Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/FJTaskRunnerGroup.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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1 /* |
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2 File: FJTaskRunnerGroup.java |
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3 |
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4 Originally written by Doug Lea and released into the public domain. |
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5 This may be used for any purposes whatsoever without acknowledgment. |
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6 Thanks for the assistance and support of Sun Microsystems Labs, |
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7 and everyone contributing, testing, and using this code. |
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8 |
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9 History: |
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10 Date Who What |
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11 7Jan1999 dl First public release |
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12 12Jan1999 dl made getActiveCount public; misc minor cleanup. |
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13 14Jan1999 dl Added executeTask |
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14 20Jan1999 dl Allow use of priorities; reformat stats |
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15 6Feb1999 dl Lazy thread starts |
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16 27Apr1999 dl Renamed |
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17 */ |
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18 |
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19 package EDU.oswego.cs.dl.util.concurrent; |
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20 |
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21 /** |
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22 * A stripped down analog of a ThreadGroup used for |
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23 * establishing and managing FJTaskRunner threads. |
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24 * ThreadRunnerGroups serve as the control boundary separating |
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25 * the general world of normal threads from the specialized world |
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26 * of FJTasks. |
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27 * <p> |
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28 * By intent, this class does not subclass java.lang.ThreadGroup, and |
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29 * does not support most methods found in ThreadGroups, since they |
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30 * would make no sense for FJTaskRunner threads. In fact, the class |
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31 * does not deal with ThreadGroups at all. If you want to restrict |
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32 * a FJTaskRunnerGroup to a particular ThreadGroup, you can create |
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33 * it from within that ThreadGroup. |
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34 * <p> |
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35 * The main contextual parameter for a FJTaskRunnerGroup is |
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36 * the group size, established in the constructor. |
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37 * Groups must be of a fixed size. |
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38 * There is no way to dynamically increase or decrease the number |
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39 * of threads in an existing group. |
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40 * <p> |
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41 * In general, the group size should be equal to the number |
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42 * of CPUs on the system. (Unfortunately, there is no portable |
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43 * means of automatically detecting the number of CPUs on a JVM, so there is |
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44 * no good way to automate defaults.) In principle, when |
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45 * FJTasks are used for computation-intensive tasks, having only |
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46 * as many threads as CPUs should minimize bookkeeping overhead |
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47 * and contention, and so maximize throughput. However, because |
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48 * FJTaskRunners lie atop Java threads, and in turn operating system |
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49 * thread support and scheduling policies, |
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50 * it is very possible that using more threads |
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51 * than CPUs will improve overall throughput even though it adds |
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52 * to overhead. This will always be so if FJTasks are I/O bound. |
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53 * So it may pay to experiment a bit when tuning on particular platforms. |
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54 * You can also use <code>setRunPriorities</code> to either |
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55 * increase or decrease the priorities of active threads, which |
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56 * may interact with group size choice. |
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57 * <p> |
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58 * In any case, overestimating group sizes never |
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59 * seriously degrades performance (at least within reasonable bounds). |
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60 * You can also use a value |
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61 * less than the number of CPUs in order to reserve processing |
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62 * for unrelated threads. |
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63 * <p> |
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64 * There are two general styles for using a FJTaskRunnerGroup. |
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65 * You can create one group per entire program execution, for example |
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66 * as a static singleton, and use it for all parallel tasks: |
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67 * <pre> |
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68 * class Tasks { |
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69 * static FJTaskRunnerGroup group; |
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70 * public void initialize(int groupsize) { |
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71 * group = new FJTaskRunnerGroup(groupSize); |
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72 * } |
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73 * // ... |
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74 * } |
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75 * </pre> |
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76 * Alternatively, you can make new groups on the fly and use them only for |
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77 * particular task sets. This is more flexible,, |
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78 * and leads to more controllable and deterministic execution patterns, |
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79 * but it encounters greater overhead on startup. Also, to reclaim |
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80 * system resources, you should |
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81 * call <code>FJTaskRunnerGroup.interruptAll</code> when you are done |
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82 * using one-shot groups. Otherwise, because FJTaskRunners set |
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83 * <code>Thread.isDaemon</code> |
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84 * status, they will not normally be reclaimed until program termination. |
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85 * <p> |
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86 * The main supported methods are <code>execute</code>, |
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87 * which starts a task processed by FJTaskRunner threads, |
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88 * and <code>invoke</code>, which starts one and waits for completion. |
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89 * For example, you might extend the above <code>FJTasks</code> |
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90 * class to support a task-based computation, say, the |
