How to optimize PHP application CPU usage using Memcached caching technology?

With the development of the Internet, PHP applications are becoming more and more common in the field of Internet applications. However, high concurrent access by PHP applications can lead to high CPU usage on the server, thus affecting the performance of the application. In order to optimize the performance of PHP applications, Memcached caching technology has become a good choice. This article will introduce how to use Memcached caching technology to optimize the CPU usage of PHP applications.

Introduction to Memcached caching technology

Memcached is a memory-based caching technology that can improve the performance of web applications. It is a distributed caching system that has been used to optimize many large-scale Internet applications. Memcached can be used to store frequently accessed data in memory, thereby reducing access to the database and improving application response speed.

Install Memcached

Before using Memcached, you need to install the Memcached extension. It can be installed through the following command:

sudo apt-get install php-memcached

After the installation is complete, you need to add the following code in the php.ini file:

extension=memcached.so

Use Memcached to optimize PHP applications

Once installed With the Memcached extension, you can start using Memcached for caching. Here’s how to use Memcached to optimize PHP applications:

1. Frequently accessed data

Storing frequently accessed data in the Memcached cache can reduce database access , thereby improving application performance. For example, when a user performs a search operation on the website, the search results can be stored in the Memcached cache, so that the next time the user performs the same search operation, the search results can be read directly from the cache without having to read them from the database again. Read.

The following is a simple example:

$memcache = new Memcached();
$memcache->addServer('localhost', 11211);

$searchResults = $memcache->get('searchResults');

if (!$searchResults) {
    // Execute search query
    $searchResults = executeSearchQuery();
    $memcache->set('searchResults', $searchResults, MEMCACHE_COMPRESSED, 60);
}

return $searchResults;

2. Object cache

Storing objects in the cache can reduce access to the database, thereby improving Application performance. For example, when you need to obtain a user's personal information from the database, you can store the user information in the Memcached cache.

The following is a simple example:

$memcache = new Memcached();
$memcache->addServer('localhost', 11211);

$userData = $memcache->get('userData_' . $userId);

if (!$userData) {
    // Execute database query
    $userData = executeDatabaseQuery();
    $memcache->set('userData_' . $userId, $userData, MEMCACHE_COMPRESSED, 60);
}

return $userData;

3. Cache results

Storing the results of the function in the cache can reduce the time of repeated calculations, thereby improving application performance. For example, when you need to calculate a certain value, you can store the result in Memcached cache.

The following is a simple example:

function calculateValue($value) {
    $memcache = new Memcached();
    $memcache->addServer('localhost', 11211);

    $cachedValue = $memcache->get('cachedValue_' . $value);

    if ($cachedValue) {
        return $cachedValue;
    } else {
        // Calculate value
        $calculatedValue = $value * 2;
        $memcache->set('cachedValue_' . $value, $calculatedValue, MEMCACHE_COMPRESSED, 60);
        return $calculatedValue;
    }
}

Conclusion

Using Memcached caching technology to optimize the CPU usage of PHP applications can improve the performance and response speed of the application, Reduce access to the database, thereby reducing the CPU load on the server. Before using Memcached, you need to install the Memcached extension and configure the php.ini file. Memcached can then be used to optimize PHP applications by storing frequently accessed data, objects, and function results in cache.

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