| From: | Andrey Borodin <x4mmm(at)yandex-team(dot)ru> |
|---|---|
| To: | Michael Paquier <michael(at)paquier(dot)xyz> |
| Cc: | Postgres hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Kevin Grittner <kgrittn(at)gmail(dot)com> |
| Subject: | Re: O_DIRECT for relations and SLRUs (Prototype) |
| Date: | 2019-01-15 06:19:48 |
| Message-ID: | D82D8F7C-A0A0-4661-9066-F69F37E64287@yandex-team.ru |
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| Lists: | pgsql-hackers |
> 12 янв. 2019 г., в 9:46, Michael Paquier <michael(at)paquier(dot)xyz> написал(а):
>
> Note that pg_attribute_aligned() cannot be used as that's not an
> option with clang and a couple of other comilers as far as I know, so
> the patch uses a simple set of placeholder buffers large enough to be
> aligned with the OS pages, which should be 4k for Linux by the way,
> and not set to BLCKSZ, but for WAL's O_DIRECT we don't really care
> much with such details.
Is it possible to avoid those memcopy's by aligning available buffers instead?
I couldn't understand this from the patch and this thread.
Best regards, Andrey Borodin.
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