be.ac.ua.broker.allocation.reserved
Class TippingPointCalculator

java.lang.Object
  be.ac.ua.broker.allocation.reserved.TippingPointCalculator

public class TippingPointCalculator
extends java.lang.Object

Calculator used during the resource allocation phase of the broker, to determine the tipping point utilization ratio for when reserved is cheaper than using an on-demand instance. It is also used to determine the tipping point utilization ratio for when reserved is cheaper than using a spot instance (uses the average spot price of the schedule period).

Author:

Vermeersch Kurt

Constructor Summary

TippingPointCalculator()

Method Summary

static boolean	determineReservedvsSpot(InstanceSpecification inst, int nrSpotEnabledSubtasks, int nrNonSpotEnabledSubtasks, java.util.Date start, java.util.Date end) Determine the tipping point utilization ratio for when a reserved instance becomes cheaper than using a spot instance.
static long	determineThresholdReservedOnDemand(InstanceSpecification inst) Determine the tipping point utilization ratio for when a reserved instance becomes cheaper than using an on-demand instance.

Methods inherited from class java.lang.Object

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

Constructor Detail

TippingPointCalculator

public TippingPointCalculator()

Method Detail

determineThresholdReservedOnDemand

public static long determineThresholdReservedOnDemand(InstanceSpecification inst)

Determine the tipping point utilization ratio for when a reserved instance becomes cheaper than using an on-demand instance.

Parameters:

inst - the instance specification to determine the threshold value for

Returns:

the tipping for reserved versus on-demand

determineReservedvsSpot

public static boolean determineReservedvsSpot(InstanceSpecification inst,
                                              int nrSpotEnabledSubtasks,
                                              int nrNonSpotEnabledSubtasks,
                                              java.util.Date start,
                                              java.util.Date end)

Determine the tipping point utilization ratio for when a reserved instance becomes cheaper than using a spot instance. Note that in this calculation the average spot price during the whole scheduling period is being used. The number of task hours that are scheduled on the instance that originate from a spot-enabled task and the number of hours from a not spot-enabled task are taken into account as well.

Parameters:

inst - the instance specification to determine the threshold value for

nrSpotEnabledSubtasks - number of task hours scheduled on the instance originating from spot-enabled tasks

nrNonSpotEnabledSubtasks - number of task hours scheduled on the instance originating from not spot-enabled tasks

start - start time of the schedule

end - end time of the schedule

Returns:

the tipping for reserved versus spot