Re: pgsql: Add parallel-aware hash joins.

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>
Cc: Andres Freund <andres(at)anarazel(dot)de>, pgsql-committers <pgsql-committers(at)postgresql(dot)org>
Subject: Re: pgsql: Add parallel-aware hash joins.
Date: 2018-01-22 23:53:10
Message-ID: 24384.1516665190@sss.pgh.pa.us
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I wrote:
> Anyway, it looks like we should write off these longfin timings as
> ambient noise :-(

Here's a possibly more useful graph of regression test timings over
the last year. I pulled this from the buildfarm database: it is the
reported runtime for the "installcheck-C" step in each successful
build of HEAD on dromedary, going back to Jan. 2017. I picked dromedary
because I know that that machine hasn't gotten any software updates
nor is there anything else very interesting going on on it. I dropped
three or four obvious outlier reports (possibly those ran during the
machine's nightly backup cron job). The reported runtime is only
precise to 1s, and a couple seconds jitter is hardly surprising, so
there's a good deal of noise. Still, it's possible to discern when
I put some effort into test runtime reduction back in April, and
it can be seen that things have gotten notably slower since the
beginning of November.

regards, tom lane

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