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- From: shapiro@yoko.inria.fr (Marc Shapiro)
- Newsgroups: comp.doc.techreports
- Subject: Reports from INRIA/SOR
- Date: 15 Dec 1992 18:07:44 GMT
- Organization: INRIA -- Institut National de Recherche en Informatique et Automatique -- Rocquencourt, France
- Lines: 372
- Approved: compdoc-techreports@ftp.cse.ucsc.edu
- Message-ID: <1gl6tgINNa1a@darkstar.UCSC.EDU>
- Reply-To: Marc Shapiro <shapiro@corto.inria.fr>
- NNTP-Posting-Host: oak.ucsc.edu
- Originator: golding@oak
-
-
- A number of new publications (articles and tech reports) are available
- by anonymous FTP from the INRIA group SOR.
-
- For a terse project description and a long bibliography of the SOR
- group, retrieve the file SOR.ps.Z.
-
- The rest of this message consists of:
- 1. FTP instructions
- 2. a list of the new reports
- 3. abstracts of the new reports
-
- Marc Shapiro
-
- M. Shapiro, INRIA, B.P. 105 Rocquencourt, 78153 Le Chesnay Cedex, France.
- Tel.: +33(1)39-63-53-25; fax: +33(1)39-63-53-30; e-mail: marc.shapiro@inria.fr
-
- ======================================================================
-
- 1. F T P I N S T R U C T I O N S
- ===================================
-
- Publications of the INRIA/SOR group available by anonymous FTP:
- Host: ftp.inria.fr [128.93.1.26]
- Login: ftp
- Password: your own e-mail address
- Directory: INRIA/publication/SOR
-
- The papers are compressed 300dpi Postscript. Remember to use FTP `binary'
- or `image' mode when transferring compressed files. Hardcopy can be
- ordered by sending e-mail to Nelly Maloisel <nelly.maloisel@inria.fr>.
-
- The file README contains a full list of all the papers available by FTP,
- ordered most recent first. (This is the only file in plain ASCII.)
-
- The file SOR.ps.Z contains a project description and bibliography,
- periodically updated.
-
- ======================================================================
-
- 2. L I S T O F T H E N E W P A P E R S
- ================================================
-
- SSPC:rr1799.ps.Z "SSP Chains: Robust, Dist. References Supporting
- Acyclic Garbage Collection", M. Shapiro, P. Dickman,
- D. Plainfoss\'e. Rapport de Recherche INRIA 1799 and
- Broadcast Technical Report no. 1.
-
- KFS:rr-1809.ps.Z "KFS: Le syst\`eme de fichiers de Kitlog". C.
- Fouqu\'e. Rapport de Recherche INRIA 1809.
- (In French)
-
- Kitlog:srds.ps.Z "Kitlog: a Generic Logging Service". M. Ruffin. 11th
- Symp. on Reliable Dist. Systems (SRDS), Houston TX
- (USA), Oct 1992.
-
- FI:usenixWinter93.ps.Z "Fault Interpretation: Fine-Grain Monitoring of Page
- Accesses", D. Edelson. 1993 Usenix Winter Conference,
- San Diego CA (USA), jan 1993
-
- GFOSFDSS:iwooos92.ps.Z "A Generic Fragmented Object Structured Framework for
- Distributed Storage Support", H. Soulard, M.
- Makpangou. 3d Int. Workshop on Object-Orientation in
- Operating Systems, Dourdan, France, Sept. 1992.
-
- RFOM:iwooos92.ps.Z "A Refinement of the Fragmented Object Model", P.
- Dickman, M. Makpangou. 3d Int. Workshop on
- Object-Orientation in Operating Systems, Dourdan,
- France, Sept. 1992.
-
- DGCOOS:iwooos92.ps.Z "A Distributed GC for Object Oriented Systems", D.
- Plainfoss\'e, M. Shapiro. 3d Int. Workshop on
- Object-Orientation in Operating Systems, Dourdan,
- France, Sept. 1992.
-
- IRCL:iwooos92.ps.Z "Implementing References as Chains of Links", J.
