Overview - Functions of an Operating System – Design Approaches – Types of Advanced
Operating System - Synchronization Mechanisms – Concept of a Process, Concurrent
Processes – The Critical Section Problem, Other Synchronization Problems – Language
Mechanisms for Synchronization – Axiomatic Verification of Parallel Programs - Process
Deadlocks - Preliminaries – Models of Deadlocks, Resources, System State – Necessary and
Sufficient conditions for a Deadlock – Systems with Single-Unit Requests, Consumable
Resources, Reusable Resources.
4.1Introduction
- Potential Threats and Attacks on Computer System
- Confinement Problems
- Design Issues in Building Secure Distributed Systems
4.2 Cryptography
- Symmetric Cryptosystem Algorithm: DES
- Asymmetric Cryptosystem
4.3 Secure Channels
- Authentication
- Message Integrity and Confidentiality
- Secure Group Communication
4.4 Access Control
- General Issues
- Firewalls
- Secure Mobile Code
4.5 Security Management
- Key Management
- Issues in Key Distribution
- Secure Group Management
- Authorization Management
Overview - Functions of an Operating System – Design Approaches – Types of Advanced
Operating System - Synchronization Mechanisms – Concept of a Process, Concurrent
Processes – The Critical Section Problem, Other Synchronization Problems – Language
Mechanisms for Synchronization – Axiomatic Verification of Parallel Programs - Process
Deadlocks - Preliminaries – Models of Deadlocks, Resources, System State – Necessary and
Sufficient conditions for a Deadlock – Systems with Single-Unit Requests, Consumable
Resources, Reusable Resources.
4.1Introduction
- Potential Threats and Attacks on Computer System
- Confinement Problems
- Design Issues in Building Secure Distributed Systems
4.2 Cryptography
- Symmetric Cryptosystem Algorithm: DES
- Asymmetric Cryptosystem
4.3 Secure Channels
- Authentication
- Message Integrity and Confidentiality
- Secure Group Communication
4.4 Access Control
- General Issues
- Firewalls
- Secure Mobile Code
4.5 Security Management
- Key Management
- Issues in Key Distribution
- Secure Group Management
- Authorization Management
About Naming Concepts in Distributed systems.
More about its services, its types & the approaches of implementation for Name Space & Name Resolution and Locating Entities Approaches with example diagrams.
A Distributed File System(DFS) is simply a classical model of a file system distributed across multiple machines.The purpose is to promote sharing of dispersed files.
Coda (Constant Data Avaialabilty) is a distributed file system developed at Carnegie Mellon University . This presentation explains how it works and different aspects of it.
File Replication : High availability is a desirable feature of a good distributed file system and file replication is the primary mechanism for improving file availability. Replication is a key strategy for improving reliability, fault tolerance and availability. Therefore duplicating files on multiple machines improves availability and performance.
Replicated file : A replicated file is a file that has multiple copies, with each copy located on a separate file server. Each copy of the set of copies that comprises a replicated file is referred to as replica of the replicated file.
Replication is often confused with caching, probably because they both deal with multiple copies of data. The two concepts has the following basic differences:
A replica is associated with server, whereas a cached copy is associated with a client.
The existence of cached copy is primarily dependent on the locality in file access patterns, whereas the existence of a replica normally depends on availability and performance requirements.
Satynarayanana [1992] distinguishes a replicated copy from a cached copy by calling the first-class replicas and second-class replicas respectively
Synchronization in distributed computingSVijaylakshmi
Synchronization in distributed systems is achieved via clocks. The physical clocks are used to adjust the time of nodes. Each node in the system can share its local time with other nodes in the system. The time is set based on UTC (Universal Time Coordination).
Agreement Protocols, Distributed Resource Management: Issues in distributed File Systems, Mechanism for building distributed file systems, Design issues in Distributed Shared Memory, Algorithm for Implementation of Distributed Shared Memory.
Message and Stream Oriented CommunicationDilum Bandara
Message and Stream Oriented Communication in distributed systems. Persistent vs. Transient Communication. Event queues, Pub/sub networks, MPI, Stream-based communication, Multicast communication
UNIT IV FAILURE RECOVERY AND FAULT TOLERANCE 9
Basic Concepts-Classification of Failures – Basic Approaches to Recovery; Recovery in
Concurrent System; Synchronous and Asynchronous Checkpointing and Recovery; Check
pointing in Distributed Database Systems; Fault Tolerance; Issues - Two-phase and Nonblocking
Commit Protocols; Voting Protocols; Dynamic Voting Protocols;
About Naming Concepts in Distributed systems.
