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Recently I updated my instance of Next Cloud to version 23.0.3, in the process
of doing so, I received this warning:
The OPcache interned strings buffer is nearly full. To assure that repeating
strings can be effectively cached, it is recommended to apply
opcache.interned_strings_buffer to your PHP configuration with a value higher
than 8.
So, I took a little stroll online and checked into it a bit. Several people
were reporting it as a bug [1], but in reality, this isn’t the case. NC 23 now
just checks to see if your opcache.interned_strings_buffer is more than 90%
full. If it is, it flags this warning. I looked through the documentation for
NC, and at this time, it doesn’t include any info for recommended
strings_buffer settings [2].
But, in either event, I know that my server is running NC, and a Piwigo photo
server, and a WordPress instance. These three combined could certainly overtake
the amount of default memory assigned to the strings_buffer for PHP. With that
in mind, I went ahead and increased it.
I went to /etc/php/7.4/apache2/php.ini and made the following edit:
;opcache.interned_strings_buffer=8\nopcache.interned_strings_buffer=32
After saving the file, a quick “# systemctl restart apache2” was all that was
needed, and the warning went away. I’ll have to check back on it over time, as
I know sometimes it takes a while for the buffer to get full. If I don’t post
about it again, assume that it worked just fine.
Linux – keep it simple.
References:
[1] https://github.com/nextcloud/server/issues/31223
[2]_https://docs.nextcloud.com/server/23/admin_manual/installation/
server_tuning.html#enable-php-opcache