Re: PostgreSQL 18 GA press release draft

[Jonathan S. Katz]

On 9/10/25 9:52 AM, John Naylor wrote:

On Wed, Sep 10, 2025 at 10:13 AM Jonathan S. Katz <jk...@postgresql.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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