Re: Setting huge_pages=off when HugePages are allocated in Linux?

When does it make sense to use hugepages in Postgresql?

Is usage of hugepages only available in release 18?

Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at> ezt írta (időpont: 2026. jan. 28.,
Sze 19:02):

> On Wed, 2026-01-28 at 10:31 -0500, Ron Johnson wrote:
> > In the example in this (quite helpful) Cybertec post, 10475 HugePages
> are allocated.
> > https://www.cybertec-postgresql.com/en/huge-pages-postgresql/
> >
> > If we set "huge_pages = off" within PG and then restart PG, will Linux
> see those 10475 HugePages as off-limits to normal 4KiB allocations?
>
> Yes. That's why it is a good idea to set "huge_pages = on" if you intend
> to use them with
> PostgreSQL. Otherwise it may happen that PostgreSQL resorts to allocating
> shared buffers
> using normal memory, and your huge pages just sit around and are wasted.
>
> Yours,
> Laurenz Albe
>
>
>