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91 * <code>Fib</code> class from the <code>FJTask</code> documentation: |
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92 * <pre> |
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93 * class Tasks { // continued |
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94 * // ... |
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95 * static int fib(int n) { |
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96 * try { |
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97 * Fib f = new Fib(n); |
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98 * group.invoke(f); |
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99 * return f.getAnswer(); |
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100 * } |
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101 * catch (InterruptedException ex) { |
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102 * throw new Error("Interrupted during computation"); |
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103 * } |
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104 * } |
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105 * } |
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106 * </pre> |
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107 * <p> |
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108 * Method <code>stats()</code> can be used to monitor performance. |
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109 * Both FJTaskRunnerGroup and FJTaskRunner may be compiled with |
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110 * the compile-time constant COLLECT_STATS set to false. In this |
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111 * case, various simple counts reported in stats() are not collected. |
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112 * On platforms tested, |
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113 * this leads to such a tiny performance improvement that there is |
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114 * very little motivation to bother. |
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115 * |
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116 * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>] |
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117 * <p> |
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118 * @see FJTask |
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119 * @see FJTaskRunner |
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120 **/ |
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121 |
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122 public class FJTaskRunnerGroup implements Executor { |
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123 |
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124 /** The threads in this group **/ |
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125 protected final FJTaskRunner[] threads; |
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126 |
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127 /** Group-wide queue for tasks entered via execute() **/ |
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128 protected final LinkedQueue entryQueue = new LinkedQueue(); |
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129 |
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130 /** Number of threads that are not waiting for work **/ |
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131 protected int activeCount = 0; |
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132 |
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133 /** Number of threads that have been started. Used to avoid |
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134 unecessary contention during startup of task sets. |
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135 **/ |
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136 protected int nstarted = 0; |
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137 |
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138 /** |
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139 * Compile-time constant. If true, various counts of |
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140 * runs, waits, etc., are maintained. These are NOT |
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141 * updated with synchronization, so statistics reports |
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142 * might not be accurate. |
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143 **/ |
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144 |
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145 static final boolean COLLECT_STATS = true; |
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146 // static final boolean COLLECT_STATS = false; |
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147 |
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148 // for stats |
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149 |
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150 /** The time at which this ThreadRunnerGroup was constructed **/ |
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151 long initTime = 0; |
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152 |
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153 /** Total number of executes or invokes **/ |
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154 int entries = 0; |
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155 |
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156 static final int DEFAULT_SCAN_PRIORITY = Thread.MIN_PRIORITY+1; |
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157 |
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158 /** |
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159 * Create a FJTaskRunnerGroup with the indicated number |
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160 * of FJTaskRunner threads. Normally, the best size to use is |
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161 * the number of CPUs on the system. |
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162 * <p> |
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163 * The threads in a FJTaskRunnerGroup are created with their |
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164 * isDaemon status set, so do not normally need to be |
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165 * shut down manually upon program termination. |
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166 **/ |
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167 |
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168 public FJTaskRunnerGroup(int groupSize) { |
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169 threads = new FJTaskRunner[groupSize]; |
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170 initializeThreads(); |
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171 initTime = System.currentTimeMillis(); |
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172 } |
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173 |
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174 /** |
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175 * Arrange for execution of the given task |
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176 * by placing it in a work queue. If the argument |
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177 * is not of type FJTask, it is embedded in a FJTask via |
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178 * <code>FJTask.Wrap</code>. |
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179 * @exception InterruptedException if current Thread is |
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180 * currently interrupted |
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181 **/ |
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182 |
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183 public void execute(Runnable r) throws InterruptedException { |
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184 if (r instanceof FJTask) { |
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185 entryQueue.put((FJTask)r); |
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186 } |
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187 else { |
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188 entryQueue.put(new FJTask.Wrap(r)); |
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189 } |
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190 signalNewTask(); |
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191 } |
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192 |
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193 |
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194 /** |
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195 * Specialized form of execute called only from within FJTasks |
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196 **/ |
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197 public void executeTask(FJTask t) { |
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198 try { |
