deluvas/mod_fcgid-params.md

## mod_fcgid-params.md

      
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              mod_fcgid-params.md
            
          
    Notable parameters


FcgidMaxProcessesPerClass

Default: 100
Maximum amount of processes per application/website/wrapper.


FcgidProcessLifeTime

Default: 3600 seconds (0 disables check)
Idle processes which have existed for greater than this time will be terminated, if the number of processses for the class exceeds FcgidMinProcessesPerClass.
Working processes shall not be terminated.
This process lifetime check is performed at the frequency of the configured FcgidIdleScanInterval.


FcgidMaxRequestsPerProcess

Default: 0 (disables check).
FastCGI process will be terminated after handling the specified number of requests. See Accesses from server-status


FcgidMaxRequestLen

Default: 131072 bytes
If request body size exceeds limit - including uploads - FastCGI fails with 500 Server Error.


FcgidErrorScanInterval

Default: 3 seconds
Interval at which processes marked for termination are killed.


FcgidSpawnScoreUpLimit

Default: 10
Controls rate at which new processes spawn.


Errors


End of script output before headers: %s

CGI process ended abruptly/crashed etc.


Notes


PHP OPcache. The popular APC opcode cache for PHP cannot share a cache between PHP FastCGI processes unless PHP manages the child processes. Thus, the effectiveness of the cache is limited with mod_fcgid; concurrent PHP requests will use different opcode caches.


php_cgi.exe defaults to 500 requests per process. This can be changed via environment variable.


Timeouts. Processes that reach a certain timeout (IO/Busy/Idle) are marked for termination and are killed every FcgidErrorScanInterval seconds.


Process spawn rate. Initially, the application starts with 0 score.
Each time a process is spawn, FcgidSpawnScore (default 1) is added to the score. When a process is terminated, FcgidTerminationScore (default 2)
is added to the score. Every second, FcgidTimeScore (default 1) is substracted from the score. A process can be spawned if the
current score is lower than FcgidSpawnScoreUpLimit.


Idling and FcgidMinRequestsPerClass. All application processes which have not handled a request for this period of time will be terminated,
if the number of processses for the class exceeds FcgidMinProcessesPerClass.


Other relevant parameters


TimeOut

Default: 60 seconds
The TimeOut directive defines the length of time Apache httpd will wait for I/O in various circumstances:

When reading data from the client, the length of time to wait for a TCP packet to arrive if the read buffer is empty.
When writing data to the client, the length of time to wait for an acknowledgement of a packet if the send buffer is full.
In (F)CGI, the length of time to wait for output from a CGI script.
In mod_ext_filter, the length of time to wait for output from a filtering process.
In mod_proxy, the default timeout value if ProxyTimeout is not configured.