org.apache.giraph.utils

Class GcTracker

java.lang.Object

org.apache.giraph.utils.GcTracker

public class GcTracker
extends Object

Tracks last k GC pauses and is able to tell how much time was spent doing GC since some point in time. Thread safe.

Field Summary

Fields

Modifier and Type	Field and Description
static IntConfOption	LAST_GCS_TO_KEEP How many last gcs to keep

Constructor Summary

Constructors

Constructor and Description
GcTracker() Constructor with default number of last gcs to keep
GcTracker(org.apache.hadoop.conf.Configuration conf) Constructor with configuration

Method Summary

Modifier and Type	Method and Description
void	gcOccurred(com.sun.management.GcInfo gcInfo) Called to notify gc tracker that gc occurred
long	gcTimeSpentSince(long timeSinceJvmStarted) Check how much time was spent doing gc since some timestamp

Methods inherited from class java.lang.Object

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

Field Detail

LAST_GCS_TO_KEEP

public static final IntConfOption LAST_GCS_TO_KEEP

How many last gcs to keep

Constructor Detail

GcTracker

public GcTracker()

Constructor with default number of last gcs to keep

GcTracker

public GcTracker(org.apache.hadoop.conf.Configuration conf)

Constructor with configuration

Parameters:

conf - Configuration

Method Detail

gcOccurred

public void gcOccurred(com.sun.management.GcInfo gcInfo)

Called to notify gc tracker that gc occurred

Parameters:

gcInfo - GC info

gcTimeSpentSince

public long gcTimeSpentSince(long timeSinceJvmStarted)

Check how much time was spent doing gc since some timestamp

Parameters:

timeSinceJvmStarted - Timestamp to measure from, you can use ManagementFactory.getRuntimeMXBean().getUptime() to get it

Returns:

How much time was spent doing gc since that timestamp (if there were more gcs than we are keeping (LAST_GCS_TO_KEEP) then it will be partial result)