HSO: A Hybrid Swarm Optimization Algorithm for Reducing Energy Consumption in the Cloudlets

TELKOMNIKA, Vol.16, No.5, October 2018, pp.2144~2154
ISSN: 1693-6930, accredited First Grade by Kemenristekdikti, Decree No: 21/E/KPT/2018
DOI: 10.12928/TELKOMNIKA.v16i5.9415  2144
Received March 27, 2018; Revised August 12, 2018; Accepted September 9, 2018
HSO: A Hybrid Swarm Optimization Algorithm for
Reducing Energy Consumption in the Cloudlets
Raed A. Hasan
*1
, Mostafa A. Mohammed
2
, Zeyad Hussein Salih
3
,
Mohammed Ariff Bin Ameedeen
4
, Nicolae Ţăpuş
5
, Muamer N. Mohammed
6
1,4,6
Faculty of Computer System and software Engineering, University Malaysia Pahang,
Kuantan-26300, Pahang, Malaysia,Tel: +609-4245000, Fax: +609-4245055
2,5
Faculty of Automatic Control and Computers,University Politechnica of Bucharest,
313 Splaiul Independenței, 060042, Romania, Tel: +40 21 402 9100
3
Faculty of petroleum and minerals engineering| Tikrit University, Tikrit-34001, Iraq
*Corresponding author, e-mail: raed.isc.sa@gmail.com
Abstract
Mobile Cloud Computing (MCC) is an emerging technology for the improvement of mobile
service quality. MCC resources are dynamically allocated to the users who pay for the resources based on
their needs. The drawback of this process is that it is prone to failure and demands a high energy input.
Resource providers mainly focus on resource performance and utilization with more consideration on the
constraints of service level agreement (SLA). Resource performance can be achieved through
virtualization techniques which facilitates the sharing of resource providers’ information between different
virtual machines. To address these issues, this study sets forth a novel algorithm (HSO) that optimized
energy efficiency resource management in the cloud; the process of the proposed method involves the use
of the developed cost and runtime-effective model to create a minimum energy configuration of the cloud
compute nodes while guaranteeing the maintenance of all minimum performances. The cost functions will
cover energy, performance and reliability concerns. With the proposed model, the performance of the
Hybrid swarm algorithm was significantly increased, as observed by optimizing the number of tasks
through simulation, (power consumption was reduced by 42%). The simulation studies also showed a
reduction in the number of required calculations by about 20% by the inclusion of the presented algorithms
compared to the traditional static approach. There was also a decrease in the node loss which allowed the
optimization algorithm to achieve a minimal overhead on cloud compute resources while still saving energy
significantly. Conclusively, an energy-aware optimization model which describes the required system
constraints was presented in this study, and a further proposal for techniques to determine the best overall
solution was also made.
Keywords: mobile cloud computing, energy optimization, resource management, reliability
Copyright © 2018 Universitas Ahmad Dahlan. All rights reserved.
1. Introduction
Cloud computing has made significant progress toward fulfilling the promise of
computer accessibility for everyone. In this study, an energy optimization model for the
computing nodes which incorporates the cloud computing systems is proposed. The work is
based on the premise that the computing nodes should be active and consume power only
when there is a work to be processed, otherwise should remain inactive [1]. Different
approaches such as a neural network, fuzzy logic inference engine, and linear filters will be
used to determine future workloads while the workloads and the simulated potential energy
savings will be predicted using single and multi-tenant models of hosting cloud systems. With
these, this study will present a minimized cost optimization model which will predict incoming
workloads, determine the optimal system configuration, and make the necessary changes [2].
The optimizer, with the aid of the developed cost model and runtime constraints, will
generate the minimum energy configuration of cloud computing nodes while ensuring that the
performance is guaranteed. The three key areas of energy, performance, and reliability will be
covered by the cost functions [3-5]. A decrease in the number of active servers was evidenced
through simulation to have reduced power consumption by 42 %. Also, the simulation study
showed that the inclusion of the suggested algorithms reduced the required number of
calculations by over 20% when compared to the conventional static method. This ensured the

