With the rapid development of modern Internet applications, user experience is crucial to the success of an application. How to ensure high performance and high availability of applications has become one of the important issues that developers need to solve. As one of the widely used programming languages, PHP's performance monitoring and optimization are also very important.
Memcached is a high-performance, distributed memory object caching system that can help applications improve performance and scalability. This article will introduce how to use PHP and Memcached to implement performance monitoring.
1. Working principle of Memcached
The official document defines Memcached as follows: "Memcached is a high-performance distributed memory object caching system that can be used in dynamic web applications to reduce database load. ." Its working principle is to cache data into memory. If there is a request for the same data, it can be read directly from memory.
When specifically using Memcached, the data that needs to be cached will be placed in a key-value pair, so that when the data needs to be called, it can be quickly read from the memory. For PHP applications, this key-value pair can be stored in memory to avoid calling the database query every time.
2. How to integrate PHP with Memcached
PHP can be integrated with Memcached through some extension libraries. The most commonly used ones are Memcached extension and Memcache extension. Their usage and implementation are very similar. This article uses Memcached extension as an example.
First you need to install the Memcached service and introduce the extension into PHP. For specific operations, please refer to the following commands:
sudo apt-get install memcached sudo apt-get install php-memcached
After the installation is completed, you can use the following code in the PHP code to cache data:
$memcached = new Memcached(); $memcached->addServer('127.0.0.1', 11211); $key = 'example_key'; $data = 'example_value'; $memcached->set($key, $data);
This code first creates a Memcached instance, and Added a local server. Next, a cached key-value pair is defined and then stored in Memcached using the set() method.
3. Use Stats API to monitor the performance of Memcached
In PHP applications, you can monitor the performance of Memcached through the built-in Stats API. It provides methods to obtain Memcached statistical information, such as cache hit rate, expiration time, cache space occupied, etc.
The following code demonstrates how to use the Stats API to obtain some performance information of Memcached:
$memcached = new Memcached(); $memcached->addServer('127.0.0.1', 11211); $stats = $memcached->getStats(); echo "Memcached key count: " . $stats['curr_items'] . " "; echo "Memcached hit rate: " . $stats['get_hits'] / ($stats['get_misses'] + $stats['get_hits']) . " ";
This code obtains the number of key-value pairs currently stored in Memcached and calculates the cache hit rate.
Through the Stats API, we can obtain some basic information about Memcached, but this information reflects the performance of the entire Memcached system and cannot provide refined monitoring and adjustment. Next, we will introduce how to use the extension library to achieve more refined performance monitoring.
4. Use the Memcached PHP extension to obtain more detailed statistical information
The methods provided by the Memcached PHP extension are richer than the built-in Stats API, and can obtain more specific and accurate statistical information. The following code shows how to use the getStats() method in the extension to obtain Memcached statistics:
$memcached = new Memcached(); $memcached->addServer('127.0.0.1', 11211); $stats = $memcached->getStats(); foreach ($stats as $server => $s) { foreach ($s as $key => $value) { echo "$server:$key=$value "; } }
This code first creates a Memcached instance and adds a local server. Next, use the getStats() method to obtain Memcached statistical information, and use a foreach loop to traverse the output results.
In addition to these basic information, the Memcached PHP extension also provides some useful methods to monitor and adjust the performance of Memcached, such as getServerList(), getVersion(), etc.
5. Use Memcached monitoring tools
In addition to PHP’s own Stats API and Memcached PHP extension, there are also some monitoring tools that can help us monitor and adjust the performance of Memcached more conveniently.
- Memcached management interface
Memcached provides a web management interface that can be used to manage and monitor the Memcached service, such as viewing cached key-value pairs and observing Memcached running status. As well as add/remove servers and more.
In Ubuntu system, you can use the following command to install the Memcached management interface:
sudo apt-get install php-memcache sudo service apache2 restart
After installation, visit "http://localhost/memcache.php" in the browser .
- Munin Monitoring Tool
Munin is a commonly used server performance monitoring tool that can be used to monitor the running status of Memcached. It provides rich charts and statistical information for easy performance analysis and adjustment.
Under Ubuntu system, you can use the following command to install Munin:
sudo apt-get install munin munin-node
After the installation is complete, just visit "http://localhost/munin" in the browser.
6. Conclusion
This article introduces how to use PHP and Memcached to implement performance monitoring. By using Stats API, Memcached PHP extension and monitoring tools, Memcached performance analysis and adjustment can be more conveniently performed. I hope this article is helpful to you, thank you for reading!
The above is the detailed content of PHP and Memcached performance monitoring. For more information, please follow other related articles on the PHP Chinese website!

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Atom editor mac version download
The most popular open source editor

SublimeText3 Linux new version
SublimeText3 Linux latest version

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

Zend Studio 13.0.1
Powerful PHP integrated development environment

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.