Real Time

Jim Lux jimlux at
Tue Mar 6 17:43:39 PST 2001

While not a beowulf, I am currently working on a very hard real time (<1
microsecond) system (a radar) using an MPI like interprocessor interface
between DSPs.  It is entirely possible to have hard real time systems with
nondeterministic communications.

----- Original Message -----
From: "Greg Lindahl" <lindahl at>
To: <beowulf at>
Sent: Tuesday, March 06, 2001 2:44 PM
Subject: Re: Real Time

> On Tue, Mar 06, 2001 at 01:23:16PM -0800, Larry Lesser wrote:
> > I am trying to find out if anyone has built a Beowulf on Mac G4s with a
> > real time operating system, MPI (any flavor) and Myrinet?
> I believe that several of the vendors in the embedded systems market
> sell systems like that.
> I'm not so sure that a real time operating system coupled with MPI is
> going to do that much good compared to Linux with MPI, since use of
> MPI is going to blow away your hard real time guarantees. (Oh, darn,
> bad CRC, we have to retransmit that packet...)
> -- g
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