Github user michaelkamprath commented on the issue:
https://github.com/apache/spark/pull/16403
I've refactored this issue's solution using the idea that @kiszk supplied
above. This ended up being a better idea, thanks. It produced cleaner code than
my original allocated buffer approach. Also, based on the input that this
solution should have zero impact on the x86 platform, I've refactored to a
functor design pattern which creates the equivalent performance behavior for
x86 as before this fix.
The performance impact of the using an intermediate long as a buffer when
fetching a double from a memory block looks to be about 10%. I ran some
performance tests writing and reading random doubles to random aligned
locations in a buffer 100M times over. On my mac laptop and an ARM unit, the
performance difference was the long-buffered approach was about 10% slower than
the original direct fetch approach. However, since the this refactor isolates
the fetching behavior into a functor, the 10% slowdown only affects the ARM
platform.
I also added some unit tests if only to convince myself I hadn't broken
anything.
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