CallDensityListener (Jikes RVM API)

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org.jikesrvm.adaptive.measurements.listeners
Class CallDensityListener

java.lang.Object
  org.jikesrvm.adaptive.measurements.listeners.Listener
      org.jikesrvm.adaptive.measurements.listeners.NullListener
          org.jikesrvm.adaptive.measurements.listeners.CallDensityListener

public final class CallDensityListener
extends NullListener
extends NullListener

A simple listener to accumulate counts of total events and the fraction of those events that occured at loop backedges. In effect, this provides a mechanism for estimating the call density of the program. If most yieldpoints are being taken at backedges, then call density is low.

Field Summary
`private double`	`numBackedgeSamples`
`private double`	`numSamples`

Constructor Summary
`CallDensityListener()`

Method Summary
`double`	`callDensity()`
`void`	`report()` Entry point to dump what has been collected.
`void`	`reset()` reset the listeners data structures
`void`	`update(int whereFrom)` This method is called when its time to record that a yield point has occurred.

Methods inherited from class org.jikesrvm.adaptive.measurements.listeners.Listener
`activate, activateOrganizer, isActive, passivate, setOrganizer`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

numSamples

private double numSamples

numBackedgeSamples

private double numBackedgeSamples

Constructor Detail

CallDensityListener

public CallDensityListener()

Method Detail

update

public void update(int whereFrom)

This method is called when its time to record that a yield point has occurred.

Specified by:: update in class NullListener

Parameters:: whereFrom - Was this a yieldpoint in a PROLOGUE, BACKEDGE, or EPILOGUE?

callDensity

public double callDensity()

reset

public void reset()

Description copied from class: Listener

reset the listeners data structures

Specified by:: reset in class Listener

report

public void report()