-j option for kenel makes?

liquiz · n00b Joined: 08 Oct 2004 Posts: 38

Hello Folks

I finally got my dual proc system up and running, or I should say my 1st one and I was wondering several things.

This is BTW a dual athlon mp system on a tyan motherboard with 2gig of ram.
The 2nd system when done will be a sparc system.

Where/what line do modify in the kernel Makefile to have make take advantage of 2 processors.

Currently Im using the 2.4x tree but Ill be switching over when all the hardware (still missing the raid card) is ready.

Peace
Liquiz

Chaosite · Posted: Sun Oct 17, 2004 2:53 pm Post subject:

Nothing. Just use "make -j3 ..."

n3mo · Posted: Sun Oct 17, 2004 2:53 pm Post subject:

You set the -j options in /etc/make.conf as for any other compilation job.

liquiz · n00b Joined: 08 Oct 2004 Posts: 38

From what I have read and what I have seen here is what I think

If you pass make -j3 that only the first make inherits the -j3

The Kernel Makefile seems to override the make.conf since when the compile is done its with the O2 instead of the O3 that I have in the make.conf.

Your dual xeon is probably hypterhread enabled which means that you have virtually 4 processors so thats why the j5 works better for you

Im trying out using make bzImage modules [MAKE ="make -j3"] right now to see how things work.

Peace,
Liquiz

mike4148 · l33t Joined: 09 Sep 2003 Posts: 641

Running make -j3 here when building the kernel is building tons of things in parallel (obvious because of the randomness of the output) (kernel = gentoo-dev-sources-2.6.8-r4, amd64).