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Posted to users@httpd.apache.org by "Gustavo A. Baratto" <gb...@superb.net> on 2003/11/05 20:30:25 UTC
[users@httpd] memory usage for 2 or more instances of apache
Greetings,
I want to run 2 instances of apache built with shared core but with different modules loaded for each instance ... It is correct to assume that the memory used of the core will be shared between the 2 instances? rephrasing: once the core is loaded by one instance of apache, the other instance will use the already loaded core when it starts up? or this second instance will allocate extra memory to load the core again?
thanks :)
Re: [users@httpd] memory usage for 2 or more instances of apache
Posted by Joshua Slive <jo...@slive.ca>.
On Wed, 5 Nov 2003, Gustavo A. Baratto wrote:
> > But I don't think you should really care. The amount of memory you are
> > talking about is tiny compared to the total memory usage.
>
> yes. but in the case of many instances running, this could affect greatly
> affect the memory usage...
It will be a significant effect only if each instance has very low traffic
(and therefore not many processes hanging around). For a typical busy
site with dozens or hundreds of active children, the difference would
probably be undetectable.
Anyway, you can find the answer pretty easily simply by trying it out and
using a tool like "top" to check for resident versus shared memory usage.
Joshua.
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Re: [users@httpd] memory usage for 2 or more instances of apache
Posted by "Gustavo A. Baratto" <gb...@superb.net>.
> But I don't think you should really care. The amount of memory you are
> talking about is tiny compared to the total memory usage.
yes. but in the case of many instances running, this could affect greatly
affect the memory usage...
----- Original Message -----
From: "Joshua Slive" <jo...@slive.ca>
To: <us...@httpd.apache.org>
Sent: Wednesday, November 05, 2003 11:33 AM
Subject: Re: [users@httpd] memory usage for 2 or more instances of apache
>
> On Wed, 5 Nov 2003, Gustavo A. Baratto wrote:
>
> > Greetings,
> >
> > I want to run 2 instances of apache built with shared core but with
> > different modules loaded for each instance ... It is correct to assume
> > that the memory used of the core will be shared between the 2 instances?
> > rephrasing: once the core is loaded by one instance of apache, the other
> > instance will use the already loaded core when it starts up? or this
> > second instance will allocate extra memory to load the core again?
>
> I don't know that answer to that; I suspect it depends on your OS.
>
> But I don't think you should really care. The amount of memory you are
> talking about is tiny compared to the total memory usage. The important
> thing to determine is how much memory is being shared among the apache
> processes that are forked by each server. That will have a much larger
> effect.
>
> Joshua.
>
> ---------------------------------------------------------------------
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Re: [users@httpd] memory usage for 2 or more instances of apache
Posted by "Gustavo A. Baratto" <gb...@superb.net>.
and sorry for bugging again.... but how do I see the how much memory is
shared amaong apache processes?
----- Original Message -----
From: "Joshua Slive" <jo...@slive.ca>
To: <us...@httpd.apache.org>
Sent: Wednesday, November 05, 2003 11:33 AM
Subject: Re: [users@httpd] memory usage for 2 or more instances of apache
>
> On Wed, 5 Nov 2003, Gustavo A. Baratto wrote:
>
> > Greetings,
> >
> > I want to run 2 instances of apache built with shared core but with
> > different modules loaded for each instance ... It is correct to assume
> > that the memory used of the core will be shared between the 2 instances?
> > rephrasing: once the core is loaded by one instance of apache, the other
> > instance will use the already loaded core when it starts up? or this
> > second instance will allocate extra memory to load the core again?
>
> I don't know that answer to that; I suspect it depends on your OS.
>
> But I don't think you should really care. The amount of memory you are
> talking about is tiny compared to the total memory usage. The important
> thing to determine is how much memory is being shared among the apache
> processes that are forked by each server. That will have a much larger
> effect.
>
> Joshua.
>
> ---------------------------------------------------------------------
> The official User-To-User support forum of the Apache HTTP Server Project.
> See <URL:http://httpd.apache.org/userslist.html> for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> " from the digest: users-digest-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org
>
---------------------------------------------------------------------
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Re: [users@httpd] memory usage for 2 or more instances of apache
Posted by Joshua Slive <jo...@slive.ca>.
On Wed, 5 Nov 2003, Gustavo A. Baratto wrote:
> Greetings,
>
> I want to run 2 instances of apache built with shared core but with
> different modules loaded for each instance ... It is correct to assume
> that the memory used of the core will be shared between the 2 instances?
> rephrasing: once the core is loaded by one instance of apache, the other
> instance will use the already loaded core when it starts up? or this
> second instance will allocate extra memory to load the core again?
I don't know that answer to that; I suspect it depends on your OS.
But I don't think you should really care. The amount of memory you are
talking about is tiny compared to the total memory usage. The important
thing to determine is how much memory is being shared among the apache
processes that are forked by each server. That will have a much larger
effect.
Joshua.
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