Query on Cache size.

[kalidoss <ka...@sifycorp.com>]

Hi,

    We have enabled the query result cache, its 512 entries,

    we have calculated the size used for cache :
        page size about 1000bytes, (1000*512)/1024/1024  = .48MB

    If we increase the cache count to 100000 then the memory used for 
cache about. (1000*100000)/1024/1024 = 96MB

    Is my calculation is correct? my system has 2.5GB of RAM for Solr 
and 1GB for OS.

    If am wrong, let me know how to calculate the memory?

Thanks,
Kalidoss.m,



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Re: Query on Cache size.

[Shalin Shekhar Mangar <sh...@gmail.com>]

On Mon, Dec 14, 2009 at 7:17 PM, kalidoss <
kalidoss.muthuramalingam@sifycorp.com> wrote:

> Hi,
>
>   We have enabled the query result cache, its 512 entries,
>
>   we have calculated the size used for cache :
>       page size about 1000bytes, (1000*512)/1024/1024  = .48MB
>
>
The query result cache is a map of (q, sort, n) to ordered list of Lucene
docids. Assuming queryResultWindowSize iw 20 and an average user does not go
beyond 20 results, your memory usage of the values in this map is
approx 20*sizeof(int)*512. Add some more for keys, map, references etc.

-- 
Regards,
Shalin Shekhar Mangar.