1 /* 2 * Copyright (c) 2016, 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 TestDynamicGCThreadsStats 26 * @bug 8176140 27 * @summary Check that G1 reports per thread statistics. 28 * @requires vm.gc=="G1" | vm.gc=="null" 29 * @key gc 30 * @library /testlibrary /test/lib 31 * @build sun.hotspot.WhiteBox 32 * @run main ClassFileInstaller sun.hotspot.WhiteBox 33 * @run driver TestDynamicGCThreadsStats 34 */ 35 36 import sun.hotspot.WhiteBox; 37 38 import java.text.DecimalFormatSymbols; 39 import java.util.regex.Matcher; 40 import java.util.regex.Pattern; 41 42 import jdk.test.lib.OutputAnalyzer; 43 import jdk.test.lib.Platform; 44 import jdk.test.lib.ProcessTools; 45 46 import static jdk.test.lib.Asserts.*; 47 48 public class TestDynamicGCThreadsStats { 49 50 public static void runTest() throws Exception { 51 final String[] arguments = { 52 "-Xbootclasspath/a:.", 53 "-XX:+UnlockExperimentalVMOptions", 54 "-XX:+UnlockDiagnosticVMOptions", 55 "-XX:+UseDynamicNumberOfGCThreads", 56 "-XX:+WhiteBoxAPI", 57 "-XX:+UseG1GC", 58 "-Xlog:gc*=trace", 59 "-Xmx10M", 60 GCTest.class.getName() 61 }; 62 63 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(arguments); 64 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 65 66 output.shouldHaveExitValue(0); 67 68 // Looking for: 69 // [0.234s][debug ][gc,phases ] GC(0) Evacuate Collection Set: 3.7 ms 70 output.shouldMatch("Evacuate Collection Set: \\d+\\.\\d+ms"); 71 // Find data with per thread times. 72 // Any of the metrics with per thread times can be used. 73 // Chose: 74 // [0.234s][debug ][gc,phases ] GC(0) Ext Root Scanning: Min: 0.6, Avg: 1.1, Max: 1.6, Diff: 1.0, Sum: 2.2 75 String stats = "Ext Root Scanning \\(ms\\):"; 76 Pattern stats_pattern = Pattern.compile(stats); 77 output.shouldMatch("Ext Root Scanning \\(ms\\):"); 78 // Find the printed average from the log. 79 String std_out = output.getStdout(); 80 String avg_line = "(Avg: +)(\\d+\\.\\d+)(,)"; 81 Matcher m = Pattern.compile(avg_line, Pattern.MULTILINE).matcher(std_out); 82 if (!m.find()) { 83 throw new Exception("Could not find Avg: dd.d in stdout\n," + output.getStdout()); 84 } 85 String value_string = m.group(2); 86 // Count the decimal places in the printed average. The 87 // number of decimal places will be used to calculate the 88 // rounding error when the per thread values are summed in 89 // this test. 90 DecimalFormatSymbols symbols = DecimalFormatSymbols.getInstance(); 91 char decimal_symbol = symbols.getDecimalSeparator(); 92 String decimal_places_string = value_string.substring(value_string.indexOf(decimal_symbol) + 1); 93 int decimal_points = decimal_places_string.length(); 94 double avg_value = 0.0; 95 try { 96 avg_value = Double.parseDouble(value_string); 97 } catch (java.lang.NumberFormatException e) { 98 System.out.println("Non Number Format - " + value_string); 99 } 100 // Go to the next line which will have a "GC" in it. For 101 // example: 102 // [0.234s][trace ][gc,phases ] GC(0) 1.58 0.58 103 Pattern GC_pattern = Pattern.compile("GC"); 104 m.usePattern(GC_pattern); 105 if (m.find()) { 106 String[] per_thread_values = std_out.substring(m.end()).split(System.lineSeparator(), 2); 107 String value_regex = " +\\d+\\.\\d+"; 108 Matcher value_m = Pattern.compile(value_regex, Pattern.MULTILINE).matcher(per_thread_values[0]); 109 int workers = 0; 110 Double sum = 0.0; 111 // Count and sum the values. Note that each parsed value has rounding error in it. 112 while (value_m.find()) { 113 try { 114 Double value = Double.parseDouble(value_m.group()); 115 sum += value; 116 workers++; 117 } catch (java.lang.NumberFormatException e) { 118 System.out.println("Non Number Format - " + m.group()); 119 } 120 } 121 if (workers > 0) { 122 Double calculated_avg = sum / workers; 123 // Rounding error in per thread data 124 Double rounding_error = workers * 0.5 * Math.pow(10.0, -decimal_points); 125 if (Math.abs(calculated_avg - avg_value) > rounding_error) { 126 throw new Exception("Average from log " + avg_value + " and average calculated by test " + 127 calculated_avg + " can differ by rounding error " + rounding_error); 128 } else { 129 System.err.println("PASSED: Average from log " + avg_value + " and average calculated by test " + 130 calculated_avg + " can differ by rounding error " + rounding_error); 131 } 132 } 133 } 134 } 135 136 public static void main(String[] args) throws Exception { 137 runTest(); 138 } 139 140 static class GCTest { 141 public static void main(String [] args) { 142 int numGCs = 4; 143 144 // Perform the requested amount of GCs. 145 WhiteBox wb = WhiteBox.getWhiteBox(); 146 for (int i = 0; i < numGCs - 1; i++) { 147 wb.youngGC(); 148 } 149 if (numGCs > 0) { 150 wb.fullGC(); 151 } 152 System.out.println("Done"); 153 } 154 } 155 } 156