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dbehr@dos-lan.cs.up.ac.za (Danie Behr) writes:

>Can anyone help me with the differences/similarities between OSF/1 and Mach 
>please.

Me too. OSF/1 is a branch off from Mach. AT this stage, I'm quite bewildered
by the different MK numbers from two different sources. Can anyone point me
at the pedigrees of the various versions of ASF/1 and Mach ?
-- 
================================================================================
| Dominic Herity,  dherity@.cs.tcd.ie,                      | Something clever |
| Computer Science Dept, Trinity College, Dublin 2, Ireland.| coming soon to a |
| Tel : +353-1-6772941 ext 1720 Fax : +353-1-6772204        |signature near you|

In article <1992Nov18.131151.2051@cs.tcd.ie> dherity@cs.tcd.ie (Herity D.) writes:
>dbehr@dos-lan.cs.up.ac.za (Danie Behr) writes:
>
>>Can anyone help me with the differences/similarities between OSF/1 and Mach 
>>please.
>
>Me too. OSF/1 is a branch off from Mach. AT this stage, I'm quite bewildered
>by the different MK numbers from two different sources. Can anyone point me
>at the pedigrees of the various versions of ASF/1 and Mach ?
>-- 
OSF/1 is an operating system that is implemented on top of Mach, either 
with an intergrated kernel (procedure calls) or micro kernel (message
passing).  The kernel used is Mach (2.5 is proc, 3.0 is ipc).
In particular the OSF organization created the OSF/1 operating system; a
very robust operating system with unix type interface.  I think
the current OSF/1 os (which comes with their mach enhancements) is 4.0.
>================================================================================
>| Dominic Herity,  dherity@.cs.tcd.ie,                      | Something clever |
>| Computer Science Dept, Trinity College, Dublin 2, Ireland.| coming soon to a |
>| Tel : +353-1-6772941 ext 1720 Fax : +353-1-6772204        |signature near you|

In article <1992Nov20.182135.12294@awdprime.austin.ibm.com>, pbahrs@netftp.austin.ibm.com (Peter C Bahrs (boca)) writes:
> In article <1992Nov18.131151.2051@cs.tcd.ie> dherity@cs.tcd.ie (Herity D.) writes:
> >dbehr@dos-lan.cs.up.ac.za (Danie Behr) writes:
> >
> >>Can anyone help me with the differences/similarities between OSF/1 and Mach 
> >>please.
> >
> >Me too. OSF/1 is a branch off from Mach. AT this stage, I'm quite bewildered
> >by the different MK numbers from two different sources. Can anyone point me
> >at the pedigrees of the various versions of ASF/1 and Mach ?
> >-- 
> OSF/1 is an operating system that is implemented on top of Mach, either 
> with an intergrated kernel (procedure calls) or micro kernel (message
> passing).  The kernel used is Mach (2.5 is proc, 3.0 is ipc).
> In particular the OSF organization created the OSF/1 operating system; a
> very robust operating system with unix type interface.  I think
> the current OSF/1 os (which comes with their mach enhancements) is 4.0.

Close.

There are three main versions of OSF/1 available and with differing
purposes.

OSF/1 IK (Not the official name but makes it easier to talk about it) is
the Integrated Kernel version. It was originally based on Mach 2.5 (X115
or thereabouts), what was to be BSD 4.4 and a large engineering effort by
OSF. The first version, 1.0, was shipped in November 1990 and the current
release is 1.1.1 (with 1.1.2 due soon). The architecture is still much
like that of Mach 2.5 in that the Unix and Mach parts reside in the same
address space and access each other via direct procedure calls. This
version comes from OSF Engineering and is intended to be the basis for
people who want to build products.

The OSF Research Institute has two other versions that are available to
OSF members with an OSF/1 source license.

OSF/1 MK is a single server version of OSF/1. The kernel is Mach 3 and the
server architecture is much like that of the CMU BSD server in that it
uses an emulator. This system is primarily a research vehicle at the
moment but we are making architectural changes (like removing the
emulator) which will make it more suitable for general use. The current
release is V4.1 which is based on OSF/1 IK 1.0.4. V5.0 (based on OSF/1
1.1.X) will probably out sometime during Q2 next year.

OSF/1 AD is the version developed for Multicomputors. This is again based
on Mach 3 and started from OSF/1 MK, although obviously significant
changes have been made. Intel have used OSF/1 AD as a basis for their
OS on the new Paragon machines. This version is also being used as a
starting point for the OSF RI work in clustered systems, ie a single 
system image across a number of machines on a fast network. 

I hope this makes things clearer.

Simon.

-- 
  Simon Patience
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