UNIVERSITY OF WEST ATTICA
SCHOOL OF ENGINEERING
DEPARTMENT OF COMPUTER ENGINEERING AND INFORMATICS

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Cloud Computing and Services

Use Cases at CloudSim

Vasileios Evangelos Athanasiou
Student ID: 19390005

Supervisor: Vasileios Mamalis, Professor
Co-supervisor: Dimitrios Kallergis, Lecturer in Applications

Athens, June 2024

Overview

This project explores the simulation of cloud computing environments using the CloudSim framework. It focuses on both theoretical and practical analysis of datacenter configurations, Virtual Machine (VM) allocation policies, and Cloudlet scheduling mechanisms.

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Table of Contents

Section	Title	Description
assign	Assignment	Contains assignments and tasks
docs	Documentation	Project documentation, guides, and notes
src	Source Code	All source code files of CloudSim

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Project Components

1. Theoretical Analysis

The project analyzes a specific simulation case (CloudSimExample6) in order to understand how cloud resources are provisioned and managed. The main areas of investigation include:

Infrastructure Setup

• Detailed breakdown of the simulated Datacenters:
  • Datacenter_0
  • Datacenter_1
• Analysis of their underlying Hosts and resource composition.

Hardware Specifications

• Hosts

  • RAM: 2048 MB
  • Storage: 1 TB
  • Bandwidth: 10,000 MB/s

• Processing Units (PEs)

  • Host 0: 4 PEs
  • Host 1: 2 PEs
  • Each PE operates at 1,000 MIPS

Virtual Machine (VM) Configuration

• Total requested VMs: 20
• VM requirements:
  • RAM: 512 MB
  • Processing Elements: 1 PE
  • Performance: 1,000 MIPS

Allocation Policies

• Examination of VmAllocationPolicySimple
• Uses a Worst-Fit policy, selecting the host with the fewest Processing Elements currently in use.

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2. Practical Implementation & Exercises

The project includes a set of experimental scenarios designed to test the flexibility and limitations of the CloudSim simulator:

Policy Comparisons

• Execution of simulations using different scheduling strategies:
  • Space-Sharing
  • Time-Sharing
• Applied at both levels:
  • Cloudlets-to-VMs
  • VMs-to-Hosts

Resource Optimization

• Modification of:
  • Host attributes
  • Number of Processing Elements
  • Number of Hosts
• Goal: Ensure that all 20 VMs can be executed without resource over-subscription.

Code Intervention

• Identification of specific sections in the CloudSim source code where:
  • Custom VM allocation policies
  • Custom Cloudlet scheduling algorithms
    can be implemented.

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Summary of Resources (CloudSimExample6)

Resource	Quantity	Key Attributes
Datacenters	2	Architecture: x86, OS: Linux, VMM: Xen
Hosts	2 per Datacenter	2048 MB RAM, 1000 MIPS per PE
Virtual Machines	20	512 MB RAM, 1000 MIPS, 1 PE
Cloudlets	Multiple	Assigned to VMs using specific scheduling algorithms

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Installation and Run Guide

Prerequisites

• CloudSim Framework: Ensure the CloudSim 4.0 framework is installed and configured.
• Java Development Kit (JDK): A compatible version of JDK (8 or higher) is required.
• IDE: An integrated development environment (IDE) for Java development.

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Install

Clone the repository to your local machine:

git clone https://github.com/Cloud-Computing-and-Services/CloudSim.git

Run

Open the project in IDE for Java Development such as Eclipse

From package /cloudsim-examples/src/main/java/org/cloudbus/cloudsim/examples/ run CloudSimExample6.java to see the simulation