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1 package jdk.jfr.internal.dcmd; |
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2 import java.time.Duration; |
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3 import java.time.Instant; |
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4 import java.time.LocalDateTime; |
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5 import java.time.ZoneOffset; |
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6 import java.time.format.DateTimeFormatter; |
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7 import java.util.ArrayList; |
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8 import java.util.Collections; |
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9 import java.util.HashMap; |
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10 import java.util.Iterator; |
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11 import java.util.List; |
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12 import java.util.Map; |
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13 import java.util.Objects; |
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14 import java.util.StringJoiner; |
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15 |
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16 import jdk.jfr.consumer.RecordedEvent; |
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17 import jdk.jfr.consumer.RecordedFrame; |
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18 import jdk.jfr.consumer.RecordedMethod; |
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19 import jdk.jfr.consumer.RecordedStackTrace; |
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20 import jdk.jfr.consumer.RecordingStream; |
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21 |
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22 /** |
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23 * |
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24 * HEALTH REPORT |
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25 * |
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26 * Example agent that shows how event streaming can be used to gather statistics |
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27 * of a running application. |
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28 * |
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29 * Usage: |
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30 * |
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31 * $ java -javaagent:health-report.jar[=interval=<interval>] MyApp |
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32 * |
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33 * where interval is how often statistics should be written to standard out. |
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34 * |
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35 * Example, |
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36 * |
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37 * $ java -javaagent:health-report.jar MyApp |
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38 * |
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39 * For testing purposes it is also possible to just run Main.java and it will |
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40 * run an allocation loop |
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41 * |
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42 * $ java Main.java |
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43 * |
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44 */ |
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45 public final class Health { |
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46 |
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47 private static final String TEMPLATE = |
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48 "=================== HEALTH REPORT === $FLUSH_TIME ====================\n" + |
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49 "| GC: $GC_NAME Phys. memory: $PHYSIC_MEM Alloc Rate: $ALLOC_RATE |\n" + |
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50 "| OC Count : $OC_COUNT Initial Heap: $INIT_HEAP Total Alloc: $TOT_ALLOC |\n" + |
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51 "| OC Pause Avg: $OC_AVG Used Heap : $USED_HEAP Thread Count: $THREADS |\n" + |
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52 "| OC Pause Max: $OC_MAX Commit. Heap: $COM_HEAP Class Count : $CLASSES |\n" + |
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53 "| YC Count : $YC_COUNT CPU Machine : $MACH_CPU Safepoints: $SAFEPOINTS |\n" + |
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54 "| YC Pause Avg: $YC_AVG CPU JVM User : $USR_CPU Max Safepoint: $MAX_SAFE |\n" + |
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55 "| YC Pause Max: $YC_MAX CPU JVM System: $SYS_CPU Max Comp. Time: $MAX_COM |\n" + |
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56 "|--- Top Allocation Methods ------------------------------- -----------------|\n" + |
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57 "| $ALLOCACTION_TOP_FRAME $AL_PE |\n" + |
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58 "| $ALLOCACTION_TOP_FRAME $AL_PE |\n" + |
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59 "| $ALLOCACTION_TOP_FRAME $AL_PE |\n" + |
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60 "| $ALLOCACTION_TOP_FRAME $AL_PE |\n" + |
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61 "| $ALLOCACTION_TOP_FRAME $AL_PE |\n" + |
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62 "|--- Hot Methods ------------------------------------------------------------|\n" + |
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63 "| $EXECUTION_TOP_FRAME $EX_PE |\n" + |
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64 "| $EXECUTION_TOP_FRAME $EX_PE |\n" + |
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65 "| $EXECUTION_TOP_FRAME $EX_PE |\n" + |
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66 "| $EXECUTION_TOP_FRAME $EX_PE |\n" + |
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67 "| $EXECUTION_TOP_FRAME $EX_PE |\n" + |
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68 "==============================================================================\n"; |
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69 |
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70 public final static Field FLUSH_TIME = new Field(); |
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71 |
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72 public final static Field GC_NAME = new Field(); |
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73 public final static Field OC_COUNT= new Field(Option.COUNT); |
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74 public final static Field OC_AVG = new Field(Option.AVERAGE, Option.DURATION); |
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75 public final static Field OC_MAX = new Field(Option.MAX, Option.DURATION); |
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76 public final static Field YC_COUNT = new Field(Option.COUNT); |
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77 public final static Field YC_AVG = new Field(Option.AVERAGE, Option.DURATION); |
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78 public final static Field YC_MAX= new Field(Option.MAX, Option.DURATION); |
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79 |
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80 public final static Field PHYSIC_MEM = new Field(Option.BYTES); |
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81 public final static Field INIT_HEAP = new Field(Option.BYTES); |
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82 public final static Field USED_HEAP = new Field(Option.BYTES); |
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83 public final static Field COM_HEAP = new Field(Option.BYTES); |
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84 public final static Field MACH_CPU = new Field(Option.PERCENTAGE); |
