| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.sysds.runtime.controlprogram.parfor.opt; |
| |
| import org.apache.sysds.parser.ParForStatementBlock; |
| import org.apache.sysds.runtime.controlprogram.ParForProgramBlock; |
| import org.apache.sysds.runtime.controlprogram.ParForProgramBlock.POptMode; |
| import org.apache.sysds.runtime.controlprogram.context.ExecutionContext; |
| |
| |
| /** |
| * Generic optimizer super class that defines the interface of all implemented optimizers. |
| * Furthermore it implements basic primitives, used by all optimizers such as the enumeration |
| * of plan alternatives and specific rewrites. |
| * |
| * Optimization objective: \phi: \min T(prog) | k \leq ck \wedge m(prog) \leq cm |
| * with T(p)=max_(1\leq i\leq k)(T(prog_i). |
| * |
| */ |
| public abstract class Optimizer |
| { |
| protected long _numTotalPlans = -1; |
| protected long _numEvaluatedPlans = -1; |
| |
| public enum PlanInputType { |
| ABSTRACT_PLAN, |
| RUNTIME_PLAN |
| } |
| |
| public enum CostModelType { |
| STATIC_MEM_METRIC, |
| RUNTIME_METRICS |
| } |
| |
| protected Optimizer() |
| { |
| _numTotalPlans = 0; |
| _numEvaluatedPlans = 0; |
| } |
| |
| /** |
| * Optimize |
| * |
| * @param sb parfor statement block |
| * @param pb parfor program block |
| * @param plan complete plan of a top-level parfor |
| * @param est cost estimator |
| * @param ec execution context |
| * @return true if plan changed, false otherwise |
| */ |
| public abstract boolean optimize(ParForStatementBlock sb, ParForProgramBlock pb, OptTree plan, CostEstimator est, ExecutionContext ec); |
| |
| public abstract PlanInputType getPlanInputType(); |
| |
| public abstract CostModelType getCostModelType(); |
| |
| public abstract POptMode getOptMode(); |
| |
| |
| /////// |
| //methods for evaluating the overall properties and costing |
| |
| public long getNumTotalPlans() { |
| return _numTotalPlans; |
| } |
| |
| public long getNumEvaluatedPlans() { |
| return _numEvaluatedPlans; |
| } |
| } |