A few theoretical questions:
When running 2 ethminers as two separate processes on same system each with different value for option --opencl-device do they share the same DAG?
Say, when a new epoch triggers regeneration of DAG - will these two processes share the same DAG or each will start working on its own version?
Can they create conflicts?
If conflicts are a possibility - is it possible specify folder for DAG generation?
I have not experienced any problem by running two processes, but would like to understand if this is a potential issue.