002)
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String dict = line.substring(index);
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Scanner scanner = new Scanner(dict);
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scanner.next(); // skip "Java"
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scanner.next(); // skip "dictionary"
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int table_size = getInt(scanner.next()); // process "(table_size=40423"
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int classes = getInt(scanner.next()); // process ", classes=50002"
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scanner.close();
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checked_load_factor = classes >= CLASSES_TO_LOAD;
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double loadFactor = (double)classes / (double)table_size;
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if (loadFactor > MAX_LOAD_FACTOR) {
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// We've hit an error, so print all of the output.
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System.out.println(output);
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throw new RuntimeException("Load factor too high, expected MAX " + MAX_LOAD_FACTOR +
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", got " + loadFactor + " [table size " + table_size + ", number of clases " + classes + "]");
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} else {
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checked_load_factor = true;
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System.out.println("PASS table_size: " + table_size + ", classes: " + classes +
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", load factor: " + loadFactor + " <= " + MAX_LOAD_FACTOR);
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// There are more than one system dictionary to check, so keep looking...
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}
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}
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}
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}
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if (!resized) {
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System.out.println("PASS trivially. No resizing occurred, so did not check the load.");
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} else {
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// Make sure the load factor was checked
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if (!checked_load_factor) {
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throw new RuntimeException("Test didn't check load factor");
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}
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}
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}
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public static void main(String[] args) throws Exception {
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// -XX:+PrintClassLoaderDataGraphAtExit will print the summary of the dictionaries,
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// that will allow us to calculate the table's load factor.
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// -Xlog:safepoint+cleanup will print out cleanup details at safepoint
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// that will allow us to detect if the system dictionary resized.
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ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:+PrintClassLoaderDataGraphAtExit",
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"-Xlog:safepoint+cleanup,class+loader+data",
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"TriggerResize",
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String.valueOf(CLASSES_TO_LOAD));
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analyzeOutputOn(pb);
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}
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}
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