How to limit memory size used by specific application in KDE?

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KDE runs applications as systemd services (How does KDE use systemd to run applications as services?).

If I wanted to limit the size of memory used by specific application using systemd directives MemoryHigh and MemoryMax how can I do it?

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man systemctl then look for set-property.

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To use systemctl set-property you need to know the name of unit file but this name (as shown in my other linked question) is dynamic (looks like app-org.kde.krusader@2afd24ec5acc40599209dbdba916b96a.service ) and not presented when starting application.

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If you want to set that for all apps, put it in ~/.config/systemd/user/app-.service.d/*.conf should do the job.

For a specific application, you might have to modify the desktop file, and wrap the command line in a shell script. You can get the systemd unit name from cat /proc/$$/cgroup.

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You can change config for a single app with overrides like ~/.config/system/user/app-org.kde.kwrite@.service.d/*.conf. Systemd treats the part after “@” as a parameter to a template, so you can override the template.

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Jin Liu described in details (thank you Jin!) how this can be done in the blog post Limit Application Memory Usage with systemd - KDE Blogs
There’s a companion discussion topic at Limit Application Memory Usage with systemd - KDE Blogs if anyone has any further questions regarding this topic.

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