Inferno O.S.
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Inferno O.S.

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    Inferno O.S. Inferno O.S. Presentation Transcript

    • Overview :
      Introduction
      Design principles
      Inferno Interfaces
      Application Layer
      Kernel Layer
      Hardware Layer
      Inferno Resources
      Pros & Cons
      Questions
      8/12/2010
      1
    • Introduction:
      Developed in Lucent technologies by Dennis Ritchie. but is now developed and maintained by Vita Nuova Holdings as free software.
      Replaces a plethora of protocols in a network by a simple unifying file service protocol (styx).
      Applications compute their own name spaces and consider all resources as file systems.
      Inferno was based on the experience gained with Plan 9 os from Bell Labs.
      The name of the operating system and many of its associated programs, as well as that of the current company, were inspired by Dante Alighieri'sDivine Comedy.
      8/12/2010
      2
    • Inferno's definitive strength lies in its portability and versatility across several dimensions:
      Portability across processors
      Portability across environments
      Minimal hardware requirements
      Portable applications
      8/12/2010
      3
    • Design Principles:-
      Inferno was first made in 1995 by members of Bell Labs' Computer .It is a distributed operating system based on 3 basic principles drawn from Plan 9.
      Resources as files:- all resources are represented as files within a hierarchical file system .The advantages of using file systems are:-
      File systems have simple and well understood interfaces across a wide variety of operating systems.
      Naming conventions for files are well known, uniform and easily understood
      8/12/2010
      4
    • Reliance on file systems reduces the amount of interface code and keeps the Inferno system small, reliable and highly portable .
      Access rights and permissions to files are simple, yet can be used to ensure multiple levels of security
      NAMESPACE:-
      the application view of the network is a single, coherent namespace that appears as a hierarchical file system but may represent physically separated (locally or remotely) resources.
      The Inferno Namespace is a hierarchical collection of files (i.e. resources).
      8/12/2010
      5
    • Every process accesses its resources via its own namespace
      can inherit from parent
      share with other processes
      Local and remote resources are bound into the namespace
      Standard communication protocol:a standard protocol, called Styx,is used to access all resources, both local and remote.
      8/12/2010
      6
    • Styx Message Structure:-
      Indicates message type: initial transmission (T-message) or reply message (R-message)
      Unique identifier used to track commands
      Unsigned integer that represents “current” file
      Message specific data
      fid
      Contents
      tag
      type
      8/12/2010
      7
    • History:-
      8/12/2010
      8
    • Inferno Interfaces:-
      8/12/2010
      9
    • Inferno has mainly three layers.
      (i) Application layer
      (ii) Kernel layer
      (iii)Hardware layer
      8/12/2010
      10
    • Application Layer:-
      Limbo is fully type checked at compile and run time.
      No memory protection H/W is there.
      All LIMBO data and program objects are subject to a garbage collector built deeply into LIMBO run time system.
      All System data objects are kept track of and freed as soon as they become idle.
      8/12/2010
      11
    • DisVirtualmachine: - Limbo programs are compiled into byte-codes representing instructions for a virtual machine called Dis.
      Dis has 3 address machine , supplemented with few specialized operations for handling arrays and strings.
      The byte codes are expanded into a format more efficient for execution.
      8/12/2010
      12
    • Kernel Layer:-
      Namespace :
      Memory management
      Process management
      Security in Inferno
      Security mechanisms
      8/12/2010
      13
    • Hardware Layer:-
      Device drivers:- A device driver simplifies programming by acting as a translator between a device and the applications or operating systems that use it
      In computing, a device driver or software driver is a computer program allowing higher-level computer programs to interact with a hardware device.
      A driver typically communicates with the device through the computer bus or communications subsystem to which the hardware is connected.
      8/12/2010
      14
    • Host os:- Inferno can run in different host operating system
      Host systems
      Windows NT/2000/XP
      Linux
      MacOS
      Plan9os
      Solaris
      8/12/2010
      15
    • Inferno Resources:-
      8/12/2010
      16
    • External Environment of Inferno Applications :-
      The purpose of most Inferno applns is to present information n/media to user.
      Regardless of whether resources are local/global, a communication protocol called styx is used.
      The glue that connects diff parts of the resource name space together is the styx protocol.
      Inferno kernel implements a mount driver which transforms file operations to RPC’s for transport over the network.
      8/12/2010
      17
    • Internal Environment of Inferno Applications:-
      LIMBO programs are built of modules, which are self contained units .
      Modules are accessed dynamically by executing a load statement.
      Limbo is fully type checked at compile and run time.
      No memory protection H/W is there.
      All System data objects are kept track of and freed as soon as they become idle.
      8/12/2010
      18
    • Advantages:-
      Cross platform integration
      Transparent resource access
      Secure communication
      8/12/2010
      19
    • Future scope:-
      Telephony
      Call setup
      Device control
      Text to Speech
      Network Gateways
      8/12/2010
      20
    • Conlcusion:-
      “ Inferno does have a full-blown operating system and a virtual machine and a protocol stack, and in a lot of respects is something Java would like to be when it grows up. “ - Peter Bernstein,
      Inferno is a unique network operating system that adapts to whatever you plug into it -- from a high-end workstation to an inexpensive hand-held device," noted Dennis Ritchie,
      One of the most significant differences between Inferno and other operating systems such as JavaOS is the way in which Inferno presents network resources to an application.
      8/12/2010
      21
    • References:-
      Bell Labs Technical Journal.
      Plugins, Vita Nuova.
      http://code.google.com/p/inferno-ds.
      www.vitanuova.com
      8/12/2010
      22
    • 8/12/2010
      23
    • QUESTIONS
      8/12/2010
      24