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Date: Sun, 26 Jan 2014 13:51:41 +0100
From: Andres Freund <andres@2ndquadrant.com>
To: Tomas Vondra <tv@fuzzy.cz>
Cc: pgsql-hackers@postgresql.org
Subject: Re: GIN improvements part2: fast scan
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On 2014-01-26 07:24:58 +0100, Tomas Vondra wrote:
> Not sure how to interpret that, though. For example where did the
> ginCompareItemPointers go? I suspect it's thanks to inlining, and that
> it might be related to the performance decrease. Or maybe not.

Try recompiling with CFLAGS="-fno-omit-frame-pointers -O2" and then use
perf record -g. That gives you a hierarchical profile which often makes
such questions easier to answer.

Greetings,

Andres Freund

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


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