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85 public final static Field USR_CPU= new Field(Option.PERCENTAGE); |
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86 public final static Field SYS_CPU = new Field(Option.PERCENTAGE); |
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87 |
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88 public final static Field ALLOC_RATE = new Field(Option.BYTES_PER_SECOND); |
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89 public final static Field TOT_ALLOC = new Field(Option.TOTAL, Option.BYTES); |
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90 public final static Field THREADS = new Field(); |
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91 public final static Field CLASSES = new Field(); |
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92 public final static Field SAFEPOINTS = new Field(Option.COUNT); |
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93 public final static Field MAX_SAFE = new Field(Option.MAX, Option.DURATION); |
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94 public final static Field MAX_COM = new Field(Option.MAX, Option.DURATION); |
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95 |
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96 public final static Field ALLOCACTION_TOP_FRAME = new Field(); |
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97 public final static Field AL_PE = new Field(Option.NORMALIZED, Option.TOTAL); |
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98 |
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99 public final static Field EXECUTION_TOP_FRAME = new Field(); |
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100 public final static Field EX_PE = new Field(Option.NORMALIZED, Option.COUNT); |
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101 |
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102 private static RecordingStream rs; |
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103 |
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104 public static void start() { |
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105 Duration duration = Duration.ofSeconds(1); |
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106 |
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107 rs = new RecordingStream(); |
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108 // Event configuration |
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109 rs.enable("jdk.CPULoad").withPeriod(duration); |
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110 rs.enable("jdk.YoungGarbageCollection").withoutThreshold(); |
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111 rs.enable("jdk.OldGarbageCollection").withoutThreshold(); |
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112 rs.enable("jdk.GCHeapSummary").withPeriod(duration); |
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113 rs.enable("jdk.PhysicalMemory").withPeriod(duration); |
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114 rs.enable("jdk.GCConfiguration").withPeriod(duration); |
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115 rs.enable("jdk.SafepointBegin"); |
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116 rs.enable("jdk.SafepointEnd"); |
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117 rs.enable("jdk.ObjectAllocationOutsideTLAB").withStackTrace(); |
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118 rs.enable("jdk.ObjectAllocationInNewTLAB").withStackTrace(); |
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119 rs.enable("jdk.ExecutionSample").withPeriod(Duration.ofMillis(10)).withStackTrace(); |
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120 rs.enable("jdk.JavaThreadStatistics").withPeriod(duration); |
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121 rs.enable("jdk.ClassLoadingStatistics").withPeriod(duration); |
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122 rs.enable("jdk.Compilation").withoutThreshold(); |
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123 rs.enable("jdk.GCHeapConfiguration").withPeriod(duration); |
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124 rs.enable("jdk.Flush").withoutThreshold(); |
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125 |
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126 // Dispatch handlers |
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127 rs.onEvent("jdk.CPULoad", Health::onCPULoad); |
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128 rs.onEvent("jdk.YoungGarbageCollection", Health::onYoungColletion); |
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129 rs.onEvent("jdk.OldGarbageCollection", Health::onOldCollection); |
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130 rs.onEvent("jdk.GCHeapSummary", Health::onGCHeapSummary); |
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131 rs.onEvent("jdk.PhysicalMemory", Health::onPhysicalMemory); |
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132 rs.onEvent("jdk.GCConfiguration", Health::onGCConfiguration); |
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133 rs.onEvent("jdk.SafepointBegin", Health::onSafepointBegin); |
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134 rs.onEvent("jdk.SafepointEnd", Health::onSafepointEnd); |
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135 rs.onEvent("jdk.ObjectAllocationOutsideTLAB", Health::onObjectAllocationOutsideTLAB); |
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136 rs.onEvent("jdk.ObjectAllocationInNewTLAB", Health::onObjectAllocationInNewTLAB); |
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137 rs.onEvent("jdk.ExecutionSample", Health::onExecutionSample); |
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138 rs.onEvent("jdk.JavaThreadStatistics", Health::onJavaThreadStatistics); |
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139 rs.onEvent("jdk.ClassLoadingStatistics", Health::onClassLoadingStatistics); |
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140 rs.onEvent("jdk.Compilation", Health::onCompilation); |
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141 rs.onEvent("jdk.GCHeapConfiguration", Health::onGCHeapConfiguration); |
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142 rs.onEvent("jdk.Flush", Health::onFlushpoint); |
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143 |
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144 rs.onFlush(Health::printReport); |
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145 rs.startAsync(); |
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146 System.out.println("Health started"); |
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147 } |
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148 |
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149 private static void onCPULoad(RecordedEvent event) { |
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150 MACH_CPU.addSample(event.getDouble("machineTotal")); |
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151 SYS_CPU.addSample(event.getDouble("jvmSystem")); |
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152 USR_CPU.addSample(event.getDouble("jvmUser")); |
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153 } |
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154 |
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155 private static void onYoungColletion(RecordedEvent event) { |
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156 long nanos = event.getDuration().toNanos(); |
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157 YC_COUNT.addSample(nanos); |
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158 YC_MAX.addSample(nanos); |
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159 YC_AVG.addSample(nanos); |
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160 } |
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161 |
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162 private static void onOldCollection(RecordedEvent event) { |
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163 long nanos = event.getDuration().toNanos(); |
