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This article is about how php sets the number of concurrent connections. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Php sets the number of concurrent connections: 1, find php-fpm.conf configuration; 2, edit options [pm= static], [request_terminate_timeout], [pm.max_requests].

This article operating environment: windows10 system, php 7, thinkpad T480 computer.

First of all, we need to find the php-fpm.conf configuration in the server (or possibly in the introduced www.fong configuration)

Find the following:

[global] pid = / usr/local/php/var/run/php-fpm.piderror_log = / usr/local/php/var/log/php-fpm.loglog_level = notice [www] listen = / tmp/php-cgi.socklisten.backlog =-1listen.allowed_clients = 127.0.0.1listen.owner = wwwlisten.group = wwwlisten.mode = 0666user = wwwgroup = wwwpm = staticpm.max_children = 200pm.start_servers = 40pm.min_spare_servers = 10pm.max_spare_servers = 20pm .max _ requests=1000request_terminate_timeout = 100request_slowlog_timeout = 0slowlog = var/log/slow.log

Pm.max_children=30pm.max_requests=500pm.start_servers=4pm.max_spare_servers=30

one。 Pm= static

First of all, let's talk about the value of pm, pm = dynamic, the number of processes that are php is dynamic, and it will increase back and forth based on the number of visitors.

In the high-load php environment, I recommend setting the number of pm= static php-fpm processes to be fixed.

two。 Pm.max_children=???

When using the number of processes in static mode to determine the number of processes based on pm.max_children, then the question comes how much php-fpm should my server set?

From a theoretical point of view, the more php-fpm processes, the better, which means that a hotel has enough waiters to serve you, and you don't have to wait.

But... no, no, no. no, no, no. In reality, it is always cruel that the number of php-fpm processes will be limited by the size of your memory. In general, the number of our processes is divided by machine memory (M) divided by 2 and divided by 20 (M)

Of course, this is not absolute. You need to know:

How much memory can you allocate to php: is there any other mysql that consumes more memory on your server than the php server? How much memory per php-fpm you have: how much memory it takes depends on the quality of your php code and the related business you handle. Of course, you can use the command to count the average memory footprint of your php-fpm.

Some people will ask me what will happen if the setting is not appropriate.

When the value is too small, the request to nginx will not be assigned to the php-fpm process, resulting in a 502 error.

When the number is too large, if there is no large number of visits, if the traffic is large, then the memory will be used up by php. Causes the system to respond slowly, cpu-system increases, and the system constantly adjusts memory allocation.

In severe cases, it will result in a higher cup-wait, a higher memory, and a straight increase in the io of the direct write disk. Cpu usage is also beginning to fill up. (as shown in the figure)

III. Request _ terminate_timeout

The calculation is as follows: if your server performance is good enough, and the broadband resources are sufficient, and the PHP script does not have loops or BUG, you can directly set "request_terminate_timeout" to 0s. 0s means to keep the PHP-CGI running without a time limit.

And if you can't do this, that is to say, there may be a BUG in your PHP-CGI, or your broadband is insufficient or some other reason causes your PHP-CGI to fake death, then it is recommended that you assign a value to "request_terminate_timeout", which can be set according to the performance of your server.

Generally speaking, the better the performance, the higher you can set it, 20-30 minutes. Because my server PHP script takes a long time to run, some of it may take more than 10 minutes, so I set it for 900s, which does not cause the PHP-CGI to die and cause the error of 502Bad gateway.

IV. Pm.max_requests

This parameter means that the php-fpm worker process automatically restarts after processing how many requests, the main purpose is to control the memory overflow during request processing, so that the memory footprint is within an acceptable range. It is more suitable for the server to carry items that are messy, and some requests will take up memory.

Resulting in a relatively large php-fpm footprint. After a certain number of requests, the process will be terminated, freeing up your own memory. If this value is too small, it will cause all working processes to reach this value almost at the same time and enter a state that needs to be restarted. When all working processes are restarted at the same time, it will occur in the

PHP will stop responding for seconds or more until all processes are restarted. This is unacceptable, so I usually set this value to the time difference between the restart of the first process and the restart of the last process when the first batch of workers reaches this value after PHP startup.

For more than 1 minute, the difference will be widened to about 5 minutes on a stressful night, and the negative impact of process restart on the server can be ignored.

Here are a few additional commands to count php-fpm-related data

1. Check the number of processes in php-fpm

Ps-ef | grep "php-fpm" | grep "pool" | wc-l

2. Check the amount of memory consumed by each php-fpm

Ps-ylC php-fpm-- sort:rss

3. Check the average memory footprint of PHP-FPM on your machine

Ps-- no-headers-o "rss,cmd"-C php-fpm | awk'{sum+=$1} END {printf ("% d% s\ n", sum/NR/1024, "M")}'

4. View the details of memory consumption by a single php-fpm process

Pmap $(pgrep php-fpm) | less

Restart php-fpm

1. Stop the command pkill php-fpm 2. Restart or start the command php-fpm-R or / alidata/server/php/sbin/php-fpm. Thank you for reading! This is the end of the article on "how to set the number of concurrent connections in php". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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