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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Michael Heaney <mheaney@jcvi.org>
cc: Scott Ribe <scott_ribe@elevated-dev.com>,
 "pgsql-admin@postgresql.org" <pgsql-admin@postgresql.org>
Subject: Re: Huge pages not working on PG 9.4
In-reply-to: <54B995CE.5010301@jcvi.org>
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 <73DC9DCF-7C2D-49F7-8E8C-19F9C9E13854@elevated-dev.com>
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Comments: In-reply-to Michael Heaney <mheaney@jcvi.org>
 message dated "Fri, 16 Jan 2015 17:50:54 -0500"
Date: Fri, 16 Jan 2015 18:58:14 -0500
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Michael Heaney <mheaney@jcvi.org> writes:
>> FATAL:  huge pages not supported on this platform

> <sigh>  Nope, that didn't make any difference.  Since I compile my own 
> binary,
> I'm wondering if there's something that 'configure' didn't set properly.

A quick look at the PG source code says that that message means that
MAP_HUGETLB isn't defined.  Our code is expecting <sys/mman.h> to provide
that symbol, which it should do by default according to what I can see on
my RHEL 6.6 box.  Perhaps you've defined some of the feature restriction
macros like _POSIX_SOURCE?

			regards, tom lane


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