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- Newsgroups: comp.parallel
- Path: sparky!uunet!destroyer!gatech!hubcap!fpst
- From: Lutz Prechelt <prechelt@ira.uka.de>
- Subject: SUMMARY: UNITY implementations
- Message-ID: <1993Jan22.161525.21882@hubcap.clemson.edu>
- Keywords: verification, specification
- Sender: newsadm@ira.uka.de
- Nntp-Posting-Host: i41s18.ira.uka.de
- Organization: University of Karlsruhe, FRG
- Date: Fri, 22 Jan 1993 16:00:32 +0100
- Approved: parallel@hubcap.clemson.edu
- Lines: 420
-
-
- Quite a while back (November 1992) I posted the following request for information:
-
- ------------------------------------------------------------------------------------
- Does anybody know about implementations of the UNITY language ?
- Especially parallel ones ?
-
- We have built a translator from UNITY into MPL on the MasPar and
- I am looking for comparable systems (but also sequential ones).
-
- All pointers and short descriptions are welcome.
- ------------------------------------------------------------------------------------
-
- Our software (mentioned in the reply above) which only works for MasPar MP-1
- and MP-2 SIMD computers, is available for anonymous ftp from
-
- SanFrancisco.ira.uka.de [129.13.13.110]
- in directory /pub/maspar as maspar_unity.tar.Z (154 kB)
-
-
- This is the summary of the replies I received on my request.
- The reason why it comes so late is that
- (a) replies dropped in quite slowly
- (b) I had some additional interaction with some people
- (c) this is still not complete (but now I give up).
-
- Summing up, I must admit that not very much useful information has shown up.
-
- Here are the main parts of the individual replies:
- (Two german colleagues replied in German. Sorry!)
-
- --------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------
-
- From: Andreas Eide <eide@fzi.de>
- Date: Fri, 13 Nov 92 9:34:11 GMT
-
- I am a Norwegian student currently writing my diploma thesis here in
- Karlsruhe. I'm with the group Systementwurf in der Mikroelektronik at
- FZI. I've just started out.
-
- The subject of my thesis is partitioning of UNITY descriptions on MIMD
- architectures. It appears to me that your work might be of interest
- to me.
-
- I would be very grateful for any references to your work. I would also
- be grateful for any references on UNITY.
-
- [[ I asked for the title of his thesis and got: ]]
-
- I supply the bibtex entry of my diploma
- thesis. Please note that the title is not final, and is verly likely
- to change.
-
- @MASTERSTHESIS{Eide93,
- author = {Andreas Eide},
- title = {Partitioning of UNITY Descriptions on MIMD Architectures},
- school = {Norges Tekniske H{\o}gskole, Avdeling for elektro- og datateknikk},
- year = "1993",
-
- address = {N-7000 Trondheim, Norway},
- month = apr,
- note = "Title and date are not final.",
- type = "Hovedoppgave",
- }
-
- --------------------------------------------------------------------------------------
-
- From: "J. Staunstrup" <jst@id.dth.dk>
-
- We have several translators transforming a language called Synchronized
- Transitions (many similarities with UNITY) to C and to various
- circuit realizations (certainly parallel). Several papers have been
- published.
-
- [[ I asked for the references and got: ]]
-
- @article{Staunstrup88,
- author = "J\o{}rgen Staunstrup and Mark R. Greenstreet",
- title = "From High-Level Descriptions to {VLSI} Circuits",
- journal = "{BIT}",
- year = 1988,
- pages = "620-638",
- volume = 28,
- number = 3
- }
- @inproceedings{hawaii,
- author = "Mark Greenstreet and Kai Li and J{\o}rgen Staunstrup",
- title = "Synchronized Transitions on Multiprocessors",
- booktitle = "HICSS-22",
- publisher = "IEEE",
- p year = 1989
- }
- @incollection{st90,
- author = "J\o{}rgen Staunstrup and Mark Greenstreet",
- title = "{Synchronized Transitions}",
- booktitle = "Formal Methods for {VLSI} Design",
- editor = "J\o{}rgen Staunstrup",
- year = 1990,
- pages = "71-128",
- publisher = "North-Holland/Elsevier"
- }
- @inproceedings{Staunstrup91,
- author = "Per H. Christensen and Henrik Hulgaard and J{\o}rgen Staunstrup",
- title = "Synthesis of Delay Insensitive Circuits from Verified Programs",
- booktitle = "Research directions in high-level parallel programming languages",
- editor = "J.-P. Banatre and D. Le Metayer",
- year = "1992",
- publisher = "Springer Lecture Notes 574",
- pages = "326-337"
- }
-
- I recommend that you start with st90.
