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annotate test/runtime/memory/LargePages/TestLargePagesFlags.java @ 12832:263f2c796d6c

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8024838: Significant slowdown due to transparent huge pages Summary: Don't turn on transparent huge pages (-XX:+UseTransparentHugePages) unless explicitly specified on the command line. This has the effect that large pages are never turned on Linux unless the user has explicitly enabled any of the large pages flags: -XX:+UseLargePages, -XX:+UseTransparentHugePages, -XX:+UseHugeTLBFS, and -XX:+UseSHM. Reviewed-by: jwilhelm, tschatzl, brutisso
author stefank
date Sat, 05 Oct 2013 10:14:58 +0200
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12832
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1 /*
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /* @test TestLargePagesFlags
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25 * @summary Tests how large pages are choosen depending on the given large pages flag combinations.
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26 * @library /testlibrary
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27 * @run main TestLargePagesFlags
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28 */
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29
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30 import com.oracle.java.testlibrary.OutputAnalyzer;
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31 import com.oracle.java.testlibrary.Platform;
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32 import com.oracle.java.testlibrary.ProcessTools;
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33 import java.util.ArrayList;
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34
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35 public class TestLargePagesFlags {
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36
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37 public static void main(String [] args) throws Exception {
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38 if (!Platform.isLinux()) {
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39 System.out.println("Skipping. TestLargePagesFlags has only been implemented for Linux.");
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40 return;
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41 }
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42
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43 testUseTransparentHugePages();
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44 testUseHugeTLBFS();
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45 testUseSHM();
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46 testCombinations();
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47 }
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48
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49 public static void testUseTransparentHugePages() throws Exception {
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50 if (!canUse(UseTransparentHugePages(true))) {
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51 System.out.println("Skipping testUseTransparentHugePages");
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52 return;
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53 }
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54
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55 // -XX:-UseLargePages overrides all other flags.
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56 new FlagTester()
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57 .use(UseLargePages(false),
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58 UseTransparentHugePages(true))
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59 .expect(
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60 UseLargePages(false),
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61 UseTransparentHugePages(false),
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62 UseHugeTLBFS(false),
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63 UseSHM(false));
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64
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65 // Explicitly turn on UseTransparentHugePages.
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66 new FlagTester()
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67 .use(UseTransparentHugePages(true))
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68 .expect(
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69 UseLargePages(true),
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70 UseTransparentHugePages(true),
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71 UseHugeTLBFS(false),
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72 UseSHM(false));
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73
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74 new FlagTester()
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75 .use(UseLargePages(true),
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76 UseTransparentHugePages(true))
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77 .expect(
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78 UseLargePages(true),
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79 UseTransparentHugePages(true),
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80 UseHugeTLBFS(false),
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81 UseSHM(false));
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82
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83 // Setting a specific large pages flag will turn
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84 // off heuristics to choose large pages type.
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85 new FlagTester()
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86 .use(UseLargePages(true),
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87 UseTransparentHugePages(false))
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88 .expect(
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89 UseLargePages(false),
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90 UseTransparentHugePages(false),
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91 UseHugeTLBFS(false),
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92 UseSHM(false));
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93
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94 // Don't turn on UseTransparentHugePages
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95 // unless the user explicitly asks for them.
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96 new FlagTester()
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97 .use(UseLargePages(true))
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98 .expect(
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99 UseTransparentHugePages(false));
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100 }
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101
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102 public static void testUseHugeTLBFS() throws Exception {
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103 if (!canUse(UseHugeTLBFS(true))) {
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104 System.out.println("Skipping testUseHugeTLBFS");
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105 return;
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106 }
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107
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108 // -XX:-UseLargePages overrides all other flags.
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109 new FlagTester()
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110 .use(UseLargePages(false),
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111 UseHugeTLBFS(true))
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112 .expect(
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113 UseLargePages(false),
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114 UseTransparentHugePages(false),
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115 UseHugeTLBFS(false),
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116 UseSHM(false));
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117
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118 // Explicitly turn on UseHugeTLBFS.