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164 OC_COUNT.addSample(nanos); |
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165 OC_MAX.addSample(nanos); |
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166 OC_AVG.addSample(nanos); |
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167 } |
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168 |
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169 private static void onGCHeapSummary(RecordedEvent event) { |
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170 USED_HEAP.addSample(event.getLong("heapUsed")); |
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171 COM_HEAP.addSample(event.getLong("heapSpace.committedSize")); |
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172 } |
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173 |
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174 private static void onPhysicalMemory(RecordedEvent event) { |
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175 PHYSIC_MEM.addSample(event.getLong("totalSize")); |
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176 } |
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177 |
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178 private static void onCompilation(RecordedEvent event) { |
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179 MAX_COM.addSample(event.getDuration().toNanos()); |
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180 } |
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181 |
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182 private static void onGCConfiguration(RecordedEvent event) { |
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183 String gc = event.getString("oldCollector"); |
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184 String yc = event.getString("youngCollector"); |
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185 if (yc != null) { |
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186 gc += "/" + yc; |
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187 } |
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188 GC_NAME.addSample(gc); |
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189 } |
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190 |
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191 private final static Map<Long, Instant> safepointBegin = new HashMap<>(); |
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192 |
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193 private static void onSafepointBegin(RecordedEvent event) { |
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194 safepointBegin.put(event.getValue("safepointId"), event.getEndTime()); |
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195 } |
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196 |
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197 private static void onSafepointEnd(RecordedEvent event) { |
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198 long id = event.getValue("safepointId"); |
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199 Instant begin = safepointBegin.get(id); |
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200 if (begin != null) { |
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201 long nanos = Duration.between(begin, event.getEndTime()).toNanos(); |
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202 safepointBegin.remove(id); |
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203 SAFEPOINTS.addSample(nanos); |
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204 MAX_SAFE.addSample(nanos); |
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205 } |
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206 } |
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207 |
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208 private static void onObjectAllocationOutsideTLAB(RecordedEvent event) { |
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209 onAllocationSample(event, event.getLong("allocationSize")); |
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210 } |
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211 |
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212 private static void onObjectAllocationInNewTLAB(RecordedEvent event) { |
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213 onAllocationSample(event, event.getLong("tlabSize")); |
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214 } |
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215 |
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216 private static double totalAllocated; |
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217 private static long firstAllocationTime = -1; |
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218 private static void onAllocationSample(RecordedEvent event, long size) { |
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219 String topFrame = topFrame(event.getStackTrace()); |
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220 if (topFrame != null) { |
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221 ALLOCACTION_TOP_FRAME.addSample(topFrame, size); |
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222 AL_PE.addSample(topFrame, size); |
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223 } |
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224 TOT_ALLOC.addSample(size); |
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225 // ALLOC_RATE.addRate(timetsamp, amount); |
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226 long timestamp = event.getEndTime().toEpochMilli(); |
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227 totalAllocated += size; |
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228 if (firstAllocationTime > 0) { |
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229 long elapsedTime = timestamp - firstAllocationTime; |
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230 if (elapsedTime > 0) { |
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231 double rate = 1000.0 * (totalAllocated / elapsedTime); |
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232 ALLOC_RATE.addSample(rate); |
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233 } |
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234 } else { |
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235 firstAllocationTime = timestamp; |
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236 } |
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237 } |
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238 |
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239 private static void onExecutionSample(RecordedEvent event) { |
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240 String topFrame = topFrame(event.getStackTrace()); |
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241 EXECUTION_TOP_FRAME.addSample(topFrame, 1); |
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242 EX_PE.addSample(topFrame, 1); |
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243 } |
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244 |
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245 private static void onJavaThreadStatistics(RecordedEvent event) { |
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246 THREADS.addSample(event.getDouble("activeCount")); |
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247 } |
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248 |
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249 private static void onClassLoadingStatistics(RecordedEvent event) { |
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250 long diff = event.getLong("loadedClassCount") - event.getLong("unloadedClassCount"); |
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251 CLASSES.addSample(diff); |
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252 } |
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253 |
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254 private static void onGCHeapConfiguration(RecordedEvent event) { |
