Fault-Tolerance Aware Multi Objective Scheduling Algorithm for Task Scheduling in Computational Grid

David C. Wyld et al. (Eds) : ACITY, DPPR, VLSI, WiMNET, AIAA, CNDC - 2015
pp. 75–80, 2015. © CS & IT-CSCP 2015 DOI : 10.5121/csit.2015.51307
FAULT-TOLERANCE AWARE MULTI
OBJECTIVE SCHEDULING ALGORITHM
FOR TASK SCHEDULING IN
COMPUTATIONAL GRID
Dinesh Prasad Sahu1
, Karan Singh2
and Shiv Prakash3
1,2
School of Computer and Systems Sciences,
Jawaharlal Nehru University, New Delhi-110067, India
1
dinesh.sahu1230@gmail.com, 2
karan@jnu.ac.in
3
Department of Chemical Engineering,
Indian Institute of Technology, Delhi-110 016, India
3
shivprakash@chemical.iitd.ac.in
ABSTRACT
Computational Grid (CG) creates a large heterogeneous and distributed paradigm to manage
and execute the applications which are computationally intensive. In grid scheduling tasks are
assigned to the proper processors in the grid system to for its execution by considering the
execution policy and the optimization objectives. In this paper, makespan and the fault-
tolerance of the computational nodes of the grid which are the two important parameters for the
task execution, are considered and tried to optimize it. As the grid scheduling is considered to
be NP-Hard, so a meta-heuristics evolutionary based techniques are often used to find a
solution for this. We have proposed a NSGA II for this purpose. The performance estimation of
the proposed Fault tolerance Aware NSGA II (FTNSGA II) has been done by writing program
in Matlab. The simulation results evaluates the performance of the all proposed algorithm and
the results of proposed model is compared with existing model Min-Min and Max-Min
algorithm which proves effectiveness of the model.
KEYWORDS
Computational Grid, Scheduling, NSGA II, Idle Time, MS, Fault-tolerance
1. INTRODUCTION
Primarily goal of computational grid (CG) is to fulfill the computational need of the tasks [1].
The computational grid [1] is combination of software and hardware infrastructure that facilitate
right to use to enormous computational capabilities. The enormous computational capabilities are
dependable, reliable, pervasive, and inexpensive even though the users and resources are
geographically distributed. The fault tolerance is important parameter in terms of environment
and cost. The tasks are migrated from idle nodes to busy nodes so that idle nodes operate in
recoverable mode. There may be some nodes in grid which are idle and some which are busy.

76 Computer Science & Information Technology (CS & IT)
The challenging issue in computational grid is fault tolerance consumption due to cost and
ecological problem [1]. The fault tolerance consumption based scheduling is key issue in this
decade, by taking care of fault tolerance consumption. In order to decrease the fault tolerance
consumption, the nodes in the grid have different computing power. Faster computing power of
the nodes permits less time for task execution, but they consume much higher power. In fault
tolerance -aware scheduling fault tolerance consuming at nodes is minimized during the task
execution. In this paper, we explore Makespan (MS) and fault tolerance scheduling algorithm by
using NSGA II for grid on a set of nodes. The organization of the work is as follows: The related
work has been briefed in section 2 and the problem of the system has been described in section 3
and the proposed model is discussed in section 4. Experimental evaluation with respective
observation is depicted in section 5 and finally conclusion is made in section 6.
2. RELATED WORK
Makespan, fault tolerance, turnaround time, availability, reliability etc. are some of the important
parameters that are often optimized by scheduling the jobs appropriately on the grid nodes. The
grid scheduling problem has been broadly deliberated in literature [1, 2, 7, 8]. Genetic Algorithm
(GA) is highly used to find the solution of scheduling problem of CG, as the problem is NP-Hard
[1, 17, 18, 19, 20, 21, 22]. Taking the effect of IPC into consideration, [9] uses GA for solving
the problem of independent task scheduling in computational grid (CG). In [10], in place of a
single, more than one task has been considered for allocation with load consideration using GA
focusing on minimization of turnaround time in distributed computing systems. In [10], Load
balancing, which is also to be taken care of and is an NP Hard problem, has been widely
discussed in [26]. Load balancing on the grid nodes that uses GA has been elaborated in [11].
Both these paper considers load distribution and load variation among the nodes in CG. In [12],
fault tolerance aware scheduling for independent tasks using GA is discussed. In this paper we
modify the work of [12] by incorporating dependencies between tasks. The effectiveness of the
model is studied by comparing with Min-Min, Max-Min. Another important parameter, security
also find place in many papers. Security aware scheduling in computational grid (CG) is
discussed in [22] with focus on security optimization. Parameter availability is discussed in [13]
that demonstrate the availability metric [13], deals with the availability maximization for task
scheduling problem of computational grid using GA.
3. THE PROPOSED MODEL
The proposed model, that considers MS optimization in computational grid, has been discussed
as follows.
3.1 Fitness Function
Fitness function is derived using Queuing Theory [9, 26].
Then the MS can be compute by equation 3 as it is the maximum time taken for execution by the
latest task.

