Oh JMH is a good idea, I'll try that, thanks On Wed, Dec 30, 2020 at 10:31 AM Robert Muir <rcm...@gmail.com> wrote: > > Can you boil this down to a microbenchmark (e.g. JMH) so you can look > at assembly? > > Maybe with on-heap, the dot product is getting vectorized, but with > off-heap/unsafe it is not. > e.g. something like this recent bug: > https://bugs.openjdk.java.net/browse/JDK-8257531 > > You could re-run your bench on a JDK-16 early access as well, with > that fix, and see what happens. > > On Wed, Dec 30, 2020 at 9:00 AM Michael Sokolov <msoko...@gmail.com> wrote: > > > > Hi, I've been working on improving performance of vector KNN search, > > and found some behavior that seemed surprising to me, showing huge > > differences in some cases comparing on-heap memory access with the way > > we access data today via IndexInput. I'd love to get some other eyes > > on this to help me better understand the difference, and whether it's > > significant in reality or just an oddity that only turns up in a > > microbenchmark. Thanks for taking a look (note: I don't plan to commit > > the attached PR, it's just posted to show how the measurements were > > done) > > > > https://github.com/apache/lucene-solr/pull/2173 > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org > > For additional commands, e-mail: dev-h...@lucene.apache.org > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org > For additional commands, e-mail: dev-h...@lucene.apache.org >
--------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org