More about its services, its types & the approaches of implementation for Name Space & Name Resolution and Locating Entities Approaches with example diagrams.
A Distributed File System(DFS) is simply a classical model of a file system distributed across multiple machines.The purpose is to promote sharing of dispersed files.
Coda (Constant Data Avaialabilty) is a distributed file system developed at Carnegie Mellon University . This presentation explains how it works and different aspects of it.
File Replication : High availability is a desirable feature of a good distributed file system and file replication is the primary mechanism for improving file availability. Replication is a key strategy for improving reliability, fault tolerance and availability. Therefore duplicating files on multiple machines improves availability and performance.
Replicated file : A replicated file is a file that has multiple copies, with each copy located on a separate file server. Each copy of the set of copies that comprises a replicated file is referred to as replica of the replicated file.
Replication is often confused with caching, probably because they both deal with multiple copies of data. The two concepts has the following basic differences:
A replica is associated with server, whereas a cached copy is associated with a client.
The existence of cached copy is primarily dependent on the locality in file access patterns, whereas the existence of a replica normally depends on availability and performance requirements.
Satynarayanana [1992] distinguishes a replicated copy from a cached copy by calling the first-class replicas and second-class replicas respectively
Synchronization in distributed computingSVijaylakshmi
Synchronization in distributed systems is achieved via clocks. The physical clocks are used to adjust the time of nodes. Each node in the system can share its local time with other nodes in the system. The time is set based on UTC (Universal Time Coordination).
Agreement Protocols, Distributed Resource Management: Issues in distributed File Systems, Mechanism for building distributed file systems, Design issues in Distributed Shared Memory, Algorithm for Implementation of Distributed Shared Memory.
Message and Stream Oriented CommunicationDilum Bandara
Message and Stream Oriented Communication in distributed systems. Persistent vs. Transient Communication. Event queues, Pub/sub networks, MPI, Stream-based communication, Multicast communication
UNIT IV FAILURE RECOVERY AND FAULT TOLERANCE 9
Basic Concepts-Classification of Failures – Basic Approaches to Recovery; Recovery in
Concurrent System; Synchronous and Asynchronous Checkpointing and Recovery; Check
pointing in Distributed Database Systems; Fault Tolerance; Issues - Two-phase and Nonblocking
Commit Protocols; Voting Protocols; Dynamic Voting Protocols;
Advanced Operating System- IntroductionDebasis Das
Introduction to Advanced Operating systems. Many university courses run advanced/ distributed operating system courses in their 4 year engineering programs. This is based on WBUT CS 704 D course but matches many such courses run by different universities. If you need to downloaad this presentation, please send me an email at ddas15847@gmail.com
Definition of Computer
Classification of Computer
Applications of Computer
Block Diagram and Working of Computer System
Different Peripheral Devices
Main Storage and Auxiliary Storage Devices
Computer Hardware and Software
A brief report on Client Server Model and Distributed Computing. Problems and Applications are also discussed and Client Server Model in Distributed Systems is also discussed.
Message Passing, Remote Procedure Calls and Distributed Shared Memory as Com...Sehrish Asif
Message Passing, Remote Procedure Calls and
Distributed Shared Memory as Communication Paradigms for Distributed Systems & Remote Procedure Call Implementation Using Distributed Algorithms
A brief introduction to task communication in real time operating system.It covers Inter-process communication like concepts of shared memory , message passing, remoteprocedure call .Interprocess communication (IPC) refers specifically to the mechanisms an operating system provides to allow the processes to manage shared data. Typically, applications can use IPC, categorized as clients and servers, where the client requests data and the server responds to client requests.Many applications are both clients and servers, as commonly seen in distributed computing.
Distributed Objects and Remote Invocation: Communication between distributed objects
Remote procedure call, Events and notifications, operating system layer Protection, Processes
and threads, Operating system architecture. Introduction to Distributed shared memory,
Design and implementation issue of DSM.Case Study: CORBA and JAVA RMI.
MODULE III Parallel Processors and Memory Organization 15 Hours
Parallel Processors: Introduction to parallel processors, Concurrent access to memory and cache
coherency. Introduction to multicore architecture. Memory system design: semiconductor memory
technologies, memory organization. Memory interleaving, concept of hierarchical memory
organization, cache memory, cache size vs. block size, mapping functions, replacement
algorithms, write policies.
