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Date: Fri, 16 Jan 2015 21:08:29 -0500
From: Michael Heaney <mheaney@jcvi.org>
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To: Tom Lane <tgl@sss.pgh.pa.us>
CC: "pgsql-admin@postgresql.org" <pgsql-admin@postgresql.org>
Subject: Re: Huge pages not working on PG 9.4
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On 1/16/2015 6:58 PM, Tom Lane wrote:
> 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

Thanks for the helpful clue, Tom.  I haven't knowingly defined 
_POSIX_SOURCE or any other macros. I go through the same configure/make 
process on the Centos 6.6 VM on my home PC, and huge pages works just 
fine.  Maybe it's an issue with CentOS  6.4?

--
Michael Heaney
JCVI




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