On Sat, Oct 12, 2013 at 7:01 PM, Frank Heckenbach
<f.heckenb...@fh-soft.de> wrote:
> - My suggestion relies on the order the jobs are *started* (which,
> as I said, ought to be deterministic and the same as with "-j0",
> though Paul should know this better than me).
Maybe you're talking about some restricted subcase, but *IN GENERAL*,
the order in which jobs are started by make when running with -jN is
dependent on how long it takes to execute the subjobs.
Trivial example:
all: a b
a: a1.o a2.o
${LINK.c} -o $@ $^
b: b1.o b2.o
${LINK.c} -o $@ $^
Let's say building a1.o takes 1.5 second, but the others each takes 1 second.
Then the start order when you do "make -j2 all" will be:
a1.o a2.o b1.o a b2.o b
If building a1.o takes 2.5 second then the order will be:
a1.o a2.o b1.o b2.o a b
If building a1.o takes 3.5 second then the order will be:
a1.o a2.o b1.o b2.o b a
Without -j, the order will always be
a1.o a2.o a b1.o b2.o b
Philip Guenther
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