April 2025
Intermediate to advanced
450 pages
14h 46m
Italian
Content preview from Prestazioni Java, 2a edizione
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Capitolo 7. Migliori pratiche per la memoria Heap
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Nei capitoli 5 e 6 sono stati illustrati i dettagli su come sintonizzare il garbage collector in modo che abbia il minor effetto possibile su un programma. La messa a punto del garbage collector è importante, ma spesso si possono ottenere migliori prestazioni utilizzando migliori pratiche di programmazione. Questo capitolo illustra alcune delle migliori pratiche di utilizzo della memoria heap in Java.
In questo caso abbiamo due obiettivi contrastanti. La prima regola generale è quella di creare oggetti con parsimonia e di scartarli il più velocemente possibile. Utilizzare meno memoria è il modo migliore per migliorare l'efficienza del garbage collector. D'altra parte, ricreare frequentemente alcuni tipi di oggetti può portare a un peggioramento delle prestazioni generali (anche se le prestazioni del GC migliorano). Se invece questi oggetti vengono riutilizzati, i programmi possono ottenere sostanziali guadagni in termini di prestazioni. Gli oggetti possono essere riutilizzati in diversi modi, tra cui variabili thread-local, riferimenti a oggetti speciali e pool di oggetti. Riutilizzare gli oggetti significa che avranno una vita lunga e avranno un impatto sul garbage collector, ma se vengono riutilizzati con criterio, le prestazioni complessive miglioreranno.
In questo capitolo vengono discussi ...
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