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199 entryQueue.put(t); |
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200 signalNewTask(); |
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201 } |
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202 catch (InterruptedException ex) { |
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203 Thread.currentThread().interrupt(); |
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204 } |
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205 } |
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206 |
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207 |
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208 /** |
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209 * Start a task and wait it out. Returns when the task completes. |
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210 * @exception InterruptedException if current Thread is |
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211 * interrupted before completion of the task. |
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212 **/ |
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213 |
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214 public void invoke(Runnable r) throws InterruptedException { |
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215 InvokableFJTask w = new InvokableFJTask(r); |
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216 entryQueue.put(w); |
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217 signalNewTask(); |
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218 w.awaitTermination(); |
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219 } |
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220 |
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221 |
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222 /** |
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223 * Try to shut down all FJTaskRunner threads in this group |
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224 * by interrupting them all. This method is designed |
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225 * to be used during cleanup when it is somehow known |
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226 * that all threads are idle. |
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227 * FJTaskRunners only |
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228 * check for interruption when they are not otherwise |
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229 * processing a task (and its generated subtasks, |
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230 * if any), so if any threads are active, shutdown may |
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231 * take a while, and may lead to unpredictable |
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232 * task processing. |
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233 **/ |
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234 |
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235 public void interruptAll() { |
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236 // paranoically interrupt current thread last if in group. |
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237 Thread current = Thread.currentThread(); |
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238 boolean stopCurrent = false; |
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239 |
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240 for (int i = 0; i < threads.length; ++i) { |
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241 Thread t = threads[i]; |
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242 if (t == current) |
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243 stopCurrent = true; |
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244 else |
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245 t.interrupt(); |
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246 } |
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247 if (stopCurrent) |
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248 current.interrupt(); |
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249 } |
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250 |
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251 |
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252 /** |
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253 * Set the priority to use while a FJTaskRunner is |
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254 * polling for new tasks to perform. Default |
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255 * is currently Thread.MIN_PRIORITY+1. The value |
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256 * set may not go into effect immediately, but |
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257 * will be used at least the next time a thread scans for work. |
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258 **/ |
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259 public synchronized void setScanPriorities(int pri) { |
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260 for (int i = 0; i < threads.length; ++i) { |
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261 FJTaskRunner t = threads[i]; |
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262 t.setScanPriority(pri); |
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263 if (!t.active) t.setPriority(pri); |
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264 } |
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265 } |
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266 |
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267 |
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268 /** |
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269 * Set the priority to use while a FJTaskRunner is |
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270 * actively running tasks. Default |
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271 * is the priority that was in effect by the thread that |
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272 * constructed this FJTaskRunnerGroup. Setting this value |
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273 * while threads are running may momentarily result in |
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274 * them running at this priority even when idly waiting for work. |
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275 **/ |
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276 public synchronized void setRunPriorities(int pri) { |
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277 for (int i = 0; i < threads.length; ++i) { |
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278 FJTaskRunner t = threads[i]; |
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279 t.setRunPriority(pri); |
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280 if (t.active) t.setPriority(pri); |
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281 } |
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282 } |
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283 |
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284 |
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285 |
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286 /** Return the number of FJTaskRunner threads in this group **/ |
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287 |
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288 public int size() { return threads.length; } |
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289 |
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290 |
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291 /** |
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292 * Return the number of threads that are not idly waiting for work. |
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293 * Beware that even active threads might not be doing any useful |
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294 * work, but just spinning waiting for other dependent tasks. |
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295 * Also, since this is just a snapshot value, some tasks |
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296 * may be in the process of becoming idle. |
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297 **/ |
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298 public synchronized int getActiveCount() { return activeCount; } |
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299 |
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300 /** |
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301 * Prints various snapshot statistics to System.out. |
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302 * <ul> |
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303 * <li> For each FJTaskRunner thread (labeled as T<em>n</em>, for |
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304 * <em>n</em> from zero to group size - 1): |
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305 * <ul> |
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306 * <li> A star "*" is printed if the thread is currently active; |