Computer Science & Information Technology (CS & IT) 77
)3(
1
)(
max
1
1
−−−−−−−−−−−−−














××





+
−
= ∑=
=
r
j
jji
iiii
i
m
i
NOIMS δ
µλµµ
λ
Consider a physical nodes of Computational Grid (CG), ܰ is number of CG nodes. For
computational simplicity, the nodes are assumed to be connected to each other following mess
topology. The CG offers virtual connections various virtual are mapped to the CG. Let, The
number of paths from ܵ to ‫ܦ‬using the total number of path of equation (1), the maximization
function for Fault Tolerance (FT) can be expressed as
‫݁ݖ݅݉݅ݔܽܯ‬ ܰ‫݁ݖ݈݅ܽ݉ݎ݋‬ ‫ܶܨ‬ = max௜ୀଵ,ଶ,…,ே೛(‫ܨ‬௜
௣௔௧௛
)/∑ ‫ܨ‬௜
௣௔௧௛௡೛
௜ୀଵ (5)
where, ‫ܨ‬௜
௣௔௧௛
represents fault tolerance of ݅௧௛
path from ܵ to ‫.ܦ‬
The major components of the original NSGA-II are modified to adjust them into the framework
of the optimization problem. The modified components are described below.
Minimize MS with MS≤ MUMS (6)
Maximize Normalize FT<=1 (7)
The proposed work is a multi-objective optimization problem where the required objectives are
maximizing the fault tolerance and minimizing the MS achieved for tasks in CG. Multi-objective
optimization is an important decision to find solutions of good quality. Since the conflicting
complex nature of CG the multi-criteria makes optimization process complicated. An
evolutionary algorithm is NSGA-II, which uses Pareto based evaluation with the capability to
find several Pareto-optimal solutions in single iteration of simulation. Optimal fault tolerance of
this paper is based on NSGA-II. Initial population is randomly generated and sorted according to
fitness and the best half population is selected. The algorithm of NSGA-II is as follows [27]:
Step 1: A random population is initialized.
Step 2: Objective functions for all objectives and constraint are evaluated using equation 3 and 7.
Step 3: Front ranking of the population is done based on the dominance criteria.
Step 4: Crowding distance is calculated.
Step 5: Selection is performed using crowded binary tournament selection operator.
Step 6: Crossover and mutation operators are applied to generate an offspring population.
Step 7: Parent and offspring populations are combined and a non-dominated sorting is done.
Step 8: The parent population is replaced by the best members of the combined population.
In Step 3, each solution is assigned a non-domination rank (a smaller rank to a better non-
dominated front). In Step 4, for each ith
solution of a particular front, density of solutions in its
surrounding is estimated by taking average distance of two solutions on its either side along each
of the objective [27]. This average distance is called the crowding distance. Selection is done
based on the front rank of an individual and for solutions having same front rank, selection is
done on the basis of their crowding distances (larger, the better)

