From: Andres Freund <andres@2ndquadrant.com>
To: Mark Kirkwood <mark.kirkwood@catalyst.net.nz>
Cc: pgsql-performance@postgresql.org
Subject: Re: 60 core performance with 9.3
Date: Fri, 27 Jun 2014 11:19:51 +0200
Message-ID: <20140627091951.GA16680@awork2.anarazel.de> (raw)
In-Reply-To: <53ACD6C4.9050605@catalyst.net.nz>
References: <53ACB190.2030206@catalyst.net.nz>
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<53ACD6C4.9050605@catalyst.net.nz>
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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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To: pgsql-performance@postgresql.org
Cc: andres@2ndquadrant.com, mark.kirkwood@catalyst.net.nz
Subject: Re: 60 core performance with 9.3
In-Reply-To: <20140627091951.GA16680@awork2.anarazel.de>
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