[users at bb.net] buildbot queuing mechanism

[Roman Klain]

Hello,

We use buildbot to build and test firmware of Linux based devices.

In our setup we have 1 master and 8 buildbot workers.

Our main builder calls to other builders to build dependent libraries.
Due to resource constraints we cannot allow running more than 2 builds at
once on any of buildbot workers and on the other hand we must allow at
least two builds because of nested builders i.e. one builder calls to
another.

Having such setup we get into lock situation when two main builders started
(called by CI scheduler) on the buildbot worker since the worker cannot be
assigned to any other library builder.

Is there a way we can take advantage of buildbot queuing mechanism in our
setup or change the setup to allow it?

Thanks
    Roman

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