Purpose
Adds cells of main memory to a TDP for its internal use.
The ADD XMSCELLS command can be specified in the z/OS environment to increase the number of cells reserved for use by the IOMODE PC interface to transfer data between the application and TDP address spaces.
Except for a small number of cells used for specialized purposes, all cells are allocated from 31bit storage.
Syntax
where:
- CELLS
- Specification that the maximum number of cells are to be increased.
- XMSCELLS
- Specification that the number of cells reserved for use by the IOMODE PC interface are to be increased.
- cellsize
- Size, in decimal, of the cells to be added.
Range is 1 through 32760.
- number_of_cells
- Number, in decimal, of cells to be added.
Size range is 1 through any multiple of 16.
Usage Notes
The ADD CELLS and ADD XMSCELLS commands can be used to improve TDP throughput when throughput has degraded. Use the DISPLAY CELLS command to display excessive GETMAIN or wait counts, which can reduce TDP throughput.
Note that the size argument must specify an existing cell size. To obtain the cell size, issue the DISPLAY CELLS command. Add numberofcells to the cellsize cell pool by issuing the ADD command.
XMSCELLS are used in z/OS only.
Example: ADD CELLS/XMSCELLS
ADD CELLS SIZ 80 NUM 16
Completion Message
TDP0527 16 MEMORY CELLS OF SIZE 80 SUCCESSFULLY ADDED