Optimization tips for OPcache configuration in PHP application performance optimization

By optimizing OPcache configuration, PHP application performance can be improved. Optimization includes: setting a reasonable opcache.memory_consumption size, increasing the value of opcache.max_accelerated_files, enabling opcache.revalidate_freq, disabling opcache.optimization_level

OPcache configuration in PHP application performance optimization Optimization Tips

Introduction

OPcache is an optimization tool for PHP applications that improves application performance by caching compiled PHP bytecode . By optimizing the OPcache configuration, you can significantly improve the execution speed of your PHP applications.

Optimization tips

1. Set a reasonable opcache.memory_consumption size

opcache.memory_consumption Sets the memory size used by OPcache to store cached bytecode. Smaller memory will result in low cache hit ratios, while larger memory will cause the machine to exhaust its memory prematurely. Depending on the size and frequency of use of the application, it is important to set this value appropriately.

// 示例配置：为应用程序分配 64MB 内存
opcache.memory_consumption=64

2. Increase the opcache.max_accelerated_files value

opcache.max_accelerated_files Limits the number of files that OPcache can cache. Smaller values ​​can result in frequent file cache purges, while larger values ​​can result in excessive memory consumption. Depending on the complexity of your application, adjust this value to a balance point.

// 示例配置：允许 OPcache 缓存多达 10000 个文件
opcache.max_accelerated_files=10000

3. Enable opcache.revalidate_freq

opcache.revalidate_freq Set the interval at which OPcache periodically checks the modification date of cached files. Enabling this feature ensures that files in the cache are up to date, but be aware that it increases CPU overhead. Choose this value wisely based on how often your application is modified.

// 示例配置：每 30 秒检查文件更新
opcache.revalidate_freq=30

4. Disable opcache.optimization_level

OPcache provides different bytecode optimization levels, but these optimizations may slightly reduce performance. In most cases, it is recommended to disable this option unless the application specifically requires optimization.

// 示例配置：禁用字节码优化
opcache.optimization_level=0

Practical case

We take a simple PHP application as an example to show how to optimize OPcache configuration in a Linux environment:

1. Create a PHP file named phpinfo.php, which contains the phpinfo(); function.
2. Run the following command in the terminal to get the current OPcache configuration:

php -i | grep opcache

3. Adjust according to the above optimization techniques/etc/php/7.4/opcache.ini OPcache settings in configuration file.
4. Restart the PHP-FPM service:

systemctl restart php-fpm

5. Run phpinfo.php again to see the impact of OPcache optimization.

   By implementing these optimization tips, you can significantly improve the performance of your PHP applications and reduce the load on your server.

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