Thanks! On Wed, 21 May 2025 at 23:35, Adrien Grand <jpou...@gmail.com> wrote:
> Hello Ashwini, > > MMapDirectory will often perform a bit faster. While NIOFSDirectory needs > to first copy data from the buffer cache to heap arrays, MMapDirectory can > read directly into the buffer cache. > > Lucene's benchmark suite allows comparing these two directories. I haven't > done so recently, but in my experience MMapDirectory was always faster. > > I recommend reading this blog to learn more: > https://blog.thetaphi.de/2012/07/use-lucenes-mmapdirectory-on-64bit.html > > Le jeu. 22 mai 2025, 07:47, ashwini singh <ashwini.mn...@gmail.com> a > écrit : > > > As per Lucene documentation there is not much difference between these 2 > > implementations and users should use the Open() method and Lucene choses > > the best implementation based on the system. > > > > > > > https://lucene.apache.org/core/9_7_0/core/org/apache/lucene/store/FSDirectory.html > > > > > > Is there any perf impact on choosing one of the options on a 64 bit linux > > system ? Do we have any comparison numbers? What is the advantage of > using > > MMapDirectory when we already have a system buffer cache (on linux) for > > file access ? > > > > > > Thanks > > Ashwini > > > -- *Thanks and Regards,* *Ashwini Singh*
