Horton

Re: [PATCH] Hex-coding optimizations using SVE on ARM.

Michael Paquier <michael@paquier.xyz>

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From: Michael Paquier <michael@paquier.xyz>
To: John Naylor <johncnaylorls@gmail.com>
Cc: Nathan Bossart <nathandbossart@gmail.com>, "Chiranmoy.Bhattacharya@fujitsu.com" <Chiranmoy.Bhattacharya@fujitsu.com>, "Devanga.Susmitha@fujitsu.com" <Devanga.Susmitha@fujitsu.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>, "Ragesh.Hajela@fujitsu.com" <Ragesh.Hajela@fujitsu.com>
Date: 2025-01-14T05:40:40Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Optimize hex_encode() and hex_decode() using SIMD.

  2. Speed up hex_encode with bytewise lookup

On Tue, Jan 14, 2025 at 12:27:30PM +0700, John Naylor wrote:
> We can do about as well simply by changing the nibble lookup to a byte
> lookup, which works on every compiler and architecture:
> 
> select hex_encode_test(1000000, 1024);
> master:
> Time: 1158.700 ms
> v2:
> Time:  777.443 ms
> 
> If we need to do much better than this, it seems better to send the
> data to the client as binary, if possible.

That's pretty cool.  Complex to parse, still really cool.
--
Michael