April 2025
Intermediate to advanced
450 pages
14h 9m
Portuguese (Portugal, Brazil)
Content preview from Desempenho do Java, 2ª Edição
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Capítulo 9. Desempenho de Threading e Sincronização
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Desde os seus primeiros dias, parte do apelo do Java tem sido o facto de ser multithread. Mesmo antes de os sistemas multicore e multi-CPU serem a norma, a capacidade de escrever facilmente programas com threads em Java foi considerada uma das suas caraterísticas distintivas.
Em termos de desempenho, o apelo é óbvio: se duas CPUs estiverem disponíveis, uma aplicação pode ser capaz de fazer o dobro do trabalho ou a mesma quantidade de trabalho duas vezes mais rápido. Isto pressupõe que a tarefa pode ser dividida em segmentos discretos, uma vez que Java não é uma linguagem de autoparalelização que irá resolver as partes algorítmicas. Felizmente, hoje em dia, a computação é frequentemente constituída por tarefas discretas: um servidor que lida com pedidos simultâneos de clientes discretos, um trabalho em lote que executa a mesma operação numa série de dados, algoritmos matemáticos que se dividem em partes constituintes, etc.
Este capítulo explora como obter o máximo desempenho dos recursos de thread e sincronização do Java.
Threading e Hardware
Relembra a discussão do Capítulo 1 sobre sistemas multicore e sistemas hyper-threaded. Threading a nível de software permite-nos tirar partido dos múltiplos núcleos e hyper-threads de uma máquina.
Duplicar os núcleos de uma máquina permite-nos duplicar o desempenho da nossa ...
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