| From: | "Jonathan S(dot) Katz" <jkatz(at)postgresql(dot)org> |
|---|---|
| To: | John Naylor <johncnaylorls(at)gmail(dot)com> |
| Cc: | PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: PostgreSQL 18 GA press release draft |
| Date: | 2025-09-12 01:55:07 |
| Message-ID: | 32f3a1eb-cbde-41f4-b08c-c88574d14ac9@postgresql.org |
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| Thread: | |
| Lists: | pgsql-hackers |
On 9/10/25 9:52 AM, John Naylor wrote:
> On Wed, Sep 10, 2025 at 10:13 AM Jonathan S. Katz <jkatz(at)postgresql(dot)org> wrote:
>
>> PostgreSQL 18 also supports using x86 AVX-512 instructions for CRC32 calculations, which are used in page checksums and are also available in the new [`crc32`](https://www.postgresql.org/docs/18/functions-binarystring.html#FUNCTIONS-BINARYSTRING-OTHER) function.
>
> Hi Jon,
>
> The checksum stored in the page header is not actually a CRC but
> something else entirely. WAL records are a convenient example of
> something that uses CRC.
>
> Also, CRC32 is not hardware accelerated, only CRC32C is. We have two
> SQL-callable functions. To avoid confusion maybe they can be omitted
> from this longer-than-usual announcement -- they seem like a niche
> feature anyway.
Thanks; I've removed the reference.
Jonathan
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