-
- --------------------------------------------------------------------------------------
-
- From: nbm@epcc.edinburgh.ac.uk
-
- Dave DeRoure at the University of Southampton did some work on a
- Unity implementation on, I think, a transputer based machine.
-
- I'm afraid I don't have an email address handy, but if you are
- interested I can try to dig one out for you.
-
- [[ and a similar one: ]]
-
- From: Catherine Barnaby <cath@inmos.co.uk>
-
- I'm not sure if this is of interest to you...
-
- David DeRoure at Southampton University did some work
- with UNITY as a part of the ESPRIT project PUMA.
-
- Off the top of my head it was looking at
- the use of UNITY for programming PRAM-type machines.
-
- Davids' e-mail is (or was)
- D.DeRoure@ecs.soton.ac.uk
-
- I suggest you contact him directly: I don't even know if he
- still works in the area. If you have problems, contact me again
- and I'll try and sort them out. I'm rather busy, so it may
- take some time.
-
- [[ I contacted DeRoure and got: ]]
-
- From: Dave De Roure <D.C.DeRoure@ecs.southampton.ac.uk>
-
- I was responsible for some UNITY work within an ESPRIT project (PUMA).
- It was in a programming languages workpackage, which include BSP-occam,
- fortran, ML and UNITY. This meant that the UNITY work was seen as a
- very high level programming language, and packaged as such - there is
- a compiler (written in EuLisp) which targets to the common back-end of
- the project (BSP-occam). I wasn't altogether happy with this way
- of using UNITY, but it's turned out to be a useful tool in the sense
- of an executable specification language.
-
- I have some documents from the PUMA project describing the UNITY work - can
- you collect them if I make them available by ftp, or would you prefer me
- to post them?
-
- Let me know how you get on. I've not been able to
- follow up the UNITY work per se, but I'm using many of the ideas in
- other work so I'm still interested.
-
- [[ I requested to get the documents, but did not get any answer ]]
-
- --------------------------------------------------------------------------------------
-
- From: Flemming Andersen <fa@tfl.dk>
-
- I have implemented the UNITY theory in a general theorem proving system
- called HOL. The HOL prover is implemented at the University of Cambridge. The
- socalled HOL-UNITY implementation was made as part of my PhD thesis. It is a
- formalization of the UNITY theory as described in Chandy and Misra's book.
-
- However, HOL-UNITY is not a compiler but a verification tool.
-
- The HOL-UNITY theory is now being used for proving properties of parallel
- programs. The user interface is however still for experts-only. Hence, it is
- planned to extend HOL-UNITY to support automated proof techniques and a
- programming language.
-
- The goal of working with a general theorem prover like HOL is to develop tools
- in a safe way. Tools that are by default proved correct and which are
- hopefully going to be used for verifying (at least parts of) software mainly
- within the area of telecommunication.
-
- [[ I asked for references and whether HOL-UNITY does only reason about
- or does also execute UNITY. I got: ]]
-
- Currently no execution is directly supported, but at the last HOL'93
- Workshop it was told that people are working on tools for executing
- HOL terms. However, we have planned to make a simple interpreter for
- the UNITY programming language as part of the interface work on
- HOL-UNITY.
-
- HOL-UNITY is available as a library in the next version 2.1 of HOL
- system and the HOL system is public domain software.
-
-
- Here are some (LaTeX/BibTeX) references:
-
- \bibitem[And92]{FA92}
- Flemming Andersen.
