Yes. This is still accurate, Lucene still relies on memory mapped files. And
Solr usually doesn't require that much RAM, except if you have lots of massive
cache entries.
Markus
-----Original message-----
> From:Kelly, Frank <frank.ke...@here.com>
> Sent: Wednesday 9th December 2015 16:19
> To: solr-user@lucene.apache.org
> Subject: Solr Heap memory vs. OS memory
>
> Hi Folks,
>
> I was wondering if this link I found recommended by Erick is still accurate
> (for Solr 5.3.1)
>
> "For configuring your Java VM, you should rethink your memory requirements:
> Give only the really needed amount of heap space and leave as much as
> possible to the O/S. As a rule of thumb: Don't use more than 1Z4 of your
> physical memory as heap space for Java running Lucene/Solr, keep the
> remaining memory free for the operating system cache."
>
> http://blog.thetaphi.de/2012/07/use-lucenes-mmapdirectory-on-64bit.html
>
> So I am using several CentOS Vms (on AWS) with 8GB RAM I so should plan for <
> 2GB for -Xms and -Xmx?
> Our scaling plan - being on AWS - is to scale out (adding more Vms - not
> adding more memory).
>
> Thanks!
>
> -Frank
>
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