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From Jeff Trawick <traw...@gmail.com>
Subject Re: [users@httpd] Optimizing mod_fcgid
Date Tue, 23 Mar 2010 13:50:50 GMT
On Tue, Mar 23, 2010 at 8:48 AM, Nilesh Govindarajan <lists@itech7.com> wrote:
> On 03/23/2010 06:07 PM, Jeff Trawick wrote:
>>
>> On Sat, Mar 20, 2010 at 2:16 AM, Nilesh Govindarajan<lists@itech7.com>
>>  wrote:
>>>
>>> Hi,
>>>
>>> I recently migrated from mod_fastcgi to mod_fcgid and experienced
>>> enormous
>>> performance boost.
>>>
>>> My current settings is as follows -
>>>
>>> FcgidMaxProcesses 100
>>> FcgidMaxProcessesPerClass 50
>>> FcgidFixPathInfo 1
>>> FcgidPassHeader HTTP_AUTHORIZATION
>>> FcgidMaxRequestsPerProcess 10000
>>
>> Since this is PHP, make sure you sync PHP's child exit strategy with
>> mod_fcgid's max-requests-per-process.
>>
>> See "Special PHP considerations" at
>> http://httpd.apache.org/mod_fcgid/mod/mod_fcgid.html for discussion of
>> a couple of issues.
>>
>>> FcgidOutputBufferSize 1048576
>>> FcgidProcessLifeTime 1800
>>> FcgidMinProcessesPerClass 2
>>>
>>> Main use is for PHP applications, but in future may add some languages.
>>>
>>> Server config -
>>>
>>> Fedora 12, 500 MB RAM, Pentium 2 Ghz
>>>
>>> PHP applications are cached using Xcache, and will normally use
>>> PostgreSQL.
>
> Yeah I've synced that by setting the relevant PHP_FCGI_* environment
> variables.
>
> But Xcache doesn't work with mod_fcgid. Any solutions for that ? Can I use
> any alternatives to Xcache to cache the compiled code of the PHP script ?

Aren't APC and Xcache similar with respect to mod_fcgid, in that the
cache will be utilized for repeated execution by the same PHP process,
such that the cache is still useful as long as the PHP process spawned
by mod_fcgid remains active for as long as possible?

(mod_fcgid's mapping of requests to idle processes it has spawned
negates the use of a single such cache for multiple concurrent
requests.)

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