On 18/12/2023 21:40, Steve Parry wrote:
Hi Everyone.
I’m a hobby programmer, so please be kind😊
I’m investigating a performance degradation that I have between PHP8.0
and PHP8.1. I see a couple of similar issues being raised but no
resolutions that I’ve found.
In my live WordPress system I have HTML/Java scripts that make
multiple ajax calls to PHP scripts on the remote hosted web server. On
upgrading to 8.1 the number of ajax calls failing with timeout
increased dramatically by a factor of between 4 to 8 depending on the
frequency of calls at any one time.
Examination of a comparison showed scripts were taking up to 15
seconds under PHP8.1 compared to 1-2 seconds on PHP8.0.
To isolate the issue I created a simple (non-WordPress) web script
that on the click of an icon uses ajax to send a retrieve request to a
server script. The server test script simply immediately returns one
piece of hardcoded dummy jSON data with no processing.
Based on the Chrome debugger Network tab, the time of the network
calls triggered from the test script under PHP8.0 are a response of
around 25mS. Under 8.1 the timings are average 92mS. A factor of
about 3.7 slower under 8.1. This has been consistent on two separate
servers.
My conclusion at this point is that my test setup is reflecting the
same (or worse) time delay factor between PHP8.1 and PHP8.0 as I am
having on the full site. As my test setup is pure HTML/Javascript and
PHP on the server I think this might be an issue with PHP8.1.
Any advice or assistance is keenly welcomed! Thank you in advance.
Happy to share my scripts and the URL to the test script.
Cheers
…Steve
Hi Steve
Seems strange to me.. a couple of questions...
Are the 2 PHP versions configured exactly the same? For example do both
have opcache enabled?
When you ran your comparison tests you ran them using the same server I
presume?
Are you restarting the services i.e. Apache/PHP-FPM between each test?
Rich
