OptaPlanner - CloudBalancingHelloWorld.java - 无法达到 solver.getBestSolution()？
OptaPlanner - CloudBalancingHelloWorld.java - can not reach to solver.getBestSolution()?
问题：
在示例 - CloudBalancing 中，为什么此应用程序无法到达 solver.getBestSolution()？该应用程序总是 运行 在 solver.solve(unsolvedCloudBalance);。
有什么建议吗？
一些可能的解决方案是在 solver.solve(unsolvedCloudBalance); 完成，然后获取 solver.getBestSolution()?
/*
* Copyright 2012 JBoss Inc
*
......
*/
......
public class CloudBalancingHelloWorld {
public static void main(String[] args) {
// Build the Solver
SolverFactory solverFactory = SolverFactory.createFromXmlResource(
"org/optaplanner/examples/cloudbalancing/solver/cloudBalancingSolverConfig.xml");
Solver solver = solverFactory.buildSolver();
// Load a problem with 2 computers and 6 processes
CloudBalance unsolvedCloudBalance = new CloudBalancingGenerator().createCloudBalance(2, 6);
// Solve the problem
System.out.println("Test - solver - before");
solver.solve(unsolvedCloudBalance);
System.out.println("Test - solver - after");
// Display the result
CloudBalance solvedCloudBalance = (CloudBalance) solver.getBestSolution();
System.out.println("\nSolved cloudBalance with 2 computers and 6 processes:\n"
+ toDisplayString(solvedCloudBalance));
}
public static String toDisplayString(CloudBalance cloudBalance) {
StringBuilder displayString = new StringBuilder();
for (CloudProcess process : cloudBalance.getProcessList()) {
CloudComputer computer = process.getComputer();
displayString.append(" ").append(process.getLabel()).append(" -> ")
.append(computer == null ? null : computer.getLabel()).append("\n");
}
return displayString.toString();
}
}
我假设您没有编辑示例的求解器配置 XML 文件。
如果您查看正在加载 Solver configuration from 的 XML 文件，它没有终止条款。基本上，您是在告诉求解器永远 运行。
您可以编辑求解器配置 XML 文件，让它在给定条件后终止。请参阅 the documentation 了解如何执行此操作。
如果您想以编程方式执行此操作，请查看 JavaDoc：SolverConfig#setTerminationConfig method of the SolverConfig class and the TerminationConfig class. You will need to edit the SolverConfig of the SolverFactory after loading the XML file: see the SolverFactory#getSolverConfig 方法。
非常感谢，oskopek，按照您的建议解决了这个问题。
您的建议是：
您可以编辑求解器配置 XML 文件，让它在给定条件后终止。请参阅有关如何执行此操作的文档。
我做的是：
修改cloudBalancingSolverConfig.xml，使用终止符如下。然后应用程序在 120 秒后退出 运行.
<termination>
<secondsSpentLimit>120</secondsSpentLimit>
</termination>
以下是 2 台计算机和 6 个进程的应用程序的输出：
09:57:24.791 [main] INFO o.d.c.k.b.impl.KieRepositoryImpl - KieModule was added: MemoryKieModule[releaseId=org.default:artifact:1.0.0-SNAPSHOT]
09:57:24.963 [main] DEBUG o.drools.core.impl.KnowledgeBaseImpl - Starting Engine in PHREAK mode
Test - solver - before
09:57:25.182 [main] INFO o.o.core.impl.solver.DefaultSolver - Solving started: time spent (110), best score (uninitialized/0hard/0soft), environment mode (REPRODUCIBLE), random (JDK with seed 0).
09:57:25.213 [main] DEBUG o.o.c.i.c.DefaultConstructionHeuristicPhase - CH step (0), time spent (141), score (0hard/-6000soft), selected move count (2), picked move (com.optaplanner.cloudbalancing.domain.CloudProcess@34abdee4 => com.optaplanner.cloudbalancing.domain.CloudComputer@1f130eaf).
