On Wed, Nov 20, 2024 at 11:22 AM Koen De Groote <kdg.dev@xxxxxxxxx> 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.
