org.basex.util

Class Performance

java.lang.Object

org.basex.util.Performance

public final class Performance
extends java.lang.Object

This class contains methods for performance measurements.

Author:

BaseX Team 2005-12, BSD License, Christian Gruen

Constructor Summary

Constructors

Constructor and Description
Performance()

Method Summary

Methods

Modifier and Type	Method and Description
static java.lang.String	format(long size) Formats a number according to the binary size orders (KB, MB, ...).
static java.lang.String	format(long size, boolean det) Formats a file size according to the binary size orders (KB, MB, ...).
static void	gc(int n) Performs some garbage collection.
static java.lang.String	getMemory() Returns a formatted representation of the current memory consumption.
java.lang.String	getTime() Returns the measured execution time in milliseconds and reinitializes the timer.
java.lang.String	getTime(int runs) Returns the measured execution time in milliseconds, divided by the number of runs, and reinitializes the timer.
static java.lang.String	getTime(long time, int runs) Returns a string with the measured execution time in milliseconds.
static long	memory() Returns the current memory consumption in bytes.
static void	sleep(long ms) Sleeps the specified number of milliseconds.
long	time() Returns the measured execution time in nanoseconds.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

Performance

public Performance()

Method Detail

time

public long time()

Returns the measured execution time in nanoseconds.

Returns:

execution time

getTime

public java.lang.String getTime()

Returns the measured execution time in milliseconds and reinitializes the timer.

Returns:

execution time

getTime

public java.lang.String getTime(int runs)

Returns the measured execution time in milliseconds, divided by the number of runs, and reinitializes the timer.

Parameters:

runs - number of runs

Returns:

execution time

getTime

public static java.lang.String getTime(long time,
                       int runs)

Returns a string with the measured execution time in milliseconds.

Parameters:

time - measured time in nanoseconds

runs - number of runs

Returns:

execution time

getMemory

public static java.lang.String getMemory()

Returns a formatted representation of the current memory consumption.

Returns:

memory consumption

format

public static java.lang.String format(long size)

Formats a number according to the binary size orders (KB, MB, ...).

Parameters:

size - value to be formatted

Returns:

formatted size value

format

public static java.lang.String format(long size,
                      boolean det)

Formats a file size according to the binary size orders (KB, MB, ...).

Parameters:

size - file size

det - detailed suffix

Returns:

formatted size value

sleep

public static void sleep(long ms)

Sleeps the specified number of milliseconds.

Parameters:

ms - time in milliseconds to wait

gc

public static void gc(int n)

Performs some garbage collection. GC behavior in Java is a pretty complex task. Still, garbage collection can be forced by calling it several times.

Parameters:

n - number of times to execute garbage collection

memory

public static long memory()

Returns the current memory consumption in bytes.

Returns:

memory consumption

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object