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307 * that is, not sleeping while waiting for work. Because |
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308 * threads gradually enter sleep modes, an active thread |
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309 * may in fact be about to sleep (or wake up). |
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310 * <li> <em>Q Cap</em> The current capacity of its task queue. |
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311 * <li> <em>Run</em> The total number of tasks that have been run. |
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312 * <li> <em>New</em> The number of these tasks that were |
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313 * taken from either the entry queue or from other |
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314 * thread queues; that is, the number of tasks run |
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315 * that were <em>not</em> forked by the thread itself. |
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316 * <li> <em>Scan</em> The number of times other task |
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317 * queues or the entry queue were polled for tasks. |
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318 * </ul> |
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319 * <li> <em>Execute</em> The total number of tasks entered |
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320 * (but not necessarily yet run) via execute or invoke. |
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321 * <li> <em>Time</em> Time in seconds since construction of this |
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322 * FJTaskRunnerGroup. |
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323 * <li> <em>Rate</em> The total number of tasks processed |
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324 * per second across all threads. This |
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325 * may be useful as a simple throughput indicator |
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326 * if all processed tasks take approximately the |
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327 * same time to run. |
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328 * </ul> |
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329 * <p> |
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330 * Cautions: Some statistics are updated and gathered |
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331 * without synchronization, |
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332 * so may not be accurate. However, reported counts may be considered |
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333 * as lower bounds of actual values. |
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334 * Some values may be zero if classes are compiled |
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335 * with COLLECT_STATS set to false. (FJTaskRunner and FJTaskRunnerGroup |
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336 * classes can be independently compiled with different values of |
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337 * COLLECT_STATS.) Also, the counts are maintained as ints so could |
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338 * overflow in exceptionally long-lived applications. |
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339 * <p> |
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340 * These statistics can be useful when tuning algorithms or diagnosing |
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341 * problems. For example: |
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342 * <ul> |
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343 * <li> High numbers of scans may mean that there is insufficient |
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344 * parallelism to keep threads busy. However, high scan rates |
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345 * are expected if the number |
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346 * of Executes is also high or there is a lot of global |
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347 * synchronization in the application, and the system is not otherwise |
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348 * busy. Threads may scan |
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349 * for work hundreds of times upon startup, shutdown, and |
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350 * global synch points of task sets. |
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351 * <li> Large imbalances in tasks run across different threads might |
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352 * just reflect contention with unrelated threads on a system |
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353 * (possibly including JVM threads such as GC), but may also |
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354 * indicate some systematic bias in how you generate tasks. |
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355 * <li> Large task queue capacities may mean that too many tasks are being |
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356 * generated before they can be run. |
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357 * Capacities are reported rather than current numbers of tasks |
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358 * in queues because they are better indicators of the existence |
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359 * of these kinds of possibly-transient problems. |
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360 * Queue capacities are |
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361 * resized on demand from their initial value of 4096 elements, |
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362 * which is much more than sufficient for the kinds of |
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363 * applications that this framework is intended to best support. |
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364 * </ul> |
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365 **/ |
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366 |
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367 public void stats() { |
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368 long time = System.currentTimeMillis() - initTime; |
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369 double secs = ((double)time) / 1000.0; |
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370 long totalRuns = 0; |
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371 long totalScans = 0; |
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372 long totalSteals = 0; |
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373 |
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374 System.out.print("Thread" + |
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375 "\tQ Cap" + |
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376 "\tScans" + |
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377 "\tNew" + |
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378 "\tRuns" + |
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379 "\n"); |
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380 |
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381 for (int i = 0; i < threads.length; ++i) { |
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382 FJTaskRunner t = threads[i]; |
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383 int truns = t.runs; |
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384 totalRuns += truns; |
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385 |
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386 int tscans = t.scans; |
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387 totalScans += tscans; |
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388 |
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389 int tsteals = t.steals; |
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390 totalSteals += tsteals; |
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391 |
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392 String star = (getActive(t))? "*" : " "; |
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393 |
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394 |
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395 System.out.print("T" + i + star + |
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396 "\t" + t.deqSize() + |
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397 "\t" + tscans + |
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398 "\t" + tsteals + |
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399 "\t" + truns + |
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400 "\n"); |
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401 } |
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402 |
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403 System.out.print("Total" + |
