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I'm using php-fpm configured to use file cache like this (php.ini):

opcache.enable=1
opcache.file_cache=/var/lib/hugetlbfs/group/www-data/pagesize-2MB
opcache.huge_code_pages=1

and by using debug.php:

<H1>This is normal HTML</H1>
But the <U>following table</U> is generated by PHP:
<?php
 phpinfo();
?>

I can see that Zend OPcache is up and running, the opcache is enabled and using my configuration; also opcache-gui is showing the memory being used. When I'm checking /var/lib/hugetlbfs/group/www-data/pagesize-2MB I discover that contains no file (sudo find /var/lib/hugetlbfs/group/www-data/pagesize-2MB -type f) and has 0 size (sudo du -sh /var/lib/hugetlbfs/group/www-data/pagesize-2MB); this also happens even while my php website is continuously stressed with requests. I do find though many directories (e.g. /var/lib/hugetlbfs/group/www-data/pagesize-2MB/0c5f279af5b0301d11f2fde4c3271f7d/.../php-pages/wordpress/wp-content) while also the huge code memory seems to be used:

grep Huge /proc/meminfo
AnonHugePages: 14336 kB
ShmemHugePages: 0 kB
HugePages_Total: 33
HugePages_Free: 18
HugePages_Rsvd: 18
HugePages_Surp: 1
Hugepagesize: 2048 kB

Q: shouldn't that pagesize-2MB directory contain some cached files? If not then why not? If yes then how should I fix this missing cached files?

PS: my configuration is below

• Ubuntu 16.04.5 LTS


• PHP 7.0.32-0ubuntu0.16.04.1


• using /usr/sbin/php-fpm7.0