From: Dan Nelson
Date: October 17 2008 2:58pm
Subject: Re: MySQL und dual cores
List-Archive: http://lists.mysql.com/mysql/214931
Message-Id: <20081017145849.GH99270@dan.emsphone.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii

In the last episode (Oct 17), Marten Lehmann said:
> we are using MySQL 4.1 and 5 on AMD dual core processors, but I can
> only see one mysqld process on each machine. Since a process is
> always tied to a certain processor, mysqld doesn't seem to make use
> of the second core. As far as I know multiple threads of one process
> would be visible as different processes using the ps command.
> 
> Is mysqld really not using more than one processor core? Or if it
> does, then how can I verify it?

Each thread of a threaded process can run on a different CPU.  Try
connecting to mysql over two sessions and run "SELECT
BENCHMARK(10000000000,1+1);" on both.  If you switch to top you should
see mysqld go to 200% CPU.

-- 
	Dan Nelson
	dnelson@stripped