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404 "\t " + |
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405 "\t" + totalScans + |
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406 "\t" + totalSteals + |
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407 "\t" + totalRuns + |
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408 "\n"); |
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409 |
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410 System.out.print("Execute: " + entries); |
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411 |
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412 System.out.print("\tTime: " + secs); |
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413 |
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414 long rps = 0; |
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415 if (secs != 0) rps = Math.round((double)(totalRuns) / secs); |
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416 |
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417 System.out.println("\tRate: " + rps); |
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418 } |
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419 |
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420 |
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421 /* ------------ Methods called only by FJTaskRunners ------------- */ |
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422 |
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423 |
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424 /** |
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425 * Return the array of threads in this group. |
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426 * Called only by FJTaskRunner.scan(). |
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427 **/ |
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428 |
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429 protected FJTaskRunner[] getArray() { return threads; } |
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430 |
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431 |
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432 /** |
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433 * Return a task from entry queue, or null if empty. |
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434 * Called only by FJTaskRunner.scan(). |
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435 **/ |
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436 |
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437 protected FJTask pollEntryQueue() { |
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438 try { |
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439 FJTask t = (FJTask)(entryQueue.poll(0)); |
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440 return t; |
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441 } |
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442 catch(InterruptedException ex) { // ignore interrupts |
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443 Thread.currentThread().interrupt(); |
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444 return null; |
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445 } |
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446 } |
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447 |
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448 |
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449 /** |
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450 * Return active status of t. |
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451 * Per-thread active status can only be accessed and |
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452 * modified via synchronized method here in the group class. |
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453 **/ |
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454 |
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455 protected synchronized boolean getActive(FJTaskRunner t) { |
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456 return t.active; |
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457 } |
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458 |
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459 |
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460 /** |
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461 * Set active status of thread t to true, and notify others |
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462 * that might be waiting for work. |
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463 **/ |
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464 |
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465 protected synchronized void setActive(FJTaskRunner t) { |
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466 if (!t.active) { |
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467 t.active = true; |
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468 ++activeCount; |
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469 if (nstarted < threads.length) |
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470 threads[nstarted++].start(); |
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471 else |
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472 notifyAll(); |
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473 } |
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474 } |
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475 |
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476 /** |
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477 * Set active status of thread t to false. |
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478 **/ |
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479 |
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480 protected synchronized void setInactive(FJTaskRunner t) { |
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481 if (t.active) { |
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482 t.active = false; |
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483 --activeCount; |
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484 } |
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485 } |
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486 |
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487 /** |
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488 * The number of times to scan other threads for tasks |
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489 * before transitioning to a mode where scans are |
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490 * interleaved with sleeps (actually timed waits). |
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491 * Upon transition, sleeps are for duration of |
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492 * scans / SCANS_PER_SLEEP milliseconds. |
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493 * <p> |
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494 * This is not treated as a user-tunable parameter because |
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495 * good values do not appear to vary much across JVMs or |
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496 * applications. Its main role is to help avoid some |
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497 * useless spinning and contention during task startup. |
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498 **/ |
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499 static final long SCANS_PER_SLEEP = 15; |
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500 |
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501 /** |
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502 * The maximum time (in msecs) to sleep when a thread is idle, |
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503 * yet others are not, so may eventually generate work that |
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504 * the current thread can steal. This value reflects the maximum time |
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505 * that a thread may sleep when it possibly should not, because there |
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506 * are other active threads that might generate work. In practice, |
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507 * designs in which some threads become stalled because others |
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508 * are running yet not generating tasks are not likely to work |
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509 * well in this framework anyway, so the exact value does not matter |
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510 * too much. However, keeping it in the sub-second range does |
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511 * help smooth out startup and shutdown effects. |
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512 **/ |
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513 |
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514 static final long MAX_SLEEP_TIME = 100; |
