| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Satoshi Nagayasu <snaga(at)uptime(dot)jp> |
| Cc: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org, Qi Huang <huangqiyx(at)hotmail(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com> |
| Subject: | Re: pg_stat_lwlocks view - lwlocks statistics, round 2 |
| Date: | 2012-10-19 17:45:38 |
| Message-ID: | 538.1350668738@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Satoshi Nagayasu <snaga(at)uptime(dot)jp> writes:
> Ok, I guess we have reached the consensus to have
> "some flight-recorder". Right?
I remain unconvinced. I think the argument that this will promote
novice understanding is complete hogwash: making any sense of
lwlock-level stats will require deep PG understanding, not create it.
And despite Jeff's optimistic views upthread, I don't think very many
people have or will acquire such understanding. So I'm really resistant
to accepting even minimal overhead in pursuit of this goal --- and I
do not believe the overhead will be minimal, either.
regards, tom lane
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