- Maisonneuve, M. Shapiro, P. Collet. 3d Int. Workshop
- on Object-Orientation in Operating Systems, Dourdan,
- France, Sept. 1992.
-
- PC++GC:iwmm92.ps.Z "Precompiling C++ for Garbage Collection", D. Edelson.
- Int. Workshop on Memory Management, Saint-Malo (France)
- sept. 1992.
-
- EFTGC:iwmm92.ps.Z "Experience with a Fault-Tolerant Garbage Collector in
- a Distributed Lisp System", D. Plainfoss\'e, M.
- Shapiro. Int. Workshop on Memory Management,
- Saint-Malo (France) sept. 1992.
-
- SPC++:usenixC++92.ps.Z "Smart Pointers: They're Smart, but They're Not
- Pointers", D. Edelson. Usenix C++ Conf., Portland OR
- (USA), aug. 1992.
-
- ======================================================================
-
- 3. A B S T R A C T S
- ======================
-
- ----------------------------------------------------------------------
- SSPC:rr1799.ps.Z
-
- SSP Chains: Robust, Distributed References
- Supporting Acyclic Garbage Collection
-
- Marc Shapiro, Peter Dickman, David Plainfoss\'e
- Rapport de Recherche INRIA 1799 and Broadcast Technical Report no. 1.
-
- ABSTRACT
-
- SSP chains are a novel technique for referencing objects in a distributed
- system. To client software, any object reference appears to be a local
- pointer; when the target is remote, an SSP chain adds an indeterminate
- number of levels of indirection. Copying a reference across the
- distributed system extends an SSP chain at one end; migrating the target
- object extends it at the other end. Invocation through an SSP chain is
- efficient: each stage of an SSP chain contains location information and
- long chains are short-cut at invocation time. These actions require
- (almost) no extra messages in addition to those of the client application.
- The rules for creating, using, modifying and deleting SSP chains are stated
- precisely and maintain well-defined invariants. The invariants hold even
- in the presence of message failures (loss, duplication, late delivery);
- after a crash, the existence invariants must be re-established. SSP chains
- support distributed garbage collection (GC); we present a robust
- distributed variant of reference counting. The techniques presented here
- are cheap, robust, widely applicable, and scalable.
-
- ----------------------------------------------------------------------
- KFS:rr-1809.ps.Z
-
- KFS: Kitlog File System
- (in French)
-
- Carole Fouqu\'e
-
- ABSTRACT
-
- This report describes the design of KFS (Kitlog File System). KFS is a
- log-structured file system implemented on top of the general purpose
- logging service Kitlog. This work validates the Kitlog model by showing
- that services provided by a generic logging tool adequatly support the
- specific needs of the file system. As a result, the design of the KFS file
- system is simplified, because a number of usefull mechanisms such as free
- space management or data lookup are already supported by the Kitlog logging
- service.
-
- ----------------------------------------------------------------------
- Kitlog:srds.ps.Z
-
- Kitlog: a Generic Logging Service
-
- Michel Ruffin
- 11th Symp. on Reliable Dist. Systems (SRDS), Houston TX (USA), Oct 1992.
-
- A generic logging service should cater to the variable and even
- antagonistic needs of clients, without imposing unnecessary overhead on
- clients that do not use all of its functions. Kitlog provides an original
- solution to this problem by decomposing logging characteristics into five
- mechanisms: buffering policy, distribution of records, replication of
- records, sharing of logs, and management of physical media. Each
- characteristic is embodied in a class. For each class, multiple policy
- implementations can be provided. Instances of these classes are stackable
- in any appropriate number or order. A client customizes his log, to a
- particular set of failure assumptions, by selecting adequate classes,
- instantiating them, and connecting the instances together.
