| From: | Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com> |
|---|---|
| To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Cc: | Amit Khandekar <amitdkhan(dot)pg(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: why not parallel seq scan for slow functions |
| Date: | 2017-09-19 20:17:50 |
| Message-ID: | CAEepm=1KhZg17t6tNpFZ6pr=ucxa-kF24m9cEASU3cj3g_2zgg@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On Thu, Sep 14, 2017 at 3:19 PM, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> The attached patch fixes both the review comments as discussed above.
This cost stuff looks unstable:
test select_parallel ... FAILED
! Gather (cost=0.00..623882.94 rows=9976 width=8)
Workers Planned: 4
! -> Parallel Seq Scan on tenk1 (cost=0.00..623882.94 rows=2494 width=8)
(3 rows)
drop function costly_func(var1 integer);
--- 112,120 ----
explain select ten, costly_func(ten) from tenk1;
QUERY PLAN
----------------------------------------------------------------------------
! Gather (cost=0.00..625383.00 rows=10000 width=8)
Workers Planned: 4
! -> Parallel Seq Scan on tenk1 (cost=0.00..625383.00 rows=2500 width=8)
(3 rows)
drop function costly_func(var1 integer);
From https://travis-ci.org/postgresql-cfbot/postgresql/builds/277376953 .
--
Thomas Munro
http://www.enterprisedb.com
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Ashwin Agrawal | 2017-09-19 20:23:58 | "inconsistent page found" with checksum and wal_consistency_checking enabled |
| Previous Message | Tom Lane | 2017-09-19 20:16:33 | Re: Show backtrace when tap tests fail |