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119 new FlagTester()
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120 .use(UseHugeTLBFS(true))
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121 .expect(
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122 UseLargePages(true),
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123 UseTransparentHugePages(false),
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124 UseHugeTLBFS(true),
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125 UseSHM(false));
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126
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127 new FlagTester()
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128 .use(UseLargePages(true),
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129 UseHugeTLBFS(true))
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130 .expect(
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131 UseLargePages(true),
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132 UseTransparentHugePages(false),
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133 UseHugeTLBFS(true),
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134 UseSHM(false));
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135
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136 // Setting a specific large pages flag will turn
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137 // off heuristics to choose large pages type.
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138 new FlagTester()
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139 .use(UseLargePages(true),
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140 UseHugeTLBFS(false))
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141 .expect(
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142 UseLargePages(false),
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143 UseTransparentHugePages(false),
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144 UseHugeTLBFS(false),
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145 UseSHM(false));
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146
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147 // Using UseLargePages will default to UseHugeTLBFS large pages.
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148 new FlagTester()
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149 .use(UseLargePages(true))
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150 .expect(
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151 UseLargePages(true),
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152 UseTransparentHugePages(false),
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153 UseHugeTLBFS(true),
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154 UseSHM(false));
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155 }
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156
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157 public static void testUseSHM() throws Exception {
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158 if (!canUse(UseSHM(true))) {
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159 System.out.println("Skipping testUseSHM");
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160 return;
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161 }
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162
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163 // -XX:-UseLargePages overrides all other flags.
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164 new FlagTester()
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165 .use(UseLargePages(false),
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166 UseSHM(true))
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167 .expect(
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168 UseLargePages(false),
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169 UseTransparentHugePages(false),
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170 UseHugeTLBFS(false),
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171 UseSHM(false));
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172
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173 // Explicitly turn on UseSHM.
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174 new FlagTester()
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175 .use(UseSHM(true))
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176 .expect(
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177 UseLargePages(true),
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178 UseTransparentHugePages(false),
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179 UseHugeTLBFS(false),
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180 UseSHM(true)) ;
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181
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182 new FlagTester()
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183 .use(UseLargePages(true),
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184 UseSHM(true))
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185 .expect(
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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186 UseLargePages(true),
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diff changeset
187 UseTransparentHugePages(false),
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diff changeset
188 UseHugeTLBFS(false),
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189 UseSHM(true)) ;
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190
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191 // Setting a specific large pages flag will turn
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192 // off heuristics to choose large pages type.
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193 new FlagTester()
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194 .use(UseLargePages(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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195 UseSHM(false))
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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196 .expect(
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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197 UseLargePages(false),
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diff changeset
198 UseTransparentHugePages(false),
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199 UseHugeTLBFS(false),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
200 UseSHM(false));
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201
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202 // Setting UseLargePages can allow the system to choose
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203 // UseHugeTLBFS instead of UseSHM, but never UseTransparentHugePages.
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204 new FlagTester()
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205 .use(UseLargePages(true))
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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206 .expect(
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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207 UseLargePages(true),
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208 UseTransparentHugePages(false));
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209 }
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210
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211 public static void testCombinations() throws Exception {
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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212 if (!canUse(UseSHM(true)) || !canUse(UseHugeTLBFS(true))) {
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213 System.out.println("Skipping testUseHugeTLBFSAndUseSHMCombination");
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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214 return;
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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215 }
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216
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217 // UseHugeTLBFS takes precedence over SHM.
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218
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219 new FlagTester()
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
220 .use(UseLargePages(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
221 UseHugeTLBFS(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
222 UseSHM(true))
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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223 .expect(
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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224 UseLargePages(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
225 UseTransparentHugePages(false),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
226 UseHugeTLBFS(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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227 UseSHM(false));
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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228
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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229 new FlagTester()
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
230 .use(UseLargePages(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
231 UseHugeTLBFS(false),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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232 UseSHM(true))
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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233 .expect(
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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234 UseLargePages(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
235 UseTransparentHugePages(false),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
236 UseHugeTLBFS(false),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
237 UseSHM(true));
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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238
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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239 new FlagTester()
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
240 .use(UseLargePages(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
241 UseHugeTLBFS(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
242 UseSHM(false))
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
243 .expect(
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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244 UseLargePages(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
245 UseTransparentHugePages(false),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
246 UseHugeTLBFS(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
247 UseSHM(false));
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
248
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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249 new FlagTester()
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
250 .use(UseLargePages(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
251 UseHugeTLBFS(false),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
252 UseSHM(false))
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
253 .expect(
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
254 UseLargePages(false),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
255 UseTransparentHugePages(false),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
256 UseHugeTLBFS(false),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
257 UseSHM(false));
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
258
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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259
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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260 if (!canUse(UseTransparentHugePages(true))) {
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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261 return;
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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262 }
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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263
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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264 // UseTransparentHugePages takes precedence.
