On 10/12/13 12:14, Heikki Linnakangas wrote:
I took a stab at using posix_fadvise() in ANALYZE. It turned out to be very easy, patch attached. Your mileage may vary, but I'm seeing a nice gain from this on my laptop. Taking a 30000 page sample of a table with 717717 pages (ie. slightly larger than RAM), ANALYZE takes about 6 seconds without the patch, and less than a second with the patch, with effective_io_concurrency=10. If anyone with a good test data set loaded would like to test this and post some numbers, that would be great.
I did a test run: pgbench scale 2000 (pgbench_accounts approx 25GB). postgres 9.4 i7 3.5Ghz Cpu 16GB Ram 500 GB Velociraptor 10K (cold os and pg cache both runs) Without patch: ANALYZE pgbench_accounts 90s With patch: ANALYZE pgbench_accounts 91s So I'm essentially seeing no difference :-( Regards Mark -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
