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i'll take a better look at the guide when i got more time
What ever works for you.
This is inaccurate. No user should be root. Most distros specifically don't have a root password. I suspect that you are mixing up user permissions with the Windows concept of Administrator accounts.
Make sure you have the root password for commands that require to be ran as root.
Sorry, I'll fix that ASAP!
Oh, it may be worth mentioning that some distributions/tools (GUI tools) allow creating users as "administrators" (automatically adding them to the wheell group and sudoers file) besides the whole useradd options, which is obviously the most robust approach.
I have used Ubuntu in the past, though never really enjoyed.
New linux users will have a lot to play around with :) Great! Keep it going.
Yes, if you can guarantee that you always have more memory then the processes you are running would ever need, you don't need swap.
Also, if you type "free" on the command prompt and see that you actually have used swap (assuming you have it), that is a sign that you are occasionally going over the amount of memory you have. Maybe you need to consider bying more. Maybe not, see below.
Linux (unlike some other operating systems) is very good in using swap and memory.
Basically, as long as you have "free" real memory, linux will try to use that memory as extra buffers and caches, to speed up what you are doing. So, it is perfectly normal to see "all memory is in use" - whatever was not needed by your processes was allocated to speed up things you might potentially be doing next.
But if you actually need that memory, it will be taken away from that buffering/caching, and your processes will get it.
Now, the swap is typically only used if your processes need more memory than you have. Without swap, linux will in that case just coldly murder some process to be able to keep the others running.
With swap, in that case, linux will swap out some memory of some process which does not seem to be doing anything useful with it. In many cases, those processes are not actually doing anything time critical - if they want to do something with that memory, they will get it back when needed - which is slow, yes.
But, linux would never swap out memory from a process which is actually doing heavy work with it (like your game). As long as you have enough memory for all of the processes which actually do heavy work with the memory they use.
So, normally:
- with swap: some of the lazier processes will become slower if you run out of memory.
- without swap: some process (maybe your game) will just die if you run out of memory.
If you have swap, you can run efficiently all of the things which need to be run efficiently, and in addition to that, you can run some stuff which is not so critical even if the total memory used would be more than you have. If you don't have swap, something just dies when you use more memory than you have.
Swap has a bad reputation because some operating systems were very bad in using it - I hear some even used it for caches ... swapping a memory cache for disk to disk, so that the disk reads would be sped up by reading from the disk, instead of reading from the disk ... and swapping critical processes out so that it could get that cache back to memory so that the critical procss could read from that cache... even if the process was just slowed by a factor of 1000 by being swapped out ... ???
Even those operating systems are not as bad as that anymore, if they ever were.
But with linux, having swap will only help. Not at all, if you have more memory than you need, but if you ever overflow slightly, you will not suffer. If you overflow a lot, you will be slowed. But better that than processes just dying from the lack of memory.