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>
Cc: pgsql-hackers@postgresql.org, pgsql-hackers-owner@postgresql.org, Rafia Sabih <rafia.sabih@enterprisedb.com>, Robert Haas <robertmhaas@gmail.com>
Date: 2017-11-06T15:47:22Z
Lists: pgsql-hackers 
Hi,

Please don't top-quote on postgresql lists.

On 2017-11-06 09:44:24 -0600, Jim Van Fleet wrote:
> > >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?

> correct

In that case, could you provide before/after profiles of the performance
changing runs?

Greetings,

Andres Freund

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.