svn commit: r253002 - head

[Alfred Perlstein]

On 7/7/13 2:01 PM, Garrett Cooper wrote:
> Why the magic number 12?

Numbers higher seem to result in worse performance as reported by some 
members of my team.

-Alfred

>
> 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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