1 /* 2 * Copyright (c) 2017, 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 8184765 27 * @summary make sure the SystemDictionary gets resized when load factor is too high 28 * @library /test/lib 29 * @modules java.base/jdk.internal.misc 30 * java.management 31 * @compile TriggerResize.java 32 * @run driver TestResize 33 */ 34 35 import java.lang.ProcessBuilder; 36 import java.lang.Process; 37 import jdk.test.lib.process.ProcessTools; 38 import java.io.BufferedReader; 39 import java.io.InputStreamReader; 40 import java.util.Scanner; 41 42 public class TestResize { 43 44 static double MAX_LOAD_FACTOR = 5.0; // see _resize_load_trigger in dictionary.cpp 45 46 static int getInt(String string) { 47 int start = 0; 48 for (int i = 0; i < string.length(); i++) { 49 if (!Character.isDigit(string.charAt(i))) { 50 start++; 51 } else { 52 break; 53 } 54 } 55 int end = start; 56 for (int i = end; i < string.length(); i++) { 57 if (Character.isDigit(string.charAt(i))) { 58 end++; 59 } else { 60 break; 61 } 62 } 63 return Integer.parseInt(string.substring(start, end)); 64 } 65 66 static void analyzeOutputOn(ProcessBuilder pb) throws Exception { 67 pb.redirectErrorStream(true); 68 Process process = pb.start(); 69 BufferedReader rd = new BufferedReader(new InputStreamReader(process.getInputStream())); 70 String line = rd.readLine(); 71 while (line != null) { 72 if (line.startsWith("Java dictionary (")) { 73 // ex. "Java dictionary (table_size=107, classes=6)" 74 // ex. "Java dictionary (table_size=20201, classes=50002)" 75 Scanner scanner = new Scanner(line); 76 scanner.next(); 77 scanner.next(); 78 int table_size = getInt(scanner.next()); 79 int classes = getInt(scanner.next()); 80 scanner.close(); 81 82 double loadFactor = (double)classes / (double)table_size; 83 if (loadFactor > MAX_LOAD_FACTOR) { 84 throw new RuntimeException("Load factor too high, expected MAX "+MAX_LOAD_FACTOR+", got "+loadFactor); 85 } else { 86 System.out.println("PASS table_size:"+table_size+", classes:"+classes+" OK"); 87 } 88 } 89 line = rd.readLine(); 90 } 91 int retval = process.waitFor(); 92 if (retval != 0) { 93 throw new RuntimeException("Error: test returned non-zero value"); 94 } 95 } 96 97 public static void main(String[] args) throws Exception { 98 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+PrintSystemDictionaryAtExit", 99 "TriggerResize", 100 "50000"); 101 analyzeOutputOn(pb); 102 } 103 }