With xdist: allow to decide the minimal size of chunks for the slaves

[pytestbot]

Originally reported by: BitBucket: teudimundo, GitHub: teudimundo

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In a specific scenario, I would need all the tests to be run in parallel at the same time.

Unfortunately seems that at the moment each slave will be fed with chunk of a minimal size of 2 tests.

I don't know if it might work but an argument to decide the size (or the minimal size) of chunks can be given. A further possibility would be to have a new value for -n could mean to allocate the number of slaves needed to run all the chunks in parallel.

So that using

py.test -n by-chunk-size --chunk-size 1

would execute all of them in parallel.

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/738

[RonnyPfannschmidt]

Superseded by pytest-xdist issues