Path: utzoo!attcan!uunet!husc6!purdue!gatech!hubcap!kong
From: kong@CS.UCLA.EDU (Kong Li)
Newsgroups: comp.parallel
Subject: Re: fine-grained and/or multiway optimi
Keywords: Time Warp
Message-ID: <3533@hubcap.UUCP>
Date: 14 Nov 88 13:35:24 GMT
Sender: fpst@hubcap.UUCP
Lines: 26
Approved: parallel@hubcap.clemson.edu

In article <3485@hubcap.UUCP> khb@Sun.COM (Keith Bierman - Sun Tactical Engineering) writes:
>In article <3465@hubcap.UUCP> wilson@uicbert.eecs.uic.edu writes:
>>   2.  Are there any explicitly optimistic programming systems, with
>>       language constructs that specify/allow optimistic execution?
>
>TimeWarp the first operating system with virtual time. Contact Brian
>Beckman at JPL, or look into back issues of CACM; the idea was
>formulated by a UCLA professor (still there, I think), the first

Yes, he is here. His name is David Jefferson. A co-inventor of the
Time Warp mechanism is Henry Sowizal.

>hypercube implementation was done by Brian and some folks reporting to
>him (mostly him, I think). There are others working on this for
>networks and such. At one time there was a Mac simulator, a Sun
>network implementation and a JPL Mark II hypercube implementation. I
>don't know the projects current status.

The Time Warp is already implemented on a JPL Mark III hypercube. For
current status, have a look at "Distributed Simulation and the Time Warp
Operating System" by David Jefferson, Brian Beckman, et al. UCLA CSD
Tech. Rept. CSD-870042, Aug. 1987. That paper is also available in a
recent conference. But I forgot which one it is.

'Kong
(kong@cs.ucla.edu)