I am working on an old workstation running fedora5. Every time I move a window or click to use a program function, a pop-up window opens with this text "The swap space on your system is dangerously low. Please kill some processes..." In 5 minutes working, I can get more than twenty pop-up windows like that, that I need to close to pursue my work, which is very annoying.

I don't want to try to increase swap because the system is running very well except those pop-ups and I don't want to risk to make it unstable since it is very old and run precious outdated softwares.

I am looking on a simple way to disable the appearance of those pop-ups. Any ideas?

Thank you

Sorry, there is no good answer for you. If you don't want to increase swap space, then you're stuck. There is a **REASON** you get those messages. And your system cannot be doing anything important at all if you're still using Fedora Core 5, which went end-of-life ELEVEN YEARS AGO.

Either do what the system is telling you, or live with the pop-ups. Best solution would be to load something CURRENT, which isn't insecure/outdated.

OK thanks. I think I may try to increase SWAP space.

The reason why I have to use this outdated system is because I must use a licensed software that is no longer supported and that is only installed on that machine.

You can simply create a swap file and add that to the system with swapon - no need to mess with the current set-up other than to update fstab once it's all working ok.
I too wouldn't normally recommend keeping such an old system, but I have a similar situation that requires me to keep a XP system. I make sure it is unable to connect to my normal network, or the internet.

back in 2006 when i ran FC 5 i had only a 1 gig swap partition and 512 meg of ram

Gnome2 ran just fine

if SWAP is a partition and not the /tmp folder you can just add the /tmp folder to the swap space

Can you install fc5 on a KVM in RHEL7.4 or SUSE
i would not recommend using fedora 27 or 28 for running the KVM