OS Mélange

OS mélange

What does an OS do ? Resource control/sharing ● Resource Policing ● Lower layer abstraction ● Mechanism Vs Policy ●

OS Tit-bits Preemptive Multitasking vs Cooperative ● Multitasking OS API vs OS Implementation ● Microkernel Vs Monolithic Kernels ● Hardware based isolation aka Address ● spaces Posix – Portable Operating System ● Interface for Unix

Microkernel OS Structure Severs Servers File System Drivers Kernel Hardware

HURD Hurd' stands for `Hird of Unix-Replacing ● Daemons'. And, then, `Hird' stands for `Hurd of Interfaces Representing Depth' GNU's dream OS, started dev in 1990 ● Used the MACH microkernel ● Due to MACH's Performance woes,they ● have moved over to L4 very recently Microkernel Approach ●

HURD HURD development never finished ● Linux became too popular, most of the ● GNU work done came to be used in the Linux Operating System. Purist insist on calling such systems GNU/ ● Linux

L4 MACH, the pioneer of the Microkernel ● idea had miserable performance Extremely low memory footprint ● FAST ! ● Highly optimised ● Due to its small size, efforts are on to ● prove its correctness formally L4.Sec Project

BEOS Screen shot

BEOS Made in 1991 by BE Inc ● Initially ran on ATT hardware ● Ported to Power PC in hope Apple would ● buy them, but Apple instead went for NextStep Failed commercially ● Band of loyal supporters have tried to a ● complete re-implementation of the BEOS API in “Haiku”

Singularity Microsoft Research project ● Radically different approach ● Software based Isolation ● Entire OS written in C#, which is a safe, ● managed language There is just one Address space, isolation ● is guaranteed by maintaining invariants in terms of “no cross references” etc

Guess the operating system ??

React OS – Windows Done Right Clean room re-engineering of windows ● API GPL ● Under heavy development ● Currently undergoing a phase of self audit ● to ensure complete legality

Syllable Hobbyist OS gone big ● 99% POSIX compliant ● Only for x86 ● Incredibly responsive and fast boot up ● 8 second bootup – 2 second login –

Future Directions Web Only operating systems ● Google OS ?? – Virtual Machine based approach ● Simulate multiple machines on your machine, – run whatever OS you fancy on each of them (Xen, VMware)

Other Notables OS2/Warp ● FreeBsd ● Minix ●

Images Linux Logo: http://www.linux.org/info/logos.html ● GNU Logo: http://www.gnu.org/ ● FreeBSD logo: http://en.wikipedia.org/wiki/FreeBSD ● L4 Pistachio Logo:http://l4ka.org/projects/pistachio/ ● Hurd logo: http://www.gnu.org/software/hurd/hurd.html ● Syllable logo: http://www.osnews.com/story.php?news_id=7900 ● BEOS Snapshot: http://en.wikipedia.org/wiki/BeOS ● ReactOS Snapshot: http://www.reactos.org/en/index.html ●

OS Mélange

by guest9006ab

Accessibility

Categories

Upload Details

Usage Rights

1 Embed 2

Statistics

OS Mélange Presentation Transcript

OS Mélange

by guest9006ab

Accessibility

Categories

Upload Details

Usage Rights

1 Embed 2

Statistics

OS Mélange Presentation Transcript

Let LinkedIn power your SlideShare experience

Let LinkedIn power your SlideShare experience

Customize SlideShare content based on your interests

Keep up to date when your LinkedIn contacts post on SlideShare