Re: POC: make mxidoff 64 bits

From: Maxim Orlov <orlovmg(at)gmail(dot)com>
To: Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>
Cc: Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Alexander Korotkov <aekorotkov(at)gmail(dot)com>, wenhui qiu <qiuwenhuifx(at)gmail(dot)com>, Postgres hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: POC: make mxidoff 64 bits
Date: 2025-12-01 08:53:41
Message-ID: CACG=ezZ1LbA1G+4mQFuDCUbSHdPR3AEzG+frBm_TCQh8-wC8Ng@mail.gmail.com
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On Fri, 28 Nov 2025 at 16:17, Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>
wrote:

> One more thing,
> An UPDATE waits for FOR SHARE query to finish, and vice versa. In my
> experiments I didn't see an UPDATE creating a multi-xact. Why do we
> have UPDATEs in the load created by the test? Am I missing something?

As far as I remember, this was done on purpose to create different
multixact members statuses randomly.

--
Best regards,
Maxim Orlov.

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