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Commit f815a12b authored by Mark OLESEN's avatar Mark OLESEN
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BUG: error with empty distributed roots specification (fixes #2196)

- previously used the size of distributed roots to transmit if the
  case was running in distributed mode, but this behaves rather poorly
  with bad input. Specifically, the following questionable setup:

      distributed true;
      roots ( /*none*/ );

  Now transmit the ParRunControl distributed() value instead,
  and also emit a gentle warning for the user:

      WARNING: running distributed but did not specify roots!
parent 4e6e7d59
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