09:57:25.228 [main] DEBUG o.o.c.i.c.DefaultConstructionHeuristicPhase - CH step (1), time spent (156), score (0hard/-6000soft), selected move count (2), picked move (com.optaplanner.cloudbalancing.domain.CloudProcess@1494b84d => com.optaplanner.cloudbalancing.domain.CloudComputer@1f130eaf).
09:57:25.228 [main] DEBUG o.o.c.i.c.DefaultConstructionHeuristicPhase - CH step (2), time spent (156), score (0hard/-6000soft), selected move count (2), picked move (com.optaplanner.cloudbalancing.domain.CloudProcess@655a5d9c => com.optaplanner.cloudbalancing.domain.CloudComputer@1f130eaf).
09:57:25.244 [main] DEBUG o.o.c.i.c.DefaultConstructionHeuristicPhase - CH step (3), time spent (172), score (0hard/-6000soft), selected move count (2), picked move (com.optaplanner.cloudbalancing.domain.CloudProcess@1b5bc39d => com.optaplanner.cloudbalancing.domain.CloudComputer@1f130eaf).
09:57:25.244 [main] DEBUG o.o.c.i.c.DefaultConstructionHeuristicPhase - CH step (4), time spent (172), score (0hard/-6000soft), selected move count (2), picked move (com.optaplanner.cloudbalancing.domain.CloudProcess@bc57b40 => com.optaplanner.cloudbalancing.domain.CloudComputer@1f130eaf).
09:57:25.260 [main] DEBUG o.o.c.i.c.DefaultConstructionHeuristicPhase - CH step (5), time spent (188), score (0hard/-6000soft), selected move count (2), picked move (com.optaplanner.cloudbalancing.domain.CloudProcess@21362712 => com.optaplanner.cloudbalancing.domain.CloudComputer@1f130eaf).
09:57:25.260 [main] INFO o.o.c.i.c.DefaultConstructionHeuristicPhase - Construction Heuristic phase (0) ended: step total (6), time spent (188), best score (0hard/-6000soft).
09:57:25.712 [main] DEBUG o.o.c.i.l.DefaultLocalSearchPhase - LS step (0), time spent (640), score (0hard/-8000soft), best score (0hard/-6000soft), accepted/selected move count (1000/1000), picked move ([com.optaplanner.cloudbalancing.domain.CloudProcess@2575f671, com.optaplanner.cloudbalancing.domain.CloudProcess@72bca894, com.optaplanner.cloudbalancing.domain.CloudProcess@503d56b5, com.optaplanner.cloudbalancing.domain.CloudProcess@433ffad1, com.optaplanner.cloudbalancing.domain.CloudProcess@1fc793c2, com.optaplanner.cloudbalancing.domain.CloudProcess@324dcd31] => com.optaplanner.cloudbalancing.domain.CloudComputer@758f4f03).
09:59:25.083 [main] DEBUG o.o.c.i.l.DefaultLocalSearchPhase - LS step (1), time spent (120011), score (0hard/-6000soft), best score (0hard/-6000soft), accepted/selected move count (0/10162968), picked move ([com.optaplanner.cloudbalancing.domain.CloudProcess@503d56b5, com.optaplanner.cloudbalancing.domain.CloudProcess@72bca894, com.optaplanner.cloudbalancing.domain.CloudProcess@324dcd31, com.optaplanner.cloudbalancing.domain.CloudProcess@433ffad1, com.optaplanner.cloudbalancing.domain.CloudProcess@2575f671, com.optaplanner.cloudbalancing.domain.CloudProcess@1fc793c2] => com.optaplanner.cloudbalancing.domain.CloudComputer@1f130eaf).
09:59:25.083 [main] INFO o.o.c.i.l.DefaultLocalSearchPhase - Local Search phase (1) ended: step total (2), time spent (120011), best score (0hard/-6000soft).
09:59:25.083 [main] INFO o.o.core.impl.solver.DefaultSolver - Solving ended: time spent (120011), best score (0hard/-6000soft), average calculate count per second (84692), environment mode (REPRODUCIBLE).
