From: Jakub Ouhrabka <kuba@comgate.cz>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-performance@postgresql.org
Subject: Re: Linux/PostgreSQL scalability issue - problem with 8 cores
Date: Thu, 03 Jan 2008 18:37:29 +0100
Message-ID: <477D1D59.7050002@comgate.cz> (raw)
In-Reply-To: <7083.1199379570@sss.pgh.pa.us>
References: <flii57$748$1@news.hub.org>
<7083.1199379570@sss.pgh.pa.us>
Hi Tom,
> Interesting. Maybe you could use oprofile to try to see what's
> happening? It sounds a bit like momentary contention for a spinlock,
> but exactly what isn't clear.
ok, we're going to try oprofile, will let you know...
> Perhaps. Have you tried logging executions of NOTIFY to see if they
> are correlated with the spikes?
We didn't log the notifies but I think it's not correlated. We'll have a
detailed look next time we try it (with oprofile).
Thanks for suggestions!
Kuba
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To: pgsql-performance@postgresql.org
Cc: kuba@comgate.cz, tgl@sss.pgh.pa.us
Subject: Re: Linux/PostgreSQL scalability issue - problem with 8 cores
In-Reply-To: <477D1D59.7050002@comgate.cz>
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