Re: pgbench regression test failure

From: Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: PostgreSQL Developers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: pgbench regression test failure
Date: 2017-09-22 17:55:12
Message-ID: alpine.DEB.2.20.1709221950480.5840@lancre
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> [...] After another week of buildfarm runs, we have a few more cases of
> 3 rows of output, and none of more than 3 or less than 1. So I went
> ahead and pushed your patch. I'm still suspicious of these results, but
> we might as well try to make the buildfarm green pending investigation
> of how this is happening.

Yep. I keep the issue of pgbench tap test determinism in my todo list,
among other things.

I think that it should be at least clearer under which condition (load ?
luck ? bug ?) the result may be 1 or 3 when 2 are expected, which needs
some thinking.

--
Fabien.

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