Configuring isapi_scgi
isapi_scgi is configured through the isapi_scgi.ini file which must be located in the same directory as the isapi_scgi.dll extension. This file is in the standard Windows INI file format and may contain the variables described below. These must be defined in the [SCGI] section of the file.
Note that the file is only needed if the defaults described below do not match your desired configuration.
| Variable name | Description | Default |
|---|---|---|
IOCPQueueMax |
Integer value corresponding to the maximum number of queued IOCP requests. | 50 |
KeepStatistics |
If non-0, the extension keeps certain statistics that can be useful in troubleshooting or tuning. | 0 |
LogFile |
Path to the log file. | isapi_scgi.log in the same directory as isapi_scgi.dll. |
LogLevel |
Verbosity of logging. 0 turns off, 1 logs only errors. | 1 |
NumThreads |
Integer value corresponding to the number of worker threads to be run. | 10 |
SCGIServerAddress |
IP address of the SCGI server. | 127.0.0.1 |
SCGIServerPort |
Port the SCGI server is listening on. | 9999 |
SCGIServerStartCommand |
Command to execute start the SCGI application server. See Starting the SCGI server automatically. | None. No server is started by default. |
SCGIServerStopCommand |
Command to execute stop the SCGI application server. See Starting the SCGI server automatically. | None. |
StatisticsLogInterval |
Controls how often statistics are written to the log file. The interval is given in seconds. | 60 |
The optimal values for NumThreads and IOCPQueueMax depend on the system (memory, number of processors and their speed, etc.) and configuration (for example, whether the SCGI server on a different system). On heavily loaded systems, you should determine these values empirically through load testing.
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