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HSO: A Hybrid Swarm Optimization Algorithm for Reducing Energy .... (Raed A. Hasan)
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attainment of a minimal overhead on the cloud resources by the optimization algorithm, while
saving energy substantially. An overall energy-aware optimization model which described the
required system constraints and proposed the techniques for the determination of the best
overall solution was proposed.
Figure 1. Shows level as Cloudlet, Local cloud and Public cloud (S. Rashidi, S. Sharifian.2017)
The main challenges of MCC are as following:
Automated service provisioning
Virtual Machines Migration
Energy Management
Stored data management
Emergence of small data centres for cloud computing
The main reason behind focusing on energy efficiency is due to the increase in the
energy cost spent on data centers. One of the major contributor to the increased energy cost is
the server machine. It contributed significantly to increased energy utilization due to the direct
power consumption of the cooling gadgets used in it. About 75% of the energy cost in the data
center is accounted for by the direct and indirect power consumed by the server machine and
cooling equipment, respectively. Furthermore, the high-performance multi-core processors used
in the server machine contributes to the increased demand for power, as well as the dissipation
of a considerable amount of heat.
The following works have already been contributed:
1. “Proposal of a new Hybrid algorithm named (HSO) using ACO and PSO search”.
2. “Analysis of job creation time, task creation time, destruction time, result retrieval time and
total time for HSO algorithm”.
3. “Performance comparison of an HSO algorithm and CSO algorithms”.
4. “Makespan improvement comparison of an HSO algorithm with CSO & ABC algorithms”.
5. “Energy comparison of HSO algorithm and Cuckoo algorithm”.
This research is organized into sections, section 1 is a preface where the problem and
the most important goals have been defined. The second section went through the studies
related to the problem and discussed their strengths and weaknesses. The third section
provided a brief discussion of the suggested methodology, a diagram, and a mathematical
equation, and the fourth section discussed the results and their comparison to the existing
algorithms. The last part is a conclusion.
2. Related Works
Many solutions to the VM placement problem in the cloud have been presented in the
research literature. Most implement some form of the utility function, which manages certain
aspects of the cloud. The use of VM live migration to consolidate VMs onto PMs is a common

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approach. Most of the solutions implement some form of prediction algorithm in order to have an
idea of how much capacity is required in the future. Almost all approaches involve some form of
AI heuristic since the problem of VM placement is recognized to be generally NP-Hard [6,7].
2.1. Swarm Intelligence SI
SI describes a new field of optimization methods inspired by the natural behavior of
swarm insects such as ants, birds, bees and many more. Such a behavior is exploited with
simple rules and embedded in a metaheuristic solution approach. The bottom line of a
metaheuristic procedure is the iterative quality improvement of initial (sometimes random)
candidate solutions. The combination of simple rules, within a metaheuristic, enables them to
tackle combinatorial problems. Some of those are non-deterministic polynomial-time hard
problems (NP-hard).
Reported research and practice results for those techniques encouraged researchers
for a steady intensification and extension for the field of swarm intelligence and
metaheuristics [7,8]. The history of metaheuristics and swarm intelligence is very much
intertwined. Among the first and highly acknowledged metaheuristics are Genetic Algorithms
(GA) [9,10], Simulated Annealing (SA) [11] and Tabu Search (TS) [12]. These are classified as
metaheuristics, such as SI. Regarding the SI, the most important SI techniques are the Ant
Colony Optimization (ACO) [13] and Particle Swarm Optimization (PSO) [14-17].
2.2. Swarm Intelligence used for VM placement.
An energy-efficiency evaluation model with two influencing factors (CPU and GPU
utilization rates) has been proposed by Jiang, Feng, Zhao, & Li (2017) after studying the energy
and performance constrained VM scheduling with data-intensive jobs. To optimize the VM
selection and allocation policies, the developed an artificial bee colony algorithm and conducted
several simulation studies to validate the analytical results [7].
Ghasemi-Falavarjani et al. (2014) suggested a two-stage approach for solving the
problem: the first used a non-dominated Sorting Genetic Algorithm II (NSGA-II) to generate the
Pareto solution set before employing entropy weight plus Technique for Order Preference by
Similarity to Ideal Solution (TOPSIS) technique to determine the optimal compromise solution.
However, a context-aware offloading middleware was enhanced for contextual information
collection and handling of the offloading procedure [18,19]. As a core cloud computing
technique, the VM is regarded as an efficient method towards building a cloud-based data
center to ensure green computing as suggested by Aksanli et al. (2012).
Gai et al. (2016) attempted an extension of the functions of cloudlets and later used a
dynamic energy-aware cloudlet-based mobile cloud computing model (DECM) to further
investigate their energy-aware performances in the dynamic networking environment [4].
Ranjbari & Torkestani (2017) suggested a power and SLA efficient algorithm for resource
allocation through the optimization of the energy utilization, SLA violations, and the number of
VM migrations. In their study, the environment parameters were adapted using Learning
Automata to prevent a violation of the SLA and avoid physical machine overload [20].
2.3. Hybrid swarm algorithms used in a cloud environment
Mashayekhy et al. (2015) provided the model of a heterogeneous VM provisioning
problem as a coalitional game and suggested a core-based pricing method which achieved an
optimal solution. The proposed method ensured an optimal social welfare without considering
the proofs of the strategy [8]. Mohammed & Tapus (2017) emphasized on efficient resource
management with a focus on minimal energy absorption by using enthalpy-based CSO
frameworks. They developed and resolved the resource management problems in this study. As
such, different effective measures were formulated for each task, and regarding the computed
enthalpy values, the CSO was used to optimally prioritize the resources [21].
The ABC was proposed by Goudarzi et al. (2017) as a fast hybrid multi-site computation
offloading solution which establishes the offloading solution in a time-efficient manner. The
provided solutions which include 2 decision algorithms for achieving optimal or near-optimal
solutions for multi-site offloading with regard to the size of the application. The heterogeneity of
a system has an important role in the determination of the dynamics of strategy-proof
mechanisms [5]. Our paper presents a Hybrid Swarm Optimization (HSO) algorithm which

