Subject: |
Re: vxWorks |
From: |
Gerry Swislow <[email protected]> |
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
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Certified Scientific Software Internet : [email protected]
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Cambridge, MA 02139 Fax : +1 (617) 497-4242
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