Re: Wait free LW_SHARED acquisition

From: Peter Geoghegan <pg(at)heroku(dot)com>
To: Andres Freund <andres(at)2ndquadrant(dot)com>
Cc: Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Wait free LW_SHARED acquisition
Date: 2013-09-26 23:56:30
Message-ID: CAM3SWZQh8Cpmc36RSwKyhDzw9Hks_vxyWANYwmCE7kq6KQMaDw@mail.gmail.com
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On Thu, Sep 26, 2013 at 3:55 PM, Andres Freund <andres(at)2ndquadrant(dot)com> wrote:
> We have had several customers running postgres on bigger machines report
> problems on busy systems. Most recently one where a fully cached
> workload completely stalled in s_lock()s due to the *shared* lwlock
> acquisition in BufferAlloc() around the buffer partition lock.

That's unfortunate. I saw someone complain about what sounds like
exactly the same issue on Twitter yesterday:

https://twitter.com/Roguelazer/status/382706273927446528

I tried to engage with him, but was unsuccessful.

--
Peter Geoghegan

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