Test - solver - after
Solved cloudBalance with 2 computers and 6 processes:
问题：
在示例 - CloudBalancing 中，为什么此应用程序无法到达 solver.getBestSolution()？该应用程序总是 运行 在 solver.solve(unsolvedCloudBalance);。
有什么建议吗？
一些可能的解决方案是在 solver.solve(unsolvedCloudBalance); 完成，然后获取 solver.getBestSolution()?
/*
* Copyright 2012 JBoss Inc
*
......
*/
......
public class CloudBalancingHelloWorld {
public static void main(String[] args) {
// Build the Solver
SolverFactory solverFactory = SolverFactory.createFromXmlResource(
"org/optaplanner/examples/cloudbalancing/solver/cloudBalancingSolverConfig.xml");
Solver solver = solverFactory.buildSolver();
// Load a problem with 2 computers and 6 processes
CloudBalance unsolvedCloudBalance = new CloudBalancingGenerator().createCloudBalance(2, 6);
// Solve the problem
System.out.println("Test - solver - before");
solver.solve(unsolvedCloudBalance);
System.out.println("Test - solver - after");
// Display the result
CloudBalance solvedCloudBalance = (CloudBalance) solver.getBestSolution();
System.out.println("\nSolved cloudBalance with 2 computers and 6 processes:\n"
+ toDisplayString(solvedCloudBalance));
}
public static String toDisplayString(CloudBalance cloudBalance) {
StringBuilder displayString = new StringBuilder();
for (CloudProcess process : cloudBalance.getProcessList()) {
CloudComputer computer = process.getComputer();
displayString.append(" ").append(process.getLabel()).append(" -> ")
.append(computer == null ? null : computer.getLabel()).append("\n");
}
return displayString.toString();
}
}
我假设您没有编辑示例的求解器配置 XML 文件。
如果您查看正在加载 Solver configuration from 的 XML 文件，它没有终止条款。基本上，您是在告诉求解器永远 运行。
您可以编辑求解器配置 XML 文件，让它在给定条件后终止。请参阅 the documentation 了解如何执行此操作。
如果您想以编程方式执行此操作，请查看 JavaDoc：SolverConfig#setTerminationConfig method of the SolverConfig class and the TerminationConfig class. You will need to edit the SolverConfig of the SolverFactory after loading the XML file: see the SolverFactory#getSolverConfig 方法。
非常感谢，oskopek，按照您的建议解决了这个问题。
您的建议是：
您可以编辑求解器配置 XML 文件，让它在给定条件后终止。请参阅有关如何执行此操作的文档。
我做的是：
修改cloudBalancingSolverConfig.xml，使用终止符如下。然后应用程序在 120 秒后退出 运行.
<termination>
<secondsSpentLimit>120</secondsSpentLimit>
</termination>
以下是 2 台计算机和 6 个进程的应用程序的输出：
09:57:24.791 [main] INFO o.d.c.k.b.impl.KieRepositoryImpl - KieModule was added: MemoryKieModule[releaseId=org.default:artifact:1.0.0-SNAPSHOT]
09:57:24.963 [main] DEBUG o.drools.core.impl.KnowledgeBaseImpl - Starting Engine in PHREAK mode
Test - solver - before
09:57:25.182 [main] INFO o.o.core.impl.solver.DefaultSolver - Solving started: time spent (110), best score (uninitialized/0hard/0soft), environment mode (REPRODUCIBLE), random (JDK with seed 0).
09:57:25.213 [main] DEBUG o.o.c.i.c.DefaultConstructionHeuristicPhase - CH step (0), time spent (141), score (0hard/-6000soft), selected move count (2), picked move (com.optaplanner.cloudbalancing.domain.CloudProcess@34abdee4 => com.optaplanner.cloudbalancing.domain.CloudComputer@1f130eaf).
