Is there any utility for RAM like FreeRAM XP Pro for Windows? I have 768MB RAM, although I have left only 40-50MB when I load X without any applications running.

This is normal. Linux caches a lot to reduce disk access and processes that have been started before will start faster the second time. If another process requires RAM it will be freed by the kernel. You really do not need a RAM manager.

Ok but when I'm opening a new, small application like juk for example, is decreasing the RAM around 20, something that makes the system a little bit slower (or is it my idea? but because of that I was currious about the RAM size). Is this normal?

Memory usage shouldn't be something that concerns you, swap usage on the other hand... It doesn't really matter if your RAM always looks like its full, however if your swap partition is seeing a lot of the action then it is a problem. Swap is a whole lot slower than physical memory.

I see... In fact, I don't have any swap partition and for the swap says that there's no space available. Should I create a swap partition or something?

It probably would be a good idea. When you use apps the get cached in memory (obviously). When you're done, the kernel leaves them there so next time you use it that part will already be done. Your memory gets "full" and you open a new app but the kernel just checks what is already in RAM and removes stuff it's not using anymore to make room for your new app. Sound easy so far? Well when it runs out of space cause you are actively using everything that is in RAM then it starts using swap. Swap is like pretend RAM on your hard drive, it's way slower but if it's needed then i gets used.

If your memory was flat full up and the kernel didn't have any swap to fall back on it'll start trying to dump stuff that's being used and it'd be a mess. I've seen this explained really well around here somewhere but I can't find a link 768MB is a decent amount of ram but I'd probably have a 512MB swap just in case.

Thanks a lot for the information! FI'll create a swap partition for any case...

Is there a way for cleaning up the RAM manually?

I don't think so. (maybe by rebooting ) You dont need it.
Linux tries to use as much ram as possible to work better. Create a swap. Personally I don't think you need more that 128 or 256MB of swap.
I have 1G of ram and now it's full:
But it does not use any swap and this is what matters. Having RAM and not using it is something really stupid. Why not chache applications so they can run faster when you re-open them?
I had the same problem with you, but having a full Ram Is not a problem as long as the OS does not use a lot of swap. When It actually needs ram linux will remove the cashed stuff.

Thanks all of you for the information... Να 'σε καλά perfect_circle

Well, I've created a 512 swap partition but when I open the Perfomance Monitor says again that there's no swap space available...

DID you tell slack to use it?
I guess not...SO, open the file /etc/fstab and assuming that the swap partition is hda2, put this line in there:
you can find out if you don't know it already, which partition the swap is by using this command:(that's a small L, not a 1)
Then reboot

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