| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Mithun Cy <mithun(dot)cy(at)enterprisedb(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Possible performance regression in version 10.1 with pgbench read-write tests. |
| Date: | 2018-07-20 04:15:07 |
| Message-ID: | 16607.1532060107@sss.pgh.pa.us |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Andres Freund <andres(at)anarazel(dot)de> writes:
> I'm a bit hesitant to just revert without further evaluation - it's just
> about as likely we'll regress on other hardware / kernel
> versions.
I looked into the archives for the discussion that led up to ecb0d20a9,
and found it here:
https://www.postgresql.org/message-id/flat/8536.1475704230%40sss.pgh.pa.us
The test cases I tried in that thread said that POSIX semas were *faster*
... by single-digit percentages, but still faster. So I think we really
need to study this issue, rather than just take one contrary result as
being gospel.
regards, tom lane
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Michael Paquier | 2018-07-20 04:25:20 | Re: [HACKERS] Restricting maximum keep segments by repslots |
| Previous Message | Mithun Cy | 2018-07-20 03:03:02 | Re: Possible performance regression in version 10.1 with pgbench read-write tests. |