3. EXPERIMENTAL EVALUATIONS AND RESULT
The proposed model is evaluated in this section by performing experimentations. The size of the
input data set affects the convergence of the solution. The experiments are performed by writing
the programs in Matlab version 9.0 and Java and integrated with Gridsim [4] to evaluate the
performance on the system 500 GB secondary memory and 4 GB primary memory respectively.
Simulation environment uses a random generator between the given ranges with uniform
distribution. The following simulation parameters have been used in the experimentations. Input
Parameter Values the Number of nodes 16-1000, Number of tasks 50-14000, Range of arrival
Rate 1-100 MIPS, Range of task Size 2000-5000 MI and Range of processing speed 101-200
MIPS. Figure 4 contains these parameters and their values.
The performance evaluation is conducted for analysing FAGA (fault tolerance aware genetic
algorithm) in the grid. The grid sizes are small (3 to 32 nodes and 10 to 512 tasks), medium (33
to 64 nodes and 513 to 1024 tasks), and large (65 to 128 nodes and 1025 to 2048 tasks. Figure 5
contains the type of grid and corresponding size in terms of the number of nodes and number of
tasks. Normal distribution is used to randomly generate the capacity of the resources and the
workload of tasks. It is expected that all submitted tasks to the system must be scheduled and all
nodes of the system can be used. Above parameters are also used in [4, 12, 14].
For MS minimization minimize MS is taken as fitness which is discussed in [9]. For fault
tolerance maximization we minimize TE is taken as fitness function. We run the simulation setup
up-to 30 iterations and then average is taken for each result shown in this work.
Table 1. Makespan and tolerance by NSGA II
4. CONCLUSIONS
A huge number of developments has been introduced in Grid Computing in recent few years.
Still, being an extremely heterogeneous system, grid poses a number of constraints. The research
in the area of grid computing especially resource scheduling is going on. This work focuses on
the proposal of scheduling in CG with emphasizing on the MS, and fault tolerance optimization
using a NSGA II technique. NSGA II, a meta-heuristic, is a well-known procedure for solving
complex multi-objective optimization problem. Performance of the proposed NSGA II method
has been studied by carrying out the number of experiments and it is found that it performs well.
Also, its comparative study with NSGA II model shows that it has an edge over Min-Min and
Max-Min algorithms. The effectiveness of the model is also studies with scaled input and found
that model is performing better than both Min-Min and Max-Min algorithms.

Computer Science & Information Technology (CS & IT) 79
ACKNOWLEDGEMENTS
I would like to thank my guide Dr. Karan Singh for his kind suggestions and guidance. I like to
thank Dr. Shiv Prakash for his help and guidance in this paper.
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AUTHORS
Dinesh Prasad Sahu received the Master degree (Computer Science &
Application) M.Tech (Computer Science & Application) from Jawaharlal Nehru
University, New Delhi, India. Currently, He is doing Ph.D. (Computer Science &
Engineering) under the guidance of Dr. Karan Singh, from Jawaharlal Nehru
University, New Delhi, India. Currently, he is working in school of Computer &
Systems Sciences, Jawaharlal Nehru University, New Delhi. His primary research
interests include parallel and distributed system and Grid Computing. He has
published 3 papers in proceedings of peer-reviewed Conferences.
Karan Singh (M-1981) received the Engineering degree (Computer Science &
Engineering) from Kamala Nehru Institute of Technology, Sultanpur, UP, India and
the M.Tech (Computer Science & Engineering) from Motilal Nehru National
Institute of Technology UP, India. He is Ph.D. (Computer Science & Engineering)
from MNNIT Allahabad deemed university. Currently, he is working in school of
Computer & Systems Sciences, JawaharlalNehru University, New Delhi. His
primary research interests are in computer network and computer network security.
He is reviewer of IEEE & Elsevier conferences and reviewer of International
journals. I have research papers (8 Journal, 9 IEEE conferences, 2 Elsevier Conference, 15 National and
International conference) and 2 are accepted. He2 is organizer of various workshop, Conference and
training. Recently, Dr. Karan work as General Chair of Qshine 2013. Dr. Singh has been joined as
Professional member of IEEE, ACM, CSTA, CSI, IACSIT, ICST, IAENG, ACEEE, ISOC and IEEE
computer society.
Shiv Prakash received his M.Tech and PhD in Computer Science from School of
Computer and System Sciences, Jawaharlal Nehru University, New Delhi, India in
2010 and 2014. He has published around 15 papers in various international journals
and around 5 papers in proceedings of peer-reviewed conferences. He is a member
of the IEEE and ACM. His research interest includes parallel/distributed system and
grid computing.

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