How to use PHP-FPM optimization to improve the performance of LimeSurvey application

How to use PHP-FPM optimization to improve the performance of LimeSurvey application

1. Background introduction
LimeSurvey is an open source online survey software that provides a wealth of Features and flexible configuration options allow users to easily create and manage various types of surveys. However, as survey volume increases and the number of users rises, the performance of the LimeSurvey application may be affected. In order to solve this problem, we can improve the performance of LimeSurvey application by optimizing PHP-FPM.

2. PHP-FPM optimization

1. Increase the number of PHP-FPM processes
   In the PHP-FPM configuration file, we can adjust pm.max_children Parameters to increase the number of PHP-FPM processes. This parameter determines the maximum number of requests that PHP-FPM can handle simultaneously. By appropriately increasing the value of this parameter, the concurrent processing capabilities of the LimeSurvey application can be improved, thereby improving performance.

   Sample code:

   pm.max_children = 50

2. Adjust the process management strategy of PHP-FPM
   PHP-FPM supports a variety of process management strategies, including static (static) and dynamic (dynamic) and ondemand (on demand) three modes. In static mode, the number of processes of PHP-FPM is fixed; in dynamic mode, PHP-FPM will automatically increase or decrease the number of processes according to the number of requests; in on-demand mode, the number of processes of PHP-FPM is dynamically adjusted according to the number of requests. , and when there are no requests for a period of time, the process will automatically exit. According to the actual situation of LimeSurvey, choosing an appropriate process management strategy can improve performance.

   Sample code:

   pm = dynamic
   pm.max_children = 50
   pm.start_servers = 10
   pm.min_spare_servers = 5
   pm.max_spare_servers = 20
   pm.process_idle_timeout = 10s

3. Enable process reuse of PHP-FPM
   PHP-FPM supports process reuse, that is, multiple requests can share the same process, thereby reducing the overhead of process creation and destruction. By setting the pm.max_requests parameter, you can specify the maximum number of requests handled by each process. When a process has processed the specified number of requests, PHP-FPM will automatically release it and create a new process.

   Sample code:

   pm.max_requests = 1000

4. Reasonably set the connection timeout of PHP-FPM
   In the configuration file of PHP-FPM, you can set the request_terminate_timeout parameter to specify a single The requested connection timeout. According to the actual situation of LimeSurvey, setting this parameter appropriately can avoid long waiting times for requests, thereby improving performance.

   Sample code:

   request_terminate_timeout = 60s

3. Conclusion
Through the above optimization measures, we can improve the performance of the LimeSurvey application and enhance the user experience. Of course, different application scenarios may require different optimization strategies, which need to be adjusted according to the actual situation. At the same time, you can also use monitoring tools to understand the performance characteristics of the system and make timely adjustments to obtain better performance.

The above is a detailed introduction on how to use PHP-FPM optimization to improve the performance of LimeSurvey application. I hope it will be helpful to you.

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