From: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
---|---|
To: | Peter Geoghegan <pg(at)heroku(dot)com> |
Cc: | Andres Freund <andres(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: hung backends stuck in spinlock heavy endless loop |
Date: | 2015-01-13 23:50:34 |
Message-ID: | CAHyXU0zPxRqKf00Tc6vQoCbTYZ=HWoUJbC0C+SrXJA3i=imegQ@mail.gmail.com |
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On Tue, Jan 13, 2015 at 5:49 PM, Peter Geoghegan <pg(at)heroku(dot)com> wrote:
> On Tue, Jan 13, 2015 at 3:21 PM, Andres Freund <andres(at)2ndquadrant(dot)com> wrote:
>> My guess is rather that it's contention on the freelist lock via
>> StrategyGetBuffer's. I've seen profiles like this due to exactly that
>> before - and it fits to parallel loading quite well.
>
> I'm not saying you're wrong, but the breakdown of _bt_moveright()
> relative to _bt_relandgetbuf() calls seems a bit fishy to me.
>
> I don't remember seeing _bt_moveright() or _bt_compare() figuring so
> prominently, where _bt_binsrch() is nowhere to be seen. I can't see a
> reference to _bt_binsrch() in either profile.
hm, this is hand compiled now, I bet the symbols are wrong.
merlin
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