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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: Thomas Munro <thomas.munro@gmail.com>
Cc: Andrew Dunstan <andrew.dunstan@2ndquadrant.com>
Cc: Mark Wong <mark@2ndquadrant.com>
Cc: Justin Pryzby <pryzby@telsasoft.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: stress test for parallel workers
Date: Sun, 13 Oct 2019 10:29:45 -0400
Message-ID: <32038.1570976985@sss.pgh.pa.us> (raw)
In-Reply-To: <20191013133154.fyxrkcbf4zpwrmtt@alap3.anarazel.de>
References: <84813a30-8c34-9c32-7ad5-90d9eefba468@2ndQuadrant.com>
	<06d6be5a-7af2-ef78-0abc-6bfe500ead87@2ndQuadrant.com>
	<20032.1570808731@sss.pgh.pa.us>
	<14878.1570820201@sss.pgh.pa.us>
	<CA+hUKGKNgufn12Uh4iEh5y=JkEnUBWnLLmi8L4zwzMunFeKwSA@mail.gmail.com>
	<18266.1570824826@sss.pgh.pa.us>
	<21051.1570828384@sss.pgh.pa.us>
	<17884.1570915552@sss.pgh.pa.us>
	<25033.1570925192@sss.pgh.pa.us>
	<CA+hUKGLZh8_Js04nd1-z4_awZyTT-2nzHPxuztn1ApuTS_r=Ow@mail.gmail.com>
	<20191013133154.fyxrkcbf4zpwrmtt@alap3.anarazel.de>

Andres Freund <andres@anarazel.de> writes:
> Probably requires reproducing on a pretty recent kernel first, to have a
> decent chance of being investigated...

How recent do you think it needs to be?  The machine I was testing on
yesterday is under a year old:

uname -m = ppc64le
uname -r = 4.18.19-100.fc27.ppc64le
uname -s = Linux
uname -v = #1 SMP Wed Nov 14 21:53:32 UTC 2018

The latest-by-version-number ppc64 kernel I can find in the buildfarm
is bonito,

uname -m = ppc64le
uname -r = 4.19.15-300.fc29.ppc64le
uname -s = Linux
uname -v = #1 SMP Mon Jan 14 16:21:04 UTC 2019

and that's certainly shown it too.

			regards, tom lane





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