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POEM_043.md

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POEM ID: 043
Title: No src_indices warning when both components are distributed
authors: markleader (Mark Leader)
Competing POEMs: 044
Related POEMs: None
Associated implementation PR: #1915

Status:

  • Active
  • Requesting decision
  • Accepted
  • Rejected
  • Integrated

Motivation

For optimization with distributed components, when src_indices are not set, a warning is printed. For example:

/usr/local/lib/python3.9/site-packages/openmdao/core/component.py:903: UserWarning:'dp' <class DistribParaboloid>: Component is distributed but input 'dp.w' was added without src_indices. Setting src_indices to np.arange(0, 1, dtype=int).reshape((1,)).
/usr/local/lib/python3.9/site-packages/openmdao/core/component.py:903: UserWarning:'dp' <class DistribParaboloid>: Component is distributed but input 'dp.x' was added without src_indices. Setting src_indices to np.arange(0, 3, dtype=int).reshape((3,)).
/usr/local/lib/python3.9/site-packages/openmdao/core/component.py:903: UserWarning:'dp' <class DistribParaboloid>: Component is distributed but input 'dp.w' was added without src_indices. Setting src_indices to np.arange(1, 2, dtype=int).reshape((1,)).
/usr/local/lib/python3.9/site-packages/openmdao/core/component.py:903: UserWarning:'dp' <class DistribParaboloid>: Component is distributed but input 'dp.x' was added without src_indices. Setting src_indices to np.arange(3, 5, dtype=int).reshape((2,)).

Description

This POEM suggests removing the warning for variables which are connected between two distributed components. I think the behavior in that case will always be clear, so there does not need to be a warning, and removing warnings in these cases will reduce both user confusion and output to the command line.

In the case of a variable which is connected between a non-distributed component and a distributed component, I think the warning is helpful to clarify that the default behavior was what the user intended.

Rejection Note:

This POEM was rejected in favor of 044, which is more general and handles all the various OpenMDAO warnings.