[libvirt PATCH] ci: Reduce number of stages

Daniel P. Berrangé berrange at redhat.com
Wed Jun 10 16:45:47 UTC 2020

On Wed, Jun 10, 2020 at 01:33:01PM +0200, Andrea Bolognani wrote:
> Right now we're dividing the jobs into three stages: prebuild, which
> includes DCO checking as well as building artifacts such as the
> website, and native_build/cross_build, which do exactly what you'd
> expect based on their names.
> This organization is nice from the logical point of view, but results
> in poor utilization of the available CI resources: in particular, the
> fact that cross_build jobs can only start after all native_build jobs
> have finished means that if even a single one of the latter takes a
> bit longer the pipeline will stall, and with native builds taking
> anywhere from less than 10 minutes to more than 20, this happens all
> the time.
> Building artifacts in a separate pipeline stage also doesn't have any
> advantages, and only delays further stages by a couple of minutes.
> The only job that really makes sense in its own stage is the DCO
> check, because it's extremely fast (less than 1 minute) and, if that
> fails, we can avoid kicking off all other jobs.
> Reducing the number of stages results in significant speedups:
> specifically, going from three stages to two stages reduces the
> overall completion time for a full CI pipeline from ~45 minutes[1]
> to ~30 minutes[2].
> [1] https://gitlab.com/abologna/libvirt/-/pipelines/154751893
> [2] https://gitlab.com/abologna/libvirt/-/pipelines/154771173
> Signed-off-by: Andrea Bolognani <abologna at redhat.com>
> ---
>  .gitlab-ci.yml | 19 +++++++++----------
>  1 file changed, 9 insertions(+), 10 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange at redhat.com>

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