UDel CISC361 Study Operating System principles - processes, threads - - PowerPoint PPT Presentation

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Nov 09, 2022 419 likes •537 views

UDel CISC361 Study Operating System principles - processes, threads - scheduling - mutual exclusion - synchronization - deadlocks - memory management - file systems - virtualization - security/networking (if time allows) Operating Systems

SLIDE 1

UDel CISC361

Study Operating System principles

processes, threads
scheduling
mutual exclusion
synchronization
deadlocks
memory management
file systems
virtualization
security/networking (if time allows)

SLIDE 2

Operating Systems

Use of Solaris

advanced OS features
zones (virtual machines)
ZFS (advanced Filesystem)
Start up system (SMF)
Process scheduling
xVM (xen hypervisor)
etc

Some mention of Linux also What is an Operating System?

SLIDE 3

What is an Operating System?

Software that sits close to the hardware and acts as an intermediary between user and hardware. OK, for a desktop, but what about over the network? What about running multiple virtual systems? Also, an OS makes the hardware useful

SLIDE 4

OS Stack

Applications Shell or GUI Libraries System call Interface OS kernel Device Drivers Hardware Entry points to kernel

SLIDE 5

OS Terms

Kernel mode (protected from tampering)

vs. User mode.

Multiprogramming

allow multiple user programs to be

active at the same time

can get better processor utilization
some programs may be waiting for

I/O – allow others to use cpu I/O vs. compute jobs Timesharing – multiple users (jobs)

SLIDE 6

What is Unix?

Developed from multics on PDP-7 by Ken Thompson at Bell Labs SYSV vs BSD Current Unix versions

Solaris, AIX, Linux, *BSD, OS X

Others

HP-UX, IRIX, OSF, Tru64

SLIDE 7

SYSV vs. BSD

Using Solaris as an example of each /usr/bin – contains SYSV programs /usr/ucb – contains BSD programs e.g. different options to ls and ps What about Linux? What about GNU?

SLIDE 8

Standards

POSIX – Portable Operating Systems Interface for uniX.

minimal set of system calls that must

be supported.

several other standards also
posix thread library (pthreads)

What about GNU?

SLIDE 9

Overview of main topics

Process Management Mutual Exclusion, Synchronization Deadlocks Memory Management Storage Management

file systems

Virtualization Security Distributed Systems

networks

SLIDE 10

Computing Environments

Stand alone PCs or Workstations Client-server Thin clients – Sun Rays, xterms Virtual systems “The Network is the Computer” Web apps platform independence