Re: please update ps display for recovery checkpoint

On Mon, Jun 7, 2021 at 12:02 PM Bossart, Nathan <bossartn(at)amazon(dot)com> wrote:
> On 6/6/21, 7:14 PM, "Justin Pryzby" <pryzby(at)telsasoft(dot)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.

See also the nearby thread entitled "when the startup process doesn't"
which touches on this same issue.

--
Robert Haas
EDB: http://www.enterprisedb.com