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Reply to topic   Topic: Optimizing mod_fcgid configuration
Author
tbutler



Joined: 21 Apr 2021
Posts: 1
Location: Saint Louis, MO, USA

PostPosted: Wed 21 Apr '21 8:54    Post subject: Optimizing mod_fcgid configuration Reply with quote

Hello,
I'm just getting into FastCGI to accelerate my Perl scripts (perhaps a couple of decades late, I know) and it has been working great so far with one big caveat: on pages where multiple AJAX requests may occur, the second request is orders of magnitude slower than the initial one (say 1.5 seconds versus 230 ms), regardless of which specific request is done second. After going through the code and watching where the delay occurs, I believe this is since they happen in an asynchronous fashion and Apache doesn't think the script has hit the appropriate "score" to have multiple child processes spawned. (Preventing the AJAX requests from occurring asynchronously proves a stopgap solution that confirms my theory -- the two requests performed serially are way faster than the two performed in parallel.)

Looking at the Apache directives for FastCGI, I suspect I need to set the spawn score lower, but I assume that might risk an excessive amount of spawning. Is there a way to set a default of, say, two (or some other wise number) FastCGI processes for the script (to help with parallel requests), but keep the overall score the same so that it doesn't needlessly spawn a bunch of additional child processes?

I have not modified FcgidMinProcessesPerClass from the default and the Apache documentation mentions the default is 3, which would make me think it should be willingly launching an additional process up to 3, but perhaps I'm misunderstanding what this directive does?

Here's my FastCGI configuration:

Code:
<IfModule fcgid_module>
    FcgidIPCDir /run/mod_fcgid
    FcgidProcessTableFile /run/mod_fcgid/fcgid_shm
    AddHandler fcgid-script .fpl

    # Basic configuration settings
    FcgidMaxRequestLen 1073741824
    MaxRequestsPerProcess 500
</IfModule>


Do you have suggestions on how I might adjust these mod_fcgid settings to make it better address my issue (and/or simply improve the configuration generally)?

Thanks so much!
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James Blond
Moderator


Joined: 19 Jan 2006
Posts: 6935
Location: Germany, Next to Hamburg

PostPosted: Thu 22 Apr '21 21:31    Post subject: Reply with quote

There are a lot of setting for mod_fcgid http://httpd.apache.org/mod_fcgid/mod/mod_fcgid.html

I've never run perl over that. I can give your the config that as been proven to work with PHP.

Code:

<IfModule fcgid_module>


   FcgidMaxProcesses 300
   FcgidMaxProcessesPerClass 300

   FcgidOutputBufferSize 65536
   FcgidConnectTimeout 10
   FcgidProcessLifeTime 0
   FcgidMaxRequestsPerProcess 0
   FcgidMinProcessesPerClass 0
   FcgidFixPathinfo 0
   FcgidProcessLifeTime 0
   FcgidZombieScanInterval 20
   FcgidMaxRequestLen 536870912
   FcgidIOTimeout 120
   FcgidTimeScore 3

   FcgidPassHeader Authorization

   <Files ~ "\.php$">
      Options Indexes FollowSymLinks ExecCGI
      AddHandler fcgid-script .php
      FcgidWrapper "C:/php7/php-cgi.exe" .php
   </Files>
</IfModule>


Maybe that helps.
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