April 2025
Intermediate to advanced
450 pages
14h 46m
Italian
Content preview from Prestazioni Java, 2a edizione
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Capitolo 9. Prestazioni del threading e della sincronizzazione
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Fin dai suoi esordi, Java ha esercitato un certo fascino grazie alla sua capacità di essere multithread. Anche nei tempi in cui i sistemi multicore e multi-CPU erano la norma, la possibilità di scrivere facilmente programmi con thread in Java è stata considerata una delle sue caratteristiche principali.
In termini di prestazioni, l'attrattiva è ovvia: se sono disponibili due CPU, un'applicazione potrebbe essere in grado di svolgere il doppio del lavoro o la stessa quantità di lavoro due volte più velocemente. Questo presuppone che il compito possa essere suddiviso in segmenti discreti, poiché Java non è un linguaggio autoparallelizzante che si occupa delle parti algoritmiche. Fortunatamente, oggi l'informatica è spesso costituita da compiti discreti: un server che gestisce richieste simultanee da client discreti, un lavoro batch che esegue la stessa operazione su una serie di dati, algoritmi matematici che si suddividono in parti costitutive e così via.
Questo capitolo spiega come ottenere le massime prestazioni dalle strutture di threading e sincronizzazione di Java.
Filettatura e hardware
Ricordiamo la discussione del Capitolo 1 sui sistemi multicore e sui sistemi hyper-thread. Il threading a livello software ci permette di sfruttare i core multipli e gli hyper-thread di una ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.