-
- ----------------------------------------------------------------------
- FI:usenixWinter93.ps.Z
-
- Fault Interpretation: Fine-Grain Monitoring of Page Accesses
-
- Daniel R. Edelson
-
- ABSTRACT
-
- This paper presents a technique for obtaining fine-grain information about
- page accesses from standard virtual memory hardware and Unix operating
- system software. This can be used to monitor all user-mode accesses to
- specified regions of the address space of a process. Application code can
- intervene before and/or after an access occurs, permitting a wide variety
- of semantics to be associated with memory pages. The technique facilitates
- implementing complex replication or consistency protocols on transparent
- distributed shared memory and persistent memory. The technique can also
- improve the efficiency of certain generational and incremental garbage
- collection algorithms. This paper presents our implementation and suggest
- several others. Efficiency measurements show faults to be about three
- orders of magnitude more expensive than normal memory accesses, but two
- orders of magnitude less expensive than page faults. Information about how
- to obtain the code via anonymous ftp appears at the end of the paper.
-
- ----------------------------------------------------------------------
- GFOSFDSS:iwooos92.ps.Z
-
- A Generic Fragmented Object Structured Framework for
- Distributed Storage Support
-
- Herv\'e Soulard, Mesaac Makpangou
- 3d Int. Workshop on Object-Orientation in Operating Systems
- Dourdan, France, Sept. 1992.
-
- ABSTRACT
-
- We propose a generic framework for storage support in a distributed
- environment. This comprises a set of storage abstractions and storage
- policies: data clusters, cluster containers, and container domains,
- supporting sharing, caching, and replication. These abstractions and these
- policies are structured as fragmented objects (FOs), such that each storage
- system designer can offer the appropriate tradeoffs to its targeted
- applications. The core set of abstractions is discussed, their interfaces
- are presented, and the FO-structuring of the cluster abstraction is
- detailed.
-
- ----------------------------------------------------------------------
- RFOM:iwooos92.ps.Z
-
- A Refinement of the Fragmented Object Model
-
- Peter Dickman, Mesaac Makpangou
- 3d Int. Workshop on Object-Orientation in Operating Systems
- Dourdan, France, Sept. 1992.
-
- ABSTRACT
-
- Fragmented Objects offer an interesting alternative to the use of uniform
- transparent object references in distributed systems. This novel paradigm
- for distributed programming provides facilities for the encapsulation of
- policy issues, as well as implementation details such as communication
- mechanisms and consistency requirements. At the same time a clean and
- comprehensible model is offered to both FO designers and client
- programmers. A number of omissions in earlier papers on this topic are
- rectified here, and certain mechanisms are generalised to increase both the
- power and the expressiveness of the model. In particular, FO interfaces
- are extended to include upcalls and a new internal model, based on the
- fragment factory, is introduced.
-
- ----------------------------------------------------------------------
- DGCOOS:iwooos92.ps.Z
-
- A Distributed GC for Object Oriented Systems
-
- David Plainfoss\'e, Marc Shapiro
- 3d Int. Workshop on Object-Orientation in Operating Systems
- Dourdan, France, Sept. 1992.
-
- ABSTRACT
-
- We describe a distributed garbage collector protocol targeted for
- uncooperative distributed object oriented systems. The protocol has been
- implemented on distributed Lisp system and a few performance measurements
- are discussed. Since this implementation, we have refined deeply the
- protocol to address non FIFO channels. A new reference model is proposed
- along with the protocol to improve invocation efficiency.
-
- ----------------------------------------------------------------------
- IRCL:iwooos92.ps.Z
-
- Implementing References as Chains of Links
-
- Julien Maisonneuve, Marc Shapiro, Pierre Collet
- 3d Int. Workshop on Object-Orientation in Operating Systems
- Dourdan, France, Sept. 1992.
-
- ABSTRACT
-
- The goal of this work is to provide uniform transparent access to objects,
- be they local, remote, persistent, or mobile. In this way, we facilitate
- distributed programming and persistence management.
-
- An object (the {\em target}) is accessed through a {\em reference}. A
- reference retains its meaning as it is copied, stored, passed in messages,
- and as the target migrates. A reference is used to invoke a procedure (or
- {\em method}) of the target object. References support standard
- single-space targets, as well as fragmented objects. The cost of using a
- reference to a local object is comparable to the cost of accessing the
- object through a pointer. In the implementation, a reference is a {\em
- chain\/} of {\em links}. Each link embodies a small piece of
- functionality. A chain may be composed of an arbitrary number of links.
