[5176] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[9539] | 3 | * Copyright (C) 2002-2013 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[5176] | 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using System;
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| 23 | using System.Collections.Generic;
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| 24 | using System.Threading;
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| 25 | using System.Threading.Tasks;
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| 26 | using HeuristicLab.Common;
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| 27 | using HeuristicLab.Core;
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| 28 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 29 |
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| 30 | namespace HeuristicLab.ParallelEngine {
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| 31 | /// <summary>
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| 32 | /// Represents an engine that executes its steps in parallel (if possible) using multiple threads.
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| 33 | /// This engine is suitable for parallel processing on shared memory systems which provide multiple cores.
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| 34 | /// </summary>
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| 35 | [StorableClass]
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| 36 | [Item("Parallel Engine", "Engine for parallel execution of algorithms using multiple threads (suitable for shared memory systems with multiple cores).")]
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| 37 | public class ParallelEngine : Engine {
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| 38 | private CancellationToken cancellationToken;
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[9323] | 39 | private ParallelOptions parallelOptions;
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[5176] | 40 |
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[9323] | 41 | [Storable(DefaultValue = -1)]
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| 42 | private int degreeOfParallelism;
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| 43 | public int DegreeOfParallelism {
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| 44 | get { return degreeOfParallelism; }
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| 45 | set {
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| 46 | if (degreeOfParallelism != value) {
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| 47 | degreeOfParallelism = value;
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| 48 | OnDegreeOfParallelismChanged();
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| 49 | }
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| 50 | }
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| 51 | }
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| 52 |
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[5176] | 53 | [StorableConstructor]
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| 54 | protected ParallelEngine(bool deserializing) : base(deserializing) { }
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[9323] | 55 | protected ParallelEngine(ParallelEngine original, Cloner cloner)
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| 56 | : base(original, cloner) {
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| 57 | this.DegreeOfParallelism = original.DegreeOfParallelism;
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| 58 | }
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[9326] | 59 | public ParallelEngine()
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| 60 | : base() {
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| 61 | this.degreeOfParallelism = -1;
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| 62 | }
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[5176] | 63 |
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| 64 | public override IDeepCloneable Clone(Cloner cloner) {
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| 65 | return new ParallelEngine(this, cloner);
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| 66 | }
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| 67 |
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[9323] | 68 | public event EventHandler DegreeOfParallelismChanged;
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| 69 | protected void OnDegreeOfParallelismChanged() {
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| 70 | var handler = DegreeOfParallelismChanged;
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| 71 | if (handler != null) handler(this, EventArgs.Empty);
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| 72 | }
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| 73 |
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| 74 |
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[5185] | 75 | protected override void Run(CancellationToken cancellationToken) {
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| 76 | this.cancellationToken = cancellationToken;
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[9323] | 77 | parallelOptions = new ParallelOptions();
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| 78 | parallelOptions.MaxDegreeOfParallelism = DegreeOfParallelism;
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[9444] | 79 | parallelOptions.CancellationToken = cancellationToken;
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[5185] | 80 | Run(ExecutionStack);
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[5176] | 81 | }
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| 82 |
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[5185] | 83 | private void Run(object state) {
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[5176] | 84 | Stack<IOperation> executionStack = (Stack<IOperation>)state;
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[5185] | 85 | IOperation next;
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| 86 | OperationCollection coll;
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| 87 | IAtomicOperation operation;
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[5176] | 88 |
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[5185] | 89 | while (executionStack.Count > 0) {
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| 90 | cancellationToken.ThrowIfCancellationRequested();
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| 91 |
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| 92 | next = executionStack.Pop();
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| 93 | if (next is OperationCollection) {
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| 94 | coll = (OperationCollection)next;
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| 95 | if (coll.Parallel) {
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| 96 | Stack<IOperation>[] stacks = new Stack<IOperation>[coll.Count];
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| 97 | for (int i = 0; i < coll.Count; i++) {
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| 98 | stacks[i] = new Stack<IOperation>();
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| 99 | stacks[i].Push(coll[i]);
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| 100 | }
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| 101 | try {
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[9323] | 102 | Parallel.ForEach(stacks, parallelOptions, Run);
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[5185] | 103 | }
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[9444] | 104 | catch (OperationCanceledException ex) {
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[5185] | 105 | OperationCollection remaining = new OperationCollection() { Parallel = true };
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| 106 | for (int i = 0; i < stacks.Length; i++) {
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| 107 | if (stacks[i].Count == 1)
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| 108 | remaining.Add(stacks[i].Pop());
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| 109 | if (stacks[i].Count > 1) {
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| 110 | OperationCollection ops = new OperationCollection();
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| 111 | while (stacks[i].Count > 0)
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| 112 | ops.Add(stacks[i].Pop());
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| 113 | remaining.Add(ops);
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| 114 | }
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| 115 | }
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| 116 | if (remaining.Count > 0) executionStack.Push(remaining);
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| 117 | throw ex;
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| 118 | }
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| 119 | } else {
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| 120 | for (int i = coll.Count - 1; i >= 0; i--)
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[5187] | 121 | if (coll[i] != null) executionStack.Push(coll[i]);
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[5176] | 122 | }
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[5185] | 123 | } else if (next is IAtomicOperation) {
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| 124 | operation = (IAtomicOperation)next;
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[5176] | 125 | try {
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[5185] | 126 | next = operation.Operator.Execute((IExecutionContext)operation, cancellationToken);
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[5176] | 127 | }
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[5185] | 128 | catch (Exception ex) {
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| 129 | executionStack.Push(operation);
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[5187] | 130 | if (ex is OperationCanceledException) throw ex;
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| 131 | else throw new OperatorExecutionException(operation.Operator, ex);
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[5176] | 132 | }
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[5185] | 133 | if (next != null) executionStack.Push(next);
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[5187] | 134 |
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| 135 | if (operation.Operator.Breakpoint) {
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| 136 | string message = string.Format("Breakpoint: {0}", operation.Operator.Name != string.Empty ? operation.Operator.Name : operation.Operator.ItemName);
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| 137 | Log.LogMessage(message);
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| 138 | throw new OperationCanceledException(message);
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| 139 | }
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[5176] | 140 | }
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| 141 | }
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| 142 | }
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| 143 | }
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| 144 | }
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