Very helpful link. Thanks for sharing that.
-Deepak On Wed, Sep 11, 2013 at 4:34 PM, Shawn Heisey <s...@elyograg.org> wrote: > On 9/11/2013 4:16 PM, Deepak Konidena wrote: > >> As far as RAM usage goes, I believe we set the heap size to about 40% of >> the RAM and less than 10% is available for OS caching ( since replica >> takes >> another 40%). Why does unallocated RAM help? How does it impact >> performance >> under load? >> > > Because once the data is in the OS disk cache, reading it becomes > instantaneous, it doesn't need to go out to the disk. Disks are glacial > compared to RAM. Even SSD has a far slower response time. Any recent > operating system does this automatically, including the one from Redmond > that we all love to hate. > > http://blog.thetaphi.de/2012/**07/use-lucenes-mmapdirectory-** > on-64bit.html<http://blog.thetaphi.de/2012/07/use-lucenes-mmapdirectory-on-64bit.html> > > Thanks, > Shawn > >
