Date: Sat, 17 Jan 2015 16:46:20 +0000 (UTC)
From: Glyn Astill <glynastill@yahoo.co.uk>
Reply-To: Glyn Astill <glynastill@yahoo.co.uk>
To: Scott Ribe <scott_ribe@elevated-dev.com>,
 Michael Heaney <mheaney@jcvi.org>
Cc: "pgsql-admin@postgresql.org" <pgsql-admin@postgresql.org>
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Subject: Re: Huge pages not working on PG 9.4
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> From: Scott Ribe <scott_ribe@elevated-dev.com>


> To: Michael Heaney <mheaney@jcvi.org>
> Cc: "pgsql-admin@postgresql.org" <pgsql-admin@postgresql.org>
> Sent: Friday, 16 January 2015, 23:39
> Subject: Re: [ADMIN] Huge pages not working on PG 9.4
> 
> On Jan 16, 2015, at 3:50 PM, Michael Heaney <mheaney@jcvi.org> wrote:
>> 
>>  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.
> 
> Possibly configure needed to see the settings you just made? (I really have 
> idea--that first link I posted exhausted my knowledge on that subject.)
> 


I've very thin knowledge on this too, but I'll chip in with what I remember.  Not sure if you'd have to set hugetlb_shm_group to the gid of the postgres user.

And I think you can see what support your kernel was compiled with this:

$ grep HUGE /boot/config-$(uname -r)

And a quick peek at what you've got set up currently:

$ grep -R "" /sys/kernel/mm/hugepages/ /proc/sys/vm/*huge*

$ cat /proc/meminfo |grep Huge


Perhaps if you post those to the list it'd help someone advise?


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