Embarrassingly parallelIn parallel computing, an embarrassingly parallel workload or problem (also called embarrassingly parallelizable, perfectly parallel, delightfully parallel or pleasingly parallel) is one where little or no effort is needed to separate the problem into a number of parallel tasks. This is often the case where there is little or no dependency or need for communication between those parallel tasks, or for results between them. Thus, these are different from distributed computing problems that need communication between tasks, especially communication of intermediate results.
Free Java implementationsFree Java implementations are software projects that implement Oracle's Java technologies and are distributed under free software licences, making them free software. Sun released most of its Java source code as free software in May 2007, so it can now almost be considered a free Java implementation. Java implementations include compilers, runtimes, class libraries, etc. Advocates of free and open source software refer to free or open source Java virtual machine software as free runtimes or free Java runtimes.
Distributed shared memoryIn computer science, distributed shared memory (DSM) is a form of memory architecture where physically separated memories can be addressed as a single shared address space. The term "shared" does not mean that there is a single centralized memory, but that the address space is shared—i.e., the same physical address on two processors refers to the same location in memory. Distributed global address space (DGAS), is a similar term for a wide class of software and hardware implementations, in which each node of a cluster has access to shared memory in addition to each node's private (i.
Traitement massivement parallèleEn informatique, le traitement massivement parallèle (en anglais, massively parallel processing ou massively parallel computing) est l'utilisation d'un grand nombre de processeurs (ou d'ordinateurs distincts) pour effectuer un ensemble de calculs coordonnés en parallèle (c'est-à-dire simultanément). Différentes approches ont été utilisées pour implanter le traitement massivement parallèle. Dans cette approche, la puissance de calcul d'un grand nombre d'ordinateurs distribués est utilisée de façon opportuniste chaque fois qu'un ordinateur est disponible.
Java syntaxThe syntax of Java is the set of rules defining how a Java program is written and interpreted. The syntax is mostly derived from C and C++. Unlike in C++, in Java there are no global functions or variables, but there are data members which are also regarded as global variables. All code belongs to classes and all values are objects. The only exception is the primitive types, which are not represented by a class instance for performance reasons (though can be automatically converted to objects and vice versa via autoboxing).
Java performanceIn software development, the programming language Java was historically considered slower than the fastest 3rd generation typed languages such as C and C++. The main reason being a different language design, where after compiling, Java programs run on a Java virtual machine (JVM) rather than directly on the computer's processor as native code, as do C and C++ programs. Performance was a matter of concern because much business software has been written in Java after the language quickly became popular in the late 1990s and early 2000s.
Parallélisme de donnéeLe parallélisme par distribution de donnée ou parallélisme de donnée (data parallelism en anglais) est un paradigme de la programmation parallèle. Autrement dit, c'est une manière particulière d'écrire des programmes pour des machines parallèles. Les algorithmes des programmes qui entrent dans cette catégorie cherchent à distribuer les données au sein des processus et à y opérer les mêmes opérations à l'instar des SIMD. Le paradigme opposé est celui du parallélisme de tâche. Catégorie:Programmation concurr
Application (informatique)Une application, un applicatif ou encore une appli, une app est, dans le domaine informatique, un programme (ou un ensemble logiciel) directement utilisé pour réaliser une tâche, ou un ensemble de tâches élémentaires d'un même domaine ou formant un tout. Typiquement, un éditeur de texte, un navigateur web, un lecteur multimédia, un jeu vidéo, sont des applications. Les applications s'exécutent en utilisant les services du système d'exploitation pour utiliser les ressources matérielles.
Mémoire distribuéethumb|Exemple de mémoire distribuée sur trois systèmes La mémoire d'un système informatique multiprocesseur est dite distribuée lorsque la mémoire est répartie en plusieurs nœuds, chaque portion n'étant accessible qu'à certains processeurs. Un réseau de communication relie les différents nœuds, et l'échange de données doit se faire explicitement par « passage de messages ». La mémoire est organisée de cette manière par exemple lorsque l'on utilise des machines indépendantes pour former une grille.
Parallel algorithmIn computer science, a parallel algorithm, as opposed to a traditional serial algorithm, is an algorithm which can do multiple operations in a given time. It has been a tradition of computer science to describe serial algorithms in abstract machine models, often the one known as random-access machine. Similarly, many computer science researchers have used a so-called parallel random-access machine (PRAM) as a parallel abstract machine (shared-memory).
