Apache newbie help - Multiple /usr/sbin/httpd2-preforks ...

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Hi guys,

I am sorry if this is such a newbie question!



I was diagnosing an un-related issue on my web-server and had to list
processes to see which PID needed to be killed. I noticed that there
were several entries for the "http2-prefork" process ...



[start]

wwwrun 8786 0.0 0.5 88452 6052 ? S 10:54 0:00
/usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf

wwwrun 8787 0.0 0.5 88452 6052 ? S 10:54 0:00
/usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf

wwwrun 8788 0.0 0.5 88452 6052 ? S 10:54 0:00
/usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf

wwwrun 8790 0.0 0.5 88452 6040 ? S 10:54 0:00
/usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf

wwwrun 8791 0.0 0.5 88452 6040 ? S 10:54 0:00
/usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf

wwwrun 8793 0.0 0.5 88452 6040 ? S 10:54 0:00
/usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf

wwwrun 8813 0.0 0.5 88452 6036 ? S 10:54 0:00
/usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf

wwwrun 8814 0.0 0.5 88452 6036 ? S 10:54 0:00
/usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf

wwwrun 8815 0.0 0.5 88452 6040 ? S 10:54 0:00
/usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf

[end]



I mean, it's not a huge problem or anything the webserver seems to be
running OK - but is it right there should be multiple processes running
like this? I am sorry but I do not know if you need to view any configs
or if there is a setting somewhere that controls the number of
processes, I installed it through Yast and left it as default (as I am a
newbie and this is for a home website!).



I really would appreciate any replies that will help me to understand
better.

Thank you



Richard




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>

Re: Apache newbie help - Multiple /usr/sbin/httpd2-preforks

On Fri, Feb 26, 2010 at 8:31 AM, Richard Peacock
wrote:
> Hi guys,
>
> I am sorry if this is such a newbie question!
>
>
>
> I was diagnosing an un-related issue on my web-server and had to list
> processes to see which PID needed to be killed.=A0 I noticed that there w=
ere
> several entries for the =93http2-prefork=94 process =85
>

That's normal:

http://httpd.apache.org/docs/2.2/mod/prefork.html


--=20
Eric Covener
covener@gmail.com

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Re: Apache newbie help - Multiple /usr/sbin/httpd2-preforks

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On Fri, Feb 26, 2010 at 7:01 PM, Richard Peacock <
richard.peacock@minorplanet.com> wrote:

> Hi guys,
>
> I am sorry if this is such a newbie question!
>
>
>
> I was diagnosing an un-related issue on my web-server and had to list
> processes to see which PID needed to be killed. I noticed that there wer=
e
> several entries for the =93http2-prefork=94 process =85
>
>
>
> [start]
>
> wwwrun 8786 0.0 0.5 88452 6052 ? S 10:54 0:00
> /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf
>
> wwwrun 8787 0.0 0.5 88452 6052 ? S 10:54 0:00
> /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf
>
> wwwrun 8788 0.0 0.5 88452 6052 ? S 10:54 0:00
> /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf
>
> wwwrun 8790 0.0 0.5 88452 6040 ? S 10:54 0:00
> /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf
>
> wwwrun 8791 0.0 0.5 88452 6040 ? S 10:54 0:00
> /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf
>
> wwwrun 8793 0.0 0.5 88452 6040 ? S 10:54 0:00
> /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf
>
> wwwrun 8813 0.0 0.5 88452 6036 ? S 10:54 0:00
> /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf
>
> wwwrun 8814 0.0 0.5 88452 6036 ? S 10:54 0:00
> /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf
>
> wwwrun 8815 0.0 0.5 88452 6040 ? S 10:54 0:00
> /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf
>
> [end]
>
>
>
> I mean, it=92s not a huge problem or anything the webserver seems to be
> running OK - but is it right there should be multiple processes running l=
ike
> this? I am sorry but I do not know if you need to view any configs or if
> there is a setting somewhere that controls the number of processes, I
> installed it through Yast and left it as default (as I am a newbie and th=
is
> is for a home website!).
>
>
>
> I really would appreciate any replies that will help me to understand
> better.
>
> Thank you
>
>
>
> Richard
>
> ************************************************************ **********
> Privileged/Confidential Information may be contained in this
> message. If you are not the addressee indicated in this
> message (or responsible for delivery of the message to such
> person), you must not copy, distribute or take any action in
> reliance to it.
> In such case, you should destroy this message and kindly
> notify the sender by reply email. Please advise immediately
> if you or your employer do not consent to Internet email for
> messages of this kind. Opinions, conclusions and other
> information in this message that do not relate to the official
> business of Minorplanet Systems plc shall be understood as
> neither given nor endorsed by it.
> Minorplanet Systems plc, Registration no: 3372097
> Minorplanet Limited, Registration no: 4072786
> Greenwich House, 223 North Street, Leeds, LS7 2AA
> VAT #: 698 1438 86
> ************************************************************ **********
>
>
>

Prefork is always like that. It will spawn a process for each request.

--=20
Nilesh Govindarajan
Site & Server Administrator
www.itech7.com

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Re: Apache newbie help - Multiple /usr/sbin/httpd2-preforks ...

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On Feb 26, 2010, at 8:31 AM, Richard Peacock wrote:

> I was diagnosing an un-related issue on my web-server and had to list =
processes to see which PID needed to be killed. I noticed that there =
were several entries for the =93http2-prefork=94 process =85
> =20
> I mean, it=92s not a huge problem or anything the webserver seems to =
be running OK - but is it right there should be multiple processes =
running like this? I am sorry but I do not know if you need to view any =
configs or if there is a setting somewhere that controls the number of =
processes, I installed it through Yast and left it as default (as I am a =
newbie and this is for a home website!).
> =20

Yes, this is how it works. There's one parent process, and it pre-forks =
(creates multiple copies) in order for each one of those copies to =
handle incoming requests. It's normal and expected. Each child process =
can handle an inbound request, and the parent is responsible for =
delegating the requests to the child processes, and making sure that =
there are enough to handle the load.

--Rich=

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-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; =
">

Re: Apache newbie help - Multiple /usr/sbin/httpd2-preforks ...

On Feb 26, 2010, at 8:35 AM, Nilesh Govindarajan wrote:

> Prefork is always like that. It will spawn a process for each request.

Not exactly. It spawns processes ahead of time, and then manages the =
process pool within specified parameters. Saying that it spawns a =
process for each request somewhat misses the "pre" nature of "prefork", =
and also suggests that it will create processes forever, and destroy =
them once the request is over.

--Rich=

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