cvs commit: src/usr.bin/make job.c job.h main.c make.c
John-Mark Gurney
gurney_j at resnet.uoregon.edu
Fri Nov 12 10:29:00 GMT 2004
Poul-Henning Kamp wrote this message on Fri, Nov 12, 2004 at 09:59 +0100:
> Please see:
>
> http://phk.freebsd.dk/misc/make.png
>
> It shows the loadaverage for "make -j 12 -s buildworld" with and without
> this code.
Thanks for doing this! :)
Am I to guess/read from the graph that the total time to buildworld
was the same w/ and w/o?
> In message <200411120858.iAC8w7ng088956 at repoman.freebsd.org>, Poul-Henning Kamp
> writes:
> >phk 2004-11-12 08:58:07 UTC
> >
> > FreeBSD src repository
> >
> > Modified files:
> > usr.bin/make job.c job.h main.c make.c
> > Log:
> > Add code to enforce the paralleism count (-j N) for the entire tree
> > of submakes spawned during processing.
> >
> > We create a fifo and stuff one character into it for each job we are
> > allowed to run. The name of the fifo is passed to child processes
> > in the MAKE_JOBS_FIFO environment variable.
> >
> > A make which finds this variable on startup will open the fifo and
> > only spawn jobs when it managed to read a token from the fifo.
> > When the job completes a token is writen back to the fifo.
> >
> > Slave make processes get one token for free: the one their parent
> > make got in order to run them. This makes the make processes
> > themselves invisible in the process counts.
> >
> > The net effect is that "make -j 12 -s buildworld" will start at
> > most 12 jobs at the same time, instead of as previously up to
> > 65 jobs would get started.
> >
> > Revision Changes Path
> > 1.57 +114 -28 src/usr.bin/make/job.c
> > 1.26 +1 -1 src/usr.bin/make/job.h
> > 1.96 +2 -0 src/usr.bin/make/main.c
> > 1.25 +2 -2 src/usr.bin/make/make.c
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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