PHP8.1 released: Introducing JIT compiler to improve performance

PHP8.1 released: Introducing JIT compiler to improve performance

Recently, the PHP programming language has ushered in a highly anticipated new version-PHP8.1. This version introduces a major improvement, namely the introduction of the Just-in-Time (JIT) compiler. According to officials, this improvement will greatly improve the performance of PHP code. This article will take you to understand the JIT compiler of PHP8.1 and how it can help us optimize code performance.

The working principle of the JIT compiler is to instantly compile frequently executed code blocks into machine code and cache them for subsequent use. Compared with the traditional PHP interpreter, the introduction of the JIT compiler means that PHP code will run in a closer to native manner, resulting in significant improvements in performance. Users can use this feature by enabling JIT in the PHP configuration file, setting opcache.enable_jit=1 in the php.ini file.

In order to better understand the performance improvement effect of the JIT compiler, we can write a simple sample code and test it using PHP8.1. The following is a function that calculates the Fibonacci sequence:

function fibonacci($n) {
   if ($n <= 0) {
       return 0;
   } elseif ($n == 1) {
       return 1;
   } else {
       return fibonacci($n - 1) + fibonacci($n - 2);
   }
}

$start = microtime(true);

echo fibonacci(40) . "
";

$end = microtime(true);

$executionTime = $end - $start;
echo 'Execution time: ' . $executionTime . ' seconds' . "
";

In the above code, we use recursion to calculate the 40th term of the Fibonacci sequence and output the time spent in the calculation. We can run this code to see the execution time under PHP8.1.

Before running, please make sure you have PHP8.1 installed and the JIT compiler enabled. Run the following command in the command line to execute the above code:

php -d opcache.enable=1 -d opcache.enable_cli=1 -d opcache.jit_buffer_size=100M -d opcache.jit=1235 -d opcache.jit_debug=0 -d opcache.jit_bisect=0 jit_test.php

After the code is executed, you will see the 40th term of the Fibonacci sequence and the time taken for the calculation output on the screen. You can try running this code multiple times to observe the difference in performance.

Without the JIT compiler enabled, the execution time of this code may be very long, especially when calculating large Fibonacci numbers. However, when you enable the JIT compiler, you will observe a significant speedup. This is because the JIT compiler will optimize the calculation process of recursive calls into native machine code, thereby avoiding some repeated calculation steps and greatly improving execution efficiency.

In addition to the introduction of the JIT compiler, PHP8.1 also brings many other improvements and new features, such as better type safety support, more powerful pattern matching, new predefined classes and functions etc. The introduction of these features has greatly enhanced PHP's development capabilities and overall performance.

To sum up, the JIT compiler of PHP8.1 provides us with a new way to optimize code performance. By properly using the JIT compiler, we can significantly improve the execution efficiency of PHP code, thereby improving the overall performance and response speed of the application. At the same time, we should also pay attention to the usage scenarios and restrictions of the JIT compiler to avoid unnecessary overhead and problems.

We hope that through the introduction and sample code of this article, readers will have a deeper understanding of the JIT compiler of PHP8.1, and can effectively use this feature in their own development practices to improve PHP applications. performance and user experience.

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