Horton

Re: [POC] Faster processing at Gather node

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: Jim Van Fleet <vanfleet@us.ibm.com>,Robert Haas <robertmhaas@gmail.com>
Cc: PostgreSQL Developers <pgsql-hackers@postgresql.org>,pgsql-hackers-owner@postgresql.org,Rafia Sabih <rafia.sabih@enterprisedb.com>
Date: 2017-11-05T21:40:15Z
Lists: pgsql-hackers 
Hi,

On November 5, 2017 1:33:24 PM PST, Jim Van Fleet <vanfleet@us.ibm.com> wrote:
>Ran this change with hammerdb  on a power 8 firestone
>
>with 2 socket, 20 core
>9.6 base        --  451991 NOPM
>0926_master -- 464385 NOPM
>11_04master -- 449177 NOPM
>11_04_patch -- 431423 NOPM
>-- two socket patch is a little down from previous base runs
>
>With one socket
>9.6 base          -- 393727 NOPM 
>v10rc1_base -- 350958 NOPM
>11_04master -- 306506 NOPM
>11_04_patch -- 313179 NOPM
>--  one socket 11_04 master is quite a bit down from 9.6 and
>v10rc1_base 
>-- the patch is up a bit over the base
>
>Net -- the patch is about the same as current base on two socket, and
>on 
>one socket  -- consistent with your pgbench (?) findings
>
>As an aside, it is perhaps a worry that one socket is down over 20%
>from 
>9.6 and over 10% from v10rc1

What query(s) did you measure?

Andres
-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.

Commits

  1. C comment: fix wording about shared memory message queue

  2. shm_mq: Have the receiver set the sender's less frequently.

  3. shm_mq: Reduce spinlock usage.

  4. Remove use of byte-masking macros in record_image_cmp

  5. Remove memory leak protection from Gather and Gather Merge nodes.

  6. Avoid projecting tuples unnecessarily in Gather and Gather Merge.

  7. Tweak use of ExecContextForcesOids by Gather (Merge).

  8. Pass eflags down to parallel workers.

  9. Disable installcheck tests for test_session_hooks

  10. First-draft release notes for 10.1.

  11. Remove TupleDesc remapping logic from tqueue.c.

  12. Avoid memory leaks when a GatherMerge node is rescanned.

  13. Code review for nodeGatherMerge.c.

  14. Add a Gather Merge executor node.

  15. Push scan/join target list beneath Gather when possible.