On 19-Nov-08, at 5:12 AM, Michael McCandless (JIRA) wrote:
>
> How can the VM system possibly make good decisions about what to swap
> out?  It can't know if a page is being used for terms dict index,
> terms dict, norms, stored fields, postings.  LRU is not a good policy,
> because some pages (terms index) are far far more costly to miss than
> others.

A note on this discussion: we recently re-architected a large database-
y, lucene-y system to use mmap-based storage and are extremely pleased  
with the performance.   Sharing the buffers among processes is rather  
cool, as Marvin mentions, as is the near-instantaneous startup.

-Mike

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