org.jikesrvm.adaptive.controller

Class RecompileOptChoice

java.lang.Object

org.jikesrvm.adaptive.controller.RecompilationChoice

org.jikesrvm.adaptive.controller.RecompileOptChoice

class RecompileOptChoice
extends RecompilationChoice

Represents the recompilation choice of simply recompiling the method in question at a particular opt-level. The cost is the expected compilation time at that level, and the benefit is the execution improvement of executing at that level.

Field Summary

Fields

Modifier and Type	Field and Description
private int	thisChoiceCompiler The "compiler" (see CompilerDNA) that is associated with this choice
private int	thisChoiceOptLevel The opt level associated with this recompilation choice

Constructor Summary

Constructors

Constructor and Description
RecompileOptChoice(int level) Constructor

Method Summary

Modifier and Type	Method and Description
(package private) int	getCompiler() Which "compiler" is associated with this choice?
(package private) double	getCost(NormalMethod meth) What is the cost of selecting this recompilation choice?
(package private) double	getFutureExecutionTime(int prevCompiler, double futureTimeForMethod) What is the benefit of executing this recompilation choice, given the estimated future time for the method if nothing changes?
(package private) int	getOptLevel() Which opt-level is associated with this choice?
(package private) ControllerPlan	makeControllerPlan(CompiledMethod cmpMethod, int prevCompiler, double prevTimeForMethod, double bestActionTime, double expectedCompilationTime) Return a controller plan that will start this recompilation choice in action.
String	toString() How should this choice be displayed?

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

thisChoiceOptLevel

private final int thisChoiceOptLevel

The opt level associated with this recompilation choice

thisChoiceCompiler

private final int thisChoiceCompiler

The "compiler" (see CompilerDNA) that is associated with this choice

Constructor Detail

RecompileOptChoice

RecompileOptChoice(int level)

Constructor

Parameters:

level - the opt level associated with this choice

Method Detail

getCost

double getCost(NormalMethod meth)

Description copied from class: RecompilationChoice

What is the cost of selecting this recompilation choice?

Specified by:

getCost in class RecompilationChoice

Parameters:

meth - The method being considered for recompilation.

Returns:

The expected cost of executing this recompilation choice

getFutureExecutionTime

double getFutureExecutionTime(int prevCompiler,
                              double futureTimeForMethod)

Description copied from class: RecompilationChoice

What is the benefit of executing this recompilation choice, given the estimated future time for the method if nothing changes?

Specified by:

getFutureExecutionTime in class RecompilationChoice

Parameters:

prevCompiler - The previous compiler

futureTimeForMethod - The expected future execution time of the method if left running with the previous compiler.

Returns:

The expected future execution time if this choice were selected

makeControllerPlan

ControllerPlan makeControllerPlan(CompiledMethod cmpMethod,
                                  int prevCompiler,
                                  double prevTimeForMethod,
                                  double bestActionTime,
                                  double expectedCompilationTime)

Return a controller plan that will start this recompilation choice in action. In this case, simply create a plan to recompile at level thisChoiceOptLevel.

Specified by:

makeControllerPlan in class RecompilationChoice

Parameters:

cmpMethod - The method in question

prevCompiler - The previous compiler

prevTimeForMethod - The estimated future time had nothing been done

bestActionTime - The estimated total time implementing this choice

expectedCompilationTime - The estimated compilation cost implementing this choice

Returns:

The controller plan implementing this recompilation choice

toString

public String toString()

How should this choice be displayed?

Overrides:

toString in class Object

getOptLevel

int getOptLevel()

Which opt-level is associated with this choice?

Returns:

the opt-level for this choice

getCompiler

int getCompiler()

Which "compiler" is associated with this choice?

Returns:

the integer representing the compiler for this choice

See Also:

CompilerDNA.getCompilerConstant(int)