Swoole asynchronous debugging tips: performance monitoring using Tideways

As Swoole becomes more and more popular in the PHP community, more and more developers are beginning to enjoy the excellent performance, high scalability and rich asynchronous programming capabilities brought by Swoole. However, when using Swoole for development, we will inevitably encounter various problems, one of the most common problems is performance bottlenecks. In order to solve this problem, we need an effective performance monitoring tool to help us analyze and optimize code performance. In this article, we will introduce how to use Tideways to perform performance monitoring of Swoole applications, and provide some practical debugging skills to help developers better use Tideways to analyze and optimize their code.

1. What are Tideways?

Tideways is a performance monitoring tool developed by a German company called Tideways GmbH. Its purpose is to provide efficient performance monitoring and problem diagnosis functions for PHP applications. Tideways uses a low-intrusion Agent mechanism that can capture application performance data in real-time and seamlessly in PHP applications for analysis and optimization.

Tideways provides a command line interface tool called Tideways CLI, which can be used to run and manage Tideways Agent. After installing Tideways CLI, we can start Tideways Agent by executing the following command:

$ tideways daemon start

After starting Tideways Agent, we can use Tideways for performance monitoring and problem diagnosis.

2. How to use Tideways in Swoole application?

To use Tideways in a Swoole application, we need to install the Tideways PHP extension and the Tideways Swoole extension through Composer. After the installation is complete, we can start Tideways with the following code:

<?php
// 加载Tideways扩展
if (extension_loaded('tideways')) {
    // 根据需要设置Tideways的配置
    $config = [
        'api_key' => 'YOUR_API_KEY',
        'sample_rate' => 100,
        'transaction_name' => 'default'
    ];
    tideways_enable($config);
}

// 加载Tideways Swoole扩展
if (extension_loaded('tideways_swoole')) {
    tideways_swoole_enable();
}

// 在Swoole的回调函数中使用Tideways
$http = new SwooleHttpServer("0.0.0.0", 9501);
$http->on('request', function ($request, $response) {
    // 使用Tideways开启一个事务
    tideways_transaction_start();

    // 处理业务逻辑
    handle_request($request, $response);

    // 使用Tideways结束当前事务
    tideways_transaction_end();
});

$http->start();

In this example, we first need to load the Tideways and Tideways Swoole extensions. We can then use the tideways_enable() function to enable Tideways and set some configuration as needed. In the Swoole callback function, we can start a new transaction by calling the tideways_transaction_start() function, and then end the current transaction by calling the tideways_transaction_end() function. In this way, we can use Tideways to monitor performance data in Swoole applications.

3. Tips for using Tideways for performance monitoring and analysis

After enabling Tideways, we can use the various functions provided by Tideways to monitor and analyze the performance of the Swoole application. Here are some practical tips.

1. Set transaction name and sampling rate

When developing a Swoole application, in order to better analyze performance data, we need to specify a meaningful name for each transaction, and Set an appropriate sampling rate. The transaction name should describe the logic of the current transaction processing as accurately as possible so that each transaction can be better identified and distinguished in subsequent data analysis. The sampling rate is a parameter that controls the amount of data collection and sampling accuracy. It can be adjusted according to the actual situation.

<?php
// 根据实际情况设定事务名称和采样率，并传入$config数组中
$config = [
    'transaction_name' => 'my_transaction_name',
    'sample_rate' => 50
];
tideways_enable($config);

2. Use XHProf Profiler for code analysis

Tideways supports using XHProf Profiler for code analysis. By enabling XHProf Profiler, we can understand which functions and methods in each transaction take the longest to execute, and which parts of the performance need further optimization.

When using XHProf Profiler, we need to do the following:

1. Enable XHProf:

tideways_xhprof_enable(TIDEWAYS_XHPROF_FLAGS_CPU | TIDEWAYS_XHPROF_FLAGS_MEMORY);

2. Perform performance analysis and stop XHProf:

$result = tideways_xhprof_disable();

3. Print performance data:

print_r($result);

For specific implementation, please refer to the following code:

<?php
// 启用XHProf Profiler
tideways_xhprof_enable(TIDEWAYS_XHPROF_FLAGS_CPU | TIDEWAYS_XHPROF_FLAGS_MEMORY);

// 执行一些业务逻辑
do_some_stuff();

// 停止XHProf Profiler并获取性能数据
$xhprof_data = tideways_xhprof_disable();

// 打印性能数据
print_r($xhprof_data);

After the program is completed, we can Execute the following command in the terminal to view performance data:

$ php -r "print_r(unserialize(file_get_contents('xhprof-data.xhprof')))"

Array
(
    [data] => Array
        (
            [my_program/1604976975.944807] => Array
                (
                    [wt] => 1604976962
                    [cpu] => 1215860
                    [mu] => 11700
                    [pmu] => 1604568
                    [samples] => Array
                        (
                            [main()] => Array
                                (
                                    [wt] => 1604976962
                                    [cpu] => 1215860
                                    [mu] => 11700
                                    [pmu] => 1604568
                                    [n] => 1
                                    [wt.1] => 1604976962
                                    [cpu.1] => 1215860
                                    [mu.1] => 11700
                                    [pmu.1] => 1604568
                                    [is_main] => 1
                                )
                            [my_function()] => Array
                                (
                                    [wt] => 10
                                    [cpu] => 10
                                    [mu] => 0
                                    [pmu] => 0
                                    [n] => 1
                                    [wt.1] => 10
                                    [cpu.1] => 10
                                    [mu.1] => 0
                                    [pmu.1] => 0
                                )
                        )
                )
        )
)

3. Use Tideways Traces for real-time analysis

Tideways Traces is a real-time performance monitoring and analysis tool in the Swoole application Very easy to use. Through Tideways Traces, we can view the processing time, resource consumption and other information of each transaction in real time to help us quickly identify performance bottlenecks and problems.

The specific steps to use Tideways Traces for real-time analysis are as follows:

1. Start Tideways Agent:

$ tideways daemon start

2. Enable Tideways:

$config = [
    'api_key' => 'YOUR_API_KEY'
];
tideways_enable($config);

3. Enable Tideways Traces:

tideways_enable_tracing();

After enabling Tideways Traces, we can view the processing status of each transaction in real time in the Tideways Dashboard. For specific usage methods, please refer to Tideways’ official documentation.

4. Summary

Using Tideways for performance monitoring and analysis is a very practical skill, which is particularly important in Swoole application development. Through the method introduced in this article, we can easily enable Tideways and use the various functions it provides to perform performance analysis of the Swoole application in order to better optimize and improve the application. Of course, Tideways is just one of many performance monitoring tools. We can also choose other appropriate tools for performance monitoring and analysis based on the actual situation.

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