| /* |
| * 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.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.sysds.runtime.DMLRuntimeException; |
| import org.apache.sysds.runtime.controlprogram.ParForProgramBlock.POptMode; |
| import org.apache.sysds.runtime.controlprogram.parfor.opt.CostEstimator.TestMeasure; |
| |
| |
| /** |
| * Heuristic ParFor Optimizer: This optimizer extends the rule-based |
| * optimizer by a time-based cost estimate for execution type decisions. |
| * |
| * |
| */ |
| public class OptimizerHeuristic extends OptimizerRuleBased { |
| private static final Log LOG = LogFactory.getLog(OptimizerHeuristic.class.getName()); |
| public static final double EXEC_TIME_THRESHOLD = 30000; //in ms |
| |
| @Override |
| public CostModelType getCostModelType() { |
| return CostModelType.RUNTIME_METRICS; |
| } |
| |
| @Override |
| public POptMode getOptMode() { |
| return POptMode.HEURISTIC; |
| } |
| |
| //////////////////////////////////////////////////// |
| // Overwritten rewrites (see rulebased optimizer) // |
| //////////////////////////////////////////////////// |
| |
| /** |
| * Used as one condition in rewriteSetExecutionStategy in order to decide if |
| * MR execution makes sense if all the other constraints are given. |
| */ |
| @Override |
| protected boolean isLargeProblem(OptNode pn, double M) |
| { |
| boolean ret = false; |
| |
| try |
| { |
| double T = _cost.getEstimate(TestMeasure.EXEC_TIME, pn); |
| ret = (T >= EXEC_TIME_THRESHOLD) && (M > PROB_SIZE_THRESHOLD_MB ); |
| } |
| catch (DMLRuntimeException e) |
| { |
| LOG.error("Failed to estimate execution time.", e); |
| } |
| |
| return ret; |
| } |
| |
| } |