Thanks for pushing this through Benjamin!

I understand if you're unable to attend the community sync on the 20th,
but would you be able to present this as a demo somehow? maybe via a
screencast?

MPark

On Thu, Oct 13, 2016 at 6:33 PM, Benjamin Mahler <bmah...@apache.org> wrote:

> Great to see this Benjamin!
>
> Looking forward to seeing the parallel test runner turn green, I'll help
> file tickets under the epic (I see there are a lot of test failures for
> me).
>
> Once we clear the issues and turn it green, shall we make this the default?
> I would be in favor of that.
>
> Ben
>
> On Thu, Oct 13, 2016 at 2:28 PM, Benjamin Bannier <
> benjamin.bann...@mesosphere.io> wrote:
>
> >
> > Hi,
> >
> > Since most tests in the Mesos, libprocess, and stout test suites can
> > be executed in parallel (the exception being some `ROOT` tests with
> > global side effects in Mesos), we recently added a parallel test
> > runner `support/mesos-gtest-runner.py`. This should allow to
> > potentially significantly speed up running of test suites.
> >
> > To enable automatic parallel execution of tests for test targets
> > executed during `make check`, configure Mesos with the option
> > `--enable-parallel-test-execution`. This will configure the test runner
> > to run all tests but the `ROOT` tests in parallel; `ROOT` tests will
> > be run in a separate, sequential step.
> >
> > * * *
> >
> > We use the environment variable `TEST_DRIVER` to drive parallel test
> > execution. By setting this variable to an empty string you can
> > temporarily disable configured parallel execution, e.g.,
> >
> >     % make check TEST_DRIVER=
> >
> > By setting this environment variable you have control over the test
> > runner itself and its arguments, even without enabling parallel test
> > during `./configure` time. Be aware that many `ROOT` tests cannot be
> > run in parallel.
> >
> >
> > The current settings oversubscribe the machine by running `#cores*1.5`
> > parallel jobs. This was driven by the observation that currently our
> > tests by and large do not make extended use of even a single core.
> > The number of parallel jobs can by controlled with the `-j` flag of
> > the test runner.
> >
> > Since making more use of the machine will likely increase machine load
> > during test execution, running tests in parallel might expose test
> > flakiness. Tests might also fail to run in parallel if testcases e.g.,
> > write data to hardcoded locations or use hardcoded ports. Please file
> > JIRA tickets for such tests if they do not yet exist.
> >
> >
> > There is still some work needed to improve reporting from parallel
> > tests. We currently use a very silent mode if tests are running
> > without failures, and just report the logs of failed jobs in case of
> > failure. MESOS-6387 sketches out possible future improvements in this
> > area.
> >
> >
> > Happy testing,
> >
> > Benjamin with help from Kevin & Till
> >
> >
>

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