From owner-freebsd-questions  Mon Jun  3 14:44:20 2002
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Date: Mon, 3 Jun 2002 17:42:46 -0400
To: freebsd-questions@freebsd.org
From: Chris Pepper <pepper@reppep.com>
Subject: make -j4 becoming default?
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	<http://www.freebsd.org/handbook/makeworld.html> recommends 
-j4 for "make buildworld". I've tried using it with various ports, 
and it works with some, but prevents others (so far, bind9, net-snmp, 
and imap-uw) from building.

	Obviously, I'd like to use -j4 wherever possible, and it's 
suboptimal to try everything multi-threaded, then sometimes fail and 
manually fall back to single-threaded. Even worse, I usually forget 
-j4 for thread-safe builds, so I waste time unnecessarily.

	Are there any plans to allow a default -j setting, and 
identify certain packages as requiring single-threaded making? One 
possibility that's occurred to me is to set MAKE_THREADS=4 and leave 
MAKE_THREADED unset in /etc/defaults/make.conf.

	Multi-threadable Makefiles, including /usr/src/Makefile, 
could set MAKE_THREADED="YES", and single-threaded Makefiles 
(/usr/ports/Makefile, to start) could set MAKE_THREADED="NO". Then 
the make command could be enhanced to set -j from MAKE_THREADS if 
MAKE_THREADED is YES.

	Are there gaping holes in this idea? Is there a better method 
waiting in the wings?


						Thanks,


						Chris Pepper
-- 
Chris Pepper:               <http://www.reppep.com/~pepper/>
Rockefeller University:        <http://www.rockefeller.edu/>

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