org.mmtk.vm

Class Statistics

java.lang.Object

org.mmtk.vm.Statistics

Direct Known Subclasses:

Statistics

public abstract class Statistics
extends Object

Constructor Summary

Constructors

Constructor and Description
Statistics()

Method Summary

Modifier and Type	Method and Description
abstract long	cycles() Read the cycle counter
abstract long	millisToNanos(double t) Converts milliseconds to nanoseconds
abstract double	nanosToMillis(long c) Converts nanoseconds to milliseconds
abstract double	nanosToSecs(long c) Converts nanoseconds to seconds
abstract long	nanoTime() Read cycle counter.
abstract void	perfEventInit(String events) Initializes performance events.
abstract void	perfEventRead(int counter, long[] values) Reads a performance event value.
abstract long	secsToNanos(double t) Convert seconds to nanoseconds

Methods inherited from class java.lang.Object

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

Constructor Detail

Statistics

public Statistics()

Method Detail

nanoTime

public abstract long nanoTime()

Read cycle counter. This has the same semantics as System.nanoTime().

Returns:

current time in nanoseconds

nanosToMillis

public abstract double nanosToMillis(long c)

Converts nanoseconds to milliseconds

Parameters:

c - time in nanoseconds

Returns:

time in milliseconds

nanosToSecs

public abstract double nanosToSecs(long c)

Converts nanoseconds to seconds

Parameters:

c - time in nanoseconds

Returns:

time in seconds

millisToNanos

public abstract long millisToNanos(double t)

Converts milliseconds to nanoseconds

Parameters:

t - time in milliseconds

Returns:

time in nanoseconds

secsToNanos

public abstract long secsToNanos(double t)

Convert seconds to nanoseconds

Parameters:

t - time in seconds

Returns:

time in nanoseconds

cycles

public abstract long cycles()

Read the cycle counter

Returns:

number of cycles

perfEventInit

public abstract void perfEventInit(String events)

Initializes performance events.

Parameters:

events - the events to initialize. This is a comma-separated list of event names.

perfEventRead

public abstract void perfEventRead(int counter,
                                   long[] values)

Reads a performance event value.

Parameters:

counter - the event's id

values - a buffer that will hold the return values of the read (3 64-bit values).