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help / color / mirror / Atom feedFrom: Nathan Bossart <[email protected]>
To: Michael Paquier <[email protected]>
Cc: Xiang Gao <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: CRC32C Parallel Computation Optimization on ARM
Date: Tue, 24 Oct 2023 16:18:06 -0500
Message-ID: <20231024211806.GA919080@nathanxps13> (raw)
In-Reply-To: <20231024210954.GA918290@nathanxps13>
References: <DB9PR08MB6991329A73923BF8ED4B3422F5DBA@DB9PR08MB6991.eurprd08.prod.outlook.com>
<[email protected]>
<20231024210954.GA918290@nathanxps13>
On Tue, Oct 24, 2023 at 04:09:54PM -0500, Nathan Bossart wrote:
> I'm able to reproduce the speedup with the provided benchmark on an Apple
> M1 Pro (which appears to have the required instructions). There was almost
> no change for the 512-byte case, but there was a ~60% speedup for the
> 4096-byte case.
>
> However, I couldn't produce any noticeable speedup with Heikki's pg_waldump
> benchmark [0]. I haven't had a chance to dig further, unfortunately.
> Assuming I'm not doing something wrong, I don't think such a result should
> necessarily disqualify this optimization, though.
Actually, since the pg_waldump benchmark likely only involves very small
WAL records, it would make sense that there isn't much difference.
*facepalm*
--
Nathan Bossart
Amazon Web Services: https://aws.amazon.com
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To: [email protected]
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Subject: Re: CRC32C Parallel Computation Optimization on ARM
In-Reply-To: <20231024211806.GA919080@nathanxps13>
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