Ubuntu 10.04 porting from x64 to x32 + creating a custom kernel with PAE?

Question

ubuntu

Actually the question is 1. Is it possible to switch from ubuntu x64 to x32 without reinstalling the system itself?
I just have a problem with a working laptop 4 gb of RAM is clearly not enough. I run eclipse tomcat and maven, and that's it ... on x64 memory consumption is 90%. And in order to test the site, my chromium hangs with 3 maximum 5 tabs.
I want to switch to x32 because everything will eat almost half as much memory, and PAE will give access to all 4 gigabytes of memory.
Question 2.
If you build a custom kernel, will it be possible to immediately build it with PAE inside, and just do it make sense in a custom kernel on ubuntu? Just recently there was an article that said that there is and will be profit, but experienced people at work say that there are no show-offs on modern cores.

Answer 1

1.
> I want to switch to x32 because everything will eat almost half as much memory
Actually, why would the system lose weight so drastically? x86 consumes less memory, but the difference is not so dramatic.
If you have a normally partitioned disk (/ and /home, then the move will be relatively painless) + the swap partition has not interfered with anyone yet
X86-64 and x86 are two different builds of the distribution. Their repositories also differ. In theory, you can try to make x86 from x86-64 (replace x64-86 packages with x86), but in fact it will be easier to install a new system.
2. EnablingPAE . Ubuntu will install PAE itself during installation if it detects > 3Gb of memory.
There is not much point in a custom kernel if:
- you do not have special hardware for which you need to build a module
- you do not plan to tune the core, you do not need special buns (for example, RT core (but it is also in turnips)) (obviously not)

Answer 2

Well, I don’t know why a data array of 1 gigabyte in a 32-bit system will fit into a piece of memory from half a gigabyte, do you think memory compression is used on a 32-bit system and everything takes up twice there?
At the expense of saving memory twice, you are delirious.