org.apache.ignite.internal.visor.igfs

Class VisorIgfsProfilerUniformityCounters

java.lang.Object

org.apache.ignite.internal.visor.igfs.VisorIgfsProfilerUniformityCounters

All Implemented Interfaces:

Serializable, LessNamingBean

public class VisorIgfsProfilerUniformityCounters
extends Object
implements Serializable, LessNamingBean

Class to support uniformity calculation.

Uniformity calculated as coefficient of variation.

Count read frequency for each file and compare with ideal uniform distribution.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
VisorIgfsProfilerUniformityCounters()

Method Summary

Methods

Modifier and Type	Method and Description
void	aggregate(VisorIgfsProfilerUniformityCounters other) Add given counters.
double	calc() Calculate uniformity as standard deviation.
void	increment(long pos, long len) Increment counters by given pos and length.
void	invalidate(long newFileSize) Check if counters and blockSize should be adjusted according to file size.

Methods inherited from class java.lang.Object

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

Constructor Detail

VisorIgfsProfilerUniformityCounters

public VisorIgfsProfilerUniformityCounters()

Method Detail

invalidate

public void invalidate(long newFileSize)

Check if counters and blockSize should be adjusted according to file size.

Parameters:

newFileSize - New size of file.

increment

public void increment(long pos,
             long len)

Increment counters by given pos and length.

Parameters:

pos - Position in file.

len - Read data length.

aggregate

public void aggregate(VisorIgfsProfilerUniformityCounters other)

Add given counters.

Parameters:

other - Counters to add.

calc

public double calc()

Calculate uniformity as standard deviation. See: http://en.wikipedia.org/wiki/Standard_deviation.

Returns:

Uniformity value as number in 0..1 range.