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help / color / mirror / Atom feedFrom: Nathan Bossart <[email protected]>
To: Tom Lane <[email protected]>
Cc: Jeff Davis <[email protected]>
Cc: [email protected]
Cc: [email protected]
Subject: Re: always use runtime checks for CRC-32C instructions
Date: Tue, 31 Oct 2023 14:57:43 -0500
Message-ID: <20231031195743.GB77436@nathanxps13> (raw)
In-Reply-To: <[email protected]>
References: <20231030161706.GA3011@nathanxps13>
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On Tue, Oct 31, 2023 at 03:42:33PM -0400, Tom Lane wrote:
> The one machine using slicing-by-8 where there might be a better
> alternative is arowana, which is CentOS 7 with a pretty ancient gcc
> version. So I reject the idea that slicing-by-8 is an appropriate
> baseline for comparisons. There isn't anybody who will see an
> improvement over current behavior: in the population of interest,
> just about all platforms are using CRC instructions with or without
> a runtime check.
I only included the slicing-by-8 benchmark to demonstrate that 1) the CRC
computations are a big portion of that pg_waldump -z command and that 2)
the CRC instructions provide significant performance gains.
--
Nathan Bossart
Amazon Web Services: https://aws.amazon.com
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Subject: Re: always use runtime checks for CRC-32C instructions
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