To enable PHP-FPM slow log and analyze slow PHP requests, you can follow the steps below:
Make sure PHP-FPM is installed and running on your server.
Open the PHP-FPM configuration file. The location of the file can vary depending on your operating system and PHP-FPM version. Common locations include /etc/php/7.4/fpm/php-fpm.conf, /etc/php/7.4/fpm/pool.d/www.conf, or /etc/php-fpm.d/www.conf.
Uncomment or add the following line in the configuration file to enable slow log:
slowlog = /var/log/php-fpm/www-slow.log
request_slowlog_timeout = 10s
This will log PHP requests that take longer than 10 seconds to complete. You can adjust the request_slowlog_timeout value as per your requirements.
Save the changes and restart PHP-FPM service for the changes to take effect. The command to restart PHP-FPM can vary based on your system, but common commands include sudo service php-fpm restart or sudo systemctl restart php-fpm.
Monitor the specified log file (/var/log/php-fpm/www-slow.log in this example) for slow PHP requests. You can use tools like tail to view the latest entries in the log file:
tail -f /var/log/php-fpm/www-slow.log
This will display new log entries as they are added to the file.
Analyze the slow PHP requests by examining the log entries. Each log entry usually contains information about the script, duration, memory usage, and other relevant details. Look for patterns or specific scripts that consistently appear in the slow log.
Once you identify slow PHP requests, you can further investigate the underlying causes. Common areas to look into include database queries, resource-intensive operations, inefficient code, or external service calls.
Take appropriate actions to optimize the slow PHP requests. This could involve optimizing database queries, caching data, rewriting inefficient code, or scaling resources.
By following these steps, you can enable PHP-FPM slow log and effectively analyze slow PHP requests to improve the performance of your PHP applications.