org.apache.hadoop.yarn.util

Class CpuTimeTracker

java.lang.Object

org.apache.hadoop.yarn.util.CpuTimeTracker

@InterfaceAudience.Private
 @InterfaceStability.Unstable
public class CpuTimeTracker
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static int	UNAVAILABLE

Constructor Summary

Constructors

Constructor and Description
CpuTimeTracker(long jiffyLengthInMillis)

Method Summary

Modifier and Type	Method and Description
float	getCpuTrackerUsagePercent() Return percentage of cpu time spent over the time since last update.
String	toString()
void	updateElapsedJiffies(BigInteger elapedJiffies, long sampleTime)

Methods inherited from class java.lang.Object

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

Field Detail

UNAVAILABLE

public static final int UNAVAILABLE

See Also:

Constant Field Values

Constructor Detail

CpuTimeTracker

public CpuTimeTracker(long jiffyLengthInMillis)

Method Detail

getCpuTrackerUsagePercent

public float getCpuTrackerUsagePercent()

Return percentage of cpu time spent over the time since last update. CPU time spent is based on elapsed jiffies multiplied by amount of time for 1 core. Thus, if you use 2 cores completely you would have spent twice the actual time between updates and this will return 200%.

Returns:

Return percentage of cpu usage since last update, UNAVAILABLE if there haven't been 2 updates more than MINIMUM_UPDATE_INTERVAL apart

updateElapsedJiffies

public void updateElapsedJiffies(BigInteger elapedJiffies,
                                 long sampleTime)

toString

public String toString()

Overrides:

toString in class Object