Class SystemLoadMonitor

java.lang.Object

java.util.TimerTask

hudson.triggers.SafeTimerTask

hudson.model.PeriodicWork

hudson.model.AsyncPeriodicWork

io.jenkins.plugins.smartexecutorloadbalancer.SystemLoadMonitor

All Implemented Interfaces:

ExtensionPoint, Runnable

@Extension
public class SystemLoadMonitor
extends AsyncPeriodicWork

Periodically polls the 1-minute system load average from every online node via the remoting channel and caches the result in memory.

SmartLoadBalancer reads this cache synchronously during scheduling so there is no per-schedule I/O.

On Windows agents, getSystemLoadAverage() returns -1 (unsupported). We treat -1 as 0.0 so Windows nodes are not penalised.

Nested Class Summary

Nested classes/interfaces inherited from class SafeTimerTask

SafeTimerTask.ExceptionRunnable

Nested classes/interfaces inherited from interface ExtensionPoint

ExtensionPoint.LegacyInstancesAreScopedToHudson

Field Summary

Fields inherited from class AsyncPeriodicWork

name

Fields inherited from class PeriodicWork

DAY, HOUR, logger, MIN

Constructor Summary

Constructors

Constructor	Description
SystemLoadMonitor()

Method Summary

Modifier and Type	Method	Description
protected void	execute(TaskListener listener)
static double	getLoad(String computerName)	Returns the cached load average for the named computer.
long	getRecurrencePeriod()

Methods inherited from class AsyncPeriodicWork

createListener, doRun, getErrorLoggingLevel, getLogFile, getNormalLoggingLevel, getSlowLoggingLevel, queueIfAlreadyRunning

Methods inherited from class PeriodicWork

all, getInitialDelay, init

Methods inherited from class SafeTimerTask

getLogsRoot, of, run

Methods inherited from class TimerTask

cancel, scheduledExecutionTime

Methods inherited from class Object

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

Constructor Details

SystemLoadMonitor

public SystemLoadMonitor()

Method Details

getRecurrencePeriod

public long getRecurrencePeriod()

Specified by:

getRecurrencePeriod in class PeriodicWork

execute

protected void execute(TaskListener listener)
                throws IOException,
InterruptedException

Specified by:

execute in class AsyncPeriodicWork

Throws:

IOException

InterruptedException

getLoad

public static double getLoad(String computerName)

Returns the cached load average for the named computer. Falls back to 0.0 if no measurement has been taken yet or polling failed.