1,721,044 research outputs found
Lucretia as a Figure of Mary in Machiavelli’s Mandragola
Full text linkWhen studied in political and ideological contexts, the numerous references to the Virgin Mary in Machiavelli’s comedic masterpiece Mandragola enable us to see how the author not only parodies a sacred play, but also deftly repurposes Christological and Mariological symbolism to celebrate his work’s unnamed referent: the first Medici pope, Leo X
Architettura dei calcolatori Volume II. Struttura del processore, del bus, della memoria e delle interfacce, e gestione dell'I/0. Con riferimento al personal computer e a un ambiente di programmazione basato sul DJGPP
No full textIn questo volume viene descritta l’architettura di un calcolatore basato sul processore PC (software compatibile con i processori a 32 bit presenti nei Personal Computer), utilizzando il controllore APIC, il bus PCI e il meccanismo di bus-mastering. Vengono descritte le tipiche interfacce di I/O, sia a byte che a blocchi. Vengono infine presentate le attuali tecniche di organizzazione interna del processore
Architettura dei Calcolatori Volume III - Aspetti architetturali avanzati e nucleo di Sistema operativo con riferimento al personal computer, all’ambiente di programmazione e ad un nucleo funzionante basato sul DJGPP
No full textIn questo volume viene utilizzato il processore PC (software compatibile con i processori presenti nei Personal Computer) anzitutto per trattare tematiche avanzate, con riferimento a sistemi effettivamente esistenti e largamente diffusi.
Sempre utilizzando il processore PC, viene descritto un nucleo di sistema operativo che consente di illustrare gli aspetti di interfaccia tra hardware e software, verificando sperimentalmente le funzionalità dei costrutti software basilari
On the Impact of Memory Safety on Fast Network I/O
No full textRust is a multi-paradigm, general-purpose programming language that prioritizes performance, type safety, and fearless concurrency. At compile time, Rust is able to ensure memory and thread safety without relying on automated memory management techniques such as garbage collection. As a result, Rust is gaining significant popularity as a replacement for C/C++ in various domains where performance and reliability are paramount, such as systems programming, embedded devices, and networking.This paper attempts to critically evaluate the claims of high performance and memory safety associated with Rust, particularly in the context of low-level network programming. The approach involves rewriting Nethuns, a fast C-based network I/O library, using Rust. The Rust-based implementation of Nethuns is described in detail in this work, with a particular emphasis on explaining the design choices, highlighting the primary benefits gained in terms of safety and security, and addressing the challenges encountered throughout the process. The paper concludes with a performance evaluation of the library.The obtained results are promising: the Rust-based library ensures a significantly higher level of safety at compile time, with a modest performance trade-off
Improving live migration efficiency in QEMU: An eBPF-based paravirtualized approach
No full textVirtual Machines are the key technology in cloud computing. In order to upgrade, repair or service the physical machine where a Virtual Machine is hosted, a common practice is to live-migrate the Virtual Machine to a different server. This involves copying all the guest memory over the network, which may take a non-negligible amount of time. In this work, we propose a technique to speed up the migration time by reducing the amount of guest memory to be transferred with the help of the guest OS. In particular, during live-migration, an eBPF program is injected in the guest kernel to obtain, and send to the Virtual Machine Monitor, the list of guest page frames that are currently unused. The VMM can then safely skip these pages during the copy. We have integrated this technique in the live-migration implementation of QEMU (Bellard, 2005), and we show the effects of our work in some experiments comparing the results against the QEMU default implementation
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
The profile of a health care manager according to the World Health Organization standards and guidelines.
No full textMind the cost of telemetry data analysis
No full textData Stream Processing engines are emerging as a promising solution to efficiently process a continuous amount of telemetry information. In this poster, we compare four of them: Storm, Flink, Spark and WindFlow. The aim is to shed some lights on the best streaming engine for network traffic analysis
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