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255 INIT_HEAP.addSample(event.getLong("initialSize")); |
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256 } |
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257 |
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258 private final static DateTimeFormatter FORMATTER = |
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259 DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"); |
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260 private static void onFlushpoint(RecordedEvent event) { |
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261 Instant i = event.getEndTime(); |
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262 LocalDateTime l = LocalDateTime.ofInstant(i, ZoneOffset.systemDefault()); |
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263 FLUSH_TIME.addSample(FORMATTER.format(l)); |
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264 } |
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265 |
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266 // # # # TEMPLATE AND SAMPLING # # # |
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267 |
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268 private enum Option { |
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269 BYTES, PERCENTAGE, DURATION, BYTES_PER_SECOND, NORMALIZED, COUNT, AVERAGE, TOTAL, MAX |
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270 } |
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271 |
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272 private static final class Record { |
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273 private final Object key; |
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274 private int count = 1; |
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275 private double total; |
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276 private double max; |
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277 private Object value = null; |
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278 public Record(Object key, String sample) { |
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279 this.key = key; |
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280 this.value = sample; |
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281 } |
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282 |
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283 public Record(Object object, double sample) { |
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284 this.key = object; |
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285 this.value = sample; |
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286 this.max = sample; |
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287 this.total = sample; |
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288 } |
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289 |
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290 public long getCount() { |
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291 return count; |
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292 } |
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293 |
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294 public double getAverage() { |
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295 return total / count; |
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296 } |
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297 |
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298 public double getMax() { |
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299 return max; |
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300 } |
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301 |
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302 public double getTotal() { |
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303 return total; |
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304 } |
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305 |
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306 public int hashCode() { |
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307 return key == null ? 0 : key.hashCode(); |
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308 } |
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309 |
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310 public boolean equals(Object o) { |
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311 if (o instanceof Record) { |
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312 Record that = (Record) o; |
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313 return Objects.equals(that.key, this.key); |
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314 } |
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315 return false; |
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316 } |
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317 } |
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318 |
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319 private static final class Field implements Iterable<Record> { |
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320 private final HashMap<Object, Record> histogram = new HashMap<>(); |
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321 private final Option[] options; |
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322 private double norm; |
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323 |
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324 public Field(Option... options) { |
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325 this.options = options; |
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326 } |
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327 |
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328 public void addSample(double sample) { |
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329 addSample(this, sample); |
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330 } |
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331 |
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332 public void addSample(String sample) { |
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333 histogram.merge(this, new Record(this, sample), (a, b) -> { |
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334 a.count++; |
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335 a.value = sample; |
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336 return a; |
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337 }); |
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338 } |
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339 |
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340 public void addSample(Object key, double sample) { |
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341 histogram.merge(key, new Record(key, sample), (a, b) -> { |
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342 a.count++; |
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343 a.total += sample; |
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344 a.value = sample; |
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345 a.max = Math.max(a.max, sample); |
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346 return a; |
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347 }); |
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348 } |
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349 |
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350 public boolean hasOption(Option option) { |
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351 for (Option o : options) { |
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352 if (o == option) { |
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353 return true; |
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354 } |
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355 } |
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356 return false; |
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357 } |
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358 |
