annotate Implab/Parallels/ArrayTraits.cs @ 125:f803565868a4 v2

improved performance of promises
author cin
date Thu, 15 Jan 2015 12:09:20 +0300
parents a336cb13c6a9
children 706fccb85524
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1 using Implab.Diagnostics;
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2 using System;
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3 using System.Diagnostics;
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4 using System.Threading;
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5
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6 namespace Implab.Parallels {
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7 public static class ArrayTraits {
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8 class ArrayIterator<TSrc> : DispatchPool<int> {
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9 readonly Action<TSrc> m_action;
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10 readonly TSrc[] m_source;
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11 readonly Promise<int> m_promise = new Promise<int>();
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12 readonly LogicalOperation m_logicalOperation;
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13
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14 int m_pending;
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15 int m_next;
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17 public ArrayIterator(TSrc[] source, Action<TSrc> action, int threads)
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18 : base(threads) {
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19
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20 Debug.Assert(source != null);
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21 Debug.Assert(action != null);
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22
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23 m_logicalOperation = TraceContext.Instance.CurrentOperation;
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24 m_next = 0;
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25 m_source = source;
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26 m_pending = source.Length;
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27 m_action = action;
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29 m_promise.On(Dispose, PromiseEventType.All);
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30
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31 InitPool();
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32 }
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33
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34 public Promise<int> Promise {
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35 get {
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36 return m_promise;
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37 }
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38 }
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39
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40 protected override void Worker() {
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41 TraceContext.Instance.EnterLogicalOperation(m_logicalOperation, false);
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42 try {
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43 base.Worker();
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44 } finally {
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45 TraceContext.Instance.Leave();
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46 }
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47 }
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48
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49 protected override bool TryDequeue(out int unit) {
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50 unit = Interlocked.Increment(ref m_next) - 1;
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51 return unit < m_source.Length;
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52 }
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53
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54 protected override void InvokeUnit(int unit) {
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55 try {
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56 m_action(m_source[unit]);
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57 var pending = Interlocked.Decrement(ref m_pending);
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58 if (pending == 0)
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59 m_promise.Resolve(m_source.Length);
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60 } catch (Exception e) {
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61 m_promise.Reject(e);
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62 }
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63 }
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64 }
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65
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66 class ArrayMapper<TSrc, TDst>: DispatchPool<int> {
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67 readonly Func<TSrc, TDst> m_transform;
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68 readonly TSrc[] m_source;
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69 readonly TDst[] m_dest;
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70 readonly Promise<TDst[]> m_promise = new Promise<TDst[]>();
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71 readonly LogicalOperation m_logicalOperation;
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72
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73 int m_pending;
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74 int m_next;
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76 public ArrayMapper(TSrc[] source, Func<TSrc, TDst> transform, int threads)
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77 : base(threads) {
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78
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79 Debug.Assert (source != null);
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80 Debug.Assert( transform != null);
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81
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82 m_next = 0;
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83 m_source = source;
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84 m_dest = new TDst[source.Length];
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85 m_pending = source.Length;
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86 m_transform = transform;
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87 m_logicalOperation = TraceContext.Instance.CurrentOperation;
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88
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89 m_promise.On(Dispose, PromiseEventType.All);
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90
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91 InitPool();
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92 }
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93
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94 public Promise<TDst[]> Promise {
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95 get {
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96 return m_promise;
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97 }
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98 }
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99
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100 protected override void Worker() {
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101 TraceContext.Instance.EnterLogicalOperation(m_logicalOperation,false);
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102 try {
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103 base.Worker();
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104 } finally {
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105 TraceContext.Instance.Leave();
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106 }
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107 }
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108
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109 protected override bool TryDequeue(out int unit) {
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110 unit = Interlocked.Increment(ref m_next) - 1;
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111 return unit < m_source.Length;
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112 }
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113
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114 protected override void InvokeUnit(int unit) {
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115 try {
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116 m_dest[unit] = m_transform(m_source[unit]);
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117 var pending = Interlocked.Decrement(ref m_pending);
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118 if (pending == 0)
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119 m_promise.Resolve(m_dest);
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120 } catch (Exception e) {
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121 m_promise.Reject(e);
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122 }
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123 }
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124 }
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125
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126 public static IPromise<TDst[]> ParallelMap<TSrc, TDst> (this TSrc[] source, Func<TSrc,TDst> transform, int threads) {
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127 if (source == null)
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128 throw new ArgumentNullException("source");
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129 if (transform == null)
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130 throw new ArgumentNullException("transform");
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131
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132 var mapper = new ArrayMapper<TSrc, TDst>(source, transform, threads);
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133 return mapper.Promise;
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134 }
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135
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136 public static IPromise<int> ParallelForEach<TSrc>(this TSrc[] source, Action<TSrc> action, int threads) {
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137 if (source == null)
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138 throw new ArgumentNullException("source");
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139 if (action == null)
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140 throw new ArgumentNullException("action");
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141
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142 var iter = new ArrayIterator<TSrc>(source, action, threads);
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143 return iter.Promise;
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144 }
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145
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146 public static IPromise<TDst[]> ChainedMap<TSrc, TDst>(this TSrc[] source, Func<TSrc, IPromise<TDst>> transform, int threads) {
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147 if (source == null)
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148 throw new ArgumentNullException("source");
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149 if (transform == null)
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150 throw new ArgumentNullException("transform");
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151 if (threads <= 0)
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152 throw new ArgumentOutOfRangeException("threads","Threads number must be greater then zero");
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153
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154 if (source.Length == 0)
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155 return Promise<TDst[]>.ResultToPromise(new TDst[0]);
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156
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157 var promise = new Promise<TDst[]>();
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158 var res = new TDst[source.Length];
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159 var pending = source.Length;
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160
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161 object locker = new object();
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162 int slots = threads;
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163
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164 // Analysis disable AccessToDisposedClosure
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165 AsyncPool.RunThread<int>(() => {
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166 for (int i = 0; i < source.Length; i++) {
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167 if(promise.IsResolved)
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168 break; // stop processing in case of error or cancellation
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169 var idx = i;
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170
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171 if (Interlocked.Decrement(ref slots) < 0) {
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172 lock(locker) {
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173 while(slots < 0)
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174 Monitor.Wait(locker);
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175 }
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176 }
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177
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178 try {
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179 transform(source[i])
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180 .On( x => {
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181 Interlocked.Increment(ref slots);
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182 lock (locker) {
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183 Monitor.Pulse(locker);
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184 }
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185 })
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186 .On(
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187 x => {
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188 res[idx] = x;
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189 var left = Interlocked.Decrement(ref pending);
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190 if (left == 0)
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191 promise.Resolve(res);
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192 },
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193 promise.Reject
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194 );
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195
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196 } catch (Exception e) {
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197 promise.Reject(e);
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198 }
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199 }
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200 return 0;
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201 });
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202
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203 return promise;
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204 }
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205
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206 }
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207 }