System Startup, Configuration, and Shutdown Reference Manual (32650-90892)

Chapter 7 157
Modifying Miscellaneous Configuration Elements
Setting Sizes of Native Mode and Compatibility Mode Stacks
Setting Sizes of Native Mode and Compatibility Mode
Stacks
The STACK command (abbreviated ST) configures the default sizes of the NM and CM
stacks and the heap. STACK has the following parameters:
STACK (ST) [NM = default nm stack size ]
[MAXNM = max size of nm stack size ]
[CM = default cm stack size ]
[MAXCM = max size of cm stack ]
[HEAP = default nm heap-size ]
[MAXHEAP = max size of nm heap ]
NM sets the default NM stack size, which is expressed in bytes. The NM value must be less
than the values of MAXNM.
MAXNM sets the maximum NM stack size, which is expressed in bytes.
CM sets the default CM stack size, which is expressed in words (16 bits in length). The
value set for the
CM parameter must be less than the value set for the MAXCM parameter.
MAXCM sets the maximum allowable CM stack size.
HEAP sets the default heap size, which is expressed in bytes. The value must not exceed
MAXHEAP.
MAXHEAP sets the maximum heap size, which is expressed in bytes.
To change one of the
STACK parameters, enter the STACK command and at least one
parameter to change. Here are two examples. The first is keyword and the second is
positional.
mi>STACK NM=262144 CM=4096
mi>STACK 262144 262144,,20000
Table 7-4. shows the minimum and maximum values of the STACK command parameters.
Table 7-4. Min. and Max. Values for STACK Parameters
Parameter Minimum Maximum
NM 262144 1068498944
MAXNM 262144 1068498944
CM 256 4096
MAXCM 256 31232
HEAP 524288 1068498944
MAXHEAP 524288 1068498944