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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Ashkil Dighin <ashkildighin76@gmail.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: pgsql-performance@lists.postgresql.org <pgsql-performance@lists.postgresql.org>
Subject: Re: Lock contention high
Date: Mon, 15 Nov 2021 10:25:31 -0500
Message-ID: <2123130.1636989931@sss.pgh.pa.us> (raw)
In-Reply-To: <CAH6zzqBhFXVNKT7T=CbZ65fQS++h6vG3fhewWytWvxPskQHWKA@mail.gmail.com>
References: <CAH6zzqCNtbCDSSFweuZp93R7TOxfEB8f75iosExb6sutyAa-Uw@mail.gmail.com>
	<20211025233546.byihrwehpi4feqv2@alap3.anarazel.de>
	<CAH6zzqDrwOoTMnh=rPBwcK-DA4wuEQGNtZdtLXY+7fXmDXHW9w@mail.gmail.com>
	<2A5AB443-64E5-42DC-936A-C521ADD6B1BD@anarazel.de>
	<CAH6zzqBhFXVNKT7T=CbZ65fQS++h6vG3fhewWytWvxPskQHWKA@mail.gmail.com>

Ashkil Dighin <ashkildighin76@gmail.com> writes:
> I suspect lock contention and performance issues with __int128. And I would
> like to check the performance by forcibly disabling int128(Maxalign16bytes)
> and enable like long long(maxlign 8bytes).
>  Is it possible to disable int128 in PostgreSQL?

Sure, you can build without it --- easiest way would be to modify
pg_config.h after the configure step.  But the idea that it has
something to do with lock contention seems like nonsense.

			regards, tom lane





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