How does WordPress use PHP threads?

[mouakter13]

We typically see a lot of unserviced requests on e-commerce sites and community forums . Therefore, these sites will require additional PHP threads to ensure that each request is processed without delays or downtime.

If your site is highly optimized or doesn't have a lot of PHP code (e.g. a complex theme or lots of WordPress plugins), then processing each request should happen almost instantly. Even with 2 PHP threads and 4 requests, all four requests would be handled very quickly.

Simply put, a PHP thread is a background process on a server that executes PHP code .

Before we get into how to optimize the use of PHP threads for WordPress, we need to first understand how WordPress uses PHP threads.

A typical request in a non-caching environment looks something like this:

The web server ( Nginx or Apache ) receives a request denmark phone number data from a visitor.
Nginx passes the request to PHP.
PHP queries the MySQL database as needed and uses your theme's PHP templates to generate an HTML page.
PHP delivers a rendered HTML page to the web server.
The page is served to the visitor.
In the process highlighted above, step 3 is the most time-consuming and resource-intensive (CPU and RAM). A highly optimized site with minimal database queries and efficient PHP code will get through step 3 relatively quickly.

In contrast, a site with poorly written PHP code that makes a lot of unnecessary database queries will spend much more time in step 3, meaning the requests will tie up PHP threads for longer periods of time.

The relationship between PHP threads and CPU
When it comes to WordPress performance, the ratio of PHP threads to available CPU is important to consider.

If lack of CPU resources is the main impediment to your site, increasing the number of PHP threads will not increase your site's performance – it will only allow your site to process more requests at the same time with slower throughput per request.