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initiates with a PSO, and if the PSO failed to find the global optima, then, the ACO will strive to
address the drawbacks of PSO.
3. Proposed Methodology
3.1. Resource allocation
This resource allocation is the procedure toward doling out and scheduling accessible
resources in a most effective and economical manner. The suggested optimized HSO,
accompanied by ACO and PSO solves the resources allocation problems and results in an
effective resource management. In the mobile cloud computing, resource management is
imperative in computing resource distribution between the customers. An efficient resource
management in a data-center has its part for both consumer satisfaction and maximizing profit.
The suggested HSO, along with the energy-aware model, aids cloud administrators in
the direction of choosing the priority among the clients and dispense resources effectively. This
suggested resource allocation procedure is more efficient to that of the existing methods
because, in those frameworks, there is no consideration of load balancing over and above
energy reduction amongst the tasks. The solutions presented will potentially allow the operator
of a cloud to automatically reconfigure the computer resources of the cloud in such a way as to
minimize the overall energy consumption of the resources and at the same time, maintaining the
performance and reliability concerns of the cloud operator.
3.2. Low Energy Optimization
A presentation of the full cost model was made relating to the areas of energy,
performance, and reliability. Each area was examined and an in-depth cost model relating to all
the variables and constraints (comprising the specific areas) was presented. The cost model
was followed by an explanation and mathematical summary of the required operational
constraints around the cost functions. Lastly, an optimization model was presented using
genetic algorithms. A process flow diagram was presented which described the overall
optimization algorithm.
The algorithm comprised of the workload prediction, grouping, and sorting the VMs and
PMs into the category lists of VM source candidates, VM target candidates, and PM sleep
candidates. Next, the lists were used to create an initial configuration of an insect. The insect is
passed into the cost model for overall cost determination. The HSO algorithm then mutates the
PM and VM lists, then, the processes are repeated. When the delta minimum cost is within a
target epsilon value or a maximum number of iterations is reached, the algorithm exits, and the
minimum cost configuration is passed into the reconfiguration process for the modification of the
runtime configuration. The HSO algorithm mutates the three lists by randomly rearranging the
ordering of the systems and the process is repeated until the target cost threshold is reached.
Figure 2 showed the process flow diagram of the low energy optimization model implementing
the HSO heuristic described in this section.
Figure 2. Low Energy Optimization Model Process Flow Diagram

