| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Kevin Grittner <kgrittn(at)gmail(dot)com> |
| Cc: | Ants Aasma <ants(dot)aasma(at)eesti(dot)ee>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Kevin Grittner <kgrittn(at)postgresql(dot)org>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, "pgsql-committers(at)postgresql(dot)org" <pgsql-committers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] Re: pgsql: Avoid extra locks in GetSnapshotData if old_snapshot_threshold < |
| Date: | 2016-05-07 00:48:44 |
| Message-ID: | 20160507004844.wbze4nhjqa67io2a@alap3.anarazel.de |
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| Lists: | pgsql-committers pgsql-hackers |
On 2016-05-06 19:43:24 -0500, Kevin Grittner wrote:
> It's disappointing that I am not getting more consistent numbers,
> but NUMA can be hard to manage that way.
FWIW, in my experience, unless you disable autovacuum (or rather
auto-analyze), the effects from non-predicable analyze runs with
long-running snapshots are worse. I mean the numa effects suck, but in
r/w workload effects of analyze are often much worse.
That comment reminds me of a question I had: Did you consider the effect
of this patch on analyze? It uses a snapshot, and by memory you've not
built in a defense against analyze being cancelled.
> Will push shortly with the nit-pick fixes you requested.
Cool.
Greetings,
Andres Freund
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