Make buildworld

[Brian]

Jos Chrispijn wrote:
> Can someone tell me the difference between 'make -j2 buildworld' and 
> 'make -j4 buildworld' ?
>
> Thanks,
> Jos
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fyi, the below is from /usr/src/UPDATING:

COMMON ITEMS:

        General Notes
        -------------
        Avoid using make -j when upgrading.  From time to time in the
        past there have been problems using -j with buildworld and/or
        installworld.  This is especially true when upgrading between
        "distant" versions (eg one that cross a major release boundary
        or several minor releases, or when several months have passed
        on the -current branch).