svn commit: r253002 - head

[Garrett Cooper]

Why the magic number 12?

Sent from my iPhone

On Jul 7, 2013, at 1:39 PM, Alfred Perlstein <alfred at FreeBSD.org> wrote:

> Author: alfred
> Date: Sun Jul  7 20:39:11 2013
> New Revision: 253002
> URL: http://svnweb.freebsd.org/changeset/base/253002
> 
> Log:
>  Document tip on how to build all kernels quickly.
> 
> Modified:
>  head/Makefile
> 
> Modified: head/Makefile
> ==============================================================================
> --- head/Makefile    Sun Jul  7 19:58:14 2013    (r253001)
> +++ head/Makefile    Sun Jul  7 20:39:11 2013    (r253002)
> @@ -32,6 +32,12 @@
> # targets             - Print a list of supported TARGET/TARGET_ARCH pairs
> #                       for world and kernel targets.
> # toolchains          - Build a toolchain for all world and kernel targets.
> +# 
> +# "quick" way to test all kernel builds:
> +#    _jflag=`sysctl -n hw.ncpu`
> +#    _jflag=$(($_jflag * 2))
> +#    [ $_jflag -gt 12 ] && _jflag=12
> +#    make universe -DMAKE_JUST_KERNELS JFLAG=${jflag}
> #
> # This makefile is simple by design. The FreeBSD make automatically reads
> # the /usr/share/mk/sys.mk unless the -m argument is specified on the
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