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iStrobe Online Help

SVC 063

SVC 063 is a Type 4 SVC issued by the CHKPT (Checkpoint) macro. This macro gets LOCAL and CMS locks and calls program IGC0006C in load module IHJACP00.

Checkpoint/Restart is a method of recording information about a job at checkpoints the programmer designates, so that the job can be restarted at one of these points if a failure is detected.

The CHKPT macro causes the contents of the program's virtual storage area and certain system control information to be written to a dataset. If the job terminates abnormally, these records can be used to restart it.

Hints

Be aware that when you measure a job that issues MVS checkpoints with Strobe, the checkpoint macro is disabled.

Reference Sources

IBM z/OS MVS Diagnosis Reference

IBM z/OS DFSMS Checkpoint/Restart

IBM z/OS MVS Programming Assembler Services Guide

IBM z/OS MVS Programming Assembler Services Reference Vol. 1