- \newblock {\em {A Theorem Prover for UNITY in Higher Order Logic}}.
- \newblock PhD thesis, Technical University of Denmark, March 1992.
-
- \bibitem[And92b]{FA92a}
- Flemming Andersen.
- \newblock {A Theory for UNITY in The Cambridge HOL System}.
- \newblock {TFL LD 1992-9}, TFL - Telecommunications Research Laboratory, March
- 1992.
-
- \bibitem[AP91]{FAKDP91}
- Flemming Andersen and Kim~Dam Petersen.
- \newblock {Recursive Boolean Functions in HOL}.
- \newblock In {\em {1991 International Workshop on the HOL Theorem Proving
- System and its Applications}}, pages 367--377. IEEE Computer Society, August
- 1991.
-
- --------------------------------------------------------------------------------------
-
- From: Syst{ Kari <ks@karikukko.cs.tut.fi>
- Date: Fri, 13 Nov 92 16:00:25 +0200
-
- One was published in Comp. Lang. Vol 18., No1. pp 17-30, 1993
- Radha,Muthukrishnan: A Portable implentation of Unity on von Neuman Machines.
-
- [[ The date given for 'was published' was inconsistent with reality.
- So I asked: ]]
-
- > > One was published in Comp. Lang. Vol 18., No1. pp 17-30, 1993
- > ^^^ ^^^^
- > WAS published ? Or will be ?
- > And what is the full name of that journal ?
-
- Hmm... I have a xerox copy of the article. On the left-side corder there
- is 1993 but on the right hand corner "Copyright 1992, Pergmon Press.
-
- Anyway it seems that it is already published !
-
- --------------------------------------------------------------------------------------
-
- From: "Dr. Franz Kurfess" <franz@neuro.informatik.uni-ulm.de>
-
- I don't know of any Unity implementations,
- but I used Unity extensively in my PhD thesis
- "Parallelism in Logic -- Its Potential for Performance and Program Development"
- Vieweg Verlag, Braunschweig, 1991.
-
- --------------------------------------------------------------------------------------
-
- From: filali@irit.fr
-
- I work on UNITY. I would be very interested by the
- work you have done with UNITY and MPL.
-
- [[ I cried 'MORE INFORMATION' but did not get something concrete ]]
-
- --------------------------------------------------------------------------------------
-
- From: Jayadev Misra <misra@cs.utexas.edu>
-
- I have forwarded your request to Allen Emerson for information about
- implementations of UNITY to two people (Rajive Bagrodia and Flemming Andersen)
- who should be able to give you some pointers.
-
- I would be interested in reading about your UNITY implementation if you have
- a manual.
-
- [[ Later I received some pointers from Mani Chandy, see below ]]
-
- --------------------------------------------------------------------------------------
-
- From: BAGGETT WILLIAM B <BAGGETTW@memstvx1.memst.edu>
-
- Please let me know about the response you received to your question
- about UNITY implementations. I am reading the textbook for a class I am
- taking this semester. I could work on a sequential implementation for
- a class project, but I would like to know what is already out there. Is
- your translator to MPL available?
-
- --------------------------------------------------------------------------------------
-
- From: Arnulf Mester <mester@ls4dec4.informatik.uni-dortmund.de>
-
- Aus dem hohlen Bauch heraus faellt mir die
- Program Composition Motation (PCN, von C. oder M., historisch nach UNITY)
- ein, zu deren Lehre auch ein Werkzeug entwickelt worden sein soll.
-
- Ausserdem existiert irgendwo im Mittelsueden (Saarbruecken?)
- eine UNITY Interpreter Implementierung.
-
- Da ich privat gerade umziehe, komme ich nicht an die Unterlagen.
- Bei Interesse bitte in zwei Wochen nochmal kurz anmailen - dann kann ich
- sie raussuchen.
-
- [[ and a later mail included: ]]
-
- H. Peter Gumm, MUNITY
- Uni Marburg, Informatik, 14 S.
