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How huge does mvtest_huge need to be?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Kevin Grittner <kgrittn(at)gmail(dot)com>
Cc: pgsql-hackers(at)postgreSQL(dot)org
Subject: How huge does mvtest_huge need to be?
Date: 2017-05-03 17:08:40
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Continuing to investigate possible speedups of the regression tests,
I noticed that some of the slower individual statements are those
dealing with mvtest_huge and mvtest_hugeview in matview.sql.
Cutting the size of mvtest_huge from 100K rows to 10K rows is enough
to halve the overall runtime of matview.sql, at least on the relatively
slow buildfarm animal I was checking this on.

I was going to propose doing that, but then looking at commit b69ec7cc9
which introduced these tables, I began to wonder why they're large at all.
Even a one-row matview would have been enough to test for the bug that
that commit fixed.

So ... is there a good reason to be using a large table here, and
if so what is it, and how big does the table really need to be
to provide useful test coverage?

			regards, tom lane


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