-
- ----------------------------------------------------------------------
- PC++GC:iwmm92.ps.Z
-
- Precompiling C++ for Garbage Collection
-
- Daniel Edelson
- Int. Workshop on Memory Management, Saint-Malo (France) sept. 1992.
-
- ABSTRACT
-
- Our research is concerned with compiler-independent, efficient and
- convenient garbage collection for C++. Most collectors proposed for C++
- have either been implemented in a library or in a compiler. As an
- intermediate step between those two, this paper proposes using
- precompilation techniques to augment a C++ source program with code to
- allow mostly type-accurate garbage collection. There are two key
- precompiler transformations. The first is automatic generation of {\em
- smart pointer\/} classes. The precompiler defines the smart pointer
- classes and the user utilizes them instead of raw pointers. These smart
- pointers supply functionality that allows the collector to locate the root
- set for collection. The second transformation augments the C++ program
- with code that allows the garbage collector to locate internal pointers
- within objects. This paper describes the precompiler and the garbage
- collector. The paper includes a brief (1500 word) survey of related
- techniques.
-
- ----------------------------------------------------------------------
- EFTGC:iwmm92.ps.Z
-
- Experience with a Fault-Tolerant Garbage Collector
- in a Distributed Lisp System
-
- David Plainfoss\'e, Marc Shapiro
- Int. Workshop on Memory Management, Saint-Malo (France) sept. 1992.
-
- ABSTRACT
-
- In order to evaluate our fault-tolerant distributed garbage collection
- protocol, we have built a prototype implementation within a distributed
- Lisp system, {\em Transpive}, replacing Piquer's native indirect reference
- count distributed garbage collector. This paper presents our protocol and
- highlights implementation issues on Transpive. In particular, we describe
- the prototype and the alterations required to fit into the Transpive
- distributed programming model. The message and CPU performance of our
- protocol are measured and its fault-tolerance evaluated. We conclude that
- the cost of our protocol is close to Piquers's, although our protocol has
- greater functionality.
-
- ----------------------------------------------------------------------
- SPC++:usenixC++92.ps.Z
-
- Smart Pointers: They're Smart, but They're Not Pointers
-
- Daniel Edelson
- Usenix C++ Conf., Portland OR (USA), aug. 1992.
-
- ABSTRACT
-
- There are numerous times when a C++ user could benefit from a pointer
- variant that has more functionality than is provided by the basic,
- language-defined pointer. For example, type-accurate garbage collection,
- reference counting, or transparent references to distributed or persistent
- objects, might be implemented with classes that provide pointer
- functionality. The C++ language directly supports one kind of pointer
- substitute, the smart pointer, in the form of overloadable indirection
- operators: -> and *.
-
- In this paper we evaluate how {\em seamlessly\/} smart pointers can replace
- raw pointers. The ideal is for client code not to care whether it is using
- raw pointers or smart pointers. For example, if a typedef selects whether
- raw or smart pointers are used throughout the program, changing the value
- of the typedef should not introduce syntax errors.
-
- Unfortunately, C++ does not support pointer substitutes well enough to
- permit seamless integration. This paper presents the desired behavior of
- smart pointers in terms of the semantics of raw pointers that the smart
- pointers try to emulate. Then, we describe several ways of implementing
- smart pointers. For each, we show cases in which the smart-pointers fail to
- behave like raw pointers. From among the choices, we explain which is the
- best for emulating the standard pointer conversions.
-
- Accessors are similar to smart pointers, but have certain advantages. This
- paper discusses the differences between accessors and smart pointers, and
- shows why our conclusions about type conversion behavior also apply to
- accessors. Whether a programmer prefers smart pointers or accessors, this
- paper shows the limitations and recommends an implementation.
-
- ======================================================================
-
- The end.
- ===========================================================================
- Co-moderator: Richard Golding, Computer & Information Sciences, UC Santa Cruz
- compdoc-techreports-request@ftp.cse.ucsc.edu
-
-
-