CloudSim - Cpu Utilization

Question

Can anyone explain the real difference between these two methods

vm.getTotalUtilizationOfCpu(CloudSim.clock());

and

cloudlet.getUtilizationOfCpu(CloudSim.clock());

Thanks in advance

Answer 1

Here's the difference.

1) vm.getTotalUtilizationOfCpu(CloudSim.clock());

getTotalUtilizationOfCpu is the method of class vm. You can call it by instance of vm class

If you look at the implementation of this method in source code.

public abstract double getTotalUtilizationOfCpu(double time);

    /**
     * Gets the current requested mips.
     * 
     * @return the current mips
     */

It returns the cpu utilization in form of mips

2) cloudlet.getUtilizationOfCpu(CloudSim.clock());

getTotalUtilizationOfCpu is the method of class cloudlet. You can call it by instance of cloudlet class

if you look at the implementation of this method in source code.

/**
     * Gets the utilization percentage of cpu.
     *
     * @param time the time
     * @return the utilization of cpu
     */
    public double getUtilizationOfCpu(final double time) {
        return getUtilizationModelCpu().getUtilization(time);
    }

It returns the cpu utilization in form of percentage (between 0 to 1)