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From Toke Eskildsen ...@statsbiblioteket.dk>
Subject Re: Pressed optimize and now SOLR is not indexing while optimize is going on
Date Wed, 07 Oct 2015 10:40:40 GMT
On Wed, 2015-10-07 at 07:03 -0300, Eric Torti wrote:
> I'm sorry to diverge this thread a little bit. But could please point me to
> resources that explain deeply how this process of OS using the non-java
> memory to cache index data?

http://blog.thetaphi.de/2012/07/use-lucenes-mmapdirectory-on-64bit.html

Shawn Heisey:
> > Whatever RAM is left over after you give 12GB to Java for Solr will be
> > used automatically by the operating system to cache index data on the
> > disk.  Solr is completely reliant on that caching for good performance.
> 
> I'm puzzled as to why the physical memory of solr's host machine is always
> used up and I think some resources on that would help me understand it.

It is not used up as such: Add "Disk cache" and "Free space" (or
whatever your monitoring tool calls them) and you will have the amount
of memory available for new processes. If you start a new and
memory-hungry process, it will take the memory from the free pool first,
then from the disk cache.


- Toke Eskildsen, State and University Library, Denmark



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