--- /dev/null 2017-11-01 11:21:51.000000000 -0500 +++ new/test/hotspot/jtreg/runtime/LoadClass/TestResize.java 2017-11-01 11:21:51.000000000 -0500 @@ -0,0 +1,103 @@ +/* + * Copyright (c) 2017, 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 + * @library /test/lib + * @modules java.base/jdk.internal.misc + * java.management + * @compile TriggerResize.java + * @run driver TestResize + */ + +import java.lang.ProcessBuilder; +import java.lang.Process; +import jdk.test.lib.process.ProcessTools; +import java.io.BufferedReader; +import java.io.InputStreamReader; +import java.util.Scanner; + +public class TestResize { + + static double MAX_LOAD_FACTOR = 5.0; // see _resize_load_trigger in dictionary.cpp + + 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 { + pb.redirectErrorStream(true); + Process process = pb.start(); + BufferedReader rd = new BufferedReader(new InputStreamReader(process.getInputStream())); + String line = rd.readLine(); + while (line != null) { + if (line.startsWith("Java dictionary (")) { + // ex. "Java dictionary (table_size=107, classes=6)" + // ex. "Java dictionary (table_size=20201, classes=50002)" + Scanner scanner = new Scanner(line); + scanner.next(); + scanner.next(); + int table_size = getInt(scanner.next()); + int classes = getInt(scanner.next()); + scanner.close(); + + double loadFactor = (double)classes / (double)table_size; + if (loadFactor > MAX_LOAD_FACTOR) { + throw new RuntimeException("Load factor too high, expected MAX "+MAX_LOAD_FACTOR+", got "+loadFactor); + } else { + System.out.println("PASS table_size:"+table_size+", classes:"+classes+" OK"); + } + } + line = rd.readLine(); + } + int retval = process.waitFor(); + if (retval != 0) { + throw new RuntimeException("Error: test returned non-zero value"); + } + } + + public static void main(String[] args) throws Exception { + ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+PrintSystemDictionaryAtExit", + "TriggerResize", + "50000"); + analyzeOutputOn(pb); + } +}