The CLP Procedure

Macro Variable _ORCLP_

The CLP procedure defines a macro variable named _ORCLP_. This variable contains a character string that indicates the status of the CLP procedure upon termination. The various terms of the macro variable are interpreted as follows.

STATUS

indicates the procedure status at termination. It can take one of the following values:

OK: The procedure terminated successfully.
DATA_ERROR: An input data error occurred.
IO_ERROR: A problem in reading or writing data occurred.
MEMORY_ERROR: Insufficient memory is allocated to the procedure.
SEMANTIC_ERROR: The use of semantic action is incorrect.
SYNTAX_ERROR: The use of syntax is incorrect.
ERROR: The status cannot be classified into any of the preceding categories.

If PROC CLP terminates normally or if an I/O error is detected while the procedure is closing a data set, the following terms are added to the macro variable.

SOLUTION_STATUS

indicates the solution status at termination. It can take one of the following values:

ALL_SOLUTIONS: All solutions are found.
INFEASIBLE: The problem is infeasible.
OPTIMAL: The solution is optimal.
SOLN_LIMIT_REACHED: The required number of solutions specified with the MAXSOLNS= option is reached.
TIME_LIMIT_REACHED: The execution time limit specified with the MAXTIME= option is reached.
RESTART_LIMIT_REACHED: The number of restarts specified with the RESTARTS= option is reached.
EVALUATION_COMPLETE: The evaluation process is finished. This solution status appears only when the EVALACTSEL= option or the EVALVARSEL= option is specified.
ABORT: The procedure is stopped by the user before any other stopping criterion is reached.

SOLUTIONS_FOUND

indicates the number of solutions that are found. This term is not applicable if SOLUTION_STATUS=INFEASIBLE.

MIN_MAKESPAN

indicates the minimal makespan of the solutions that are found. The makespan is the maximum of the activity finish times or the completion time of the last job to leave the system. This term is applicable only to scheduling problems that have at least one solution.

SOLUTION_TIME

indicates the time taken to solve the problem. By default, the time reported is CPU time; see the TIMETYPE= option for more information.

VARSELTYPE

indicates the fastest variable selection strategy. This term appears only when the EVALVARSEL= option is active and either at least one solution is found or the problem is found to be infeasible.

ACTSELTYPE

indicates the fastest activity selection strategy. This term appears only when the EVALACTSEL= option is active and at least one solution is found.

OBJECTIVE

indicates the objective value. This term appears only when an objective function is specified and at least one solution is found.

Last updated: September 16, 2021