Re: Setting oom_adj on linux?

From: Alex Hunsaker <badalex(at)gmail(dot)com>
To: Stephen Frost <sfrost(at)snowman(dot)net>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Magnus Hagander <magnus(at)hagander(dot)net>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Setting oom_adj on linux?
Date: 2010-01-08 17:11:00
Message-ID: 34d269d41001080911u2d6fca4dofc02bf9cd143f1b2@mail.gmail.com
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On Fri, Jan 8, 2010 at 10:07, Stephen Frost <sfrost(at)snowman(dot)net> wrote:
> * Tom Lane (tgl(at)sss(dot)pgh(dot)pa(dot)us) wrote:
>> I don't want to go to the trouble of creating (and documenting) a
>> configure option for this.  Much less a GUC ;-)
>
> Requiring a custom build to disable it would be horrible, in my view.
> Or, at best, just means that the packagers won't enable it, which
> obviously would be less than ideal.

FWIW I agree.

> Sorry if it's a pain, but I think it needs to either be configurable or
> not done.  As I said before, it definitely needs to handle failure
> gracefully, but I worry that even that won't be sufficient in some
> cases.  Just thinking about how we run PG under VServers and Linux
> Containers and whatnot, we ran into some issues with OpenSSH trying to
> monkey with proc values and I'd really hate to run into the same issues
> with PG.

As long as the VM/container you are running under wont kill postmaster
for trying to access proc-- the patch I posted should work fine. It
just ignores any error (I assumed you might be running in a chroot
without proc or some such).

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