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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265
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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266 new FlagTester()
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
267 .use(UseLargePages(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
268 UseTransparentHugePages(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
269 UseHugeTLBFS(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
270 UseSHM(true))
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
271 .expect(
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
272 UseLargePages(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
273 UseTransparentHugePages(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
274 UseHugeTLBFS(false),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
275 UseSHM(false));
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
276
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
277 new FlagTester()
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
278 .use(UseTransparentHugePages(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
279 UseHugeTLBFS(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
280 UseSHM(true))
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
281 .expect(
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
282 UseLargePages(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
283 UseTransparentHugePages(true),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
284 UseHugeTLBFS(false),
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
285 UseSHM(false));
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
286 }
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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287
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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288 private static class FlagTester {
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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289 private Flag [] useFlags;
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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290
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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291 public FlagTester use(Flag... useFlags) {
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
292 this.useFlags = useFlags;
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
293 return this;
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
294 }
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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295
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
296 public void expect(Flag... expectedFlags) throws Exception {
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
297 if (useFlags == null) {
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
298 throw new IllegalStateException("Must run use() before expect()");
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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299 }
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
300
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
301 OutputAnalyzer output = executeNewJVM(useFlags);
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
302
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
303 for (Flag flag : expectedFlags) {
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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304 System.out.println("Looking for: " + flag.flagString());
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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305 String strValue = output.firstMatch(".* " + flag.name() + " .* :?= (\\S+).*", 1);
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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306
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
307 if (strValue == null) {
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
308 throw new RuntimeException("Flag " + flag.name() + " couldn't be found");
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
309 }
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
310
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
311 if (!flag.value().equals(strValue)) {
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
312 throw new RuntimeException("Wrong value for: " + flag.name()
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
313 + " expected: " + flag.value()
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
314 + " got: " + strValue);
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
315 }
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
316 }
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
317
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
318 output.shouldHaveExitValue(0);
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
319 }
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
320 }
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
321
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
322 private static OutputAnalyzer executeNewJVM(Flag... flags) throws Exception {
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
323 ArrayList<String> args = new ArrayList<>();
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
324 for (Flag flag : flags) {
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
325 args.add(flag.flagString());
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
326 }
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
327 args.add("-XX:+PrintFlagsFinal");
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
328 args.add("-version");
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
329
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
330 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(args.toArray(new String[args.size()]));
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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331 OutputAnalyzer output = new OutputAnalyzer(pb.start());
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
332
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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parents:
diff changeset
333 return output;
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
334 }
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
335
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
336 private static boolean canUse(Flag flag) {
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
337 try {
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
338 new FlagTester().use(flag).expect(flag);
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
339 } catch (Exception e) {
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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parents:
diff changeset
340 return false;
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
341 }
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
342
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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parents:
diff changeset
343 return true;
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
344 }
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
345
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
346 private static Flag UseLargePages(boolean value) {
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
347 return new BooleanFlag("UseLargePages", value);
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
348 }
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
349
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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diff changeset
350 private static Flag UseTransparentHugePages(boolean value) {
263f2c796d6c 8024838: Significant slowdown due to transparent huge pages
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351 return new BooleanFlag("UseTransparentHugePages", value);
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352 }
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353
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354 private static Flag UseHugeTLBFS(boolean value) {
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355 return new BooleanFlag("UseHugeTLBFS", value);
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356 }
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357
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358 private static Flag UseSHM(boolean value) {
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359 return new BooleanFlag("UseSHM", value);
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360 }
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361
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362 private static class BooleanFlag implements Flag {
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363 private String name;
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364 private boolean value;
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365
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366 BooleanFlag(String name, boolean value) {
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367 this.name = name;
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368 this.value = value;
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369 }
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370
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371 public String flagString() {
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372 return "-XX:" + (value ? "+" : "-") + name;
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373 }
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374
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375 public String name() {
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376 return name;
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377 }
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378
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379 public String value() {
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380 return Boolean.toString(value);
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381 }
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382 }
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383
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384 private static interface Flag {
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385 public String flagString();
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386 public String name();
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387 public String value();
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388 }
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389 }