[GitHub] [lucene-solr] jpountz commented on pull request #2176: Initial rewrite of MMapDirectory for JDK-16 preview (incubating) PANAMA APIs

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jpountz commented on pull request #2176:
URL: https://github.com/apache/lucene-solr/pull/2176#issuecomment-753490290


   > In future we should throw away on coping/loading our stuff to heap and maybe throw away IndexInput completely and base our code fully on random access. The new foreign-vector APIs will in future also be written with MemorySegment in its focus. So you can allocate a vector view on a MemorySegment and let the vectorizer fully work outside java heap inside our mmapped files! :-)
   
   +1 Things work like they do today because auto-vectorization only works on on-heap arrays, and this readLELongs method was the fastest way to copy data from a directory to a long[]. @msokolov and I were just discussing a few days ago how this vector API might help drop the copy entirely in the future, which would be great.
   
   


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