ICVR

The ICVR system initialization parameter specifies the default runaway task time interval in milliseconds as a decimal number.

Defining ICVR

You can define the ICVR system initialization parameter in the following ways:
  • On the PARM parameter of the EXEC PGM=DFHSIP statement
  • In the SYSIN data set of the CICS® start up job stream
  • Through the system console
  • In the DFHSIT macro

Values for ICVR

Valid values for the ICVR system initialization parameter are as follows:

ICVR={2000|number}
You can specify zero, or a number in the range 250 through 2 700 000, in multiples of 250. CICS rounds down values that are not multiples of 250. This is the RUNAWAY interval used by transactions defined with RUNAWAY=SYSTEM. See TRANSACTION resources for further information.
CICS might purge a task if it has not given up control after the RUNAWAY interval for the transaction (or ICVR if the transaction definition specified RUNAWAY=SYSTEM). If you code ICVR=0, runaway task control is inoperative for transactions specifying RUNAWAY=SYSTEM in their transaction definition (that is, tasks do not get purged if they appear to be looping). The ICVR value is independent of the ICV value, and can be less than the ICV value. CICS runaway task detection is based upon task time, that is, the interval is decremented only when the task has control of the processor.
Important: Java™ uses a modified ICVR value. For more information, see CICS task and thread management.
For information about commands that reinitialize the ICVR value, see Investigating loops that cause transactions to abend with abend code AICA.