On 6/6/21, 7:14 PM, "Justin Pryzby" <pryzby@telsasoft.com> wrote:
> Now, I wonder whether the startup process should also include some detail about
> "syncing data dir". It's possible to strace the process to see what it's
> doing, but most DBA would probably not know that, and it's helpful to know the
> status of recovery and what part of recovery is slow: sync, replay, or
> checkpoint. commit df9274adf improved the situation between replay and
> ckpoint, but it's still not clear what "postgres: startup" means before replay
> starts.
I've seen a few functions cause lengthy startups, including
SyncDataDirectory() (for which I was grateful to see 61752afb),
StartupReorderBuffer(), and RemovePgTempFiles(). I like the idea of
adding additional information in the ps title, but I also think it is
worth exploring additional ways to improve on these O(n) startup
tasks.
Nathan