Question realpath cache not working

[spark111]

Hi,
On my VPS with Plesk 12.5.3 realpath cache only lives for a few seconds.
Apache, Nginx witj PHP-FPM, http2 enabled, PHP 7. 4GB of memory, 2 core processor.
Opcache on, openbase_dir none.
Settings:
realpath_cache_size = 1024k
realpath_cache_ttl = "3600"

Hoster doesn't know.
Any idea how to solve this? Is this Plesk related?

Thanks.

 

[IgorG]

Settings:
realpath_cache_size = 1024k
realpath_cache_ttl = "3600"

Where you see these settings? Do you have the same values when you see subscription's phpinfo()? You can find phpinfo() link on page PHP Settings for subscription.

 

[spark111]

I put them there myself in de PHP-settings "additional configuration directives" box.
And yes, phpinfo() confirms.
I checked lifetime with the PHP print_r(realpath_cache_get()) and realpath_cache_size()

 

[spark111]

Hi,

Any clues?
It might also help to know, that the problem occurs with CentOS 6.8 installed.
The problem is the same with 2 of my other clients/customers.
Maybe I should have marked this as an issue?

Thanks for any help.
Regards.