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 <alf...@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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