Re: Parallel tuplesort (for parallel B-Tree index creation)

From: Peter Geoghegan <pg(at)bowt(dot)ie>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>, Corey Huinker <corey(dot)huinker(at)gmail(dot)com>
Subject: Re: Parallel tuplesort (for parallel B-Tree index creation)
Date: 2017-03-20 01:03:51
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On Sun, Mar 12, 2017 at 3:05 PM, Peter Geoghegan <pg(at)bowt(dot)ie> wrote:
> I attach my V9 of the patch. I came up some stuff for the design of
> resource management that I think meets every design goal that we have
> for shared/unified BufFiles:

Commit 2609e91fc broke the parallel CREATE INDEX cost model. I should
now pass -1 as the index block argument to compute_parallel_worker(),
just as all callers that aren't parallel index scan do after that
commit. This issue caused V9 to never choose parallel CREATE INDEX
within nbtsort.c. There was also a small amount of bitrot.

Attached V10 fixes this regression. I also couldn't resist adding a
few new assertions that I thought were worth having to buffile.c, plus
dedicated wait events for parallel tuplesort. And, I fixed a silly bug
added in V9 around where worker_wait() should occur.

Peter Geoghegan

Attachment Content-Type Size
0001-Add-parallel-B-tree-index-build-sorting.patch.gz application/x-gzip 56.0 KB
0002-Add-temporary-testing-tools.patch.gz application/x-gzip 4.7 KB

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