Re: Quick way to initialize array with all zeros
Mark Thornton wrote:
Arne Vajh?j wrote:
Patricia Shanahan wrote:
"trustTheJVM" is the clear winner, and should be used unless there is a
need to reinitialize the array after it has been modified.
For small arrays, if reinitialization is needed, "loop" wins over "fill"
by a reasonable margin.
For large arrays, "loop" and "fill" have similar performance.
No surprise since Arrays.fill use the same loop but
has a couple of extra calls.
Just because the code looks the same does not mean it will have the same
performance when one implementation is part of the standard library. The
JVM might replace library implementations with an accelerated form
(intrinsic).
And ?
I would still be more surprised if it did that than if it did not.
Thus Patricia is correct to test the actual performance of
these methods, and that performance might change in a future JVM.
And ?
Java and all other languages I am aware of does not make any promises
about future performance characteristics.
Arne
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