RFR(S): 8215483: Off heap memory accesses should be vectorized

Andrew Haley aph at redhat.com
Fri Jan 25 09:33:51 UTC 2019

On 1/24/19 5:50 PM, Vladimir Kozlov wrote:

> Looks good to me too. But it would be nice to have changes
> explanation in RFE. Why it helps vectorize off heap memory accesses?

I don't quite understand what you're asking here, but I guess it's
about what applications need vertorized MappedByteBuffers. Sometimes
people use allocateDirect to get a chunk of memory rather than simply
allocate, and it would be surprising that their programs ran more
slowly as a result. Apache Lucene, for example, is a large-scale user
of ByteBuffers, and they need all the performance they can get.

Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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