- wahrscheinlich weniger von Interesse, zielt in Richtung Goldschlag
- beschreibt einen interactive verifier for UNITY programs
- Papier vom GI/ITG Workshop der FG KUVS Magdeburg April? 92
-
- --------------------------------------------------------------------------------------
-
- From: "K. Mani Chandy" <mani@vlsi.cs.caltech.edu>
-
- I have heard that the following people were working on UNITY
- implementations, but you should check with them directly.
-
- Bill Mayne
- 9707 Lawndale Dr.
- Silver Spring
- MD 20901.
-
- Bill Mayne
- 9707 Lawndale Dr.
- Silver Spring
- MD 20901.
-
- UNITY at U.B.C.
- Alan Wagner
- University of British Columbia,
- Computer Science Department,
- Vancouver,
- British Columbia,
- Canada,
- electronic mail:wagner@cs.ubc.ca
-
- Prof. James C. Browne,
- Computer Science Department,
- Taylor Hall,
- University of Texas,
- Austin, Texas 78712-1188,
-
- Dr. Andre Stern,
- Oxford University Computing Lab,
- Programming Research Group,
- 8-11 Keble Road,
- Oxford OX1 3QD,
- UNITED KINGDOM, electronic-mail:
- stern%prg.oxford.ac.uk@NSFnet-Relay.AC.UK
-
- Dr. Filali Mamoun,
- Chercheur CNRS,
- Laboratoire LSI-IRIT,
- Universite Paul Sabatier,
- F-31062 Toulose Cedex,
- France.
-
- Arnulf Mester
- University of Dortmund, Dept. of Computer Science
- IRB
- POB. 500 500, D-4600 Dortmund 50, West Germany
- e-mail: am@heike.informatik.uni-dortmund.de
-
- Mr. Edgar Lederer
- Institut fur Informatik der Universitat Zurich
- Winterthurerstrasse 190
- CH-8057 Zurich
- Switzerland
-
- Frank Bieler <bieler@karlsruhe.gmd.dbp.de>
-
- [[ I tried to contact these people, the results are below ]]
-
- --------------------------------------------------------------------------------------
-
- From: bieler@karlsruhe.gmd.de
-
- Ja, ganz recht, ich habe mich mal mit UNITY beschaeftigt. Ist schon
- ein paar Jahre her. Ich habe fuer die Programmnotation von UNITY
- einen Compiler geschrieben, der ein UNITY-Programm in eine
- Zwischendarstellung uebersetzt. Diese wird dann von einem
- sequentiellen Interpreter abgearbeitet. Den Fixpunkt eines Programms
- habe ich mit einer Schattenspeicher-Technik festgestellt (Speicher
- verdoppelt und verglichen, ob sich was veraendert hat).
-
- Das alles ist aber nicht mehr in Gebrauch. Ich habe den ganzen Kram
- Edgar Knapp zur Verfuegung gestellt (Mitarbeiter von Misra). Der
- wollte einen Proof-Checker bauen und mein Frontend verwenden. ich
- weiss aber nicht, was sich daraus entwickelt hat.
-
- Als Literatur kann ich Dir nur ein internes Papier von mir geben
-
- --------------------------------------------------------------------------------------
-
- From: Alan Wagner <wagner@cs.ubc.ca>
-
- I am still very interested in UNITY, unfortunately we
- have had very little opportunity to look at it in any
- detail.
-
- --------------------------------------------------------------------------------------
-
- From: Syed Irfan Hyder <hyder@cs.utexas.edu>
-
- Look for K. Mani Chandy's work on PCN. I think it
- is some kind of implementation of Unity.
-
- Send mail to gouda@cs.utexas.edu
- or misra@cs.utexas.edu
-
- Both teach the book on unity.
-
- --------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------
-
- That's all folks
-
- Lutz
-
- Lutz Prechelt (email: prechelt@ira.uka.de) | Whenever you
- Institut fuer Programmstrukturen und Datenorganisation | complicate things,
- Universitaet Karlsruhe; D-7500 Karlsruhe 1; Germany | they get
- (Voice: ++49/721/608-4068, FAX: ++49/721/694092) | less simple.
-
-