26.0 PHP extension sysvsem

ℹ️ Support
1

Nextcloud 26 wants the PHP extension sysvsem to be enabled, which was not the case in version 25. What is the difference?

2

I’m not a developer, so I’m not sure. Either it is a new requirement or it was enabled on your system before and now it isn’t? But anyway, if Nextcloud says it would like to use this extension, I would just install it.

Unfortunately, you didn’t provide any details about your instance at all, so I can only say that with PHP ≥8.0, on Debian / Ubuntu based distributions, sysvsem is included in php-common and should be enabled by default after installing the package. In other distributions and / or with older PHP versions it might be a separate package.

3

We are on PHP 8.1. The extension sysvsem wasn’t enabled before, I can enable it, no problem. However NC seems to be slower when it’s enabled (subjective observation).

4

Sorry, not an expert on this… Maybe someone else can explain what it does or how it might impact performance.

5

It limits the amounts of previews getting generated at the same time. See Limit number of concurrent preview generations by dbw9580 · Pull Request #18210 · nextcloud/server · GitHub
You can adjust the config with preview_concurrency_all and preview_concurrency_new if the defaults should be too low for your system.

3 Likes
6

How exactly did you enable the module? In what config file?
Im running php8.1 (apache2) on opensuse but I don’t know how to enable this module, is it installed by default?

thanks in advance

7

Yes.

You can see with:

php -i | grep sysvsem
8

ok thanks! so:

php -i | grep sysvsem : --enable-sysvsem=shared
php -m | grep : no output

So this means I need to activate the module somewhere, but after a lot of Googling I cannot find in which configuration file I need to do this on opensuse,
in what folders can I look?

For Debian based Linuxes there is: phpenmodule
But how to do it with RedHat based distributions?

Thanks in advance

9

I am no suze expert but as far as I can see (searching in the same internet), there is a package php8-sysvsem on suze.

Try something like this:

su -

enter rootpassword
than run the following commmands:

zypper refresh
zypper install php8-sysvsem

But as I wrote, I am not a suze expert.

https://software.opensuse.org/download/package?package=php8-sysvsem&project=openSUSE%3AFactory

10

I was reading everywhere I needed to “enable” or “activate” the php module as it is already included in apache2-php. And I could not find where or how…

but no one told me before I just needed to install it trough my package manager (zypper)

so I own you a big thank you for this simple solution!

1 Like