* Austin Clements <amdragon@MIT.EDU> [2014-07-24 10:32:14-0400]
> Hi Dmitry.  My guess is that's you've exceeded your OS buffer cache
> size by enough that most B-tree reads are going to disk at least once.
> How big is your database (du -h $MAIL/.notmuch/xapian) and what does
> free -h report on that computer?  Also, is this on an SSD or an HDD?

13Gb on HDD, 9G after compact. Compact did not improved indexing speed,
unfortunately. Maybe it is possible to somehow merge databases?

             total       used       free     shared    buffers     cached
Mem:          7,7G       6,5G       1,2G       240M       826M       3,6G
-/+ buffers/cache:       2,1G       5,6G
Swap:         1,9G        66M       1,8G

--
Best regards, Dmitry Bogatov <KAction@gnu.org>,
Free Software supporter, esperantisto and netiquette guardian.
GPG: 54B7F00D