rdisp/ROLL_SHM: Roll Buffer Size

Use

This value specifies the size of the roll buffer in 8 KB blocks.

The roll buffer functions as the cache for the roll file. For a fast change of context to occur, the roll areas of all user contexts should find space in the roll buffer (approximately 1 MB for each user). Buffered data is in the shared memory; accessing this data here is much faster than accessing a file.

Activities

The default value is platform-specific and is determined dynamically. This is the default value specified in transaction RZ11. This value should not normally be changed.