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359 @Override |
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360 public Iterator<Record> iterator() { |
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361 List<Record> records = new ArrayList<>(histogram.values()); |
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362 Collections.sort(records, (a, b) -> Long.compare(b.getCount(), a.getCount())); |
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363 if (hasOption(Option.TOTAL)) { |
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364 Collections.sort(records, (a, b) -> Double.compare(b.getTotal(), a.getTotal())); |
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365 } |
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366 if (hasOption(Option.NORMALIZED)) { |
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367 norm = 0.0; |
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368 for (Record r : records) { |
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369 if (hasOption(Option.TOTAL)) { |
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370 norm += r.getTotal(); |
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371 } |
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372 if (hasOption(Option.COUNT)) { |
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373 norm += r.getCount(); |
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374 } |
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375 } |
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376 } |
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377 return records.iterator(); |
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378 } |
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379 |
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380 public double getNorm() { |
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381 return norm; |
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382 } |
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383 } |
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384 |
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385 private static void printReport() { |
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386 try { |
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387 StringBuilder template = new StringBuilder(TEMPLATE); |
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388 for (java.lang.reflect.Field f : Health.class.getDeclaredFields()) { |
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389 String variable = "$" + f.getName(); |
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390 if (f.getType() == Field.class) { |
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391 writeParam(template, variable, (Field) f.get(null)); |
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392 } |
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393 } |
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394 System.out.println(template.toString()); |
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395 } catch (Exception e) { |
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396 e.printStackTrace(); |
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397 } |
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398 } |
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399 |
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400 private static void writeParam(StringBuilder template, String variable, Field param) { |
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401 Iterator<Record> it = param.iterator(); |
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402 int lastIndex = 0; |
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403 while (true) { |
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404 int index = template.indexOf(variable, lastIndex); |
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405 if (index == -1) { |
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406 return; |
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407 } |
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408 lastIndex = index + 1; |
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409 Record record = it.hasNext() ? it.next() : null; |
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410 Object value = null; |
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411 if (record != null) { |
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412 value = (record.key == param) ? record.value : record.key; |
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413 } |
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414 if (value != null) { |
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415 if (param.hasOption(Option.MAX)) { |
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416 value = record.getMax(); |
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417 } |
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418 if (param.hasOption(Option.COUNT)) { |
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419 value = record.getCount(); |
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420 } |
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421 if (param.hasOption(Option.AVERAGE)) { |
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422 value = record.getAverage(); |
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423 } |
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424 if (param.hasOption(Option.TOTAL)) { |
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425 value = record.getTotal(); |
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426 } |
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427 } |
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428 if (param.hasOption(Option.COUNT)) { |
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429 value = value == null ? 0 : value; |
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430 } |
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431 if (param.hasOption(Option.BYTES)) { |
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432 value = formatBytes((Number) value); |
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433 } |
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434 if (param.hasOption(Option.DURATION)) { |
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435 value = formatDuration((Number) value); |
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436 } |
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437 if (param.hasOption(Option.BYTES_PER_SECOND)) { |
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438 if (value != null) { |
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439 value = formatBytes((Number) value) + "/s"; |
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440 } |
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441 } |
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442 if (param.hasOption(Option.NORMALIZED)) { |
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443 if (value != null) { |
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444 double d = ((Number) value).doubleValue() / param.getNorm(); |
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445 value = formatPercentage(d); |
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446 } |
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447 } |
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448 if (param.hasOption(Option.PERCENTAGE)) { |
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449 value = formatPercentage((Number) value); |
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450 } |
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451 String text; |
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452 if (value == null) { |
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453 text = record == null ? "" : "N/A"; |
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454 } else { |
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455 text = String.valueOf(value); |
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456 } |