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515 |
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516 /** |
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parents:
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517 * Set active status of thread t to false, and |
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518 * then wait until: (a) there is a task in the entry |
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519 * queue, or (b) other threads are active, or (c) the current |
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520 * thread is interrupted. Upon return, it |
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521 * is not certain that there will be work available. |
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522 * The thread must itself check. |
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523 * <p> |
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524 * The main underlying reason |
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525 * for these mechanics is that threads do not |
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526 * signal each other when they add elements to their queues. |
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527 * (This would add to task overhead, reduce locality. |
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528 * and increase contention.) |
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parents:
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529 * So we must rely on a tamed form of polling. However, tasks |
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530 * inserted into the entry queue do result in signals, so |
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531 * tasks can wait on these if all of them are otherwise idle. |
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532 **/ |
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533 |
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534 protected synchronized void checkActive(FJTaskRunner t, long scans) { |
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535 |
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536 setInactive(t); |
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537 |
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538 try { |
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539 // if nothing available, do a hard wait |
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540 if (activeCount == 0 && entryQueue.peek() == null) { |
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541 wait(); |
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542 } |
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543 else { |
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544 // If there is possibly some work, |
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545 // sleep for a while before rechecking |
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546 |
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547 long msecs = scans / SCANS_PER_SLEEP; |
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548 if (msecs > MAX_SLEEP_TIME) msecs = MAX_SLEEP_TIME; |
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549 int nsecs = (msecs == 0) ? 1 : 0; // forces shortest possible sleep |
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550 wait(msecs, nsecs); |
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551 } |
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552 } |
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553 catch (InterruptedException ex) { |
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554 notify(); // avoid lost notifies on interrupts |
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555 Thread.currentThread().interrupt(); |
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556 } |
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557 } |
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558 |
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559 /* ------------ Utility methods ------------- */ |
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560 |
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561 /** |
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|
562 * Start or wake up any threads waiting for work |
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563 **/ |
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|
564 |
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565 protected synchronized void signalNewTask() { |
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566 if (COLLECT_STATS) ++entries; |
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567 if (nstarted < threads.length) |
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568 threads[nstarted++].start(); |
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|
569 else |
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570 notify(); |
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571 } |
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|
572 |
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|
573 /** |
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574 * Create all FJTaskRunner threads in this group. |
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575 **/ |
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576 |
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577 protected void initializeThreads() { |
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578 for (int i = 0; i < threads.length; ++i) threads[i] = new FJTaskRunner(this); |
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|
579 } |
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580 |
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581 |
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582 |
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583 |
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584 /** |
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585 * Wrap wait/notify mechanics around a task so that |
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586 * invoke() can wait it out |
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587 **/ |
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|
588 protected static final class InvokableFJTask extends FJTask { |
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589 protected final Runnable wrapped; |
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590 protected boolean terminated = false; |
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591 |
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592 protected InvokableFJTask(Runnable r) { wrapped = r; } |
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593 |
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594 public void run() { |
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595 try { |
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596 if (wrapped instanceof FJTask) |
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597 FJTask.invoke((FJTask)(wrapped)); |
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598 else |
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599 wrapped.run(); |
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parents:
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600 } |
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601 finally { |
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602 setTerminated(); |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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603 } |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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604 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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605 |
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Dan Creswell <dan.creswell@gmail.com>
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606 protected synchronized void setTerminated() { |
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607 terminated = true; |
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608 notifyAll(); |
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Dan Creswell <dan.creswell@gmail.com>
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609 } |
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parents:
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610 |
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611 protected synchronized void awaitTermination() throws InterruptedException { |
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612 while (!terminated) wait(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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613 } |
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Dan Creswell <dan.creswell@gmail.com>
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614 } |
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615 |
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616 |
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617 } |
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618 |