inconsistent test behavior

[hndgzkn]

Inconsistent behavior in test_stopping_criterion.

on main branch(799f3fe) (version with reusable workers)

• When no network interface set:

  • runs for both1d and 2d values
  • if 1d value is commented out, test with 2d value hangs

• When virtual network interfaces are exluded or single network interface set:

  • runs for both 1d and 2d values

on #38 (removes reusable workers)

• When no network interface set:

  • runs for 1d value, but fails for 2d (1d value is not commented out)

• When virtual network interfaces are exluded or single network interface set:

  • runs for both 1d and 2d values

We think that removing the reusable workers reveals a hidden bug. However it is still unclear why virtual network interfaces prevent it from working in the case the test mpi workers are running on the local machine.