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3.3. The metaheuristic search (ACO & PSO) algorithms
The essential parts of an ant algorithm are the ants’ solution construction and the
pheromone update. Even if denoted as optional, an LS procedure is implemented in almost
every metaheuristic ACO algorithm. The ACO metaheuristic algorithm is described in three
basic steps. Reviewing the characteristics for ACO, it becomes obvious that artificial ants build
solutions out of a finite set of possible partial solutions [5,22]. The starting point is an empty
partial solution, which is extended to a feasible solution for each iteration step. The probability
for choosing a solution component (or the next node) relates to the probabilistic path search
behavior. This feasible solution is defined as a set of available solutions which must fulfill certain
constraints.
The PSO was inspired by the natural swarm behavior of birds [21,23]. It has several
advantages for solving computational tasks. When compared to the other known frameworks,
the PSO is a simple concept which can be easily implemented though with a considerable level
of complexity in handling several optimization tasks. Regarding competitiveness, the PSO is
computationally cost-effective and fast enough. Considering the PSO algorithm, position and
velocity computation resemble the basic PSO algorithm. The position calculation is smoothed by
an additional velocity factor [24,25]; that is, a factor is activated in case the average swarm
velocity is higher than the maximum velocity. A comparison to the basic PSO and PSO
modifications proves HSO outperformed the known methods. Particularly, while grouping and
exchanging prove to work against premature convergence, the relocation approach does not
seem to have an impact on the solution quality. A drawback remains that they often tend to lead
to suboptimal solutions; hence, a combination with an improved algorithm is considered to
provide higher quality solutions [26,27].
3.4. Derivation of the Energy Cost Function
In this section, many sources of energy consumption in cloudlets were reviewed.
The first is related to the number and state of all the PMs for the time duration under
consideration. The PMs in the active state consume power in a linear model [18,20]. When the
PMs are in the ACTIVE state but are not being utilized, the PMs can still consume 50% of peak
power. Alternatively, when the PMs are placed in the SLEEP state, power consumption drops to
10-15% of peak power [27]. This illustrates the necessity of keeping as many PMs as possible
in the SLEEP state in order to minimize the power consumed by the cloudlet [15]. A linearized
model for power consumption was presented and used in this paper to relate PM power
consumption to PM CPU utilization and is shown below.
(1)
P=Active power is related to a constant, k times the current CPU utilization plus the idle power
of the system, k = Relative weighting constant for cost function. In practice, the constant k is
determined for each unique class of servers through observations prior to the server class being
placed in the cloudlet. This gives the total power for active PMs and the total power for the
inactive as:
∑ [ ( ) ] (2)
∑ ( ) (3)
We can now calculate the watt-hours for running the cloudlet nodes during the current time
period as:
( ) ( ) (4)
where ρ$ is the relative cost of power in $/watt-hours delivered to the PMs for the current time
period, P=set of PMs in current scope, U=utilization function, =cost function, k=relative
weighting constant for cost function, X=configuration of PMs and VMs in the Cloudlet.
The thermal effect of the position of the active PMs in the Cloudlet is to potentially
cause thermal gradients to form where PMs are clustered. When areas of the Cloudlet have

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large thermal gradients, the cooling equipment tasked with dissipating the thermal energy
operates less efficiently than if there are little or no gradients. Each PM in the Cloudlet monitors
the temperature in its case and has the knowledge of the xyz coordinates for each PM which is
kept by the cloud controller. This allows the temperature gradient to be found for each PM in the
Cloudlet. This is then used to determine the cost for the gradient as shown below.
( ) ∑ ( ) (5)
This gives the overall cost function for energy πTHERM=cost factor for thermal
gradients. We include a cost weighting constant κ for each cost function. We derive this
constant to allow the Cloudlet operator to tune the cost functions as appropriate for the needs of
each Cloudlet.
( ) ( ) ( ) (6)
=Cost function, k=relative weighting constant for cost function.
3.5. Hybrid Swarm Optimization
A hybrid algorithm was built by combining the advantages of the ACO and PSO for
solving combinatorial optimization problems. Despite the avalanche of efforts already made for
a competitive QAP solution method, other metaheuristics have shown superiority and
robustness over the ACO [25]. Therefore, this study focused on the building of a Hybrid Swarm
Optimization (HSO) framework and according to the presented metaheuristic design, the HSO
can work together with other frameworks like PSO or ACO.
The extension of the Cuckoo Search Optimization (CSO) has always been conceived
just to compensate its drawbacks (computation time and solution quality) with other frameworks.
Recall that exploration and exploitation are two important attributes for a competitive
optimization algorithm performance [13,16]. Figure 3 shows the flowchart of the HSO algorithm.
The PSO takes the initial value of the polutions as size = 5050. Each insect has two properties,
velocity, and position. Many iteration PSO finds the global optima while ACO enhances the
cloudlet database and works to solve the drawbacks of PSO in getting the highest rate of
service with an optimized energy efficiency and resource management.
Figure 3. Flow chart of HSO algorithm

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4. Results
4.1. Performance analysis
In this section, the performance of HSO was analyzed using various measures such as
reduced energy consumption. The suggested HSO was used in a JAVA platform. Node loss and
benchmarking with the prevailing methodologies were also evaluated. The performance of the
proposed method is presented in Figures 3 to 7 and are described below.
4.1.1. Energy Consumption
The energy loss lossE in a network can be determined through a multiplication of the
energy loss factor with the load losses at the peak load and period T; then, adding the obtained
value to the no-load losses over the same period. It can be calculated using equation (7); The
number of active servers is reduced.
lossloadnopeaklossloadloss PTPTFE 
(7)
where lossE
is the energy loss, F is the loss factor, T is the time period, peaklossloadP
is the load
losses at peak load, lossloadnoP
is the no-load losses.
The nodal energy consumption was mainly computed to avoid delays in the
performance of the nodes, conserve energy, and minimize cost. At an idle nodal state, power is
released and the remaining energy for the packets and the calculations denotes the power
spent in the computations which took place within the routing nodes and power tunings.
Equation 8 is used to determine the energy consumed by a node over time t.
BNANE RTtc **)( 
(8)
where )(tcE
represents the absorbed energy by the node after time t, TN and RN
represents the
number of transmitted and received packets respectively by the node, A and B are constant
factors based on the energy model. Figure 4 showed the comparison graph of the proposed
HSO energy losses with that of ABO and CSO.
Figure 4. Comparative analysis of the suggested HSO with ABC and CSO for energy loss

