topic Re: Excessive memory usage for PHP-FPM in Container platforms

Excessive memory usage for PHP-FPM

enricostahn — Mon, 18 Nov 2019 03:05:33 GMT

What is the memory overhead added by Dynatrace? Just looking at Nginx and now PHP-FPM it seems fairly excessive.

I have just enabled for PHP-FPM and memory consumption went from 160ish to 400ish.

Re: Excessive memory usage for PHP-FPM

skrystosik — Mon, 18 Nov 2019 07:34:07 GMT

It should not be like that. I suggest opening support ticket for this case.

Sebastian

Re: Excessive memory usage for PHP-FPM

Julius_Loman — Mon, 18 Nov 2019 07:54:39 GMT

Around 200MB increase should be OK according to the docs. Do you have any request attributes defined or SQL bind variables capture turned on? Have you increased the limit of new purepaths to be caputred from the default (1000/minute)? (Dynatrace Managed only)

There are several cases when the footprint becomes slightly larger.

Re: Excessive memory usage for PHP-FPM

enricostahn — Mon, 18 Nov 2019 21:08:51 GMT

@Julius L. I have not adjusted any thresholds. It’s a fairly new installation with none of the adjustments you mentioned.

We had the same issues with Nginx. The root-cause was that Nginx has too many workers. After reducing the workers to 1 the memory overhead became a lot less.

Unfortunately we don’t have the same luxury with PHP-FPM.

I will keep monitoring it over the next week and report back.