From: Tom Lane <tgl@sss.pgh.pa.us>
To: Michael Heaney <mheaney@jcvi.org>
Cc: pgsql-admin@postgresql.org <pgsql-admin@postgresql.org>
Subject: Re: Huge pages not working on PG 9.4
Date: Fri, 16 Jan 2015 22:52:37 -0500
Message-ID: <2824.1421466757@sss.pgh.pa.us> (raw)
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Michael Heaney <mheaney@jcvi.org> writes:
> On 1/16/2015 6:58 PM, Tom Lane wrote:
>> 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?
> 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?
Dunno, hard to believe that hugetlb support wasn't there in 6.4. A quick
troll through the RHEL 6.5 and 6.6 release notes finds something about
better hugetlb support for System Z processors, but what we're discussing
here shouldn't be architecture-specific.
You might try comparing /usr/include/sys/mman.h, /usr/include/bits/mman.h,
and /usr/include/features.h between your 6.4 and 6.6 systems to see if
you can spot any relevant differences.
regards, tom lane
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To: pgsql-admin@postgresql.org
Cc: tgl@sss.pgh.pa.us, mheaney@jcvi.org
Subject: Re: Huge pages not working on PG 9.4
In-Reply-To: <2824.1421466757@sss.pgh.pa.us>
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