Package org.apache.sysds.runtime.controlprogram.parfor.opt

Class Optimizer

java.lang.Object

org.apache.sysds.runtime.controlprogram.parfor.opt.Optimizer

Direct Known Subclasses:

OptimizerRuleBased

public abstract class Optimizer
extends Object

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).

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	Optimizer.CostModelType

Method Summary

Modifier and Type	Method	Description
abstract Optimizer.CostModelType	getCostModelType()
long	getNumEvaluatedPlans()
long	getNumTotalPlans()
abstract ParForProgramBlock.POptMode	getOptMode()
abstract boolean	optimize(ParForStatementBlock sb, ParForProgramBlock pb, OptTree plan, CostEstimator est, int numRuns, ExecutionContext ec)	Optimize the parfor statement block

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

optimize

public abstract boolean optimize(ParForStatementBlock sb,
 ParForProgramBlock pb,
 OptTree plan,
 CostEstimator est,
 int numRuns,
 ExecutionContext ec)

Optimize the parfor statement block

Parameters:

sb - parfor statement block

pb - parfor program block

plan - complete plan of a top-level parfor

est - cost estimator

numRuns - Number of runs

ec - execution context

Returns:

true if plan changed, false otherwise

getCostModelType

public abstract Optimizer.CostModelType getCostModelType()

getOptMode

public abstract ParForProgramBlock.POptMode getOptMode()

getNumTotalPlans

public long getNumTotalPlans()

getNumEvaluatedPlans

public long getNumEvaluatedPlans()