CODEWITHSUNDEEP
java
gscp
gscp

Reputation: 21

Processor cores and number of threads

Looking for new hardware, I read that "The key improvement to the i7-8750H is in its core count: we’re now looking at 6 cores and 12 threads".

1/ Would Runtime.getRuntime().availableProcessors() return 6 or 12?

2/ In this case, is using a 12 threads parallelism a better idea than using a 6 threads parallelism for a simple task of parallelized calculation?

Thanks

Upvotes: 2

Views: 2338

Answers (1)

Kayaman
Kayaman

Reputation: 73528

Runtime.getRuntime().availableProcessors() would return 12 as the amount of available processors for Java. Java doesn't know that there's only 6 physical cores, and it doesn't really care either (Java does do some tricks that depend on the amount of processors, but that's usually single-CPU vs. multicore).

The best way to know if your code will benefit from increasing parallelism is by testing it. You certainly can't calculate any performance improvements based on just the amount of cores.

Upvotes: 3

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