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From: Pop, Sebastian <[email protected]>
To: Christoph Berg <[email protected]>
Cc: PostgreSQL in Debian <[email protected]>
Cc: Saidi, Ali <[email protected]>
Cc: Csoma, Csaba <[email protected]>
Subject: Re: [PATCH] audo-detect and use -moutline-atomics compilation flag for aarch64
Date: Thu, 11 Nov 2021 21:21:30 +0000
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>

>> The benchmarks in
>> https://www.postgresql.org/message-id/1C8D0E58-FB33-4105-AC00-8FA07621F5DD%40amazon.com
>> don't look like the option is a game-changer.
>
> Since then we have seen benchmarks that are several orders of magnitude faster with LSE instructions.
> I will get the new data and share.

On an m6gd.metal with PostgreSQL v11
test: pgbench - select-only
Measure tps (transactions/s), higher is better.

build without LSE: 132143 tps 
with LSE atomics: 844552 tps

That is a 6.39x speedup.

Sebastian

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