09:57:25.228 [main] DEBUG o.o.c.i.c.DefaultConstructionHeuristicPhase - CH step (1), time spent (156), score (0hard/-6000soft), selected move count (2), picked move (com.optaplanner.cloudbalancing.domain.CloudProcess@1494b84d => com.optaplanner.cloudbalancing.domain.CloudComputer@1f130eaf).
09:57:25.228 [main] DEBUG o.o.c.i.c.DefaultConstructionHeuristicPhase - CH step (2), time spent (156), score (0hard/-6000soft), selected move count (2), picked move (com.optaplanner.cloudbalancing.domain.CloudProcess@655a5d9c => com.optaplanner.cloudbalancing.domain.CloudComputer@1f130eaf).
09:57:25.244 [main] DEBUG o.o.c.i.c.DefaultConstructionHeuristicPhase - CH step (3), time spent (172), score (0hard/-6000soft), selected move count (2), picked move (com.optaplanner.cloudbalancing.domain.CloudProcess@1b5bc39d => com.optaplanner.cloudbalancing.domain.CloudComputer@1f130eaf).
09:57:25.244 [main] DEBUG o.o.c.i.c.DefaultConstructionHeuristicPhase - CH step (4), time spent (172), score (0hard/-6000soft), selected move count (2), picked move (com.optaplanner.cloudbalancing.domain.CloudProcess@bc57b40 => com.optaplanner.cloudbalancing.domain.CloudComputer@1f130eaf).
09:57:25.260 [main] DEBUG o.o.c.i.c.DefaultConstructionHeuristicPhase - CH step (5), time spent (188), score (0hard/-6000soft), selected move count (2), picked move (com.optaplanner.cloudbalancing.domain.CloudProcess@21362712 => com.optaplanner.cloudbalancing.domain.CloudComputer@1f130eaf).
09:57:25.260 [main] INFO o.o.c.i.c.DefaultConstructionHeuristicPhase - Construction Heuristic phase (0) ended: step total (6), time spent (188), best score (0hard/-6000soft).
09:57:25.712 [main] DEBUG o.o.c.i.l.DefaultLocalSearchPhase - LS step (0), time spent (640), score (0hard/-8000soft), best score (0hard/-6000soft), accepted/selected move count (1000/1000), picked move ([com.optaplanner.cloudbalancing.domain.CloudProcess@2575f671, com.optaplanner.cloudbalancing.domain.CloudProcess@72bca894, com.optaplanner.cloudbalancing.domain.CloudProcess@503d56b5, com.optaplanner.cloudbalancing.domain.CloudProcess@433ffad1, com.optaplanner.cloudbalancing.domain.CloudProcess@1fc793c2, com.optaplanner.cloudbalancing.domain.CloudProcess@324dcd31] => com.optaplanner.cloudbalancing.domain.CloudComputer@758f4f03).
09:59:25.083 [main] DEBUG o.o.c.i.l.DefaultLocalSearchPhase - LS step (1), time spent (120011), score (0hard/-6000soft), best score (0hard/-6000soft), accepted/selected move count (0/10162968), picked move ([com.optaplanner.cloudbalancing.domain.CloudProcess@503d56b5, com.optaplanner.cloudbalancing.domain.CloudProcess@72bca894, com.optaplanner.cloudbalancing.domain.CloudProcess@324dcd31, com.optaplanner.cloudbalancing.domain.CloudProcess@433ffad1, com.optaplanner.cloudbalancing.domain.CloudProcess@2575f671, com.optaplanner.cloudbalancing.domain.CloudProcess@1fc793c2] => com.optaplanner.cloudbalancing.domain.CloudComputer@1f130eaf).
09:59:25.083 [main] INFO o.o.c.i.l.DefaultLocalSearchPhase - Local Search phase (1) ended: step total (2), time spent (120011), best score (0hard/-6000soft).
09:59:25.083 [main] INFO o.o.core.impl.solver.DefaultSolver - Solving ended: time spent (120011), best score (0hard/-6000soft), average calculate count per second (84692), environment mode (REPRODUCIBLE).
Test - solver - after
Solved cloudBalance with 2 computers and 6 processes: