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From Shawn Heisey <>
Subject Re: Approximately needed RAM for 5000 query/second at a Solr machine?
Date Wed, 10 Apr 2013 04:23:19 GMT
On 4/9/2013 9:12 PM, Furkan KAMACI wrote:
> I am sorry but you said:
> *you need enough free RAM for the OS to cache the maximum amount of disk
> space all your indexes will ever use*
> I have made an assumption my indexes at my machine. Let's assume that it is
> 5 GB. So it is better to have at least 5 GB RAM? OK, Solr will use RAM up
> to how much I define it as a Java processes. When we think about the
> indexes at storage and caching them at RAM by OS, is that what you talk
> about: having more than 5 GB - or - 10 GB RAM for my machine?

If your index is 5GB, and you give 3GB of RAM to the Solr JVM, then you
would want at least 8GB of total RAM for that machine - the 3GB of RAM
given to Solr, plus the rest so the OS can cache the index in RAM.  If
you plan for double the cache memory, you'd need 13 to 14GB.


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