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<== Date ==> <== Thread ==>

Subject: Re: vxWorks
From: Gerry Swislow <certif!gerry@photon.mit.edu>
Date: Fri, 10 Jun 94 13:29:11 -0400
Bob Dalesio writes:

> The $23K license fee has been very difficult for many
> members of the collaboration. We are going to port to some
> other real-time operating system as an alternative. We
> will begin this consideration in the very near future. 


I am certainly naive as to the real-time requirements of EPICS, but maybe  
one system to consider as a target for porting is something like the Venix  
real-time operating system.  Unlike Vx-works and Lynx, Venix is a real UNIX  
SYSVR4.2 operating system.  It's only for Intel x86, but that does mean the  
hardware is cheap and common.  As it is real UNIX, the development  
environment is familiar and one can easily support non-epics VME modules  
with simple C programs on the same processor.  


Features of Venix from its brochure include:

fully preemptible kernel
bounded context switch latencies
fixed priority scheduling
contiguous file system
asynchronous and overlapped I/O
direct physical and I/O memory access
high speed RAM buffering
high resolution alarms (100hz to 10,000hz)
user space interrupts
memory locking
memory preallocation
etc.

The price is something like that for SCO UNIX, say 1-3K, depending on  
whether the software development bits are included, etc.  I'll have the  
brochure and programming manual at the meeting next week if anybody is  
interested.  The company's phone number is 617-661-1230 if somebody is real  
interested.  (My only interest in this is the preference for having a UNIX  
system running EPICS, rather than dealing with VX-works/OS-9/Lynx, etc.)

Gerry Swislow
-  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  - -
Certified Scientific Software  Internet : certif!gerry@photon.mit.edu
PO Box 390640                     Phone : +1 (617) 576-1610
Cambridge, MA  02139                Fax : +1 (617) 497-4242


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