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4.1.2. Node loss
The only sign of a nodal failure in a network is the integration loss to the nodal
processes witnessed by the other nodes [28]. Thus, nodes are considered failed when a
significant component of their membership is lost. This means that while a node that caused the
primary feature may not be any more, however, it is not succeeded. The node loss of the
proposed framework with respect to different iteration numbers is presented in Figure 5.
Figure 5. The graphical illustration of node loss by varying the iterations
4.1.3. Reliability Considerations for Optimal Cloud Computing
Reliability in Could due to repeated on-off cycles in a utility model is also considered as
a benefit of the energy savings received by switching the unused PMs off. A utility function
model [29] RACE has been presented which considers the MTTF, thermal effects on hardware,
the cost of VM migration, and PM state. The system mitigates SLA violations based on the
allocated capacity being less than the required capacity. Equation (9) is used to measure the
cost of reliability. A reliability-aware server consolidation strategy focuses on characterizing and
analyzing the afore-mentioned problem as a multi-objective optimization problem. Based on the
utility model that was designed for the unification of the multiple constraints on the performance
of SLAs, the reliability factors, and the energy cost, we have shown in Figure 5 the graph of the
proposed HSO reliability.
( ) ( ) ( ) (9)
Where is the cost function, SW = switching, TC = thermal cycling.
4.1.4. Task Energy Consumption
Energy consumption is defined as the quantity of energy utilized by the strategy in data
transfer. The task of energy consumption stands as the quantity of energy utilized to accomplish
each task. The total quantity of energy utilized by a methodology in data transfer is termed the
energy consumption. To do the performance breakdown of the study, the suggested HSO was
compared with the existing CSO. The correlation analysis of the proposed HSO with the existing
CSO is presented in Figure 6, while a comparison of the suggested HSO with CSO for energy
consumption is presented in Figure 7 which demonstrates that the projected HSO achieved less
energy consumption compared to the CSO as the number of task increases.

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Figure 6. The graphical illustration of Reliability Figure 7. Comparison of the proposed HSO
and CSO in terms of energy loss
4.1.5. Execution time
Execution time is the time taken from the start of the first task to the final task taken. It
can be estimated using equation (10).
lastfirstt RRE 
(10)
where tE
is the execution time span, firstR
is the time of ending the last task, lastR
is the time of
starting the first task. The contrast analysis of HSO, CSO, ABC, and GA algorithms in terms of
execution time is shown in Figure 8.
Figure 8. Comparison of HSO, ABC, GA, and CSO in terms of execution time
5. Conclusion
This paper proposed a mobility-aware resource allocation algorithm named as a hybrid
swarm optimization algorithm (HSO) for the reduction of energy consumption. The work of
balancing the workload among the cloudlets is another significant direction in the research for

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MCC. In reality, multiple cloudlets can be set up separately in one huge venue with a high
speed wired network connection among them.
The HSO algorithm optimally prioritized the resources; it requires less computing time
compared to CSO algorithm. From the system model point of view, the requests of using cloud
resource can be classified to the ones from both mobile users nearby and other neighbor
clusters. The gains of accepting a request from a neighbor cloudlet should be balanced with the
cost of increasing the systems’ capacity and the cost of transferring the computing task between
clusters at the same time. Lastly, the cost function of the HSO was addressed in three parts
(energy, performance, and reliability) while its performance was compared to those of CSO and
ABC algorithms.
6. Significance Statements
Proposal of a novel hybrid algorithm called HSO using ACO and PSO; Analysis of job
and task creation time, destruction time, result retrieval time, and total time for executing the
HSO. However, the limitations of wireless bandwidth and device capacity have caused various
bottlenecks such as extra energy consumption and latency delay. Performance comparison of
HSO and CSO algorithms; Makespan improvement comparison of HSO, CSO, and ABC
algorithms; Energy comparison of HSO and CSO algorithms.
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HSO: A Hybrid Swarm Optimization Algorithm for Reducing Energy Consumption in the Cloudlets