jenkins matrix + --enable-iu

[Neels Hofmeyr]

Hi list,

I've got a jenkins job ready that adds --enable-iu to the openbsc build matrix.

I'd like to verify with you guys: so far we had a build matrix of 2 x 2, so
openbsc and all its dependencies are built four times over (~22 min).
Adding --enable-iu doubles this matrix to eight times.

This means that any new commit would take about 55 min to verify with jenkins,
even if it is just a comment tweak.

I assume we want to bring this time down a bit?

I'd have these suggestions:

(1)
Just add --enable-iu, let jenkins build for hours and proliferate global
warming, and care about this once it actually bugs us.

(2)
Limit the build matrix: Only build --enable-iu once, e.g.  with --enable-smpp
and --enable-mgcp-transcoding, not with all of the other combinations. (Would
--disable-mgcp make more sense?)

(3)
Don't build all of the dependencies over and over. In pseudo sort of:

  dep_hashes = ""
  for dep in libosmo*:
    dep_hashes += "," + dep.get_current_git_hash()
    if dep.last_hashes == dep_hashes:
      dep."make install"
      continue
    dep.wipe_out()
    dep."autoreconf; configure; make check; make install"
    cat dep_hashes > "${dep.dir}/last_hashes"

That would shorten the build time substantially, and we could keep the build
matrix fully featured without taking too much time.

I've so far spent 5 minutes on implementing something like this and could
polish that up, maybe using a global dependencies workspace somewhere else on
the build slave so the separate matrix items benefit from each other.

But do we like that?  I would consider re-using previous builds safe enough for
our jenkins verifier, since all deps would be rebuilt even if only one dep's
git hash changes; assuming that it *works*, of course. Do you guys agree?


http://jenkins.osmocom.org/jenkins/job/OpenBSC-gerrit-test/
openbsc.git branches osmocom/jenkins-test and neels/speed_up_matrix_builds

Thanks for your opinions!

~Neels

-- 
- Neels Hofmeyr <nhofmeyr at sysmocom.de>          http://www.sysmocom.de/
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