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Singleton and performance

Hi: I have a multi-threaded Java program. There are many loners. I am wondering if singleton will reduce the performance of a multi-threaded program, especially bandwidth. Some Singletons are just one object, some singletons are concurrentHashmap and / or atomicinteger.

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If your singletones are unchanged, they will not lead to a decrease in performance.

However, as you said, if your code has parallel ( synchronized) data structure syntaxes, then your performance will decrease compared to non-competitive data structures.

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