From: Karl Denninger <karl@denninger.net>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Merlin Moncure <mmoncure@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Performance issue with 8.2.3 - "C" application
Date: Wed, 25 Jul 2007 16:01:28 -0500
Message-ID: <46A7BA28.5030203@denninger.net> (raw)
In-Reply-To: <46A6C50D.1000908@denninger.net>
References: <46A6A549.1040606@denninger.net>
<29633.1185331558@sss.pgh.pa.us>
<46A6BBB1.1020502@denninger.net>
<b42b73150707242015k615c7018s75cc0b804dbb5677@mail.gmail.com>
<46A6C080.10204@denninger.net>
<122.1185333906@sss.pgh.pa.us>
<46A6C50D.1000908@denninger.net>
Looks like that was the problem - got a day under the belt now with the
8.2.4 rev and all is back to normal.
Karl Denninger (karl@denninger.net)
http://www.denninger.net
Karl Denninger wrote:
> Aha!
>
> BIG difference. I won't know for sure until the biz day tomorrow but
> the "first blush" look is that it makes a HUGE difference in system
> load, and I no longer have the stats collector process on the top of
> the "top" list......
>
> Karl Denninger (karl@denninger.net)
> http://www.denninger.net
>
>
>
>
> Tom Lane wrote:
>> Karl Denninger <karl@denninger.net> writes:
>>
>>> Hmmmmm..... now that's interesting. Stats collector IS accumulating
>>> quite a bit of runtime..... me thinks its time to go grab 8.2.4.
>>>
>>
>> I think Merlin might have nailed it --- the "stats collector bug" is
>> that it tries to write out the stats file way more often than it
>> should. So any excessive userland CPU time you see is just the tip
>> of the iceberg compared to the system and I/O costs incurred.
>>
>> regards, tom lane
>>
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To: pgsql-performance@postgresql.org
Cc: karl@denninger.net, tgl@sss.pgh.pa.us, mmoncure@gmail.com
Subject: Re: Performance issue with 8.2.3 - "C" application
In-Reply-To: <46A7BA28.5030203@denninger.net>
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