Concurrent
Options governing concurrent solver execution (parallel random restarts, solver portfolios).
Parameters
the maximum number of members running at the same time; null (the default) uses the smaller of the member count and the available processors. Must be positive when specified.
the size of the sub-stream tape block reserved for each member: member k's simulation streams start at sub-stream index k times this value, so members draw from non-overlapping tape regions regardless of scheduling. Sub-stream positioning is a constant-time jump, so a generous default costs nothing. A member consumes roughly (its evaluations times its replications per evaluation) sub-streams; the default of one million comfortably exceeds realistic runs, and the pooled evaluator factory logs a warning if a member overruns its block.
when non-null, a confirmation stage re-evaluates the top member solutions under common random numbers after all members complete; see ConfirmationOptions. When null (the default) the winner is picked by point estimate.