Case Study: Instruction sets of some common CPUs - Design of a simple hypothetical CPU- A
sequential Y86-64 design-Sun Ultra SPARC II pipeline structure
MODULE II Control unit, I/O systems and Pipelining 15 Hours
CPU control unit design: Hardwired and micro-programmed design approaches, Peripheral
devices and their characteristics: Input-output subsystems, I/O device interface, I/O transfersprogram controlled, interrupt driven and DMA, privileged and non-privileged instructions, software
interrupts and exceptions. Programs and processes-role of interrupts in process state transitions,
I/O device interfaces - SCII, USB. Basic concepts of pipelining, throughput and speedup, pipeline
hazards.
Functional Blocks of a Computer: Functional blocks and its operations. Instruction set architecture of a CPU - registers, instruction execution cycle, Data path, RTL interpretation of
instructions, instruction set. Performance metrics. Addressing modes. Data Representation:
Signed number representation, fixed and floating point representations, character representation.
Computer arithmetic - integer addition and subtraction, ripple carry adder, carry look-ahead
adder, etc. multiplication - shift-and add, Booth multiplier, carry save multiplier, etc. Division
restoring and non-restoring techniques, floating point arithmetic.
Module II - Distributed objects and file systems:
Introduction - Communication between distributed objects - Remote procedure call - Events and notifications - case study - Operating system support - introduction - operating system layer - protection - process and threads - communication and invocation - architecture - Introduction to DFS - File service architecture - Sun network file system - Andrew file system - Enhancements and future developments.
Module 2 - Distributed Objects and File Systems
Introduction - Communication between distributed objects - Remote procedure call - Events and notifications - case study - Operating system support - introduction - operating system layer - protection - process and threads - communication and invocation - architecture - Introduction to DFS - File service architecture - Sun network file system - Andrew file system - Enhancements and future developments.
Module I
Introduction to Distributed systems - Examples of distributed systems, resource sharing and the web, challenges - System model - introduction - architectural models - fundamental models - Introduction to inter-process communications - API for Internet protocol - external data.
Module I
Introduction to Distributed systems - Examples of distributed systems, resource sharing and the web, challenges - System model - introduction - architectural models - fundamental models - Introduction to inter-process communications - API for Internet protocol - external data.
Module 6: IP and System Security
IP security overview-IP security policy-Encapsulating Security payload-intruders-intrusion detectionvirus/worms-countermeasure-need for firewalls-firewall characteristics-types of fire
Module 4: Key Management and User Authentication
X.509 certificates- Public Key infrastructure-remote user authentication principles-remote user
authentication using symmetric and asymmetric encryption-Kerberos V5
Module 1: Introduction to Cryptography and Symmetric Key Ciphers
Computer Security Concepts - OSI Security Architecture -Security Attacks - Services, Mechanisms -
Symmetric Cipher Model - Traditional Block Cipher Structure - The Data Encryption Standard -The Strength of DES - Advanced Encryption Standard.
Module 6
Advanced Networking
Security problems with internet architecture, Introduction to Software defined networking, Working of SDN, SDN in data centre, SDN applications, Data centre networking, IoT.
Module 6: Standards for Information Security Management
Information Security Management Systems (ISMS) - ISO 27001 - Framing Security Policy of
Organization- Committees- Security Forum, Core Committee, Custodian and Users, Business
Continuity Process Team & Procedure- Information Security Auditing Process. IT Security Incidents
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
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Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
3. What is Distributed Systems?
Distributed System is used to describe a
system with the following characteristics:
Consists of several computers that do not
share a memory or a clock;
The computers communicate with each other
by exchanging messages over a
communication network; and
Each computer has its own memory and runs
its own operating system.
5. What is Distributed Operating Systems?
It extends the concepts of resource management and
user friendly interface for shared memory computers a
step further, encompassing a distributed computing
system consisting of several autonomous computers
connected by a communicating network.
A distributed OS is one that looks to its users like an
centralized OS but runs on multiple, independent CPUs.
