Ubuntu

Kernel compile seems to be longer/larger than reasonably expected?

Asked by Roger Goeb

I have experience with Centos 7, but none with Ubuntu.
I installed what I believe to be the latest version of Ubuntu, and have installed kernel sources (5.8.10).
uname -r returns "5.8.0-44-generic".

My questions is, how do I compile a single version of the kernel specific to the OS I am compiling on?
Currently, my last compile ran 14 hours (initial compile on Centos 7 was 2-4 hours) and the resulting files generated ate up over 20G's of disk space.

I then found this link - https://help.ubuntu.com/community/Kernel/Compile
which contained these instructions -

"to build a specific target, use this command:

fakeroot debian/rules clean
AUTOBUILD=1 NOEXTRAS=1 fakeroot debian/rules binary-FLAVOUR
Where FLAVOUR is one of the main flavours of the kernel (e.g. generic)"

so I ran -

fakeroot debian/rules clean
sudo AUTOBUILD=1 NOEXTRAS=1 fakeroot debian/rules binary-generic

I did this and am currently 5 hours into the compile and have increased disk usage by aroungd10G.

Does anyone know what I might be doing wrong? I simply want to compile an original kernel source without any modifications and prove that I can compile and install properly. At that point I can then merge some modifications into the code and watch it blow up.

Thanks in advance,
Roger

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Manfred Hampl (m-hampl) said : 		#1

Quote from https://help.ubuntu.com/community/Kernel/Compile#Build_the_Kernel.28s.29

If you have a more than one processor or more than one core, you can speed things up by running concurrent compile commands. Prepend CONCURRENCY_LEVEL=2 for two processors or two cores; replace '2' with whatever number suits your hardware setup (for Gutsy and later, you can alternatively use DEB_BUILD_OPTIONS=parallel=2).

fakeroot debian/rules clean
DEB_BUILD_OPTIONS=parallel=2 AUTOBUILD=1 NOEXTRAS=1 fakeroot debian/rules binary-generic

Remark: Why do you compile with sudo? sudo is only needed for installing the kernel after building, but should not be used for compiling.

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