Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!ucbvax!decwrl!hplabs!hpda!hpcupt1!hpsal2!markw
From: markw@hpsal2.HP.COM (Mark Williams)
Newsgroups: comp.arch
Subject: Time Sync in MP System
Message-ID: <2280007@hpsal2.HP.COM>
Date: 3 Jun 89 00:33:55 GMT
Organization: HP System Architecture Lab, Cupertino
Lines: 16

How can I initialize and maintain time synchronization in a
multiprocessor system?  To put this in context, I am seeking an
approach that can be used by the IEEE CSR Standard, which will
be included by reference in Futurebus+ and SCI.  

We have a 64 bit system clock counter register in each node in
the system, which must be initialized  --  and resynchronized due
to local oscillator drift.  The clock counts in nanoseconds, but
nodes can increment by larger quantities if they lack a GHz
oscillator   :<)

If you have a reference on this topic, I would appreciate a posting.

Thanks, Mark Williams (408) 447-0762      EMAIL:  markw@hpda.HP.COM
US MAIL: Mark Williams, MS 42U5, Hewlett Packard, 19447 Pruneridge Av,
Cupertino, Ca 95014