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From: Thomas Munro <[email protected]>
To: Koen De Groote <[email protected]>
Cc: PostgreSQL General <[email protected]>
Subject: Re: Running docker in postgres, SHM size of the docker container in postgres 16
Date: Wed, 20 Nov 2024 12:37:24 +1300
Message-ID: <CA+hUKGKKUoS4PDjjP_j6tHRS7jPm=Pu+4Ai56ZT+UWoT2FRcoQ@mail.gmail.com> (raw)
In-Reply-To: <CAGbX52GNvsV-sNAS36LwmFOc2Qsn74ZA31T_GNJNeBYATJGBAw@mail.gmail.com>
References: <CAGbX52GNvsV-sNAS36LwmFOc2Qsn74ZA31T_GNJNeBYATJGBAw@mail.gmail.com>

On Wed, Nov 20, 2024 at 11:22 AM Koen De Groote <[email protected]> wrote:
> Why would that be? It's the exact same data. The install is about 50GB in size. Is there something wrong with postgres 16, or did some settings significantly change, that I need to know about? I went over all the changelogs, nothing stood out as relevant to this, but that might be a lack of experience on my end.

Parallel vacuum arrived in PostgreSQL 13, and that uses "dynamic
shared memory" to share state between workers, and assuming
dynamic_shared_memory_type=posix, that means shm_open(), which opens
files under /dev/shm on Linux.

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