[pgpool-general: 1543] Re: Mysterious Load Spikes

Lonni J Friedman netllama at gmail.com
Fri Mar 29 00:47:32 JST 2013

Ah, that thread looks interesting, although the original poster seems
to have fixed his issues with a kernel upgrade to some 3.4.x kernel.
I'm using 3.6.6, so I'm not sure whether its the same thing at all.

On Thu, Mar 28, 2013 at 8:40 AM, Tatsuo Ishii <ishii at postgresql.org> wrote:
> Maybe this one?
> http://www.postgresql.org/message-id/512D4548.2000502@agliodbs.com
> --
> Tatsuo Ishii
> SRA OSS, Inc. Japan
> English: http://www.sraoss.co.jp/index_en.php
> Japanese: http://www.sraoss.co.jp
>> Did you have a particular thread in mind?  I scanned the list
>> archives, and honestly didn't see anything relevant.  The closest
>> thing was this very recent off-topic post:
>> http://www.postgresql.org/message-id/51519CE9.1070409@opinioni.net
>> On Thu, Mar 28, 2013 at 2:27 AM, Will Ferguson
>> <wferguson at northplains.com> wrote:
>>> Have a look in the postgres performance mailing lists. There's been a lot of chatter recently about performance problems regarding 3.x kernels.
>>> Will
>>> On 27/03/13 15:24, Quentin Hartman wrote:
>>> On Wed, Mar 27, 2013 at 9:15 AM, Lonni J Friedman <netllama at gmail.com> wrote:
>>>> FWIW, I also see roughly the same behavior, although my environment is
>>>> somewhat different than yours.  Previously my pgpool server was
>>>> running on RHEL6, however it was migrated to Fedora17 (without
>>>> changing the pgpool version).  Before the migration the load on the
>>>> server was typically less than 1.00.  Since migrating the load average
>>>> is 30+ (with spikes up to 60 quite often).  Yet there's nothing
>>>> obvious causing the load.  I'm certain something in pgpool is causing
>>>> this behavior, because the load drops to 0 during the rare times when
>>>> we need to stop pgpool for maintenance.
>>> Thanks for the quick reply Lonni. I'm glad to hear that it's not a problem limited to Ubuntu. Like you I suspect it has something to do with the 3.x kernel series. I'm going to be doing some experimentation soon to try to isolate and eliminate this problem. I'll update this thread with my findings.
>>> If anyone else is interested in coordinating efforts, I'd be glad for the help.
>>> QH

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