Re: Running docker in postgres, SHM size of the docker container in postgres 16

From: Thomas Munro <thomas(dot)munro(at)gmail(dot)com>
To: Koen De Groote <kdg(dot)dev(at)gmail(dot)com>
Cc: PostgreSQL General <pgsql-general(at)lists(dot)postgresql(dot)org>
Subject: Re: Running docker in postgres, SHM size of the docker container in postgres 16
Date: 2024-11-19 23:37:24
Message-ID: CA+hUKGKKUoS4PDjjP_j6tHRS7jPm=Pu+4Ai56ZT+UWoT2FRcoQ@mail.gmail.com
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On Wed, Nov 20, 2024 at 11:22 AM Koen De Groote <kdg(dot)dev(at)gmail(dot)com> 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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