[OE-core] [PATCH 1/1] cmake-native: Set --parallel for configure

[Burton, Ross]

On Thu, 20 Dec 2018 at 12:16, Burton, Ross <ross.burton at intel.com> wrote:
> I see similar wins here, walltime for cmake-native's build goes from
> five minutes to one minute.

For anyone playing along at home, this is what I did:

Cleaned tmp, applied patch to the mut branch.

$ git checkout HEAD^; bitbake cmake-native -C unpack
$ git checkout mut ; bitbake cmake-native -C unpack

Force a full build of cmake-native for both commits.

Then use buildstats-diff to compare the runs:

$ buildstats-diff /data/poky-tmp/master/buildstats/*
  PKG             TASK          ABSDIFF  RELDIFF  CPUTIME1 -> CPUTIME2
  cmake-native    do_configure    29.1s   +11.0%    265.7s -> 294.8s

Cumulative cputime:
  18.0s    +2.2%    13:41.4 (821.4s) -> 13:59.3 (839.3s)

Oh, that's odd: it took *more* time to run.  But the output from my
bitbake clearly showed bitbake taking five minutes before and one
minute after.

Oh, *walltime* not *cputime*.

$ buildstats-diff /data/poky-tmp/master/buildstats/* --diff-attr walltime
  PKG             TASK          ABSDIFF  RELDIFF  WALLTIME1 -> WALLTIME2
  cmake-native    do_configure  -214.6s   -82.4%     260.4s -> 45.8s

Cumulative walltime:
  -218.4s    -72.3%    05:02.1 (302.1s) -> 01:23.7 (83.7s)

cputime is generally a more useful metric during a build, but for
isolated tests like this walltime is also relevant. This is
demonstrating that the same work is happening, but in parallel.

Ross