The key concept is transparency. In other words, the use
of multiple processors should be invisible to the user
6. Issues in Distributed OS
Global Knowledge
Naming
Scalability
Compatibility
Process Synchronization
Resource Management
Security
Structuring
8. Naming
Name refers to objects [ Files, Computers etc]
Name Service Maps logical name to physical
address
Techniques
LookUp Tables [Directories]
Algorithmic
Combination of above two
9. Scalability
Grow with time
Scaling Dimensions – Size, Geographically &
Administratively
Techniques – Hiding Communication
Latencies, Distribution & Caching
10. Scaling Techniques (1)
Hide Communication Latencies
1.4
The difference between letting:
a) a server or
b) a client check forms as they are being filled Scalability cont….
12. Scaling Techniques (3)
Replication
Replicate components across the distributed
system
Replication increases availability , balancing
load distribution
Consistency problem has to be handled
15. Resource Management
Make both local and remote resources
available
Specific Location of resource should be hidden
from user
Techniques
Data Migration [DFS, DSM]
Computation Migration [RPC]
Distributed Scheduling [ Load Balancing]
16. Security
Authentication – a entity is what it claims to
be
Authorization – what privileges an entity has
and making only those privileges available
17. Structuring
Techniques
Monolithic Kernel
Collective Kernel [Microkernel based , Mach, V-
Kernel, Chorus and Galaxy]
Object Oriented OS [Services are implemented as
objects, Eden, Choices, x-kernel, Medusa, Clouds,
Amoeba & Muse]
Client-Server Computing Model [Processes are
categorized as servers and clients]
18. Communication Primitives
High level constructs [Helps the program in
using underlying communication network]
Two Types of Communication Models
Message passing
Remote Procedure Calls
19. Message Passing
Two basic communication primitives
SEND(a,b) , a Message , b Destination
RECEIVE(c,d), c Source , d Buffer for storing the
message
Client-Server Computation Model
Client sends Message to server and waits
Server replies after computation
Message Passing cont..
20. Design Issues
Blocking vs Non blocking primitives
Nonblocking
SEND primitive return the control to the user process as soon as the
message is copied from user buffer to kernel buffer
Advantage : Programs have maximum flexibility in performing
computation and communication in any order
Drawback Programming becomes tricky and difficult
Blocking
SEND primitive does not return the control to the user process until
message has been sent or acknowledgement has been received
Advantage : Program’s behavior is predictable
Drawback Lack of flexibility in programming
Message Passing cont..
21. Design Issues cont..
Synchronous vs Asynchronous Primitives
Synchronous
SEND primitive is blocked until corresponding RECEIVE primitive
is executed at the target computer
Asynchronous
Messages are buffered
SEND primitive does not block even if there is no corresponding
execution of the RECEIVE primitive
The corresponding RECEIVE primitive can be either blocking or
non-blocking
22. Details to be handled in Message Passing
Pairing of Response with Requests
Data Representation
Sender should know the address of Remote
machine
Communication and System failures
23. Remote Procedure Call (RPC)
RPC is an interaction between a client and a
server
Client invokes procedure on sever
Server executes the procedure and pass the
result back to client
Calling process is suspended and proceeds
only after getting the result from server
25. Structure
RPC mechanism is based upon stub procedures.
Unpack
Execute
Procedure
Stub
Procedure
Remote
Procedure
Return
Pack
result
Local
Procedure
Call
Local
Procedure
Call
User
Program
Stub
Procedure
Pack
parameters
& Transmit
wait
Unpack
Result
Return
from local
call
Client Machine
Server Machine
28. Parameter and Result Passing
Stub Procedures Convert Parameters & Result to appropriate
form
Pack parameters into a buffer
Receiver Stub Unpacks the parameters
Expensive if done on every call
Send Parameters along with code that helps to identify format
so that receiver can do conversion
Alternatively Each data type may have a standard format.
Sender will convert data to standard format and receiver will
convert from standard format to its local representation
Passing Parameters by Reference
29. Error handling, Semantics and Correctness
RPC may fail either due to computer or communication failure
If the remote server is slow the program invoking remote
procedure may call it twice.
If client crashes after sending RPC message
If client recovers quickly after crash and reissues RPC
Orphan Execution of Remote procedures
RPC Semantics
At least once semantics
Exactly Once
At most once
30. Correctness Condition
Given by Panzieri & Srivastava
Let Ci denote call made by machine & Wi
represents corresponding computation
If C2 happened after C1 ( C1 C2) &
Computations W2 & W1 share the same data,
then to be correct in the presence of failures
RPC should satisfy
C1 C2 implies W1 W2