Object Swapping Challenges: an Evaluation of ImageSegment

Martinez Peck, Mariano; Bouraqadi, Noury; Ducasse, Stephane; Fabresse, Luc

Document type :

Article dans une revue scientifique: Article original

DOI :

10.1016/j.cl.2011.10.001

Title :

Object Swapping Challenges: an Evaluation of ImageSegment

Author(s) :

Martinez Peck, Mariano [Auteur correspondant]
Analyses and Languages Constructs for Object-Oriented Application Evolution [RMOD]
Bouraqadi, Noury [Auteur]
Centre for Digital Systems [CERI SN - IMT Nord Europe]
Ducasse, Stephane [Auteur]

Analyses and Languages Constructs for Object-Oriented Application Evolution [RMOD]
Fabresse, Luc [Auteur]
Centre for Digital Systems [CERI SN - IMT Nord Europe]

Journal title :

Computer Languages, Systems and Structures

Pages :

1-15

Publisher :

Elsevier

Publication date :

2011-11-29

ISSN :

1477-8424

English keyword(s) :

Object swapping
serialization
ImageSegment
Smalltalk
Object-oriented programming

HAL domain(s) :

Informatique [cs]/Langage de programmation [cs.PL]

English abstract : [en]

In object-oriented systems, runtime memory is composed of an object graph in which objects refer to other objects. This graph of objects evolves while the system is running. Graph exporting and swapping are two important ...
Show more >In object-oriented systems, runtime memory is composed of an object graph in which objects refer to other objects. This graph of objects evolves while the system is running. Graph exporting and swapping are two important object graph operations. Exporting refers to copying the graph to some other memory so that it can be loaded by another system. Swapping refers to moving the graph to a secondary memory (for example, a hard disk) to temporary release part of the primary memory (for example, RAM). Exporting and swapping are achieved in different ways and the speed in presence of large object graphs is critical. Nevertheless, most of the existing solutions do not address well this issue. Another challenge is to deal with common situations where objects outside the exported/swapped graph point to objects inside the graph. To correctly load back an exported subgraph, it is necessary to compute and export extra information that is not explicit in the object subgraph. This extra information is needed because certain objects may require to be reinitialized or recreated, to run specific code before or after the loading, to be updated to a new class definition, etc. In this paper, we present all general problems to our knowledge about object exporting and swapping. As a case of study, we present an analysis of ImageSegment, a fast solution to export and swap object graphs, developed by Dan Ingalls. ImageSegment addresses the speed problems in an efficient way, as shown by the results of several benchmarks we have conducted using Pharo Smalltalk. However, ImageSegment is not a panacea since it still has other problems that hampers its general use.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

Centre de Recherche en Informatique, Signal et Automatique de Lille (CRIStAL) - UMR 9189

Source :

Harvested from HAL

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