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Date: Wed, 7 Dec 2011 17:41:17 +0000
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From: codefruit <codefruit@googlemail.com>
To: users@httpd.apache.org
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Subject: Re: [users@httpd] mod_proxy ProxyPass max parameter and
 ThreadsPerChild

Hi,

Thank you for the information. I have one more question on this subject....

You say that each server process has its own mod_proxy proxy pools
(all with the same config).

So, if I configure my mod_proxy like so:

ProxyPass /examples http://backend.example.com/examples max=3D10

And there happen to 5 server child processes running, does that mean
that each of process has a max of 10, so, in total, 50 concurrent
connections will be allowed through to the backend?

Thanks,
Jamie

> ---------- Forwarded message ----------
> From:=A0Rainer Jung <rainer.jung@kippdata.de>
> To:=A0users@httpd.apache.org
> Date:=A0Sun, 04 Dec 2011 19:46:31 +0100
> Subject:=A0Re: [users@httpd] mod_proxy ProxyPass max parameter and Thread=
sPerChild
> On 29.11.2011 11:29, codefruit wrote:
>>
>> Hello,
>>
>> I am using Apache 2.2 with the MPM worker. I have some questions about
>> the interaction between the 'max' parameter that can be added to a
>> mod_proxy ProxyPass configuration line and the MPM worker
>> ThreadsPerChild value.
>>
>> =A0From reading the docs, my understanding is that if I add a 'max'
>> key/value to a ProxyPass line then the max should only be less than or
>> equal to ThreadsPerChild.
>
>
>> 1) Is this correct?
>
>
> Yes.
>
>> 2) If I do not add a max value to the ProxyPass line is the maximum
>> amount of connections allowed through still subject to the limit of
>> ThreadsPerChild?
>
>
> Docs say: The default for this limit is the number of threads per process=
 in the active MPM. In the Prefork MPM, this is always 1, while with other =
MPMs it is controlled by the ThreadsPerChild directive.
>
> So: "yes"
>
>> 3) If I have a configuration such as:
>>
>> ProxyPass /examples http://backend.example.com/examples max=3D10
>> ProxyPass /docs http://backend.example.com/docs max=3D100
>>
>> ThreadsPerChild=3D150
>>
>> Can both ProxyPass connection pools use the same server child process
>> (for example a single one with 150 threads)?
>
>
> Yes.
>
> Incoming requests are mapped to threads, threads work on the request and =
finally need to contact a backend server depending on configuration and URL=
. At that point in time they try to get a backend connection from the pool.
>
> Each process has its own proxy pools (all with the same config).
>
> Regards,
>
> Rainer
>

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