Re: 60 core performance with 9.3

From: Andres Freund <andres(at)2ndquadrant(dot)com>
To: Mark Kirkwood <mark(dot)kirkwood(at)catalyst(dot)net(dot)nz>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: 60 core performance with 9.3
Date: 2014-06-27 09:19:51
Message-ID: 20140627091951.GA16680@awork2.anarazel.de
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On 2014-06-27 14:28:20 +1200, Mark Kirkwood wrote:
> My feeling is spinlock or similar, 'perf top' shows
>
> kernel find_busiest_group
> kernel _raw_spin_lock
>
> as the top time users.

Those don't tell that much by themselves, could you do a hierarchical
profile? I.e. perf record -ga? That'll at least give the callers for
kernel level stuff. For more information compile postgres with
-fno-omit-frame-pointer.

Greetings,

Andres Freund

--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services

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