Dependence analysisIn compiler theory, dependence analysis produces execution-order constraints between statements/instructions. Broadly speaking, a statement S2 depends on S1 if S1 must be executed before S2. Broadly, there are two classes of dependencies--control dependencies and data dependencies. Dependence analysis determines whether it is safe to reorder or parallelize statements. Control dependency is a situation in which a program instruction executes if the previous instruction evaluates in a way that allows its execution.
XeonUn microprocesseur Xeon est un microprocesseur fabriqué par Intel dont le jeu d'instructions est x86 et conçu pour les stations de travail et les serveurs informatiques. Le nom « Xeon » est une marque commerciale apparue le pour les Pentium . D'abord utilisée en association avec la marque Pentium (Pentium Xeon, Pentium Xeon), elle a été utilisée seule à partir du Pentium 4 (Xeon 1.4, Xeon 3040, etc.). Les versions Xeon tirent généralement leurs performances supérieures d'une mémoire cache plus grande que les versions grand public des microprocesseurs d'Intel.
Synchronization (alternating current)In an alternating current (AC) electric power system, synchronization is the process of matching the frequency and phase and voltage of a generator or other source to an electrical grid in order to transfer power. If two unconnected segments of a grid are to be connected to each other, they cannot safely exchange AC power until they are synchronized. A direct current (DC) generator can be connected to a power network simply by adjusting its open-circuit terminal voltage to match the network's voltage, by either adjusting its speed or its field excitation.
Asynchrony (computer programming)Asynchrony, in computer programming, refers to the occurrence of events independent of the main program flow and ways to deal with such events. These may be "outside" events such as the arrival of signals, or actions instigated by a program that take place concurrently with program execution, without the program blocking to wait for results. Asynchronous input/output is an example of the latter case of asynchrony, and lets programs issue commands to storage or network devices that service these requests while the processor continues executing the program.
Darwin (informatique)Darwin est un système d'exploitation libre et gratuit construit autour du noyau XNU et développé notamment par Apple. Il est dérivé de NeXTSTEP et de BSD. Sa vocation principale est de servir de base au système d'exploitation macOS. Il est distribué sous licence APSL (Apple Public Source License), certifiée libre par la FSF. Par défaut et contrairement à macOS, Darwin ne contient pas de moteur graphique Quartz ni d'interface Aqua. Il fournit initialement une invite de commande en mode texte.