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457 int length = Math.max(text.length(), variable.length()); |
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458 for (int i = 0; i < length; i++) { |
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459 char c = i < text.length() ? text.charAt(i) : ' '; |
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460 template.setCharAt(index + i, c); |
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461 } |
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462 } |
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463 } |
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464 |
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465 // # # # FORMATTING # # # |
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466 |
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467 enum TimespanUnit { |
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468 NANOSECONDS("ns", 1000), MICROSECONDS("us", 1000), MILLISECONDS("ms", 1000), SECONDS("s", 60), MINUTES("m", 60), |
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469 HOURS("h", 24), DAYS("d", 7); |
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470 |
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471 final String text; |
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472 final long amount; |
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473 |
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474 TimespanUnit(String unit, long amount) { |
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475 this.text = unit; |
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476 this.amount = amount; |
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477 } |
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478 } |
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479 |
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480 private static String formatDuration(Number value) { |
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481 if (value == null) { |
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482 return "N/A"; |
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483 } |
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484 double t = value.doubleValue(); |
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485 TimespanUnit result = TimespanUnit.NANOSECONDS; |
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486 for (TimespanUnit unit : TimespanUnit.values()) { |
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487 result = unit; |
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488 if (t < 1000) { |
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489 break; |
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490 } |
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491 t = t / unit.amount; |
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492 } |
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493 return String.format("%.1f %s", t, result.text); |
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494 } |
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495 |
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496 private static String formatPercentage(Number value) { |
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497 if (value == null) { |
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498 return "N/A"; |
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499 } |
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500 return String.format("%6.2f %%", value.doubleValue() * 100); |
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501 } |
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502 |
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503 private static String formatBytes(Number value) { |
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504 if (value == null) { |
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505 return "N/A"; |
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506 } |
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507 long bytes = value.longValue(); |
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508 if (bytes >= 1024 * 1024l) { |
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509 return bytes / (1024 * 1024L) + " MB"; |
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510 } |
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511 if (bytes >= 1024) { |
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512 return bytes / 1024 + " kB"; |
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513 } |
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514 return bytes + " bytes"; |
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515 } |
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516 |
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517 private static String topFrame(RecordedStackTrace stackTrace) { |
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518 if (stackTrace == null) { |
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519 return null; |
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520 } |
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521 List<RecordedFrame> frames = stackTrace.getFrames(); |
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522 if (!frames.isEmpty()) { |
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523 RecordedFrame topFrame = frames.get(0); |
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524 if (topFrame.isJavaFrame()) { |
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525 return formatMethod(topFrame.getMethod()); |
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526 } |
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527 } |
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528 return null; |
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529 } |
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530 |
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531 private static String formatMethod(RecordedMethod m) { |
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532 StringBuilder sb = new StringBuilder(); |
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533 String typeName = m.getType().getName(); |
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534 typeName = typeName.substring(typeName.lastIndexOf('.') + 1); |
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535 sb.append(typeName).append(".").append(m.getName()); |
|
536 sb.append("("); |
|
537 StringJoiner sj = new StringJoiner(", "); |
|
538 String md = m.getDescriptor().replace("/", "."); |
|
539 String parameter = md.substring(1, md.lastIndexOf(")")); |
|
540 for (String qualifiedName : decodeDescriptors(parameter)) { |
|
541 sj.add(qualifiedName.substring(qualifiedName.lastIndexOf('.') + 1)); |
|
542 } |
|
543 sb.append(sj.length() > 10 ? "..." : sj); |
|
544 sb.append(")"); |
|
545 return sb.toString(); |
|
546 } |
|
547 |
|
548 private static List<String> decodeDescriptors(String descriptor) { |
|
549 List<String> descriptors = new ArrayList<>(); |
|
550 for (int index = 0; index < descriptor.length(); index++) { |
|
551 String arrayBrackets = ""; |
|
552 while (descriptor.charAt(index) == '[') { |
|
553 arrayBrackets += "[]"; |
|
554 index++; |
|
555 } |
|
556 char c = descriptor.charAt(index); |
|
557 String type; |
|
558 switch (c) { |
|
559 case 'L': |
|
560 int endIndex = descriptor.indexOf(';', index); |
|
561 type = descriptor.substring(index + 1, endIndex); |
|
562 index = endIndex; |
|
563 break; |
|
564 case 'I': |
|
565 type = "int"; |
|
566 break; |
|
567 case 'J': |
|
568 type = "long"; |
|
569 break; |
|
570 case 'Z': |
|
571 type = "boolean"; |
|
572 break; |
|
573 case 'D': |
|
574 type = "double"; |
|
575 break; |
|
576 case 'F': |
|
577 type = "float"; |
|
578 break; |
|
579 case 'S': |
|
580 type = "short"; |
|
581 break; |
|
582 case 'C': |
|
583 type = "char"; |
|
584 break; |
|
585 case 'B': |
|
586 type = "byte"; |
|
587 break; |
|
588 default: |
|
589 type = "<unknown-descriptor-type>"; |
|
590 } |
|
591 descriptors.add(type + arrayBrackets); |
|
592 } |
|
593 return descriptors; |
|
594 } |
|
595 } |
|
596 |