On Wed, Oct 12, 2016 at 3:21 AM, Dilip Kumar <dilipbal...@gmail.com> wrote: > I think at higher client count from client count 96 onwards contention > on CLogControlLock is clearly visible and which is completely solved > with group lock patch. > > And at lower client count 32,64 contention on CLogControlLock is not > significant hence we can not see any gain with group lock patch. > (though we can see some contention on CLogControlLock is reduced at 64 > clients.)
I agree with these conclusions. I had a chance to talk with Andres this morning at Postgres Vision and based on that conversation I'd like to suggest a couple of additional tests: 1. Repeat this test on x86. In particular, I think you should test on the EnterpriseDB server cthulhu, which is an 8-socket x86 server. 2. Repeat this test with a mixed read-write workload, like -b tpcb-like@1 -b select-only@9 -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
