Re: Some shared memory chunks are allocated even if related processes won't start

On 2024-Mar-04, Hayato Kuroda (Fujitsu) wrote:

> However, the second idea is still valid, which allows the allocation
> of shared memory dynamically. This is a bit efficient for the system
> which tuples won't be frozen. Thought?

I think it would be worth allocating AutoVacuumShmem->av_workItems using
dynamic shmem allocation, particularly to prevent workitems from being
discarded just because the array is full¹; but other than that, the
struct is just 64 bytes long so I doubt it's useful to allocate it
dynamically.

¹ I mean, if the array is full, just allocate another array, point to it
from the original one, and keep going.

--
Álvaro Herrera PostgreSQL Developer — https://www.EnterpriseDB.com/
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