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package org.cloudbus.cloudsim.power.models;

import org.cloudbus.cloudsim.power.PowerMeasurement;

import java.util.List;
import java.util.Objects;

/**
 * A power model created based on data from
 * SPEC power benchmark.
 *
 * 

If you are using any algorithms, policies or workload included in the power package please cite * the following paper:

* * * * @author Anton Beloglazov * @since CloudSim Plus 6.0.0 */ public class PowerModelHostSpec extends PowerModelHost { /** * Since {@link #powerSpec} represents the power consumption data * according to CPU utilization, as shorter the size of such a List, * less accurate is the power consumption according to CPU utilization. * Check mentioned attribute for details. * Less than 2 entries doesn't make any sense, * since for any CPU utilization, the power consumption will be the same. */ public static final int MIN_POWER_CONSUMPTION_DATA_SIZE = 2; /** * A List where each element represents the * power consumption (in Watts) of the entity for specific * CPU utilization percentage. * If the list has 10 items, each element represents * the power consumption for 10% of CPU utilization. * This way, the 1st item represents the power consumption for 10% of CPU utilization, * the 2nd for 20% of CPU utilization and so on. * If the list has 100 itens, each item represents the power consumption for 1% of * CPU utilization and so no. */ private final List powerSpec; /** * Instantiates a PowerModelHostSpec providing * the power consumption data of the entity for different * CPU utilization percentages. * * @param powerSpec a list where each element represents the * power consumption (in Watts) of the entity for specific * CPU utilization percentage. * If the list has 10 items, each element represents * the power consumption for 10% of CPU utilization. * This way, the 1st item represents the power consumption for 10% of CPU utilization, * the 2nd for 20% of CPU utilization and so on. * If the list has 100 itens, each item represents the power consumption for 1% of * CPU utilization and so no. * *

If there are 100 elements in this list, * element at position 1 represents the power consumption * for 1% of CPU utilization, where element 100,

* represents power consumption for 100% of CPU utilization. * *

If there are only 10 elements in this list, * each element represents the power consumption * when the CPU utilization is between an interval between [p .. p+10], * where p is the CPU utilization percentage. * For instance, element 0 represents the power consumption * when CPU utilization is between [0 .. 10%].

*/ public PowerModelHostSpec(final List powerSpec) { super(); Objects.requireNonNull(powerSpec, "powerSpec cannot be null"); if (powerSpec.size() >= MIN_POWER_CONSUMPTION_DATA_SIZE) { this.powerSpec = powerSpec; return; } final var msg = "powerSpec has to contain at least %d elements (representing utilization at 0%% and 100%% load, respectively)" .formatted(MIN_POWER_CONSUMPTION_DATA_SIZE); throw new IllegalArgumentException(msg); } @Override public PowerMeasurement getPowerMeasurement() { final double utilizationFraction = getHost().getCpuMipsUtilization() / getHost().getTotalMipsCapacity(); final int utilizationIndex = (int) Math.round(utilizationFraction * powerSpec.size()); final double powerUsage = powerSpec.get(utilizationIndex); return new PowerMeasurement(powerSpec.get(0), powerUsage - powerSpec.get(0)); } @Override public double getPower(final double utilizationFraction) throws IllegalArgumentException { final int utilizationIndex = (int) Math.round(utilizationFraction * powerSpec.size()); return powerSpec.get(utilizationIndex); } }




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