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Home > Archive > Linux Debian support > August 2006 > Multiple PIDs for one process on Xeon system
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Multiple PIDs for one process on Xeon system
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| Martin Wagner 2006-08-01, 7:14 pm |
| Hello everyone,
I installed a Debain 3.1 (32-bit) on a Dell Xeon-Server today.
Afterwards I installed mysql-max (from myasql.org). I then recognized,
that newly started processes of the mysql-distribution got assigned
multiple PIDs.
For example, after exevuting "/etc/init.d/mysql.server start", a "ps
aux" showed 16 mysql-processes (others like ndbd oder ndb_mgmd variied
between 12 and 20). All got the same timestamp for creation, identical
command line arguments and continuous PDs. "pidof mysqld" also returns
these 16 PIDs. A "netstat -tulpen" only shows one mysqld-process
listening for incoming connections. There's also no problem stopping the
mysql-server with "/etc/init.d/mysql.server stop", which removes all
processes (+ PIDs) from the process table.
Has anyone ever reconginzed this behaviour, or even better, got some
explanatory comments for this?
Thanks and kind regards,
Martin
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| Mumia W. 2006-08-02, 1:13 am |
| On 08/01/2006 01:42 PM, Martin Wagner wrote:
> Hello everyone,
>
> I installed a Debain 3.1 (32-bit) on a Dell Xeon-Server today.
> Afterwards I installed mysql-max (from myasql.org). I then recognized,
> that newly started processes of the mysql-distribution got assigned
> multiple PIDs.
>
That's perfectly normal for server processes.
> For example, after exevuting "/etc/init.d/mysql.server start", a "ps
> aux" showed 16 mysql-processes [...]
That allows mysql to server 16 requests at the same time.
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| Martin Wagner 2006-08-02, 7:13 pm |
| Mumia W. schrieb:
> On 08/01/2006 01:42 PM, Martin Wagner wrote:
>
> That's perfectly normal for server processes.
>
>
> That allows mysql to server 16 requests at the same time.
This seems quite reasonable, I was just wondering, as I didn't recognize
this, when I installed a test environment into a virtual machine.
Many thanks, for your answer.
Martin
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