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Date:      Wed, 4 Aug 2004 14:22:07 -0700
From:      Jeremy Chadwick <freebsd@jdc.parodius.com>
To:        current@freebsd.org
Subject:   Re: Postgresql locks up server - no response at all
Message-ID:  <20040804212207.GA48062@parodius.com>
In-Reply-To: <411152D8.2050305@alumni.rice.edu>
References:  <1091649533.29481.42.camel@lanshark.dmv.com> <20040804203456.GA46377@parodius.com> <411152D8.2050305@alumni.rice.edu>

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Revision 1.72 / (download) - annotate - [select for diffs], Sun Aug 1 14:31:45 2004 UTC (3 days, 6 hours ago) by scottl 

$ uname -a
FreeBSD medusa.parodius.com 5.2-CURRENT FreeBSD 5.2-CURRENT #0: Sun Aug  1 07:22:27 PDT 2004     root@medusa.parodius.com:/usr/obj/usr/src/sys/MEDUSA  i386

Missed it by 7 hours.  :-)

I'll give things a shot with a newer src-all and world.

-- 
| Jeremy Chadwick                                 jdc at parodius.com |
| Parodius Networking                        http://www.parodius.com/ |
| UNIX Systems Administrator                   Mountain View, CA, USA |
| Making life hard for others since 1977.                             |

On Wed, Aug 04, 2004 at 04:19:20PM -0500, Jon Noack wrote:
> On 08/04/04 15:34, Jeremy Chadwick wrote:
> >I've seen this with our SuperMicro SuperServer 5013C-T, running mysqld.
> >Please note that the server is "heavily loaded" (note the quotes); usually
> >a load of around 0.50 to 1.00 at all times, with mysqld being the top
> >process.  Server runs all latest -CURRENT builds.
> >
> >Many people over in freebsd-threads mentioned this problem, and recommended
> >all sorts-of different workarounds.  I tried every one available to me,
> >except mucking with PREEMPTION (as I did not feel comfortable tinkering
> >with a random .h file on the box; seemed to be a kernel-related thing,
> >so I'd rather have just an "options" line for it -- I'm conditionally
> >lazy).
> 
> The one you didn't try most likely was the culprit.  Robert Watson 
> showed that PREEMPTION and threading don't play well together right now:
> http://lists.freebsd.org/pipermail/freebsd-current/2004-July/031211.html
> 
> The thought is that PREEMPTION uncovers scheduler bugs, but nobody's 
> figured it out at the moment.
> 
> >Wed Aug  4 13:28:35 PDT 2004
> >* -CURRENT box is still alive and well.
> 
> PREEMPTION was turned off on August 1st, so if you've updated since then 
> things should have stabilized a bit:
> http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/i386/include/param.h#rev1.72
> 
> Jon



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