Horton

Re: [POC] Faster processing at Gather node

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: pgsql-hackers@postgresql.org,Jim Van Fleet <vanfleet@us.ibm.com>
Cc: PostgreSQL Developers <pgsql-hackers@postgresql.org>,pgsql-hackers-owner@postgresql.org,Rafia Sabih <rafia.sabih@enterprisedb.com>,Robert Haas <robertmhaas@gmail.com>
Date: 2017-11-06T15:33:50Z
Lists: pgsql-hackers 

On November 6, 2017 7:30:49 AM PST, Jim Van Fleet <vanfleet@us.ibm.com> wrote:
>Andres Freund <andres@anarazel.de> wrote on 11/05/2017 03:40:15 PM:
>
>hammerdb, in this configuration, runs a variant of tpcc

Hard to believe that any of the changes here are relevant in that case - this is parallelism specific stuff. Whereas tpcc is oltp, right?

Andres
-- 
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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.